Organic EL element with light extraction and light emission efficiency
US9059420B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2012 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Nov 7, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An organic EL element includes a transparent supporting substrate; a diffraction grating having a concavity and convexity layer with first concavities and convexities formed on a surface thereof, disposed on the transparent supporting substrate; and a transparent electrode, an organic layer having at least a light emitting layer, and a metal electrode having second concavities and convexities on a surface facing organic layer, which are stacked in this order on the diffraction grating and formed into such shapes such that a shape of the first concavities and convexities is maintained, wherein conditions (A), (B) and (C) respectively relating to a Fourier transformed, standard deviations pertaining to depth distributions for first and second concavities and convexities, and a ratio of the change in standard deviation of depth distribution of the second concavities and convexities relative to depth distributions of the first concavities and convexities are satisified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.