期刊
ORGANIC ELECTRONICS
卷 75, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.orgel.2019.105404
关键词
OLED; Blue-emission; HLCT; Excited state; Spin-statics
资金
- National Natural Science Foundation of China [51803071, 51673083, 51873077, 91833304, 51625301, 51573059]
- National Basic Research Program of China [2015CB655003, 2016YFB0401001]
- Postdoctoral Innovation Talent Support Project [BX20170097, BX20180121]
- China Postdoctoral Science Foundation [2017M620108, 2018M641767, 2019TD-33]
- Guangdong Provincial Department of Science and Technology [2016B090906003, 2016TX03C175]
Introducing charge-transfer (CT) excited state components is an important method to enhancing the electroexciton utilization (eta(s)) to break the 25% spin-statistic limit. Herein, based on two locally-excited (LE) backbone materials that are of limited eta(s), we reported two materials with the introduction of assistant acceptor cyanophenyl ring to induce larger charge-separation on the backbone materials and construct proper hybrid local and charge-transfer (HLCT) excited state. Theoretical and experimental characterizations are carried out to explore the excited state and photophysical properties of the two materials. The eta(s )of the non-doped OLED of the two materials both exceed the 25% spin-statistic limit, in which the CT dominated material TPM2CN demonstrates a large eta(s) of 72%, showing great potential for the next-generation blue-emissive material. This work gives a good example for the construction of HLCT blue-emissive materials by discussing and summarizing the details of molecular design method of assistant acceptor.
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