Plural Patents (Class 313/487)
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Patent number: 6724142Abstract: Fluorescent material from the class of the silicide nitrides, Sr being used as cation, and the suicide nitrides being doped with trivalent Ce.Type: GrantFiled: January 31, 2002Date of Patent: April 20, 2004Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbHInventors: Andries Ellens, Guenter Huber
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Patent number: 6717353Abstract: A device includes a semiconductor light emitting device and a wavelength-converting material comprising Sr—SiON:Eu2+. The Sr—SiON:Eu2+ wavelength-converting material absorbs light emitted by the light emitting device and emits light of a longer wavelength. The Sr—SiON:Eu2+ wavelength-converting material may be combined with other wavelength-converting materials to make white light. In some embodiments, the Sr—SiON:Eu2+ wavelength-converting layer is combined with a red-emitting wavelength-converting layer and a blue light emitting device to generate emission in colors, which are not achievable by only mixing primary and secondary wavelengths. In some embodiments, the Sr—SiON:Eu2+ wavelength-converting layer is combined with a red-emitting wavelength-converting layer, a blue-emitting wavelength-converting layer, and a UV light emitting device.Type: GrantFiled: October 14, 2002Date of Patent: April 6, 2004Assignee: Lumileds Lighting U.S., LLCInventors: Gerd O. Mueller, Regina B. Mueller-Mach, Peter J. Schmidt, Thomas Jüstel, Gerry Sorce
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Publication number: 20040051440Abstract: The present invention aims to inhibit water adsorption onto the surface of a blue phosphor(blue fluorescent material), decrease luminance degradation and chromaticity shift of a phosphor, or improve discharge characteristics thereof. Used in a phosphor for a plasma display is a blue phosphor in which trivalent Eu ions substitute for part of divalent Eu ions. This substitution eliminates oxygen vacancy in the vicinity of layers containing Ba atoms (Ba—O layers) in the blue phosphor, and thus inhibits water adsorption onto the surface of the blue phosphor, decreases luminance degradation and chromaticity shift of the phosphor, or improves discharge characteristics thereof.Type: ApplicationFiled: July 3, 2003Publication date: March 18, 2004Inventors: Kazuhiko Sugimoto, Mitsuhiro Otani, Hiroyuki Kawamura, Masaki Aoki, Junichi Hibino
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Patent number: 6696782Abstract: Green-emitting phosphor having a composition formula represented by (Y1-x-aGdxMa)3-3yTb3y(Al1-zGaz)5O12, where 0<x≦1, 0≦a<1, 0<x+a≦1, 0<y<1 and 0≦z≦1 and M is at least one of Sc, Yb and La, improves emission color of phosphors of Y3(Al, Ga)5O12:Tb series, and in case that y=0.07, z=0.4 and a=0 in the foregoing composition, color y is increased with increasing Gd concentration, when Gd concentration x is changed, and the emission color becomes clear green.Type: GrantFiled: March 20, 2001Date of Patent: February 24, 2004Assignee: Hitachi, Ltd.Inventors: Shin Imamura, Masatoshi Shiiki, Hiromichi Yamada, Masaaki Komatsu
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Publication number: 20040016908Abstract: The wavelength-converting casting composition is based on a transparent epoxy casting resin with a luminous substance admixed. The composition is used in an electroluminescent component having a body that emits ultraviolet, blue or green light. An inorganic luminous substance pigment powder with luminous substance pigments is dispersed in the transparent epoxy casting resin. The luminous substance is a powder of garnets, thiogallates, aluminates, or orthosilicates doped with rare earths, and preferably Ce-doped phosphors. The luminous substance pigments have particle sizes≦20 &mgr;m and a mean grain diameter d50<5 &mgr;m.Type: ApplicationFiled: July 21, 2003Publication date: January 29, 2004Inventors: Klaus Hohn, Alexandra Debray, Peter Schlotter, Ralf Schmidt, Jurgen Schneider
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Patent number: 6683405Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue-luminescing Blue Halophosphate (BH), red-luminescing Yittrium Oxide (YOX), 2900K-luminescing Calcium Halophosphate, also referred to as Warm White Halophosphate (WW), and green-luminescing Zinc Silicate (ZS).Type: GrantFiled: June 26, 2001Date of Patent: January 27, 2004Assignee: Koninklijke Philips Electronics N.V.Inventor: Brett A. Carter
