Phosphors for white light generation from UV emitting diodes
US6294800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Ca.sub.8 Mg(SiO.sub.4).sub.4 Cl.sub.2 :Eu.sup.2+,Mn.sup.2+ and Y.sub.2 O.sub.3 :Eu.sup.3+,Bi.sup.3+ are phosphors which have been sensitized to absorb ultraviolet radiation, such as from a light emitting diode, and to convert the radiation into visible light. A phosphor conversion material blend comprises Ca.sub.8 Mg(SiO.sub.4).sub.4 Cl.sub.2 :Eu.sup.2+,Mn.sup.2+ ; Y.sub.2 O.sub.3 :Eu.sup.3+,Bi.sup.3+, and known blue phosphors that absorb ultraviolet radiation from a LED and convert the radiation into visible bright white light. Also, a light emitting assembly comprises at least one of a red, green and blue phosphor for absorbing and converting ultraviolet radiation into visible light. A laser diode can be used to activate the phosphors to provide improved efficiency and brightness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.