LIGHT EMITTING DEVICE AND METHOD OF MANUFACTURING THEREOF

摘要

A light emitting device includes a package having side walls which define a recess, a light emitting element arranged in the recess, and a sealing member which seals the light emitting element. The sealing member includes a first portion which contains a fluorescent material and covers the light emitting element, and a second portion which does not contain a fluorescent material and is arranged over the first portion. The fluorescent material is a fluoride fluorescent material activated with tetravalent manganese represented by the following formula (I). The particles of the fluorescent material has a surface region with a tetravalent manganese ion concentration is lower than inner side.;A2[M1-bMn4+bF6]  (I);In the formula (I), A is a cation which contains K+ and may contain at least one selected from the group consisting of Li+, Na+, Rb+, Cs+, and NH4+, M is at least one of Group 4 and Group 14 elements, and 0

主权项

1. A light emitting device comprising:
a package having side walls which define a recess; a light emitting element arranged in the recess; and a sealing member which seals the light emitting element; wherein the sealing member comprises a first portion which contains a fluorescent material and covers the light emitting element, and a second portion which contains substantially no fluorescent material and is arranged over the first portion, and the fluorescent material contains particles of a fluoride fluorescent material which is activated with tetravalent manganese ion and has a chemical composition represented by the following formula (I), and which has a surface region where a tetravalent manganese ion concentration is lower than a tetravalent manganese ion concentration of an inner region,
A2[M1-bMn4+bF6]  (I)wherein A is a cation which contains at least K+ and may further contain at least one selected from the group consisting of Li+, Na+, Rb+, Cs+, and NH4+, M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and 0