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Patent number: 6667574Abstract: The plasma display panel of the present invention has, for achieving high luminance and high reliability, a plurality of discharge spaces formed between a front panel and a back panel that are disposed to oppose each other, and phosphor layers, formed in the discharge spaces, each including phosphor particles of one of blue, red and green colors, wherein the phosphor particles of at least one of blue, red and green colors included in the phosphor layer are flake-like particles.Type: GrantFiled: November 14, 2002Date of Patent: December 23, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masaki Aoki, Hiroyuki Kado, Shigeo Suzuki, Hiroyuki Kawamura, Mitsuhiro Ohtani
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Publication number: 20030230739Abstract: Europium-activated phosphors comprise oxides of at least a rare-earth metal selected from the group consisting of gadolinium, yttrium, lanthanum, and combinations thereof and at least a Group-IIIB metal selected from the group consisting of aluminum, gallium, indium, and combinations thereof. A method for making such phosphors comprises adding at least a halide of at least one of the selected Group-IIIB metals in a starting mixture. The method further comprises firing the starting mixture in an oxygen-containing atmosphere. The phosphors produced by such a method exhibit improved absorption in the UV wavelength range and improved quantum efficiency.Type: ApplicationFiled: June 12, 2002Publication date: December 18, 2003Applicant: General Electric GRCInventors: Holly Ann Comanzo, Anant Achyut Setlur, Alok Mani Srivastava
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Patent number: 6621208Abstract: Strontium and strontium calcium aluminates and lanthanum and lanthanum magnesium borates activated with Pr3+ and Mn2+ exhibit characteristics of quantum-splitting phosphors. Improved quantum efficiency may be obtained by further doping with Gd3+. Refined rules for designing quantum-splitting phosphors include the requirement of incorporation of Gd3+ and Mn2+ in the host lattice for facilitation of energy migration.Type: GrantFiled: May 18, 2001Date of Patent: September 16, 2003Assignee: General Electric CompanyInventors: Anant Achyut Setlur, Holly Ann Comanzo, Alok Mani Srivastava
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Patent number: 6614165Abstract: The plasma display panel of the present invention has, for achieving high luminance and high reliability, a plurality of discharge spaces formed between a front panel and a back panel that are disposed to oppose each other, and phosphor layers, formed in the discharge spaces, each including phosphor particles of one of blue, red and green colors, wherein the phosphor particles of at least one of blue, red and green colors included in the phosphor layer are flake-like particles.Type: GrantFiled: May 5, 2000Date of Patent: September 2, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masaki Aoki, Hiroyuki Kado, Shigeo Suzuki, Hiroyuki Kawamura, Mitsuhiro Ohtani
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Patent number: 6613248Abstract: Strontium, calcium, strontium calcium, strontium calcium magnesium, calcium magnesium aluminates, and strontium borates activated with Pr3+ exhibit characteristics of quantum-splitting phosphors under VUV excitation. A large emission peak at about 405 nm under VUV excitation is used conveniently to identify quantum-splitting phosphors. Improvements may be achieved with addition of fluorides or boric acid as a flux during the preparation of the phosphors. It is also possible to predict improvement in quantum efficiency by observing the ratio of emission intensities at about 480 nm and about 610 nm.Type: GrantFiled: May 18, 2001Date of Patent: September 2, 2003Assignee: General Electric CompanyInventors: Anant Achyut Setlur, Alok Mani Srivastava
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Publication number: 20030155857Abstract: A fluorescent lamp (10) includes a coating (16) comprising a blue-green emitting halophosphate in combination with rare-earth phosphors, such as a red-emitting rare earth phosphor and a green-emitting rare earth phosphor. The blue-green emitting halophosphate replaces some or all of the blue-emitting rare earth phosphor conventionally used in lamps designed to have a high color rendition index (CRI). This combination of phosphors is preferably blended with a white-emitting halophosphate in a ratio of about 1:3, providing a blend which is suitable for providing a single coating layer for the lamp. The single layer coated lamp has a CRI which is comparable to that of a lamp formed with a conventional two phosphor layer coating process, without appreciably increasing the content of rare earth phosphors used.Type: ApplicationFiled: February 21, 2002Publication date: August 21, 2003Applicant: General Electric CompanyInventors: Thomas F. Soules, Jon B. Jansma
