Light emitting film, luminescent device, method for manufacturing light emitting film and method for manufacturing luminescent device
US7923918B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2004 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Mar 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/181
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a reliable, long-life phosphor, or the like, which is prevented from darkening due to aging. A light emitting apparatus has a light emitting element and a phosphor layer. The phosphor layer has a phosphor excited by light from the light emitting element, and a binder which binds the phosphor. The binder is hydroxide oxide gel obtained by curing sol of a hydroxide oxide mixed with sol containing at least one metallic element selected from the group consisting of Al, Y, Gd, Lu, Sc, Ga, In, and B. Transmittance of hydroxide oxide in a gel state is higher than the transmittance in the polycrystal state where the sol-gel reaction is proceeded. In addition, the content of hydroxyl group or water of crystallization in the hydroxide oxide is 10% or less by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.