Einzeltreffer — DigiBib

A crystalline phosphor of formula: Lnx.(1−t1−t2−t3−t4)Ybx.t1Erx.t2Tmx.t3Hox.14BayZnzO1.5x+y+z in which: Ln is Y, Gd or La; t1+t2+t3+t4 varies from 0.001 to 0.3; and such that, when x=2, y=1 and z=1: t1+t3+t4 is nonzero; if Ln is La or Gd and if t3+t4 is zero, then t1 varies from 0.05 to 0.1 and t2 varies from 0.02 to 0.07; and if Ln is Gd, then t2+t4 is nonzero.

Titel:	LUMINESCENT COMPOUNDS
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2013
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20130043406 Publication Date: February 21, 2013 Appl. No: 13/579336 Application Filed: February 14, 2011 Assignees: Cambridge Enterprise Limited (Cambridge, GB), Saint-Gobain Glass France (Courbevoie, FR) Claim: 1. A crystalline phosphor of formula: Lnx.(1−t1−t2−t3−t4)Ybx.t1Erx.t2Tmx.t3Hox.t4BayZnzO1.5x+y+z in which: Ln is Y or Gd; t1+t2+t3+t4 varies from 0.001 to 0.3; and such that, when x=2, y=1 and z=1: t1+t3+t4 is nonzero; if Ln is Gd and if t3+t4 is zero, then t1 varies from 0.05 to 0.1 and t2 varies from 0.02 to 0.07; and if Ln is Gd, then t2+t4 is nonzero. Claim: 2. The phosphor as claimed in claim 1, wherein x=2, y=1 and z=1. Claim: 3. The phosphor as claimed in claim 1, wherein x=8, y=5 and z=4 or x=2, y=2 and z=8. Claim: 4. The phosphor as claimed in claim 1, wherein: t3+t4 is zero; t1 varies from 0.05 to 0.1; and t2 varies from 0.02 to 0.07. Claim: 5. The phosphor as claimed in claim 1, wherein: Ln is Y; t2+t4 is zero; and t1 and t3 are nonzero, t1 varying from 0.05 to 0.2 and t3 varying from 0.001 to 0.05. Claim: 6. The phosphor as claimed in claim 1, wherein: t2+t3 is zero; and t1 and t4 are nonzero, t1 varying from 0.06 to 0.12 and t4 varying from 0.001 to 0.02. Claim: 7. The phosphor as claimed in claim 1, wherein t1, t2 and t3 are nonzero. Claim: 8. A blend of at least two different phosphors as claimed in claim 1. Claim: 9. The blend as claimed in claim 8, comprising a first phosphor such that t3+t4=0 and t1 and t2 are nonzero and a second phosphor such that t2+t4=0 and t1 and t3 are nonzero. Claim: 10. A process for obtaining the phosphor as claimed in claim 1, comprising blending powders, milling the blend and heating the blend so as to make the powders react chemically with one another. Claim: 11. A process for obtaining the phosphor as claimed in claim 1, comprising dissolving precursors in water or in a predominantly aqueous solvent, adding a complexing agent and optionally a crosslinking agent so as to obtain a gel, and heating the resulting gel at a temperature of at least 1000° C. Claim: 12. A substrate coated over at least part of a face thereof with a coating incorporating a phosphor as claimed in claim 1. Claim: 13. A display device or a photovoltaic energy production device comprising a substrate as claimed in claim 12. Claim: 14. A method comprising converting infrared radiation into visible radiation with a phosphor as claimed in claim 1. Claim: 15. The phosphor as claimed in claim 1, wherein t1+t2+t3+t4 varies from 0.01 to 0.2. Claim: 16. The phosphor as claimed in claim 4, wherein t1 varies from 0.07 to 0.09, and t2 varies from 0.03 to 0.04. Claim: 17. The process as claimed in claim 11, wherein the precursors include nitrates, acetates or carbonates, and wherein the complexing agent includes an α-hydroxycarboxylic acid and the optional crosslinking agent includes a polyhydroxyalcohol. Claim: 18. The process as claimed in claim 17, wherein the α-hydroxycarboxylic acid is citric acid. Claim: 19. The process as claimed in claim 17, wherein the polyhydroxyalcohol is ethylene glycol. Claim: 20. The method as claimed in claim 14, wherein the infrared radiation having a wavelength in a range from 890 to 1100 nm is converted into radiation having a wavelength of about 550 nm and/or 660 nm and/or 480 nm and/or 800 nm. Claim: 21. The method as claimed in claim 20, wherein the infrared radiation has a wavelength of about 975 nm. Current U.S. Class: 2504/591 Current International Class: 09; 21

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LUMINESCENT COMPOUNDS