# US 9,039,933 B2 · Eu2+-activated aluminates nanobelts, whiskers, and powders, methods of making the same, and uses thereof

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- Number: US 9,039,933 B2
- Document ID: US9039933B2
- Status: Granted
- Kind: B2
- Application number: 13/510,460
- Filed: 2011-02-10
- Published: 2012-12-20
- Granted: 2015-05-26
- Earliest claimed: 2010-03-01
- Assignees: University of Georgia Research Foundation, Inc.
- Applicants: Zhengwei Pan; Feng Liu; Xufan Li
- Inventors: Zhengwei Pan; Feng Liu; Xufan Li
- Web page: https://patentgrep.com/patent/US9039933B2

## CPC

- C09K 11/7734: {Aluminates}
- H10H 20/8512: {Wavelength conversion materials}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Embodiments of the present disclosure relate to visible luminescent phosphors, visible luminescent nanobelt phosphors, methods of making visible luminescent phosphors, methods of making visible luminescent nanobelt phosphors, mixtures of visible luminescent phosphors, methods of using visible luminescent phosphors, waveguides including visible luminescent phosphors, white light emitting phosphors, and the like.

## Claims

### Claim 1

A method of making a phosphor nanobelt, comprising:
mixing an amount of each of Eu2O3 and Al2O3 with an amount of either of SrO or BaO, ground with an amount of graphite powder to form a mixture; and
heating the mixture to about 1350-1550° C. for about 1-3 hours under about 1-50 Torr of flowing argon to form a phosphor nanobelt.

### Claim 2

A method of making a phosphor whisker, comprising:
mixing an amount of each of Eu2O3 and Al2O3 with an amount of either of SrO or BaO, ground with an amount of graphite powder and a catalyst selected from the group consisting of: Fe2O3, NiO, SiO2, and GeO2, to form a mixture; and
heating the mixture to about 1350-1550° C. for about 1-3 hours under about 1-50 Torr of flowing argon to form a phosphor whisker.

### Claim 3

A method of making a phosphor powder, comprising:
mixing an amount of each of Eu2O3 and Al2O3 with an amount of either of SrO or BaO, ground with an amount of graphite powder to form a mixture; and
heating the mixture alongside an amount of Al2O3 powder, to about 1350-1550° C. for about 1-3 hours under about 1-50 Torr of flowing argon to form a phosphor powder.

### Claim 4

A europium aluminate phosphor comprising:
a material including a phosphor selected from the group consisting of: a phosphor having the formula (EuO)(Al2O3)3, a phosphor having the formula (Sr0.9Eu0.1O)4(Al2O3)5, a phosphor having the formula (Ba0.99Eu0.01O)4(Al2O3)5, and a phosphor having the formula (Ba0.75Eu0.25O)4(Al2O3)5.

### Claim 5 (depends on 4)

The phosphor of claim 4, wherein when the phosphor is (EuO)(Al2O3)3, the phosphor has the characteristic that it emits intense blue light under excitation.

### Claim 6 (depends on 5)

The phosphor of claim 5, wherein the phosphor has a tetragonal crystal structure.

### Claim 7 (depends on 4)

The phosphor of claim 4, wherein when the phosphor is (EuO)4(Al2O3)5, the phosphor has the characteristic that it emits intense and broad orange light under excitation.

### Claim 8 (depends on 7)

The phosphor of claim 7, wherein the phosphor has a hexagonal crystal structure.

### Claim 9 (depends on 4)

The phosphor of claim 4, wherein when the phosphor is (Sr0.9Eu0.1O)4(Al2O3)5, the phosphor has the characteristic that it emits intense and broad yellow light under excitation.

### Claim 10 (depends on 9)

The phosphor of claim 9, wherein the phosphor has a hexagonal crystal structure.

### Claim 11 (depends on 4)

The phosphor of claim 4, wherein when the phosphor is (Ba0.99Eu0.01O)4(Al2O3)5, the phosphor has the characteristic that it emits intense and broad yellow light under excitation.

### Claim 12 (depends on 11)

The phosphor of claim 11, wherein the phosphor has a hexagonal crystal structure.

### Claim 13 (depends on 4)

The phosphor of claim 4, wherein the phosphor emits a white light when excited by a 430-480 nm blue LED.

### Claim 14 (depends on 4)

The phosphor of claim 4, wherein when the phosphor is (Ba0.75Eu0.25O)4(Al2O3)5, the phosphor has the characteristic that it emits intense and broad red light under excitation.

### Claim 15 (depends on 14)

The phosphor of claim 14, wherein the phosphor has a hexagonal crystal structure.