Two novel efficient blue thermally activated delayed fluorescence (TADF) emitters, Ac-OPO and Ac-OSO, consisting of phenoxaphosphine oxide and phenoxathiin dioxide as acceptor units and dimethylacridan as a donor unit, have been developed. Maximum Next values of 12.3% and 20.5% were achieved in blue TADF-OLEDs by employing Ac-OPO and Ac-OSO as TADF emitters, respectively. Moreover, the Ac-OSO-based blue-emitting device exhibits a very weak efficiency roll-off with Next over 13% even a luminance of 1000 cd m-2. These results demonstrate that blue TADF emitters can provide new prospects as an attractive alternative to conventional blue fluorescent and phosphorescent materials in the future.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering