2019年11月22日
Pentacyclic Ladder-Heteraborin Emitters Exhibiting High-Efficiency Blue Thermally Activated Delayed Fluorescence with an Ultrashort Emission Lifetime
ACS Materials Letters
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- 巻
- 2
- 号
- 開始ページ
- 28
- 終了ページ
- 34
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acsmaterialslett.9b00433
- 出版者・発行元
- ACS
As one of the three primary colors, blue is significant for display and lighting applications and the development of blue-emitting molecules with high quantum efficiency, and color purity for organic light-emitting diodes (OLEDs) remains a key challenge. Herein, a new series of blue thermally activated delayed fluorescence (TADF) materials featuring π-extended ladder-oxaborin and thiaborin acceptors has been developed. Steady-state and time-resolved photophysical measurements revealed the advantages of the ladder-oxaborin emitter, including a tiny singlet–triplet energy splitting of 10 meV, an ideal photoluminescence quantum yield of 100%, and an ultrashort TADF lifetime of 780 ns. The TADF-OLEDs incorporating the ladder-oxaborin (deep-blue) and thiaborin (sky-blue) emitters achieved significantly high external electroluminescence quantum efficiencies of up to 20.1% and 25.9%, respectively, accompanied by suppressed efficiency roll-offs.
- ID情報
-
- DOI : 10.1021/acsmaterialslett.9b00433
- ISSN : 2639-4979
- ORCIDのPut Code : 65008742