Light extraction sheet, organic electroluminescence element and illumination device
US9541681B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2011 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | Mar 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K50/854
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a novel light extraction sheet, which not only improves light extraction efficiency but suppresses color change with the angle of observation, an organic EL element employing this light extraction sheet, and an illumination device employing the element. The light extraction sheet is featured in that it comprises a transparent resin film and provided thereon, a light scatter layer containing a binder resin and light scattering particles with an average particle size of front 0.2 to 1.0 μm dispersed in the binder resin and a concavo-convex layer containing a binder resin and spherical particles with an average particle size of from 3 to 10 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.