Phosphor, preparation method for phosphor, and light emitting device having phosphor

Patent metadata

Field	Value
Publication number	US-11098249-B2
Application number	US-201716313883-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Jun 30, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Phosphor, a preparation method for the phosphor, and a light emitting device having the phosphor. The phosphor comprises an inorganic compound which at least comprises an element M, an element A, an element D, and an element R; the element M is one or two elements selected from the group consisting of Lu, La, Pr, Nd, Sm, Y, Tb, and Gd and must comprise Lu; the element A is Si and/or Ge; the element D is one or two elements selected from the group consisting of O, N, and F and must comprise N; the element R is Ce and/or Dy. Since the ionic radius of Lu3+ is smaller than that of La3+, when the inorganic compound comprises element Lu, the original ligand site would be contracted. In order to reduce lattice distortion due to the ligand site contraction, the adjacent ligand site expands, and the photochromic property is adjusted.

First claim

What is claimed is:

1. A phosphor, comprising an inorganic compound, characterized in that the inorganic compound at least comprises an element M, an element A, an element D, and an element R, of which the element M is one or two elements selected from the group consisting of Lu, La, Pr, Nd, Sm, Y, Tb, and Gd and must comprise Lu; the element A is Si and/or Ge; the element D is one or two elements selected from the group consisting of O, N, and F and must comprise N; the element R is Ce and/or Dy;
the element Lu has a mole ratio of 1 to 50% in the element M, and that the inorganic compound has a crystal structure the same as La 3 Si 6 N 11 ;
the phosphor has a peak wavelength of excitation spectrum at 420 to 460 nm, and can emit a peak wavelength covering the range between 515 to 540 nm.

2. The phosphor according to claim 1 , wherein the inorganic compound has a composition of M 3-a A x D y :aR, wherein parameters a, x and y satisfy the following conditions: 0<a≤0.8, 5≤x≤7, and 10≤y≤12.

3. The phosphor according to claim 2 , wherein the element Lu has a mole ratio of 1 to 40% in the element M.

4. The phosphor according to claim 2 , wherein the element A is Si.

5. The phosphor according to claim 2 , wherein the element D is N.

6. The phosphor according to claim 2 , wherein the element R is Ce or a combination of Ce with Dy.

7. The phosphor according to claim 6 , wherein 0.1≤a≤0.5; 5.5≤x≤6.5; and 10.5≤y≤11.5.

8. The phosphor according to claim 7 , wherein the element M comprises elements Lu and La, a sum of mole numbers of the elements Lu and La is from 80 to 100% in the mole number of the element M.

9. A light emitting device, comprising a fluorescent substance and an excitation light source, wherein the fluorescent substance comprises the phosphor according to claim 1 .

10. The light emitting device according to claim 9 , wherein the excitation light source is a semiconductor light emitting diode or a laser light source, preferably, the excitation light source has an emission peak wavelength of 400 to 490 nm.

11. The light emitting device according to claim 9 , wherein the fluorescent substance further comprises another/other phosphor(s) selected from the group consisting of any one or more of (Y,Gd,Lu,Tb) 3 (Al,Ga) 5 O 12 :Ce 3+ , β-SiAlON:Eu 2+ , (Ca,Sr)AlSiN 3 :Eu 2+ , (Li,Na,K) 2 (Ti,Zr,Si,Ge)F 6 :Mn 4+ and (Ca,Sr,Ba)MgAl 10 O 17 :Eu 2+ .

12. A method for preparing the phosphor according to claim 1 , comprising:
step 1)—using a simple substance, a nitride, an oxide selected from an element M, an element A, an element D and an element R or an alloy thereof as source materials, and mixing the source materials to obtain a mixture;
step 2)—placing the mixture into a container and calcinating the same in nitrogen or other non-oxidizing conditions to obtain a calcinated product, wherein the highest sintering temperature is from 1500 to 2000° C., and the holding time is 5 to 20 hours; and
step 3)—sequentially subjecting the calcinated product to crushing, washing, and sieving processes to obtain the phosphor.

13. The preparing method according to claim 12 , wherein the source materials of the elements are weighted and taken according to mole ratios of the elements in the chemical formula M 3-a A x D y :aR.

Assignees

• Grirem Advanced Mat Co Ltd

Inventors

• Liu Ronghui
• Zhuang Weidong
• Du Fu
• Liu Yuanhong
• Gao Wei
• Zhang Xia
• Xu Huibing
• Yan Chunpei
• Zhang Xiaowei

Classifications

• C09K11/77747 Primary

  Silicon Nitrides or Silicon Oxynitrides · CPC title

• C09K11/7766 Primary

  containing two or more rare earth metals · CPC title

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• C09K11/7774

  Aluminates · CPC title

• C09K11/7749

  Aluminates · CPC title