Phosphor for a UV emitting device and a UV generating device utilizing such a phosphor

Patent metadata

Field	Value
Publication number	US-11798798-B2
Application number	US-201917276046-A
Country	US
Kind code	B2
Filing date	Sep 13, 2019
Priority date	Sep 13, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

The invention relates to a phosphor for a UV emitting device, having the formula Na 1+x Ca 1−2x PO 4 :PR3 + x wherein 0<x<0.5.

First claim

The invention claimed is:

1. A phosphor for a UV emitting device, having the formula
Na 1+x Ca 1−2x PO 4 :PR 3+ x ,
wherein
0.01<x<0.1, and
wherein the phosphor is configured to convert vacuum ultraviolet (VUV) radiation to UV-C radiation.

2. The phosphor of claim 1 , wherein the value of x is 0.03<x<0.07.

3. A phosphor according to claim 1 , characterized in that the value of x is 0.04<x<0.06.

4. The phosphor of claim 1 , wherein the phosphor is essentially free of Yttrium.

5. A UV generating device comprising a phosphor according to claim 1 and a UV radiation source.

6. The phosphor according to claim 1 , wherein the phosphor is excited by a light having a wavelength of 172 nm and 185 nm to emit an ultraviolet light in the range of 230 nm to 260 nm.

7. A method comprising:
providing a phosphor having the formula: Na 1+x Ca 1−2x PO 4 :PR 3+ x , wherein 0<x<0.5;
exposing the phosphor to VUV radiation; and
converting the VUV radiation to UV-C radiation using the phosphor.

8. The method of claim 7 , further comprising placing the phosphor inside a gas discharge lamp.

9. The method according to claim 7 , further comprising exposing water or wastewater to the UV-C radiation emitted by the phosphor.

10. A UV generating device comprising:
a phosphor having the formula Na 1+x Ca 1−2x PO 4 :PR 3+ x , wherein 0<x<0.5, and
a UV radiation source comprising a gas discharge lamp.

11. The UV generating device according to claim 10 , wherein the UV radiation source comprises a low pressure mercury gas discharge lamp.

12. The UV generating device according to claim 10 , wherein the UV radiation source comprises a low pressure mercury amalgam gas discharge lamp.

13. The UV generating device according to claim 10 , wherein the UV radiation source comprises an excimer lamp.

14. The UV generating device according to claim 13 , wherein the UV radiation source comprises an excimer gas discharge lamp with a gas filling that predominately emits a second Xenon excimer continuum.

15. The UV generating device according to claim 13 , wherein the UV radiation source comprises an excimer gas discharge lamp with a gas filling that is essentially free of mercury.

16. The UV generating device according to claim 14 , wherein the gas filling contains more than 50% by volume of Xenon.

17. The UV generating device according to claim 14 , wherein upon excitation the phosphor emits an ultraviolet light in the range of 230 nm to 260 nm.

Assignees

• Xylem Europe Gmbh

Inventors

• Salvermoser Manfred
• Broxtermann Mike
• Keil Jan-Niklas
• JüSTEL THOMAS

Classifications

• H01J61/16 Primary

  having helium, argon, neon, krypton, or xenon as the principle constituent · CPC title

• C01F17/30

  Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 (C01F17/247 - C01F17/294 take precedence) · CPC title

• C02F1/325

  Irradiation devices or lamp constructions · CPC title

• C09K11/771 Primary

  with alkaline earth metals · CPC title

• H01J61/44

  Devices characterised by the luminescent material · CPC title