VUV-excited device with blue-emitting phosphor
US7535176B2 · kind B2 · utility
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7References
15Claims
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Assignee
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Key dates
| Filing date | May 13, 2004 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Feb 13, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J65/046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Blue-emitting phosphors for use with plasma display panels (PDP) or other vacuum ultraviolet-excited (VUV) devices are provided. These blue-emitting phosphors and mixtures thereof include at least a europium-activated calcium-substituted barium hexa-aluminate (CBAL) phosphor. Preferably, the CBAL phosphor has a composition which may be represented by the formula: Ba1.29-x-yCaxEuyAl12O19.29, wherein 0<x<0.25 and 0.01<y<0.20. These blue-emitting phosphors exhibit improved degradation characteristics, including reduced color shift and increased intensity maintenance, under conditions found in VUV-excited devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.