Persistent phosphorescent composite material

Patent metadata

Field	Value
Publication number	US-10196566-B2
Application number	US-201615004209-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Nov 7, 2012
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

The invention relates to a persistent phosphorescent ceramic composite material which is a sintered dense body comprising two or more phases, a first phase consisting of at least one metal oxide and a second phase consisting of a metal oxide containing at least one activating element in a reduced oxidation state. The invention furthermore relates to a method for the preparation of a phosphorescent ceramic composite material as defined in any of the previous claims, the method comprising the following steps: preparing a mixture of a metal oxide and a phosphor; fabricating a green body from the mixture; and heat treating the green body in a reducing atmosphere.

First claim

The invention claimed is:

1. A phosphorescent ceramic composite material which is a sintered dense body consisting of:
a first phase consisting of zirconia and at least one selected from the group consisting of cerium, magnesium and yttrium, and
a second phase consisting of strontium aluminate and at least one dopant selected from the group consisting of europium and dysprosium, the dopant having a reduced oxidation state,
wherein the sintered dense body is produced by sintering the first phase and the second phase under oxidizing conditions, and then sintering the first phase and the second phase under reducing conditions.

2. The phosphorescent ceramic composite material according to claim 1 , wherein the second phase is a Eu 2+ /Dy 3+ doped Sr 4 Al 14 O 25 phase.

3. The phosphorescent ceramic composite material according to claim 1 , wherein the amount of the first phase is 40 to 95% by weight and the amount of the second phase is 5 to 60% by weight, relative to the total weight of the two phases.

4. The phosphorescent ceramic composite material according to claim 1 , wherein the amount of the first phase is 50 to 95% by weight and the amount of the second phase is 5 to 50% by weight, relative to the total weight of the two phases.

5. The phosphorescent ceramic composite material according to claim 1 , wherein the amount of the first phase is 50 to 80% by weight and the amount of the second phase is 20 to 50% by weight, relative to the total weight of the two phases.

6. The phosphorescent ceramic composite material according to claim 2 , wherein the amount of the first phase is 40 to 95% by weight and the amount of the second phase is 5 to 60% by weight, relative to the total weight of the two phases.

7. The phosphorescent ceramic composite material according to claim 2 , wherein the amount of the first phase is 50 to 95% by weight and the amount of the second phase is 5 to 50% by weight, relative to the total weight of the two phases.

8. The phosphorescent ceramic composite material according to claim 3 , wherein the amount of the first phase is 50 to 80% by weight and the amount of the second phase is 20 to 50% by weight, relative to the total weight of the two phases.

9. A sintered and heat treated phosphorescent ceramic composite material consisting of, prior to sintering and heat treating, a blend of:
a first phase consisting of zirconia and at least one selected from the group consisting of cerium, magnesium and yttrium, and
a second phase consisting of strontium aluminate and at least one dopant selected from the group consisting of europium and dysprosium, the dopant having a reduced oxidation state;
wherein the blend is sintered in a first step under oxidizing conditions and then sintered in a second step under reducing conditions.

10. The sintered and heat treated phosphorescent ceramic composite material according to claim 9 , wherein the second phase is a Eu 2+ /Dy 3+ doped Sr 4 Al 14 O 25 phase.

11. The sintered and heat treated phosphorescent ceramic composite material according to claim 9 , wherein the amount of the first phase is 40 to 95% by weight and the amount of the second phase is 5 to 60% by weight, relative to the total weight of the two phases.

12. The sintered and heat treated phosphorescent ceramic composite material according to claim 9 , wherein the amount of the first phase is 50 to 95% by weight and the amount of the second phase is 5 to 50% by weight, relative to the total weight of the two phases.

13. The sintered and heat treated phosphorescent ceramic composite material according to claim 9 , wherein the amount of the first phase is 50 to 80% by weight and the amount of the second phase is 20 to 50% by weight, relative to the total weight of the two phases.

14. The sintered and heat treated phosphorescent ceramic composite material according to claim 10 , wherein the amount of the first phase is 40 to 95% by weight and the amount of the second phase is 5 to 60% by weight, relative to the total weight of the two phases.

15. The sintered and heat treated phosphorescent ceramic composite material according to claim 10 , wherein the amount of the first phase is 50 to 95% by weight and the amount of the second phase is 5 to 50% by weight, relative to the total weight of the two phases.

16. The sintered and heat treated phosphorescent ceramic composite material according to claim 10 , wherein the amount of the first phase is 50 to 80% by weight and the amount of the second phase is 20 to 50% by weight, relative to the total weight of the two phases.

Assignees

• Rolex Sa

Inventors

• Berner Detlef
• Girod Romain
• Pujol Olliver
• Rigot Isabelle

Classifications

• C04B2235/76

  Crystal structural characteristics, e.g. symmetry · CPC title

• C04B2235/3436

  Alkaline earth metal silicates, e.g. barium silicate · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B35/488

  Composites · CPC title

• C04B35/6263

  characterised by their solids loadings, i.e. the percentage of solids · CPC title