Wavelength converting member
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United States of America Patent
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Jan 16, 2018
Grant Date -
Sep 3, 2015
app pub date -
Mar 2, 2015
filing date -
Mar 3, 2014
priority date (Note) -
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Abstract
Provided is a wavelength converting member made of a sintered body which inhibits color unevenness of exit light after wavelength conversion and has excellent light emitting efficiency and inhibited decrease in mechanical strength. The wavelength converting member includes a plate-like sintered body having one principal surface as a light entrance surface and the other principal surface as a light exit surface, and a porosity of 0.1% or less with fluorescent material grains containing an activator and light-transmitting material grains, the entrance surface and the exit surface are sintered surfaces in which the fluorescent material grains and light-transmitting material grains are exposed without processing. The sintered surface has an average roughness Ra of 0.1 μm to 0.5 μm, the fluorescent material grains exposed on a surface have an average roughness Ra1 of 0.2 nm to 0.5 nm, and the light-transmitting material grains exposed on a surface have an average roughness Ra2 of 0.3 nm to 0.7 nm.
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