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Patent number: 6570319Abstract: A gas discharge lamp has two electrodes and a gastight, transparent lamp envelope including a filling gas containing mercury and a phosphor coating. The phosphor coating contains a perylene pigment.Type: GrantFiled: January 16, 2001Date of Patent: May 27, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Juestel, Hans Nikol, Cornelis Jojakim Jalink, Wolfgang Busselt
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Patent number: 6559598Abstract: A plasma picture screen, in particular an AC plasma picture screen with a coplanar arrangement having an enhanced luminance. A UV light emitting layer (8) is provided on the front plate (1), which comprises a glass plate (3) on which a dielectric layer (4) and a protective layer (5) are provided, or on the carrier plate (2) with the phosphor (10). The layer (8) comprises a VUV phosphor which converts the VUV light of the plasma discharge into UV light with a wavelength between 200 and 350 nm and emits this in the direction of the phosphor layer (10).Type: GrantFiled: February 28, 2001Date of Patent: May 6, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Jüstel, Hans-Helmut Bechtel, Harald Gläser, Walter Mayr, Hans Nikol
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Patent number: 6555963Abstract: Low-pressure mercury vapor discharge lamp provided with a discharge vessel (10). The discharge vessel (10) encloses a discharge space (11), provided with a filling of mercury and a rare gas, in a gastight manner. At least a part of an inner surface of the discharge vessel (10) is provided with a transparent layer (16) comprising an oxide of scandium, yttrium, or a rare earth metal (lanthanum, cerium, gadolinium, ytterbium, and/or lutetium). The discharge lamp is characterized in that the transparent layer (16) comprises a borate or a phosphate of an alkaline earth metal and/or of scandium, yttrium or a further rare earth metal. Preferably, the alkaline earth metal is calcium, strontium and/or barium. The further rare earth metal is preferably lanthanum, cerium and/or gadolinium. The oxide is preferably Y2O3 or Gd2O3. Preferably, the transparent layer (16) has a thickness of between 5 nm and 200 nm. A luminescent layer (17) is preferably provided on top of the transparent layer in the discharge vessel.Type: GrantFiled: November 9, 1999Date of Patent: April 29, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Ingrid J. M. Snijkers-Hendrickx, Volker D. Hildenbrand, Johannes H. Roes
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Patent number: 6538372Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of three phosphors, namely, Barium Magnesium Aluminate, Cerium Gadolinium Magnesium Borate, and Calcium Halophosphor.Type: GrantFiled: December 18, 2000Date of Patent: March 25, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Kelly S. Vose, Brett A. Carter, Emmanuel W. J. L. Oomen
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Patent number: 6534910Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at ends of the electric lamp. The electrodes generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A tri-phosphate layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The tri-phosphate layer has yttrium oxide, cerium magnesium aluminate, and barium-magnesium aluminate. One of the electrodes is mounted on a short mount along with a mercury capsule, while the other electrode is mounted on a long mount. The long mount has a horizontal portion and a flared portion which is near the lamp end. The horizontal portion is coated with a layer of aluminum oxide to reduce mercury consumption.Type: GrantFiled: September 6, 2000Date of Patent: March 18, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Kelly S. Vose, Emmanuel Wilhelmus Oomen
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Patent number: 6531074Abstract: A luminescent nanophase binder is provided for use in UV and VUV applications. The binder promotes adherence of phosphor coatings to lamp envelopes and emits visible light under UV and VUV excitation. In a preferred embodiment, the binder comprises SiO2 nanoparticles doped with terbium or terbium and yttrium. Preferably, the nanoparticles have a particle size of less than 50 nm.Type: GrantFiled: January 8, 2001Date of Patent: March 11, 2003Assignee: Osram Sylvania Inc.Inventors: Cathy Shaw Trumble, Mary Ann Johnson
