# US 9,006,767 B2 · Luminophore composition for UV-visible light conversion and light converter obtained therefrom

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- Number: US 9,006,767 B2
- Document ID: US9006767B2
- Status: Granted
- Kind: B2
- Application number: 13/996,775
- Filed: 2011-12-23
- Published: 2014-02-13
- Granted: 2015-04-14
- Earliest claimed: 2010-12-23
- Assignees: Centre National de la Recherche Scientifique (CNRS)
- Applicants: Alain Ibanez; Vinicius Ferraz Guimaraes; Lauro June Queiroz Mala; Antonio Carles Hernandes
- Inventors: Alain Ibanez; Vinicius Ferraz Guimaraes; Lauro June Queiroz Mala; Antonio Carles Hernandes
- Web page: https://patentgrep.com/patent/US9006767B2

## CPC

- C09K 11/7712: {Borates}
- C03B 19/1065: {by liquid phase reactions, e.g. by means of a gel phase}
- C03C 4/12: for luminescent glass; for fluorescent glass
- C03C 12/00: Powdered glass (C03C8/02 takes precedence); Bead compositions
- H10H 20/8512: {Wavelength conversion materials}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A luminophore composition comprising amorphous aluminoborate powders is disclosed. The composition is obtainable by preparing an aluminoborate resin by a wet chemical route based on precursors solutions substantially free from monovalent and divalent cations; drying the resin to obtain a solid; grinding the solid to obtain a powder; pyrolyzing the powder at a pyrolysis temperature lower than the crystallization temperature of the composition; and calcinating the powder so pyrolyzed at a calcination temperature lower than the crystallization temperature of the composition. Furthermore, a process for the preparation of said composition is disclosed. The composition is particularly suitable for use in solid-state lighting, and for example for converting UV light into warm white visible light.

## Claims

### Claim 1

A luminophore composition comprising amorphous aluminoborate powders, the composition being obtainable by:
preparing an aluminoborate resin by a wet chemical route based on precursors solutions substantially free from monovalent and divalent cations;
drying the resin to obtain a solid;
grinding the solid to obtain a powder;
pyrolyzing the powder at a pyrolysis temperature lower than the crystallization temperature of the composition; and
calcinating the powder so pyrolyzed at a calcination temperature lower than the crystallization temperature of the composition.

### Claim 2 (depends on 1)

The composition according to claim 1, wherein the composition has a luminescence band in a range from 350 nm to 750 nm.

### Claim 3 (depends on 1)

The composition according to claim 1, wherein the aluminoborate has the following composition:
xM2O3+yAl2O3+zB2O3
wherein M is at least one trivalent metal, 0≦x≦0.25, 0.1≦y≦0.7, 0.3≦z≦0.9, and x+y+z=1,
B2O3 being optionally partially substituted by a substituent selected from the group comprising: SiO2, P2O5.

### Claim 4 (depends on 1)

The composition according to claim 1, wherein the aluminoborate composition is around the stoichiometric composition of YAl3(BO3)4.

### Claim 5 (depends on 1)

The composition according to claim 1, wherein the powders have a mean particle diameter ranging from 0.01 μm to 20 μm.

### Claim 6 (depends on 1)

The composition according to claim 1, wherein the powders are glass powders having a glass transition temperature Tg from 450° C. to 1000° C.

### Claim 7 (depends on 3)

The composition according to claim 3, wherein the at least one trivalent metal is selected from the group consisting of Y3+, Bi3+, Sc3+, La3+, Gd3+ or a mixture thereof.

### Claim 8

A process for the preparation of luminophore composition comprising: preparing an aluminoborate resin by means of a wet chemical route based on precursors solutions substantially free from monovalent and divalent cations; drying the resin to obtain a solid; grinding the solid to obtain a powder; pyrolyzing the powder at a pyrolysis temperature lower than the crystallization temperature of the composition; and calcinating the powder so pyrolyzed at a calcination temperature lower than the crystallization temperature of the composition.

### Claim 9 (depends on 8)

The process according to claim 8, wherein each of drying, pyrolyzing and calcinating is performed at a heating rate comprised from 10° C./h to 60° C./h.

### Claim 10 (depends on 8)

The process according to claim 8, wherein drying is performed under air or inert atmosphere.

### Claim 11 (depends on 8)

The process according to claim 8, wherein pyrolyzing is performed under inert atmosphere.

### Claim 12 (depends on 8)

The process according to claim 8, wherein pyrolyzing is performed at a temperature from 450° C. to 1000° C.

### Claim 13 (depends on 8)

The process according to claim 8, wherein calcinating is performed under oxygen atmosphere.

### Claim 14 (depends on 8)

The process according to claim 8, wherein calcinating is performed at a temperature from 450° C. to 850° C.

### Claim 15 (depends on 8)

The process according to claim 8, wherein each of the precursors' solutions comprises less than 5000 ppm of monovalent and divalent cations.

### Claim 16 (depends on 1)

Use of a composition according to claim 1 to prepare a solid-state UV-visible light converter.

### Claim 17 (depends on 1)

A solid-state UV-visible light converter comprising a composition according to claim 1.

### Claim 18 (depends on 17)

The converter according to claim 17, wherein the visible light is a white light having a color temperature from 4000 K to 5000 K.

### Claim 19 (depends on 17)

A solid-state lighting device, comprising:
an UV emitter; and
a converter according to claim 17.

### Claim 20 (depends on 19)

The lighting device according to claim 19, wherein the emitter is an UV-emitting diode (LED).