Phosphor, method for producing phosphor and light emitting device
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsDaichi Usui, Yasuhiro Shirakawa, Hirofumi Takemura, Tsutomu Ishii
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Abstract
The present invention provides a phosphor comprising a cerium-activated sialon crystal having a basic composition represented by formula (1): (Sr1-xCex)αSiβAlγOδNω formula: (1) (wherein, x is 0<x<1, α is 0<α≦3, and β, γ, δ and ω are numbers such that numerical values converted when α is 2 satisfy 5≦β≦9, 1≦γ≦5, 0≦δ≦1.5, and 10≦ω≦20), wherein the phosphor includes particles having a sphericity of 0.65 or more and emits yellow light by being excited by ultraviolet light, violet light or blue light.
Claims8
A phosphor comprising a cerium-activated sialon crystal having a basic composition represented by formula (1):
- [Formula 1]
- (Sr1-xCex)αSiβAlγOδNω (1)
- (wherein, x is 0<x<1, α is 0<α≦3, and β, γ, δ and ω are numbers such that numerical values converted when α is 2 satisfy 5≦β≦9, 1≦γ≦5, 0≦δ≦1.5, and 10≦ω≦20),
- wherein the phosphor includes particles having a sphericity of 0.65 or more and emits yellow light by being excited by ultraviolet light, violet light or blue light.
Dependencies are inferred from the claim text.