Wavelength converting member
US9868270B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 2015 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Aug 13, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8514
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.