期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 13, 页码 8627-8636出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b12559
关键词
thioxanthone derivatives; intramolecular charge transfer; color tunable; thermally activated delayed fluorescence; organic light emitting diodes
资金
- Ministry of Science and Technology [2015CB655003, 2014DFA52030]
- National Natural Science Foundation of China [91233116, 51573059]
- Guangdong Provincial Department of Science and Technology [2014B090901048]
Thioxanthone derivatives consisting of undecorated carbazole as an electron donor and thioxanthone (TXO) or 9H-thioxanthen-9-one-S,S-dioxide (SOXO) as an electron acceptor in a donor acceptor (D-A) or donor acceptor donor (D-A-D) structure were developed as thermally activated delayed fluorescence emitters to fabricate highly efficient fluorescent organic light emitting diodes. Their emission color was successfully tuned from blue to yellow by changing the sulfur atom valence state of the thioxanthone unit to tune intramolecular charge transfer effect. Their thermal,. electro-chemical, photophysical, and electroluminescent properties, and theoretical calculations were systematically investigated to illustrate the molecular structure and property relationships. Maximum external quantum efficiency (EQE) of 13.6% with Commission Internationale de L'Eclairage coordinates of (0.37, 0.57) was achieved for green light emission CzSOXO consisting of SOXO and carbazole in a D-A structure. Blue light emission CzTXO and DCzTXO consisting of TXO and carbazole in a D A and D A D structure could also give EQE values exceeding 11%. Their efficiency roll-off with increasing current density was simulated by adopting triplet triplet annihilation model, indicating that the TXO derivatives suffer more severe efficiency roll-off because of their relatively long delayed fluorescence lifetime (tau(D)).
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