Organic electroluminescent devices
US9735368B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2013 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Jun 24, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K85/6574
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An organic electroluminescent element that includes a light-emitting layer composed of a light-emitting composition containing at least one type of host material and at least one type of light-emitting material is provided. The host material is a fluorescent anthracene derivative, which fluoresces blue light under DC current with a current density of 25 mA/cm2. If λ (nm) is taken to be the shortest wavelength of all the wavelengths at which the intensity of PL emission of a film composed only of the aforementioned host material is one-half the maximum emission intensity, then the intensity of PL emission at the aforementioned wavelength λ of a film composed of the aforementioned light-emitting composition is no more than 1/10 the maximum emission intensity of PL emission of the film composed of the aforementioned light-emitting composition, and the PL emission of the film composed of the aforementioned light-emitting composition satisfies CIE y≦0.08.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.