Phosphor mixture and light emitting device
US7477009B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 8, 2005 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Aug 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
To provide a phosphor mixture realizing a light emitting device having a phosphor and a light emission element, by which light emission is performed, with a small color shift due to a feeding current and having an excellent color rendering properties. CaAlSin3:Eu as a red phosphor and YAG:Ce as a yellow phosphor are manufactured, and emission spectra thereof are obtained. Meanwhile, the emission spectrum of an excitation light emitted by a light emitting part is obtained. From the emission spectra thus obtained, a relative mixing ratio of each phosphor is obtained by simulation, so that a correlated color temperature of the light emitting device becomes a target temperature. Then, based on the relative mixing ratio thus obtained, each phosphor is measured and mixed, and a phosphor mixture is thereby obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.