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Patent number: 6528938Abstract: A mercury vapor discharge fluorescent lamp is provided having a single composite phosphor-containing layer. The composite layer contains both a heterogeneous mixture of halophosphors, rare earth triphosphors and colloidal alumina particles. The coating weight and relative proportion of halophosphors to triphosphors are both tunable to obtain a lamp having specific performance characteristics suitable to a particular application. The colloidal alumina particles contained in the composite layer eliminate the need for a separately applied alumina layer as is conventional in the prior art.Type: GrantFiled: October 23, 2000Date of Patent: March 4, 2003Assignee: General Electric CompanyInventor: Jon B. Jansma
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Patent number: 6525460Abstract: A high color-rendering fluorescent lamp comprising a phosphor layer wherein the phosphors are selected such that the general color rendering index, Ra is greater than 96 or 97 or 98 at color temperatures of 2700 K to 6600 K, and all the special color rendering indices are greater than 90 at color temperatures of 2900 K to 6500 K.Type: GrantFiled: August 30, 2000Date of Patent: February 25, 2003Assignee: General Electric CompanyInventors: Thomas F. Soules, Pak K. Yuet
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Patent number: 6501444Abstract: In a plasma display panel, red, green, and blue pixels have the same voltage range for write discharges. The red, the green, and the blue pixels have first, second, and third data electrodes, respectively, covered with an insulating film. A red fluorescent substance layer is formed on the insulating film over the first data electrode. A green fluorescent substance layer is formed on the insulating film over the second data electrode. A blue fluorescent substance layer is formed on the insulating film over the third data electrode. The green fluorescent substance is smaller than both of the red and the blue fluorescent substance layers in thickness.Type: GrantFiled: October 14, 1998Date of Patent: December 31, 2002Assignee: NEC CorporationInventors: Kazuaki Yanagida, Masayuki Noborio
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Publication number: 20020185963Abstract: An arrangement of spacer posts in a flat panel display. The spacer posts maintain a fixed separation between a back plate and a face plate. The back plate includes one or more electron emission sources. Phosphors or other electro-optic material are distributed among a plurality of pixel areas on the face plate. The pixel areas are arranged in distinct groups, where each group contains N adjacent pixel areas. Each pixel area includes an area free of phosphor material. Within each group of N pixel areas, the respective phosphor-free areas of the N pixel areas are contiguous so as to form a combined phosphor-free area equal to or greater than the transverse cross-section of one end of a spacer. Consequently, a spacer can be attached to the face plate at each combined phosphor-free area without disrupting the uniformity of the distribution of phosphors on the face plate.Type: ApplicationFiled: June 7, 2001Publication date: December 12, 2002Applicant: Pixtech S.AInventors: Jimmy J. Browning, David H. Wells, Jianping Yang
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Patent number: 6479936Abstract: Improved lamp of the type comprising the crystal bulb of an incandescent lamp or the crystal tube of a fluorescent lamp or preferably of the type comprised of a tube-shaped fluorescent lamp, characterized in that the structure of the tube itself forms a support for a luminescent product arranged as a coating which captures the light proceeding from a source and generated by the lamp itself thereby enabling it to emit its own light after the excitation has stopped thereby providing a self-contained lighting element.Type: GrantFiled: April 28, 2000Date of Patent: November 12, 2002Inventor: Jorge Matarrodona Martinez
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Publication number: 20020158565Abstract: Phosphor blends are disclosed that are capable of absorbing electromagnetic ation having wavelengths in the range from about 315 nm to about 480 nm. O25:Eu2+,(Sr,Ba,Ca)5(PO4)3(Cl,OH):Eu2+,(Ba,Ca,Sr)2MgAl16O27: Eu2+, and (Ba,Ca,Sr)2MgAl16O27:Eu2+,Mn2+. White light sources are obtained by lying a phosphor blend over at least one LED that is capable of emitting electromagnetic radiation in the above-noted wavelength range.Type: ApplicationFiled: April 27, 2001Publication date: October 31, 2002Inventors: Anant Achyut Setlur, Alok Mani Srivastava, Holly Ann Comanzo, Daniel Darcy Doxsee
