Organic electroluminescent element
US11342506B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 17, 2019 |
| Grant date | May 24, 2022 |
| Priority date | — |
| Expiry date | Jun 26, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/80
Abstract
An organic electroluminescent element includes a light emitting layer containing a polycyclic aromatic compound represented by (1) or its multimer having plural structures represented by (1) and an anthracene-based compound represented by (3). In (1) and (3), rings A to C represent optionally substituted aryl rings or heteroaryl rings, X1 and X2 represent >O, >N—R, >C(—R)2, >S, or >Se, R in >N—R represents aryl etc., R in >C(—R)2 represents hydrogen etc., R in >N—R and/or R in >C(—R)2 may be bonded to ring A, B, and/or C via linking group or single bond, X's and Ar4's represent hydrogen or optionally substituted aryls, not all X's and Ar4's represent hydrogen simultaneously, and at least one hydrogen in compound represented by (1) or (3) may be substituted by halogen etc. In the light emitting layer, concentration of the polycyclic aromatic compound or its multimer changes from a positive electrode layer to a negative electrode layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.