Aluminate fluorescent material, light emitting device using the same, and method of producing aluminate fluorescent material

Patent metadata

Field	Value
Publication number	US-11028320-B2
Application number	US-201816233545-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Jun 9, 2016
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5<b<a≤0.5b+0.5<1.0, the parameter m satisfies 0≤m≤1.0, and the parameter n satisfies 0.4≤n≤0.7.

First claim

What is claimed is:

1. A method of producing an aluminate fluorescent material, comprising:
mixing compounds that contain elements to provide a composition containing a first element that contains one or more elements selected from Ba and Sr, a second element that contains Mg and Mn, and Al and O to obtain a raw material mixture, and
heat-treating the raw material mixture, wherein:
in the composition, when a molar ratio of Al is taken as 10, a total molar ratio of the first element is a value of a parameter a, a total molar ratio of the second element is a value of a parameter b, a molar ratio of Sr is a product of a value of a parameter m and the value of the parameter a, a molar ratio of Mn is a product of a value of a parameter n and the value of the parameter b, and
the values of the parameters a and b satisfy the following requirement (1), the value of the parameter m satisfies the following requirement (2), and the value of the parameter n satisfies the following requirement (3):
0.7 <b<a ≤0.5 b+ 0.5<1.0  (1), and

0 ≤m ≤1.0  (2)

wherein the value of the parameter n satisfies 0.6≤n<0.7, or the product of the value of the parameter b and the value of the parameter n (b×n) is a value satisfying 0.3<b×n<0.6.

2. The method of producing an aluminate fluorescent material according to claim 1 , wherein the compounds containing elements comprise a compound containing aluminum, a compound containing barium, optionally a compound containing strontium, a compound containing magnesium, and a compound containing manganese.

3. The method of producing an aluminate fluorescent material according to claim 2 , wherein the compound containing aluminum includes an Al-containing oxide, an Al-containing hydroxide, an Al-containing nitride, an Al-containing oxynitride, an Al-containing fluoride, an Al-containing chloride, or a combination thereof.

4. The method of producing an aluminate fluorescent material according to claim 3 , wherein the compound containing aluminum includes Al 2 O 3 , Al(OH) 3 , AlN, AlF 3 , AlCl 3 , or a combination thereof.

5. The method of producing an aluminate fluorescent material according to claim 2 , wherein the compound containing barium includes a Ba-containing oxide, a Ba-containing hydroxide, a Ba-containing carbonate, a Ba-containing nitrate, a Ba-containing sulfate, a Ba-containing carboxylate, a Ba-containing halide, a Ba-containing nitride, or a combination thereof.

6. The method of producing an aluminate fluorescent material according to claim 5 , wherein the compound containing barium (Ba) includes BaO, Ba(OH) 2 .8H 2 O, BaCO 3 , Ba(NO 3 ) 2 , BaSO 4 , Ba(OCOH) 2 .2H 2 O, Ba(OCOCH 3 ) 2 , BaCl 2 .6H 2 O, Ba 3 N 2 , or a combination thereof.

7. The method of producing an aluminate fluorescent material according to claim 2 , wherein the compound containing strontium includes a Sr-containing oxide, a Sr-containing hydroxide, a Sr-containing carbonate, a Sr-containing nitrate, a Sr-containing sulfate, a Sr-containing carboxylate, a Sr-containing halide, a Sr-containing nitride, or a combination thereof.

8. The method of producing an aluminate fluorescent material according to claim 7 , wherein the compound containing strontium includes SrO, Sr(OH) 2 .8H 2 O, SrCO 3 , Sr(NO 3 ) 2 .4H 2 O, SrSO 4 , Sr(OCOH) 2 .H 2 O, Sr(OCOCH 3 ) 2 .0.5H 2 O, SrCl 2 .6H 2 O, Sr 3 N 2 , or a combination thereof.

9. The method of producing an aluminate fluorescent material according to claim 2 , wherein the compound containing magnesium includes a Mg-containing oxide, a Mg-containing hydroxide, a Mg-containing carbonate, a Mg-containing nitrate, a Mg-containing sulfate, a Mg-containing carboxylate, a Mg-containing halide, a Mg-containing nitride, or a combination thereof.

10. The method of producing an aluminate fluorescent material according to claim 9 , wherein the compound containing magnesium (Mg) includes MgO, Mg(OH) 2 , 3MgCO 3 .Mg(OH) 2 .3H 2 O, MgCO 3 .Mg(OH) 2 .2H 2 O, Mg(NO 3 ) 2 .6H 2 O, MgSO 4 , Mg(OCOH) 2 .H 2 O, Mg(OCOCH 3 ) 2 .4H 2 O, MgCl 2 , Mg 3 N 2 , or a combination thereof.

11. The method of producing an aluminate fluorescent material according to claim 2 , wherein the compound containing manganese includes a Mn-containing oxide, a Mn-containing hydroxide, a Mn-containing carbonate, a Mn-containing nitrate, a Mn-containing sulfate, a Mn-containing carboxylate, a Mn-containing halide, a Mn-containing nitride, or a combination thereof.

12. The method of producing an aluminate fluorescent material according to claim 11 , wherein the compound containing manganese includes MnO 2 , Mn 2 O 3 , Mn 3 O 4 , MnO, Mn(OH) 2 , MnCO 3 , Mn(NO 3 ) 2 , Mn(OCOCH 3 ) 2 .2H 2 O, Mn(OCOCH 3 ) 3 .2H 2 O, MnCl 2 .4H 2 O, or a combination thereof.

13. The method of producing an aluminate fluorescent material according to claim 1 , wherein the raw material mixture comprises the compounds containing elements and a flux, the flux includes a halide of a rare earth metal, a halide of an alkaline earth metal, or a halide of an alkali metal.

14. The method of producing an aluminate fluorescent material according to claim 13 , wherein the flux includes barium fluoride, strontium fluoride, magnesium fluoride, aluminum fluoride, manganese fluoride or calcium fluoride.

15. The method of producing an aluminate fluorescent material according to claim 13 , wherein a content of the flux is 10% by mass or less, based on the raw material mixture (100% by mass).

16. The method of producing an aluminate fluorescent material according to claim 1 , wherein the heat-treating of the raw material mixture is carried out at a temperature in a range of 1,000° C. or higher and 1,800° C.

17. The method of producing an aluminate fluorescent material according to claim 1 , wherein the heat-treating of the raw material mixture is carried out in a reductive atmosphere containing hydrogen.

Assignees

• Nichia Corp

Inventors

• Yoshida Tomokazu
• Nishimata Kazuya
• Hosokawa Shoji

Classifications

• H10W90/756

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

• H10W72/884

  Die-attach connectors and bond wires · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• C09K11/0838 Primary

  Aluminates; Silicates · CPC title

• C09K11/57

  containing manganese or rhenium · CPC title