Light wavelength conversion member and light emitting device
US10910524B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2017 |
| Grant date | Feb 2, 2021 |
| Priority date | — |
| Expiry date | Oct 20, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8506
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The light-emitting device (1) includes a container (3), a light-emitting element (5), and an optical wavelength conversion member (9). The optical wavelength conversion member (9) is composed of a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains of a component represented by formula A3B5O12:Ce. Specifically, A and B of the A3B5O12 individually represent at least one element selected from the following element groups: A: Sc, Y, and lanthanoids (except for Ce), and B: Al and Ga; the at least one element selected from the element groups is present in each crystal grain and the crystal grain boundary of the ceramic sintered body; and the element concentration of the crystal grain boundary is higher than the element concentration of the crystal grain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.