Light-emitting device
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKazuhiro Wataya, Toshihiko Tsukatani, Shintaro Tanaka
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Abstract
A light-emitting device is provided comprising an excitation light source capable of emitting laser light and a phosphor adapted to convert the wavelength of the laser light and to generate light of converted wavelength. The phosphor is polycrystalline secondary particles each consisting of a plurality of primary particles and containing therein pores with a diameter of 0.2-25 μm. The device produces light of quality in that the speckle noise that gives a glare or strange sense to eyesight when the light is illuminated to a rough surface is reduced.
Claims4
A light-emitting device comprising an excitation light source capable of emitting laser light as excitation light and a phosphor adapted to be excited with the laser light, to convert wavelength of the excitation light and to generate light of converted wavelength,
- said phosphor being in the form of polycrystalline secondary particles each consisting of a plurality of primary particles and containing therein pores with a diameter of at least 0.2 μm.
Dependencies are inferred from the claim text.