Sarnoff Corporation

Lightscape Materials, Inc.

Stanley Electric Co., Ltd

Perry Niel Yocom

Yongchi Tian

Diane Zaremba

Olga Zakharov

Alison Sides

Liyou Yang

Herschel Clement Burstyn

Alan C Thomas

Gerard Frederickson

Leon Shapiro

Sawsan Aziz

The present invention relates to certain metal silicate halide (halosilicate) phosphors, the phosphors with an oxide coating, methods of making the phosphors, and light emitting diode- (LED-) based lighting devices modified with the phosphors.

Metal silicate halide phosphors and LED lighting devices using the same

Disclosed herein is a group of phosphors of the formulaM(SiO)(TiO)(ZrO)(HfO):A,Sand light emitting devices which utilize these phosphors.

Silicate-based phosphors and LED lighting devices using the same

Provided among other things is a phosphor of the formulaSrCaGaS:Eu:xGaS&#x2003;&#x2003;(I)wherein x is 0 to about 0.2 (or about 0.0001 to about 0.2), wherein x3 is 0.0001 to 1, and wherein a minor part of the europium component is substituted with praseodymium in an efficiency enhancing amount.

Efficient, green-emitting phosphors, and combinations with red-emitting phosphors

The present invention provides a light emitting device comprising: a light output; a light source that produces light having a wavelengths of 530 nm or less; and a wavelength transformer located between the light source and the light output, where the wavelength transformer comprises SrCaGaS: yEu&#xb7;zGaS, where x is 0.0001 to 1, y is a value defining sufficient Euto provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of SrCaGaS, and where the wavelength transformer effectively increases the light at the light output, the light having a wavelength between 535 nm and 560 nm.

Methods and devices using high efficiency alkaline earth metal thiogallate-based phosphors

Provided, among other things, is a strontium calcium thiogallate phosphor doped with divalent europium, and having the following formula:SrCaGaS:yEu.zGaS,where x is 0.0001 to 1, y is a value defining sufficient Euto provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of SrCaGaS:yEu.

High efficiency alkaline earth metal thiogallate-based phosphors

Provided among other things is a method of forming a phosphor of the formulaSrGaS:Eu:xGaS&#x2003;&#x2003;(I)wherein x is 0.0001 to 0.2, wherein a minor part of the europium component may be substituted with praseodymium in an efficiency enhancing amount, and wherein the median grain size of the phosphor composition is from 2 to 12 microns, the method comprising:

Efficient, size-selected green-emitting phosphors

A retractable screen system suitable for portable, hand held computing and communication units joins a number of optical sheets to form a rollable, extendible and retractable projection sheet. The resulting folded optical system provides a lightweight, portable unit. Telescoping arms allow the screen to be extended and stowed quickly and easily. High screen resolution is afforded by multiple mechanisms that scan concurrently. Beam indexing of the screen permits the precise alignment via feedback, and an embodiment fit for military, command and control applications.

Retractable rear projection display

A method of forming high efficiency emission alkali metal activated gallium sulfide phosphors by including an excess of 1-7% of gallium. A solution of a soluble gallium salt is added to a sulfate precipitate of an alkali metal sulfate and firing in hydrogen sulfide atmosphere at temperatures up to about 900&deg; C.

Preparation of high emission efficiency alkaline earth metal thiogallate phosphors

Long persistence phosphors based on strontium sulfide and activated with a divalent rare earth such as europium and a trivalent rare earth that does not change valence in a strontium sulfide host, and including oxygen and a halide, have long persistence and emit in the red-to-orange colors of the spectrum.

Long persistence red phosphors and method of making

A long persistence, orange-red emitting phosphor has the formula AS:Eu Tr O X wherein A is an alkaline earth metal ion, Tr is one or more trivalent rare earth metal ions, X is a halide, m is an integer in the range 0.01 to 0.5 atomic percent, n is an integer in the range 0.3 to 0.5 atomic percent, x is an integer in the range 0.01 to 2.0 atomic percent, and y is an integer in the range 0.01 to 0.5 atomic percent. These phosphors are made by reacting an alkaline earth metal sulfate to form the corresponding sulfide, mixing with europium oxide and one or more trivalent rare earth metal oxides to dope the sulfate, mixing the doped alkaline earth metal sulfate with a hydrocarbon and powdered sulfur, heating to form the corresponding phosphor sulfide and mixing with a halide compound to form the corresponding oxyhalide sulfide phosphor. The persistence time of the phosphors can be improved by grinding the phosphor and refiring it in the presence of an ammonium halide.

Long persistence alkaline earth sulfide phosphors

An adherent, transparent moisture barrier is applied to alkaline earth sulfide phosphor particles by stirring in an anhydrous polar solvent including a fluorinating compound present in a concentration of no higher than 0.02 molar until a transparent fluorine-containing moisture-impervious coating has been applied to the particles. The polar solvent is removed and the coated particles dried. A second moisture barrier can also be applied to ensure long term resistance of the phosphors to degradation by moisture.

Coated moisture impervious red phosphors

Long persistence red phosphors of alkaline earth metal phosphates, alkaline earth magnesium silicates and alkaline earth magnesium di-silicates are doubly activated with europium and manganese and contain a trivalent or quadrivalent thermal trapping agent. The thermal trapping cation feeds thermal energy to the europium ion which in turn feeds the energy to the manganese ion that emits in the red region of the spectrum.

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Washington Crossing, PA, United States of America

Perry Niel Yocom