Abstract: A phosphor comprises an oxide that comprises: (a) at least an element selected from the group consisting of phosphorus and boron; (b) at least a metal selected from the group consisting of elements of Group IIIA, elements of Group IVA, and elements of the lanthanide series; which oxide is co-activated with Ce3+ and Tb3+. In one embodiment, a phosphor comprises lanthanum and gadolinium phosphate and/or borate co-activated with cerium and terbium. A phosphor of the present invention has low emission of UV radiation having wavelengths longer than about 250 nm, thus efficiently uses exciting UV having shorter wavelengths. The phosphor is used in light source that comprises a UV radiation source to convert efficiently UV radiation to visible light.

Abstract: A phosphor comprises a borate of terbium, at least an alkaline-earth metal, and at least a Group-3 metal. In one embodiment, the phosphor has a formula of A3(D1-xTbx)3(BO3)5; wherein A is at least an alkaline-earth metal selected from the group consisting of calcium, barium, strontium, and magnesium; D is at least a Group-3 metal selected from the group consisting of lanthanum, scandium, and yttrium; and 0<x<0.5. The phosphor can be used in light sources such as those based on mercury discharge or light-emitting diodes and in displays.

Abstract: A phosphor comprises europium, at least two alkaline-earth metals, and at least a Group-13 metal. In one embodiment, the phosphor has a formula selected from the group consisting of Sr4-a-zAaEuzD12O22 and Sr4-a-zAaEuzD14O25; wherein A is at least an alkaline-earth metal other than strontium; D is an element selected from the group consisting of Group-13 metals, group-3 metals, and rare-earth metals; 0<a<4; 0.001<z<0.3; and 4-a-z>0. The phosphor can be used in light sources and displays.

Abstract: An electron emissive composition comprises a barium tantalate composition in an amount of about 50 to about 95 wt %; and a ferroelectric oxide composition in an amount of about 5 to about 50 wt %, wherein the weight percents are based on the total weight of the barium tantalate composition and the ferroelectric oxide composition. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition in an amount of about 50 to about 95 wt % with a ferroelectric oxide composition in an amount of about 5 to about 50 wt % to form an electron emissive precursor composition, wherein the weight percents are based on the total weight of the barium tantalate composition and the ferroelectric oxide composition; and sintering the composition at a temperature of about 1000° C. to about 1700° C.

Abstract: There is provided a white light illumination system. The illumination system includes a radiation source which emits either ultra-violet (UV) or x-ray radiation. The illumination system also includes a luminescent material which absorbs the UV or x-ray radiation and emits the white light. The luminescent material has composition A2?2xNa1+xExD2V3O12. A may be calcium, barium, strontium, or combinations of these three elements. E may be europium, dysprosium, samarium, thulium, or erbium, or combinations thereof. D may be magnesium or zinc, or combinations thereof. The value of x ranges from 0.01 to 0.3, inclusive.

Abstract: An electron emissive composition comprises a barium tantalate composition of the formula (Ba1?x, Cax, Srp, Dq)6(Ta1?y, Wy, Et, Fu, Gv, Caw)2O(11±?) where ? is an amount of about 0 to about ?3; and wherein D is either an alkali earth metal ion or an alkaline earth ion; E, F, and G, are alkaline earth ions and/or transition metal ion; x is an amount of up to about 0.7; y is an amount of up to about 1; p and q are amounts of up to about 0.3; and t is an amount of about 0.05 to about 0.10, u is an amount of up to about 0.5, v is an amount of up to about 0.5 and w is an amount of up to about 0.25. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition with a binder; and sintering the barium tantalate composition with the binder at a temperature of about 1000° C. to about 1700° C.

Abstract: An electron emissive composition comprises a barium tantalate composition in an amount of about 50 to about 95 wt %; and a ferroelectric oxide composition in an amount of about 5 to about 50 wt %, wherein the weight percents are based on the total weight of the barium tantalate composition and the ferroelectric oxide composition. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition in an amount of about 50 to about 95 wt % with a ferroelectric oxide composition in an amount of about 5 to about 50 wt % to form an electron emissive precursor composition, wherein the weight percents are based on the total weight of the barium tantalate composition and the ferroelectric oxide composition; and sintering the composition at a temperature of about 1000° C. to about 1700° C.

Abstract: An electron emissive composition comprises a barium tantalate composition of the formula (Ba1-x, Cax, Srp, Dq)6(Ta1-y, Wy, Et, Fu, Gv, Caw)2O(11±&dgr;) where &dgr; is an amount of about 0 to about −3; and wherein D is either an alkali earth metal ion or an alkaline earth ion; E, F, and G, are alkaline earth ions and/or transition metal ion; x is an amount of up to about 0.7; y is an amount of up to about 1; p and q are amounts of up to about 0.3; and t is an amount of about 0.05 to about 0.10, u is an amount of up to about 0.5, v is an amount of up to about 0.5 and w is an amount of up to about 0.25. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition with a binder; and sintering the barium tantalate composition with the binder at a temperature of about 1000° C. to about 1700° C.

Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.

Abstract: The invention relates to a light source comprising a phosphor composition 14 and a light emitting device 12 such as an LED or a laser diode 32. The phosphor composition 14 absorbs radiation having a first spectrum and emits radiation having a second spectrum and comprises at least one of: YBO3:Ce3+,Tb3+; BaMgAl10O17:Eu2+,Mn2+; (Sr,Ca,Ba)(Al,Ga)2S4:Eu2+; and Y3Al5O12—Ce3+; and at least one of: Y2O2S:Eu3+,Bi3+; YVO4:Eu3+,Bi3+; SrS:Eu2+; SrY2S4:Eu2+; CaLa2S4:Ce3+; and (Ca,Sr)S:Eu2+. The phosphor composition 14 and the light source 12 together can produce white light with pleasing characteristics, such as a color temperature of 3000-6500° K, a color rendering index of about 83-87, and a device luminous efficacy of about 10-20 lumens per watt.

Abstract: There is provided a white light illumination system. The illumination system includes a radiation source which emits either ultra-violet (UV) or x-ray radiation. The illumination system also includes a luminescent material which absorbs the UV or x-ray radiation and emits the white light. The luminescent material has composition A2-2xNa1+xExD2V3O12. A may be calcium, barium, strontium, or combinations of these three elements. E may be europium, dysprosium, samarium, thulium, or erbium, or combinations thereof. D may be magnesium or zinc, or combinations thereof. The value of x ranges from 0.01 to 0.3, inclusive.

Abstract: There is provided a white light illumination system. The illumination system includes a radiation source which emits either ultra-violet (UV) or x-ray radiation. The illumination system also includes a luminescent material which absorbs the UV or x-ray radiation and emits the white light. The luminescent material has composition A2−2xNa1+xExD2V3O12. A may be calcium, barium, strontium, or combinations of these three elements. E may be europium, dysprosium, samarium, thulium, or erbium, or combinations thereof. D may be magnesium or zinc, or combinations thereof. The value of x ranges from 0.01 to 0.3, inclusive.

Abstract: There is provided a halophosphate phosphor having the formula (Ca, Mg, Ba, Sr, Zn)5(PO4)3(F, Cl, Br): Sb3+, Mn2+ doped with at least one rare earth ion which has a higher charge carrier capture cross section than the phosphor lattice defects. The rare earth ion preferentially traps charge carriers and thus decreases the density of color centers. The rare earth ions are preferably trivalent ions selected from Eu3+, Sm3+, Yb3+, Tm3+, Ce3+, Tb3+ and Pr3+.

Abstract: A Y(P,V)O4:Eu3+ red emitting phosphor is doped with at least one of a trivalent rare earth ion excluding Eu and a divalent metal ion to improve the lumen maintenance of the phosphor. The preferred material is the Y(P,V)O4:Eu3+ phosphor doped with trivalent Tb3+ ions and divalent Mg2+ ions.

Abstract: There is provided an emissive mixture for cathodes of fluorescent lamps comprising a ceramic material having a formula (A1-x Cax)6 (Ta1-y Wy)2 O11+y, where A is barium or a combination of barium and strontium, 0≦x<0.5, 0≦y<1, and one of x or y is greater than zero. The ratio of lamp efficacy to number of lamp starts may be improved by optimizing the amount of Ca and W present in the ceramic material.

Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laster scintillator.

Abstract: Ca8Mg(SiO4)4Cl2:Eu2+,Mn2+ and Y2O3:Eu3+,Bi3+ are phosphors which have been sensitized to absorb ultraviolet radiation, such as from a light emitting diode, and to convert the radiation into visible light. A phosphor conversion material blend comprises Ca8Mg(SiO4)4Cl2:Eu2+,Mn2+; Y2O3:Eu3+,Bi3+, and known blue phosphors that absorb ultraviolet radiation from a LED and convert the radiation into visible bright white light. Also, a light emitting assembly comprises at least one of a red, green and blue phosphor for absorbing and converting ultraviolet radiation into visible light. A laser diode can be used to activate the phosphors to provide improved efficiency and brightness.

Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.

Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+ , Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.

Abstract: A phosphor composition absorbs ultraviolet radiation and emits a green visible light. The phosphor composition comprises at least one of: Ba2SiO4:Eu2+; Ba2MgSi2O7:Eu2+; Ba2ZnSi2O7:Eu2+; BaAl2O4:Eu2+; SrAl2O4:Eu2+; and BaMg2Al16O27:Eu2+,Mn2+. Further, when the green-light emitting phosphor is combined with appropriate red and blue phosphors in a phosphor conversion material blend, and the phosphor conversion material blend absorbs ultraviolet radiation, and emits a bright white light with high brightness and quality. The ultraviolet radiation source may comprise a semiconductor ultraviolet radiation source.