Electroluminescent element and method of producing the same
US6575800B1 · kind B1 · utility
34Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1999 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Jul 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K59/35
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electroluminescent element and method for manufacturing the same including an anode, a cathode, and a light emitting layer disposed in a plane between the anode and the cathode. The light emitting layer containing a fluorescent first compound, and at least a portion of the light emitting layer also containing a second compound which absorbs a first fluorescence generated by the first compound and emits a second fluorescence of a longer wavelength than the first fluorescence. The concentration of the second compound has a gradient along a thickness direction of the light emitting layer perpendicular to the plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.