Method for producing wavelength converting member, and wavelength converting member
AssigneeNichia Corporation
InventorsTomoya Fukui, Tadayoshi Yanagihara
Life of this patent
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Abstract
A method for producing a wavelength converting member that emits light under irradiation of excitation light, and a wavelength converting member. The method for producing a wavelength converting member, including: providing a green body prepared by a process comprising molding a mixed powder containing a Ca-α-SiAlON fluorescent material and alumina, and depending on necessity an YAG fluorescent material; and primarily sintering the green body at a temperature in a range of 1,000° C. or more and 1,600° C. or less to obtain a first sintered body.
Claims14
A method for producing a wavelength converting member, comprising:
- providing a green body prepared by a process comprising molding a mixed powder comprising a Ca-α-SiAlON fluorescent material and alumina;
- and
- primarily sintering the green body at a temperature in a range of 1,500° C. or more and 1,550° C. or less to obtain a first sintered body in an atmosphere containing 99% by volume or more nitrogen gas,
- wherein the mixed powder contains the Ca-α-SiAlON fluorescent material in a content in a range of 0.1% by mass or more and 40% by mass or less with respect to 100% by mass of the mixed powder, and
- wherein the Ca-α-SiAlON fluorescent material is represented by the following formula (II):
- MkSi12−(m+n)Alm+nOnN16−n:Eu (II)
- wherein in the formula, M is at least one element selected form the group consisting of Li, Mg, Ca, Sr, Y and lanthanoid elements excluding La and Ce, and k, m and n satisfy 0<k≤2.0, 2.0≤m≤6.0, 0≤n≤1.0,
- wherein molding the mixed powder comprises using a combination of a press molding first and then a cold isostatic pressing (CIP), and
- wherein a pressure in the press molding is 3 MPa to 50 MPa and a pressure in the cold isostatic pressing (CIP) is 50 MPa to 250 MPa.
Dependencies are inferred from the claim text.