METHOD OF PRODUCING ALUMINATE FLUORESCENT MATERIAL, ALUMINATE FLUORESCENT MATERIAL AND LIGHT EMITTING DEVICE

• US 20190330526A1
• Filed: 07/11/2019
• Published: 10/31/2019
• Est. Priority Date: 09/28/2016
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: TAKETOMI, Shozo, HOSOKAWA, Shoji, YOSHIDA, Tomokazu, NISHIMATA, Kazuya
• Granted Patent: US 11,142,686 B2
• Time in Patent Office: Days
• CPC Class Codes: C09K 11/643 with alkaline earth metals
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil

Abstract

Provided are a method of producing an aluminate fluorescent material, an aluminate fluorescent material and a light emitting device. The production method includes heat-treating a mixture prepared by mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, a Mg-containing compound not acting as a flux, a Mn-containing compound, an Al-containing compound, a first flux containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and a Mg-containing second flux to give an aluminate fluorescent material.

Claims

1. A method of producing a fluorescent material, comprising:

heat-treating a mixture prepared by mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, a Mg-containing compound not acting as a flux, a Mn-containing compound, an Al-containing compound, a first flux containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and a Mg-containing second flux to obtain the fluorescent material.

2. The method of producing a fluorescent material according to claim 1, wherein the compound containing at least one alkaline earth metal element comprises a Ba-containing compound.

3. The method of producing a fluorescent material according to claim 1, wherein the first flux containing at least one alkali metal element comprises a Na-containing compound and/or a K-containing compound.

4. The method of producing a fluorescent material according to of claim 1, wherein in the mixture, the molar amount of Mg in the Mg-containing compound not acting as a flux is in a range of 0 mol % or more and 69 mol % or less relative to the molar amount of the alkaline earth metal element, and the molar amount of Mg in the Mg-containing second flux is in a range of 1 mol % or more and 70 mol % or less.

5. The method of producing a fluorescent material according to of claim 1, wherein the Mg-containing second flux comprises magnesium fluoride.

6. The method of producing a fluorescent material according to claim 5, wherein the content of the magnesium fluoride is in a range of 1 mol % or more and 70 mol % or less relative to the molar amount of the alkaline earth metal element contained in the mixture.

7. The method of producing a fluorescent material according to claim 1, wherein the content of the first flux is in a range of 0.2 mol % or more and less than 30.0 mol % relative to the molar amount of the alkaline earth metal element contained in the mixture.