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Patent number: 6472812Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue luminescing Blue Halophosphor (BH), red-luminescing Yittrium Oxide (YOX), 3000K-luminescing Calcium Halophosphor, also referred to as Warm White (WW) and green-luminescing Zinc Silicate (ZS).Type: GrantFiled: December 18, 2000Date of Patent: October 29, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Kelly S. Vose, Brett A. Carter, Emmanuel W. J. L. Oomen
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Patent number: 6469434Abstract: Willemite (Zn2SiO4:Mn) is doped with one or more ions selected from the group formed by Gd3+, Eu2+, Co2+, Ce3+, Pr3+, Nd3+, Sm3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+ and Yb3+. This results in a increase in absorption and quantum yield and a decrease of the decay time.Type: GrantFiled: November 10, 1999Date of Patent: October 22, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Helmut Bechtel, Thomas Jüstel, Walter Mayr, Hans Nikol, Cornelis R. Ronda
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Patent number: 6459197Abstract: A fluorescent lamp includes a phosphor layer containing a blue phosphor having an emission peak in the 440 to 470 nm wavelength range, a green phosphor having an emission peak in the 505 to 530 nm wavelength range, a green phosphor having an emission peak in the 540 to 570 nm wavelength range, and a red phosphor having an emission peak in the 600 to 670 nm wavelength range. The ratio I1/I2 of the emission peak energy I1 in the wavelength range of 505 to 530 nm to the emission peak energy I2 in the wavelength range of 540 to 570 nm is not less than 0.06. The color temperature of the lamp is not more than 3700 K.Type: GrantFiled: September 24, 1999Date of Patent: October 1, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshio Mori, Hiromi Tanaka, Toru Higashi, Kenji Mukai, Tetsuji Takeuchi
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Patent number: 6452324Abstract: A fluorescent lamp particularly adapted for illuminating food, such as in a grocery store, particularly meat. The phosphor-containing layer in the lamp has two phosphors, a broad-band red-emitting phosphor having a peak between 610 and 645 nm, and a broad-band blue-green-emitting phosphor having a peak between 465 and 495 nm. The preferred phosphors are (Sr,Mg,Ca)3(PO4)2:Sn2+ and Ca5(PO4)3F:Sb3+. The lamp also has substantially reduced UV radiation.Type: GrantFiled: August 30, 2000Date of Patent: September 17, 2002Assignee: General Electric CompanyInventors: Thomas F. Soules, Pak K. Yuet
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Patent number: 6445119Abstract: A discharge lamp which radiates visible light having the following lights combined: light having an emission peak in 400 to 490 nm wavelength range in a blue spectral region; light having an emission peak in a 500 to 550 nm wavelength range in a green spectral region; and light having an emission peak in 600 to 670 nm wavelength range in a red spectral region. The color point of the radiated light lies within a region common to the following regions: a region bounded by an ellipse with a color point (u, v)=(0.224, 0.330) as a center thereof, a major axis of 0.056, a minor axis of 0.024, and an angle from the u axis of 20 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)=(0.224, 0.330) as a center thereof, a major axis of 0.078, a minor axis of 0.014, and an angle from the u axis of 30 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)=(0.235, 0.335) as a center thereof, a major axis of 0.Type: GrantFiled: March 8, 1999Date of Patent: September 3, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshio Mori, Hiromi Tanaka, Kenji Mukai, Toru Higashi, Tetsuji Takeuchi, Haruo Shibata, Sueko Kanaya, Katsuaki Iwama
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Publication number: 20020101151Abstract: Described is a plasma switched organic photoluminescent display including lower and upper plates. The lower plate includes a transparent rear substrate, a plurality of address electrodes arranged in a first direction on the transparent rear substrate like stripes in parallel each other, a white back dielectric layer on the transparent rear substrate including the address electrodes, a plurality of barrier ribs arranged in parallel each other on the white back dielectric layer between the address electrodes in the first direction, respectively, a plurality of organic photoluminescent layers on the exposed white back dielectric layer between the barrier ribs, respectively, and a plurality of photoluminescent-layer-protecting layers on the organic photoluminescent layers, respectively.Type: ApplicationFiled: December 5, 2001Publication date: August 1, 2002Inventors: Do-Hyun Choi, Kyung-Hee Choi, Byung-Hyun Byun, Seung-Jun Yi
