# US 2017/0283697 A1 · Method for producing a photo-luminescent material

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- Number: US 2017/0283697 A1
- Document ID: US20170283697A1
- Status: Published application
- Kind: A1
- Application number: 15/504,904
- Filed: 2015-08-12
- Published: 2017-10-05
- Earliest claimed: 2014-08-19
- Assignees: Aledia; Universite Blaise Pascal—Clermont II; Centre National De La Recherche Scientifique; Sigma Clermont
- Applicants: Aledia; Universite Blaise Pascal-Clermont II; Centre National de la Recherche Scientifique; Sigma Clermont
- Inventors: Abdelhay Aboulaich; Geneviève Chadeyron; Rachid Mahiou
- Web page: https://patentgrep.com/patent/US20170283697A1

## CPC

- C09K 11/7774: {Aluminates}
- C04B 35/505: based on yttrium oxide
- C04B 35/624: Sol-gel processing
- C04B 35/62645: {Thermal treatment of powders or mixtures thereof other than sintering}
- C04B 35/62695: {Granulation or pelletising (devices for shaping artificial aggregates from ceramic mixtures B28B1/004)}
- C09K 11/7721: {Aluminates}
- C04B 2235/95: Products characterised by their size, e.g. microceramics
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A method for producing a photo-luminescent material, including the following steps: (1) producing, according to a sol-gel method, a sol and then a gel of first precursors of a first substance from the sol; (2) crushing the gel; (3) optionally, annealing the gel in order to form first particles of the first substance of which the average size is between 1 pm and 20 um; (4) producing a colloidal dispersion of second particles of a second substance, different from the first substance or identical to the first substance, of which the average size is between 5 nm and 400 nm; (5) mixing the colloidal dispersion with the sol in step (1) before forming the gel or with the first particles after step (3); and (6) annealing the mixture obtained in step (5), resulting in an increase in the compactness of the mixture, the average size of the second particles after annealing being between 100 nm and 900 nm. A photo-luminescent material including a mixture of first particles of a first photo-luminescent substance of which the average size is between 1 pm and 20 pm and second particles of a second photo-luminescent substance, different from the first photo-luminescent substance or identical to the first photo-luminescent substance, of which the average size is between 100 nm and 900 nm.

## Claims

### Claim 1

A method of manufacturing a photoluminescent material,
comprising the steps of:
(1) manufacturing according to a sol-gel method a sol and then a gel of first precursors of a first substance from the sol;
(2) grinding the gel;
(3) possibly, annealing the gel to form first particles of the first substance having an average size in the range from 1 μm to 20 μm;
(4) manufacturing a colloidal dispersion of second particles of a second substance, different from the first substance or identical to the first substance, having an average size in the range from 5 nm to 400 nm;
(5) mixing the colloidal dispersion with the sol at step (1) before the forming of the gel or with the first particles after step (3); and
(6) annealing the mixture obtained at step (5), which results in an increase in the compactness of the mixture, the average size of the second particles after anneal being in the range from 100 nm to 900 nm.

### Claim 2 (depends on 1)

The method of claim 1, wherein the anneal step at step (6) is carried out at a temperature in the range from 1,100° C. to 1,700° C.

### Claim 3 (depends on 1)

The method of claim 1, wherein step (4) comprises a step of solvothermal synthesis of the second particles.

### Claim 4 (depends on 1)

The method of claim 1, wherein the colloidal dispersion is in a solvent comprising at least one alcohol.

### Claim 5 (depends on 1)

The method of claim 1, wherein the first photoluminescent substance and the second photoluminescent substance each mainly comprise an yttrium aluminum oxide.

### Claim 6 (depends on 5)

The method of claim 5, wherein the first photo-luminescent substance and the second photoluminescent substance each mainly comprise an yttrium aluminum oxide further containing at least one of the following elements: cerium, europium, chromium, neodymium, terbium, dysprosium, praseodymium, or gadolinium.

### Claim 7 (depends on 1)

The method of claim 1, wherein the mass ratio of the first particles and of the second particles is in the range from 0.01 to 99.

### Claim 8 (depends on 1)

The method of claim 1, wherein the first photoluminescent substance comprises YAG:Ce particles and the second photoluminescent substance comprises YAG:Ce nanoparticles prepared by solvothermal method.