Patent ID: 7986088

Claim:
A fluorescence conversion medium, comprising: core/shell fluorescent fine particles, which absorb visible light, near ultraviolet light, or both and emits visible fluorescence, and a transparent medium having the core/shell fluorescent fine particles dispersed therein, wherein said core/shell fluorescent fine particles are a material selected from the group consisting of CdSe/ZnS, InP/ZnS, and ZnTe/ZnS, said core/shell fluorescent fine particles are present in said transparent medium in a concentration of from 7.0×10 −4 mol·L −1 to 85×10 −4 mol·L −1 , and said fluorescence conversion medium having an overlapping degree (P) represented by the following formula: P=∫A (λ)· I (λ) dλ of 4.1≦P≦23.6, wherein I(λ) (unit: nm −1 ) indicates the emission intensity spectrum of the fluorescence conversion medium standardized to have a maximum value of 1 and A(λ) (unit: infinite) indicates an absorbance spectrum of the fluorescence conversion medium, providing that the wavelength of light is λ (unit: nm).