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Patent number: 6414426Abstract: A fluorescent lamp ensures categorical color perception for surface colors of at least red, green, blue, yellow and white, while improving the luminous efficiency in scotopic vision and mesopic vision or in a wide visual field, wherein dominant radiation is obtained from a phosphor which has peak emission wavelength in a wavelength region from 530 to 580 nm and a region from 600 to 650 nm, flux ratio of a phosphor having peak emission wavelength in a wavelength region from 420 to 530 nm is set to 4 to 40% of the total flux radiated in the dominant wavelength band, correlated color temperature of the lamp light color is set to 3500 K to ∞ and Duv (Duv=&Dgr;uv×1000, &Dgr;uv is the distance of color point from Plankian locus on the CIE 1960 uv chromaticity diagram) is set within a range from 5 to 70.Type: GrantFiled: March 23, 1999Date of Patent: July 2, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Izumi Akashi, Masanori Shimizu, Shoetsu Sakamoto
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Patent number: 6407498Abstract: The invention discloses new luminescent materials for use as UV-A phosphors in suntanning lamps. The luminescent materials are of general formula Ca3-xB2P2O11+0.5x:xCe3+ and Ca2.5-xB5.5P2O15.75+0.5x:xCe3+.Type: GrantFiled: November 10, 1999Date of Patent: June 18, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Thomas Justel, Hans Nikol, Cornelis W. A. Schetters
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Patent number: 6380669Abstract: The invention relates to a signaling lamp with VUV phosphor excitation, in particular for traffic applications. It further relates to the use of phosphor mixtures for red, green and yellow signaling lamps and to a correspondingly constructed traffic light. (FIG. 1).Type: GrantFiled: August 11, 1999Date of Patent: April 30, 2002Assignee: Patent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbHInventors: Martin Zachau, Ulrich Mueller
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Publication number: 20020011776Abstract: An electric lamp which is provided with an electric light source in a light-transmitting bulb provided with a coating comprising an inorganic colored pigment selected from the group formed by oxide nitride pigments of the general formulaType: ApplicationFiled: May 24, 2001Publication date: January 31, 2002Inventors: Joachim Opitz, Sonja Louisa Leona Ceulemans
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Publication number: 20020009613Abstract: In evaluating whiteness of light from a light source or a luminaire, whiteness W is given by the following equation,Type: ApplicationFiled: June 13, 2001Publication date: January 24, 2002Inventors: Kenji Mukai, Toshio Mori, Yoshio Manabe, Yoshinori Ootaka, Masaaki Hama
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Patent number: 6313754Abstract: An escape light instrument using as its light source a fluorescent lamp, mainly derives its luminescence from luminophors the peak ranges of whose luminescent wavelength are from 530 to 580 nm and from 600 to 650 nm, said luminophors having 30 nm or less of half band width, wherein a luminous flux derived from a luminophor the peak range of whose luminescent wavelength is from 420 to 470 nm accounts for 4 to 10% of a total luminous flux in said main luminescent wavelength, and which permits categorical discrimination of at least green and white transmitted colors used on the sign face, and has a luminous color of 5 or more in Duv.Type: GrantFiled: December 7, 1999Date of Patent: November 6, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoko Shimomura, Masanori Shimizu, Yoshinori Tanabe
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Patent number: 6312860Abstract: Disclosed are a phosphor composition comprising an inorganic phosphor, capable of emitting blue color upon ultraviolet irradiation, and copper or a copper compound; a phosphor paste comprising the phosphor composition dispersed in a dispersing medium; and a photosensitive dry film formed from the phosphor paste.Type: GrantFiled: October 14, 1998Date of Patent: November 6, 2001Assignee: Dai Nippon Printing Co., Ltd.Inventors: Naoki Gotoh, Masaaki Asano
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Publication number: 20010035710Abstract: A fluorescent lamp, wherein a chromaticity value (x, y) of a light source color is in a range surrounded by a point A (0.251, 0.343), a point B (0.285, 0.332), a point C (0.402, 0.407) and a point D (0.343, 0.433), includes a phosphor blend in an inner face of a luminous tube, the phosphor blend comprising an antimony and manganese activated calcium halophosphate phosphor, a rare earth phosphor emitting green, and a rare earth phosphor emitting blue or red.Type: ApplicationFiled: March 21, 2001Publication date: November 1, 2001Inventors: Yoko Shimomura, Masanori Shimizu, Takeshi Arakawa, Yoshinori Tanabe
