Method for producing fluorescent material, and fluorescent material

Patent metadata

Field	Value
Publication number	US-11078414-B2
Application number	US-201916368984-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Mar 29, 2018
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A method for producing a γ-AlON fluorescent material, comprising: preparing a first mixture containing a compound containing Mn, a compound containing Li, a compound containing Mg, an aluminum oxide, and an aluminum nitride, in which the amount of fluorine is 150 ppm by mass or less relative to the total amount of the first mixture excluding fluorine, and subjecting the first mixture to a first heat treatment to obtain a first calcined product having an average particle diameter D 1 , as measured according to a Fisher Sub-Sieve Sizer method, of 10.0 μm or more; and preparing a second mixture containing the first calcined product, a compound containing Mn, a compound containing Li, a compound containing Mg, an aluminum oxide, and an aluminum nitride, in which the amount of fluorine is 150 ppm by mass or less relative to the total amount of the second mixture excluding fluorine, and subjecting the second mixture to a second heat treatment to obtain a second calcined product having an average particle diameter D 2 , as measured according to the Fisher Sub-Sieve Sizer method, of 16.0 μm or more, wherein the second mixture contains the first calcined product in an amount of more than 20% by mass and 82% by mass or less.

First claim

The invention claimed is:

1. A method for producing a γ-AlON fluorescent material, comprising:
preparing a first mixture containing a compound containing Mn, a compound containing Li, a compound containing Mg, an aluminum oxide, and an aluminum nitride, in which the amount of fluorine is 150 ppm by mass or less relative to the total amount of the first mixture excluding fluorine, and subjecting the first mixture to a first heat treatment to obtain a first calcined product having an average particle diameter D 1 , as measured according to a Fisher Sub-Sieve Sizer method, of 10.0 μm or more; and
preparing a second mixture containing the first calcined product, a compound containing Mn, a compound containing Li, a compound containing Mg, an aluminum oxide, and an aluminum nitride, in which the amount of fluorine is 150 ppm by mass or less relative to the total amount of the second mixture excluding fluorine, and subjecting the second mixture to a second heat treatment to obtain a second calcined product having an average particle diameter D 2 , as measured according to the Fisher Sub-Sieve Sizer method, of 16.0 μm or more, wherein the second mixture contains the first calcined product in an amount of more than 20% by mass and 82% by mass or less relative to the total amount of the second mixture excluding fluorine.

2. The method for producing a γ-AlON fluorescent material according to claim 1 , wherein at least one of the temperature in the first heat treatment and the temperature in the second heat treatment falls within a range of 1,600° C. or higher and 1,900° C. or lower.

3. The method for producing a γ-AlON fluorescent material according to claim 1 , further comprising subjecting the second calcined product to an annealing treatment to obtain an annealing-treated product.

4. The method for producing a γ-AlON fluorescent material according to claim 3 , wherein the temperature in the annealing treatment falls within a range of 1,100° C. or higher and 1,500° C. or lower.

5. The method for producing a γ-AlON fluorescent material according to claim 1 , wherein the second mixture comprises the aluminum oxide and the aluminum nitride in a total amount of 15% by mass or more relative to the total amount of the second mixture excluding fluorine.

6. The method for producing a γ-AlON fluorescent material according to claim 1 , wherein the second mixture comprises the first calcined product in an amount of 40% by mass or more and 80% by mass or less relative to the total amount of the second mixture excluding fluorine.

7. The method for producing a γ-AlON fluorescent material according to claim 1 , wherein the second calcined product comprises a composition represented by the following formula (I):
Mn a Mg b Li c Al d O e N f F g   (I)

wherein a, b, c, d, e, f, and g each satisfy 0.005≤a≤0.02, 0.01≤b≤0.035, 0.01≤c≤0.04, 0.3≤d≤0.45, 0.4≤e≤0.6, 0.03≤f≤0.06, and 0≤g≤0.00016, when a+b+c+d+e+f=1.

8. A γ-AlON fluorescent material, comprising a composition represented by the following formula (I), and having an average particle diameter, as measured according to the Fisher Sub-Sieve Sizer method, of 16 μm or more:
Mn a Mg b Li c Al d O e N f F g   (I)

wherein a, b, c, d, e, f, and g each satisfy 0.005≤a≤0.02, 0.01≤b≤0.035, 0.01≤c≤0.04, 0.3≤d≤0.45, 0.4≤e≤0.6, 0.03≤f≤0.06, and 0≤g≤0.00016, when a+b+c+d+e+f=1.

Assignees

• Nichia Corp

Inventors

• Miyai Ryuta
• Nishimata Kazuya
• Hosokawa Shoji

Classifications

• C09K11/643 Primary

  with alkaline earth metals · CPC title

• C09K11/645

  with alkali or alkaline earth metals · CPC title

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title

• C09K11/57

  containing manganese or rhenium · CPC title