Display device with aluminate-based green phosphors
US7541728B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2005 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Sep 17, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/63
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Novel aluminate-based green phosphors are disclosed having the formula M1−xEuxAlyO1+3y/2, where M is at least one of a divalent metal selected from the group consisting of Ba, Sr, Ca, Mg, Mn, Zu, Cu, Cd, Sm, and Tm; 0.1<x<0.9; and 0.5:≦y≦12. phosphors are configured to absorb substantially non-visible radiation having a wavelength ranging from about 280 to 420 nm, and emit visible green light having a wavelength ranging from about 500 to 550 nm. In a particular embodiment, the phosphor contains the divalent alkaline earth metals Mg, and Mn may be present as well. A novel feature of the present aluminate-based green phosphors is the relatively narrow range of wavelength over which they can be configured to emit; in one embodiment, this range is from about 518 nm to 520 nm. In an alternative embodiment, the phosphor emits visible light with a peak wavelength having a full width at half maximum of less than or equal to about 40 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.