RED-LIGHT-EMITTING PHOSPHOR AND LIGHT EMITTER USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a red-light-emitting phosphor having the characteristics of an La2O2S: Eu, Sm phosphor (a red-light-emitting phosphor) capable of efficiently giving a red light when excited with a long-wavelength ultraviolet radiation and moreover improving temperature characteristics.

SOLUTION: The red-light-emitting phosphor comprises a trivalent-europium and samarium-activated lanthanum oxysulfide phosphor having a composition represented by (La1-x-yEuxSmy)2O2S.mM2O3(wherein M is at least one metal element selected from Ga and In; 0.01≤x≤0.15; 0.00005≤y≤0.05; and 0.00001≤m≤0.001). A light emitter is provided with a light-emitting part (16) that contains the red-light-emitting phosphor and emits a visible light when excited with an ultraviolet radiation from a light source 11.

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