| 简介 |
PROBLEM TO BE SOLVED : To provide a light emitting device which emits homogeneous light with a high output. SOLUTION : A light emitting device comprises a container (1), a light emission chip (2) disposed on the bottom of the container, and a phosphor layer (3) formed having a thickness of not smaller than 80 μm and not larger than 240 μm on the top face of the light emission chip. The phosphor layer is composed of a resin wherein phosphor particles having grain sizes of not smaller than 20 μm and not larger than 45 μm is dispersed at the concentration of not smaller than 40 wt.% and notlar than 60 wt.% and has unevenness reflecting shapes of the phosphor particles on the surface. The phosphor particles contain at least one kind selected from among a group composed of a yttrium aluminum garnet oxide phosphor, an alkaline-earth metal silicate based phosphor, a nitride based phosphor, an alkaline-earth silicon nitride based phosphor, a rare-earth oxychalcogenide based phosphor, an alkaline-earth silicon oxynitride based phosphor, and an alkaline-earth magnesium silicate based phosphor. COPYRIGHT : (C)2010, JPO&INPIT |
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