Thin film electroluminescent device
US6451460B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Sep 28, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/917
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light emitting phosphor material for an alternating current thin-film electroluminescent device that includes the phosphor material sandwiched between a pair of dielectric layers. The phosphor material comprises a first layer having a thickness greater than 600 nanometers wherein the first phosphor material has a luminance output at 25 degrees C. and a decreased luminance output at 50 degrees C. greater than 20 percent of the luminance output at 25 degrees C. The phosphor material comprises a second phosphor layer overlaying the first phosphor layer having a thickness less than 400 nanometers wherein the decreased luminance output at 50 degrees C. is less than 20 percent with the second phosphor layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.