US Patent No. 10,920,140

METHOD FOR PRODUCING FLUORESCENT MATERIAL


Patent No. 10,920,140
Issue Date February 16, 2021
Title Method For Producing Fluorescent Material
Inventorship Tomokazu Suzuki, Tokushima (JP)
Assignee NICHIA CORPORATION, Anan (JP)

Claim of US Patent No. 10,920,140

1. A method for producing a fluorescent material, comprising:preparing a raw material mixture including a compound containing at least one rare earth element Ln selected from the group consisting of Y, Gd, La, Lu, Sc and Sm, a compound containing at least one Group 13 element selected from Al and Ga, a compound containing Tb, a compound containing Ce and a compound containing Eu, wherein the raw material mixture contains each compound such that each element satisfies a composition represented by the following formula (I):
(Ln1-a-b-cTbaCebEuc)3(Al1-dGad)5O12  (I)
wherein parameters a, b, c and d satisfy 0.25?a<1, 0.008×10?2?b?1.5×10?2, 0.012×10?2?c?2×10?2, and 0?d?0.85; and
heat-treating the raw material mixture to obtain the fluorescent material.