Fluorescent substance, method of manufacturing the fluorescent substance, and light emitting device using the fluorescent substance

Patent metadata

Field	Value
Publication number	US-9708531-B2
Application number	US-201013203444-A
Country	US
Kind code	B2
Filing date	Feb 26, 2010
Priority date	Feb 26, 2009
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A fluorescent substance is provided having excellent temperature properties and capable of being excited by light in the region from near ultraviolet to short-wavelength visible light to emit light of yellow to red color. A process for producing the fluorescent substance, and a light emitting device using the fluorescent substance is also provided. The fluorescent substance includes M which is at least one group II element selected from Ca, Sr, and Ba, and Al, Si, O, and N, and activated with Eu. The fluorescent substance has an X-ray diffraction pattern using CuKα radiation, in which the intensity of the diffraction peak in the Bragg angle range of 17.9° to 18.5° is taken as 100%, the relative intensity of the diffraction peak is 150% to 310% in a Bragg angle range of 24.5° to 25.1° , and is 320% to 550% in a Bragg angle range of 34.8° to 35.4°.

First claim

What is claimed is:

1. A fluorescent substance that has an emission peak wavelength at 584 nm to 630 nm upon being excited by a light source of 460 nm, wherein:
the fluorescent substance is Sr 1.78 Eu 0.22 Al 5.73 Si 7.39 O 1.35 N 15.62 , and
the fluorescent substance has a formation phase whose main phase shows, in an X-ray diffraction pattern using CuKα radiation with an intensity of a diffraction peak in a Bragg angle range of 17.9° to 18.5° taken as 100%, a relative intensity of the diffraction peak in a range of 150% to 310% in a Bragg angle range of 24.5° to 25.1° and a relative intensity of the diffraction peak in a range of 320% to 550% in a Bragg angle range of 34.8° to 35.4°.

2. The fluorescent substance according to claim 1 , wherein a relative intensity of the diffraction peak is in a range of 190% to 460% in a Bragg angle range of 30.6° to 31.2°.

3. The fluorescent substance according to claim 1 , wherein a relative intensity of the diffraction peak is in a range of 270% to 570% in a Bragg angle range of 35.7° to 36.3°.

4. The fluorescent substance according to claim 1 , wherein a relative intensity of the diffraction peak is in a range of 160% to 320% in a Bragg angle range of 68.7° to 69.3°.

5. The fluorescent substance according to claim 1 , wherein the formation phase belongs to orthorhombic system with lattice constant in a range of 4.4 Å≦a ≦5.4 Å, 7.0 Å≦b≦8.0 Å, and 11.1 Å≦c≦12.1 Å.

6. The fluorescent substance according to claim 1 , wherein half bandwidth of emission spectra of the fluorescent substance is in a range of 100 nm to 125 nm.

7. A light emitting device comprising:
an excitation light source configured to emit light having a peak wavelength in a range from near-ultraviolet to short wavelength range of visible light, and
a fluorescent substance capable of absorbing a part of light from the excitation light source and emitting fluorescent light;
wherein the fluorescent substance comprises the fluorescent substance according to claim 1 .

8. A fluorescent substance that has an emission peak wavelength at 584 nm to 630 nm upon being excited by a light source of 460 nm, wherein :
the fluorescent substance is Sr 1.78 Eu 0.22 Al 4.09 Si 7.76 O 1.30 N 14.23 , and
the fluorescent substance has a formation phase whose main phase shows, in an X-ray diffraction pattern using CuKα radiation with an intensity of a diffraction peak in a Bragg angle range of 17.9° to 18.5° taken as 100%, a relative intensity of the diffraction peak in a range of 150% to 310% in a Bragg angle range of 24.5° to 25.1° and a relative intensity of the diffraction peak in a range of 320% to 550% in a Bragg angle range of 34.8° to 35.4°.

9. The fluorescent substance according to claim 8 , wherein a relative intensity of the diffraction peak is in a range of 190% to 460% in a Bragg angle range of 30.6° to 31.2°.

10. The fluorescent substance according to claim 8 , wherein a relative intensity of the diffraction peak is in a range of 270% to 570% in a Bragg angle range of 35.7° to 36.3°.

11. The fluorescent substance according to claim 8 , wherein a relative intensity of the diffraction peak is in a range of 160% to 320% in a Bragg angle range of 68.7° to 69.3°.

12. The fluorescent substance according to claim 8 , wherein the formation phase belongs to orthorhombic system with lattice constant in a range of 4.4 Å≦a ≦5.4 Å, 7.0 Å≦b≦8.0 Å, and 11.1 Å≦c≦12.1 Å.

13. The fluorescent substance according to claim 8 , wherein half bandwidth of emission spectra of the fluorescent substance is in a range of 100 nm to 125 nm.

14. A light emitting device comprising:
an excitation light source configured to emit light having a peak wavelength in a range from near-ultraviolet to short wavelength range of visible light, and
a fluorescent substance capable of absorbing a part of light from the excitation light source and emitting fluorescent light;
wherein the fluorescent substance comprises the fluorescent substance according to claim 8 .

15. A fluorescent substance that has an emission peak wavelength at 584 nm to 630 nm upon being excited by a light source of 460 nm, wherein :
the fluorescent substance is Sr 1.80 Eu 0.209 Al 4.19 Si 7.71 O 1.51 N 14.79 , and
the fluorescent substance has a formation phase whose main phase shows, in an X-ray diffraction pattern using CuKα radiation with an intensity of a diffraction peak in a Bragg angle range of 17.9° to 18.5° taken as 100%, a relative intensity of the diffraction peak in a range of 150% to 310% in a Bragg angle range of 24.5° to 25.1° and a relative intensity of the diffraction peak in a range of 320% to 550% in a Bragg angle range of 34.8° to 35.4°.

16. The fluorescent substance according to claim 15 , wherein a relative intensity of the diffraction peak is in a range of 190% to 460% in a Bragg angle range of 30.6° to 31.2°.

17. The fluorescent substance according to claim 15 , wherein a relative intensity of the diffraction peak is in a range of 270% to 570% in a Bragg angle range of 35.7° to 36.3°.

18. The fluorescent substance according to claim 15 , wherein a relative intensity of the diffraction peak is in a range of 160% to 320% in a Bragg angle range of 68.7° to 69.3°.

19. The fluorescent substance according to claim 15 , wherein the formation phase belongs to orthorhombic system with lattice constant in a range of 4.4 Å≦a≦5.4 Å, 7.0 Å≦b≦8.0 Å, and 11.1 Å≦c≦12.1 Å.

20. The fluorescent substance according to claim 15 , wherein half bandwidth of emission spectra of the fluorescent substance is in a range of 100 nm to 125 nm.

21. A light emitting device comprising:
an excitation light source configured to emit light having a peak wavelength in a range from near-ultraviolet to short wavelength range of visible light, and
a fluorescent substance capable of absorbing a part of light from the excitation light source and emitting fluorescent light;
wherein the fluorescent substance comprises the fluorescent substance according to claim 15 .

Assignees

• Shinohara Takayuki
• Hosokawa Shoji
• Nichia Corp

Inventors

• Shinohara Takayuki
• Hosokawa Shoji

Classifications

• H10W90/726

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• C09K11/77348

  Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides · CPC title

• C09K11/77342

  Silicates · CPC title

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title