Phosphate phosphor, light emitting device, and detecting device

Patent metadata

Field	Value
Publication number	US-11879084-B2
Application number	US-202017103972-A
Country	US
Kind code	B2
Filing date	Nov 25, 2020
Priority date	Sep 30, 2020
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

In the present disclosure embodiments, a phosphate phosphor including an activation center of trivalent chromium and a light emitting device are provided. The light emitting device includes a light source and the above mentioned phosphate phosphor, such that the phosphate phosphor is excited by the light source and emits a wide spectrum of the infrared light. The light emitting device with wide emission spectrum of the infrared light may be widely applied in detecting devices.

First claim

What is claimed is:

1. A phosphate phosphor, comprising:
an activation center of trivalent chromium, wherein the phosphate phosphor emits an infrared light after excitation from a light,
wherein the phosphate phosphor has a general formula Sr 9 Sc 1-x (PO 4 ) 7 :xCr 3+ , and 0<x≤1.

2. The phosphate phosphor of claim 1 , wherein a crystal structure of the phosphate phosphor is monoclinic.

3. The phosphate phosphor of claim 1 , wherein the light comprises an ultraviolet light, a blue light, or a red light.

4. The phosphate phosphor of claim 3 , wherein the infrared light has an emission wavelength between about 700 nm to 1100 nm.

5. The phosphate phosphor of claim 3 , wherein the infrared light has a peak with peak wavelength between about 780 nm to 950 nm and full width at half maximum between about 90 nm to 200 nm.

6. The phosphate phosphor of claim 1 , wherein the phosphate phosphor has an internal quantum efficiency in a range of about 65% to 100%.

7. A light emitting device, comprising:
the phosphate phosphor of claim 1 ; and
a light source configured to emit the light.

8. The light emitting device of claim 7 , wherein the light source comprises an ultraviolet light source configured to emit the light with wavelength between about 300 nm to 350 nm.

9. The light emitting device of claim 7 , wherein the light source comprises a blue light source configured to emit the light with wavelength between about 400 nm to 550 nm.

10. The light emitting device of claim 7 , wherein the light source comprises a red light source configured to emit the light with wavelength between about 600 nm to 780 nm.

11. The light emitting device of claim 7 , wherein the light source comprises a light emitting diode.

12. The light emitting device of claim 7 , wherein the infrared light has a wide emission spectrum with wavelength between about 700 nm to 1100 nm.

13. A detecting device, comprising:
a light emitting device, comprising:
the phosphate phosphor of claim 1 ; and
a light source configured to emit the light; and

a sensing device configured to receive the infrared light after external absorption or reflection.

14. The detecting device of claim 13 , wherein the light source comprises an ultraviolet light source, a blue light source, or a red light source.

15. The detecting device of claim 13 , wherein the infrared light emitted from the light emitting device has a wide emission spectrum with wavelength between about 700 nm to 1100 nm.

Assignees

• Lextar Electronics Corp

Inventors

• Lin Chun-Che
• Lu Chun-Han
• Tsai Yi-Ting
• Lee Yu-Chun
• Tsai Tzong-Liang

Classifications

• H10H20/8512

  Wavelength conversion materials · CPC title

• C09K11/717 Primary

  Aluminates; Silicates · CPC title

• H01L33/502

  Electricity · mapped topic

• C09K11/71 Primary

  also containing alkaline earth metals · CPC title

• Y02B20/00

  Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps · CPC title