| Title | Blue thermally activated delayed fluorescence emitters based on a constructing strategy with diversed donors and oxadiazole acceptor and their efficient electroluminescent devices |
| Authors | Tan, Yu Rui, Bin Li, Jiayi Zhao, Zifeng Liu, Zhiwei Bian, Zuqiang Huang, Chunhui |
| Affiliation | Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, BNLMS, Beijing 100871, Peoples R China |
| Keywords | Blue OLEDs TADF High efficiency Diversed donor Oxadiazole |
| Issue Date | 2019 |
| Publisher | OPTICAL MATERIALS |
| Abstract | A series of highly efficient blue emission compounds with D-A-D molecular structures were designed and synthesized, in which oxadiazole group was used as electronic acceptor (A), and carbazole/acridine groups as electronic donor (D). It is found that the compounds containing acridine both had small energy splitting between singlet excited state (S-1) and triplet excited state (T-1) (that is, Delta E-ST) and thus showed distinct thermally activated delayed fluorescence (TADF) characteristics. Moreover, they both had high photoluminescent quantum yields (PLQY) even up to 93%. In comparison, the compound only containing carbazole just showed prompt emission but no delayed fluorescence. The blue organic light-emitting diodes (OLEDs) using the TADF compounds as emitters achieved a high maximum external quantum efficiencies (EQE) up to 22.3% with Commission Internationale de L'e'clairage (CIE) coordinates of (0.16, 0.24). Triplet excitons were efficiently utilized in the device. The further optimized OLEDs achieved more outstanding comprehensive performance. |
| URI | http://hdl.handle.net/20.500.11897/546061 |
| ISSN | 0925-3467 |
| DOI | 10.1016/j.optmat.2019.05.040 |
| Indexed | SCI(E) EI |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ 稀土材料化学与应用国家重点实验室 |
