Abstract: The invention relates to a gas discharge lamp for dielectrically impeded discharges, which gas discharge lamp is provided with a discharge vessel filled with a gas filling, which discharge vessel comprises at least a wall of a dielectric material and at least a wall having a surface which is at least partly transparent to visible radiation and coated with a phosphor layer, which phosphor layer comprises a phosphor having a host lattice, Eu2+ as the activator and a doping D selected from the group formed by Ce3+, Pr3+ and Tb3+, and provided with an electrode structure for a dielectrically impeded discharge and means for igniting and maintaining the discharge. The invention also relates to a phosphor comprising a host lattice, Eu2+ as the activator and a doping D selected from the group formed by Ce3+, Pr3+ and Tb3+.

Abstract: A gas discharge lamp fitted with a gas discharge vessel filled with a gas filling suitable for a gas discharge which emits VUV radiation, with a phosphor coating containing a downconversion phosphor and with means for igniting and maintaining a gas discharge, in which the downconversion phosphor has, in a host lattice, a pair of activators of a first lanthanoid ion and a second lanthanoid ion and a sensitizer selected from the group formed by the thallium(I) ion, lead(II) ion and bismuth(III) ion, is environmentally friendly and has a high lamp efficiency &eegr;lamp.

Abstract: The invention relates to a color picture screen with an improved blue light emission. The blue phosphor layer comprises a first blue-emitting phosphor and a second phosphor which shows a light emission in the range from 380 to 450 nm.

Abstract: The invention relates to a liquid crystal picture screen provided with a background lighting system which comprises a white light source. The light source emits white or substantially white light which is composed of more strongly saturated primary colors.

Abstract: This invention relates to a plasma picture screen provided with a phosphor layer which comprises an intrinsically pigmented phosphor. The plasma picture screen has an improved value for the luminance contrast performance without the efficiency of the phosphors being detracted from.

Abstract: A low-pressure gas discharge lamp comprising a gas discharge vessel with a gas filling containing mercury, and comprising electrodes, means for igniting and maintaining a gas discharge, and a phosphor coating containing at least one phosphor layer and a UV-C phosphor and a phosphor that can be excited by UV-C radiation.

Abstract: A low-pressure gas discharge lamp having a gas discharge vessel containing a gas filling with a chalcogenide of the elements of the 4th main group of the periodic systems of elements and a buffer gas, and having inner or outer electrodes and means for generating and maintaining a low-pressure gas discharge.

Abstract: 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.

Abstract: The invention relates to a plasma picture screen with a improved white color point. The front plate (1) of the plasma picture screen has a blue layer on the side facing the plasma discharge. This may be the dielectric layer (4), the protective layer (5), or an additional layer.

Abstract: A plasma display with a carrier plate, a transparent front plate, a ribbed structure which subdivides the space between the carrier plate and the front plate into plasma cells, which cells are filled with a gas, with one or several electrode arrays for generating corona discharges in the plasma cells, and with a phosphor layer which comprises a phosphor chosen from the group of doped europium(II)-activated barium-magnesium aluminates with the general formula Ba1−xMxMgAl10O17−0.5x:Eu with 0<x≦0.5 and M=Li, Na, K, Rb and Cs; BaMg1−yMyAl10O17−0.5y:Eu with 0<y≦0.5 and M=Li, Na, K, Rb and Cs; and BaMgAl10−zNzO17−0.5z:Eu with 0<z≦5.0 and N=Mg, Ca, Sr, Ba and Zn has an improved blue color point and color contrast. The invention also relates to a phosphor chosen from the group of doped europium(II)-activated barium-magnesium aluminates with the general formula Ba1−xMxMgAl10O17−0.5x:Eu with 0<x≦0.

Abstract: Light-emitting devices are disclosed that comprise a light source emitting first light, a first material substantially transparent to and located to receive at least a portion of the first light, and particles of a second material dispersed in the first material. The second material has an index of refraction greater than an index of refraction of the first material at a wavelength of the first light. The particles of the second material have diameters less than about this wavelength. Particles of a third material may also be dispersed in the first material.

Abstract: A liquid crystal color display screen is provided with an electro-optical medium, two parallel transparent substrates by which the electro-optical medium is flanked, a device that influences the transmission state of the electro-optical medium, and a phosphor layer having at least two phosphors on the first substrate. A radiation source emits radiation having a maximum emission at a wavelength &lgr;1 <360 nm. The radiation source is situated at the side of the second substrate. The screen also includes a UV phosphor that transforms the radiation having a maximum emission at a wavelength &lgr;1<360 nm to radiation having a maximum emission at a wavelength &lgr;2>360 nm.

Abstract: A gas discharge lamp fitted with a gas discharge vessel filled with a gas filling is suitable for a gas discharge which emits VUV radiation, with a luminophore coating containing a down conversion luminophore and with means for igniting and maintaining a gas discharge in which the down conversion luminophore has in a host lattice a pair of activators of the a first lanthanoid ion and a second lanthanoid ion and a sensitizer selected from the group of the copper (I) ion, silver (I) ion, gold (I) ion, zinc (II) ion, gallium (III) ion, indium (III) ion, thallium (III) ion, germanium (IV) ion, tin (IV) ion and lead (IV) ion, is environmentally friendly and has a high lamp efficiency &eegr;lamp.

Abstract: A plasma picture screen fitted with a phosphor layer comprising a red phosphor activated by Eu3+ shows an improved red color point (x≧0.64 and y≦0.35) and shorter decay times &tgr;1/10 as compared with the standard phosphor (Y,Gd)BO3. The phosphor according to the invention has a lattice in which the activator Eu3+ occupies a location which has no inversion symmetry.

Abstract: A plasma picture screen comprises a front plate including a glass plate on which a dielectric layer and a protective layer are provided; a carrier plate provided with a phosphor layer including a red and a blue phosphor as well as a green Tb3+-activated phosphor, with a ribbed structure which subdivides the space between the front plate and the carrier plate into gas-filled plasma cells; and a green color filter layer. One or several electrode arrays are provided on the front plate and the carrier plate for generating corona discharges in the plasma cells.

Abstract: 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.

Abstract: The invention describes a liquid crystal color picture screen with an improved luminous efficacy and an improved viewing angle. The liquid crystal color picture screen comprises a photoluminescent layer (7) which contains a dichroically absorbing color agent and an isotropically emitting color agent.

Abstract: 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).

Abstract: The invention relates to a plasma picture screen in which the luminescent materials for the generation of visible light are applied to the front plate (1) or to the front plate (1) and the carrier plate (2).

Abstract: The invention relates to a plasma picture screen with a improved white color point. The front plate (1) of the plasma picture screen has a blue layer on the side facing the plasma discharge. This may be the dielectric layer (4), the protective layer (5), or an additional layer.