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Patent number: 6222312Abstract: A fluorescent lamp includes a discharge tube with an ionizable filling which emits ultraviolet light when a discharge occurs, and an inside surface coated with a mixture of three phosphors which emit light in blue-green, green, and red wavelength ranges when exposed to the ultraviolet light. The green and red phosphors are conventional, for example LAP and YOX, while the blue-green phosphor is barium magnesium aluminate activated by europium and manganese (BBG). The BBG has spectra which are similar to those of conventional blue phosphors such as BAM or SCAP, but also emits in the green range from 500-540 nm and augments the LAP which is relatively low in this range.Type: GrantFiled: March 17, 2000Date of Patent: April 24, 2001Assignee: Philips Electronics North America Corp.Inventors: Snehasish Ghosh, Charles Trushell, Manuel Oomen
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Patent number: 6208069Abstract: A lamp vessel is made from a material which absorbs short-wave UV radiation. In addition, the luminescent screen comprises cerium-activated lunthanum phosphate and a luminescent substance having an emission band whose maximum is situated in the wavelength range from 340 nm and whose half-value ranges between 35 nm and 80 nm. The emission spectrum of the lamp for wavelengths below 400 nm corresponds closely to the solar spectrum while the lamp also has a high erythema L light output.Type: GrantFiled: December 9, 1998Date of Patent: March 27, 2001Assignee: U.S. Philips CorporationInventors: Thomas Jüstel, Hans Nikol, Cornelis R. Ronda, Dick Van Der Voort, Cornelis J. Jalink
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Patent number: 6206544Abstract: A projection illumination fixture includes luminescent light tubes lined with an emulsion coating of titanium dioxide and phosphors for producing an appropriate mixture of highly scattered red, blue and green wavelengths of sustained luminescent light emission, a reflector housing for reflecting scattered rays of emitted luminescent light toward an aperture, a catadioptric lens for collecting and redirecting luminescent light rays reaching the aperture into and through a light snoot or barrel and a large area projection (magnifying) Fresnel lens at the end of the light snoot or barrel for directing and spreading the emitted light to fill an illumination field with directional divergent light ideal for dimensionally ‘painting’ talent and objects positioned and moving within the illumination field.Type: GrantFiled: August 7, 1998Date of Patent: March 27, 2001Inventor: Paul D. Costa
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Patent number: 6197218Abstract: Photoluminescent phosphor powders and a method for making phosphor powders. The phosphor powders have a small particle size, narrow particle size distribution and are substantially spherical. The method of the invention advantageously permits the economic production of such powders. The invention also relates to improved devices, such as display devices and lighting elements, incorporating the phosphor powders.Type: GrantFiled: August 27, 1998Date of Patent: March 6, 2001Assignee: Superior MicroPowders LLCInventors: Mark J. Hampden-Smith, Toivo T. Kodas, James Caruso, Daniel J. Skamser, Quint H. Powell, Klaus Kunze
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Patent number: 6184618Abstract: The invention relates to a luminescent material of general formula (BaxSr1−x−yPby)2Mg(BO3)2 wherein 0≦x≦0.999, 0.0005<y<0.05. Luminescent materials of this general formula are very suitable for use in low pressure mercury discharge lamps for tanning purposes.Type: GrantFiled: December 4, 1998Date of Patent: February 6, 2001Assignee: U.S. Philips CorporationInventors: Thomas Jüstel, Hans Nikol, Cornelis R. Ronda, Johannes T. W. De Hair
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Patent number: 6157126Abstract: A warm white fluorescent lamp wherein the visual clarity index of said lamp is in a range from 121 to 145 inclusive, the correlated color temperature of its light color is in a range from 2700 K to 3150 K inclusive, and the chromaticity point of said light color is located within a chromaticity range where distance of chromaticity point from the Planckian locus on the CIE 1960 uv chromaticity diagram is not less than -0.005 and not greater than +0.005.Type: GrantFiled: March 11, 1998Date of Patent: December 5, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tadashi Yano, Kenjiro Hashimoto, Makoto Inohara
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Patent number: 6153971Abstract: A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 and from 600 to 650, with correlated color temperature of the lamp light color in a range from 1700 to 6500 and with DUV (distance from perfect radiator locus on UV coordinates) in a range from 0 to 70, and allows categorical perception of at least red, green, blue, yellow and white of surface colors of an illuminated object.Type: GrantFiled: June 10, 1999Date of Patent: November 28, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masanori Shimizu, Yasuhiko Yamanaka, Syouetsu Sakamoto, Tetsuji Takeuchi
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Patent number: 6144152Abstract: Color rendering indices Ra,8 between 80 and 90 and R9 greater than 20, and a color point on or near the Planckian curve, are achieved with a lamp vessel provided with a luminescent screen including a first luminescent substance which emits predominantly between 520 nm and 565 nm, a second luminescent substance which emits predominantly between 590 nm and 630 nm, and a third luminescent substance which emits predominantly in the range between 615 nm and 780 nm.Type: GrantFiled: December 9, 1998Date of Patent: November 7, 2000Assignee: U.S. Phillips CorporationInventor: Dick Van Der Voort
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Patent number: 6137217Abstract: A fluorescent lamp comprises at least one layer of a four-component phosphor blend for producing visible illumination having a white color. The quad-phosphor blend comprising a first and second red-emitting phosphor component with each red-emitting phosphor component having different visible emission spectrum principally in the 590 to 630 nm wavelength range. A third blue-emitting phosphor component has an emission spectrum principally in the 430 to 490 nm wavelength range. A fourth no-rare-earth green-emitting phosphor component has an emission spectrum principally in the 500 to 570 nm wavelength range. The relative proportions of the phosphor components are such that an enhanced color rendering index is produced as compared to tri-component blends formed from only three of the phosphor components.Type: GrantFiled: August 28, 1992Date of Patent: October 24, 2000Assignee: GTE Products CorporationInventors: Romano G. Pappalardo, Roger B. Hunt, Jr.
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Patent number: 6130511Abstract: A neon gas discharge lamp is provided which produces an acceptable amber color emission for automotive applications. The red emission from the neon discharge when the lamp is operated in a pulsed mode is combined with a green emission from a substituted Y.sub.3 Al.sub.15 O.sub.12 :Ce phosphor coated on the interior surface of the lamp. The resulting amber emission meets both SAE and ECE amber color requirements. In particular, phosphor has the general formula:Y.sub.3-(a+b+c) Ce.sub.a M.sub.b V.sub.c Al.sub.5 O.sub.12where M is Gd or La;V are lattice vacanies;0.01.ltoreq.a.ltoreq.0.08;0.60.ltoreq.b.ltoreq.2.4; and0.ltoreq.c.ltoreq.0.1.Type: GrantFiled: September 28, 1998Date of Patent: October 10, 2000Assignee: Osram Sylvania Inc.Inventors: Harold L. Rothwell, Jr., Thomas E. Peters, Jean M. Evans, Anthony F. Kasenga
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Patent number: 6069439Abstract: A method of manufacturing a phosphor material, which comprises the steps of, generating thermal plasma, supplying a conductive material into the thermal plasma so as to evaporate the conductive material, supplying phosphor particles into the thermal plasma so as to allow the conductive material to adhere onto the surface of the phosphor particles, and cooling the phosphor particles having the conductive material adhered thereon. By making use of this method, it is possible to manufacture a phosphor material comprising a phosphor particle and a conductive layer formed on the surface of the phosphor particle, wherein the ratio between the minor axis and the major axis of the phosphor material is 1.5 or less.Type: GrantFiled: March 30, 1998Date of Patent: May 30, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Miwa Okumura, Keiko Albessard
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Patent number: 6045721Abstract: A barium magnesium aluminate phosphor having improved maintenance and efficiency is provided. The novel phosphor is suitable for use in conventional fluorescent lamp applications and applications utilizing VUV excitation, including Xe excimer lamps and plasma display panels.Type: GrantFiled: December 23, 1997Date of Patent: April 4, 2000Assignee: Patent-Treuhand-Gesellschaft fur Elekrische Gluhlampen mbHInventors: Martin Zachau, Dieter Schmidt, Ulrich Mueller, Charles F. Chenot