期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 49, 页码 17739-17742出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b10257
关键词
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资金
- National Natural Science Foundation of China [51573182, 51203149, 91333205]
- National Key Research and Development Program [2017YFB0404402, 2016YFB0401301]
- 973 Project [2015CB655000]
We demonstrate novel molecular design for thermally activated delayed fluorescence (TADF) polymers based on a nonconjugated polyethylene backbone with through-space charge transfer effect between pendant electron donor (D) and acceptor (A) units. Different from conventional conjugated D-A polymers with through bond charge transfer effect, the nonconjugated architecture avoids direct conjugation between D and A units, enabling blue emission. Meanwhile, spatial pi-pi interaction between the physically separated D and A units results in both small singlet-triplet energy splitting (0.019 eV) and high photoluminescence quantum yield (up to 60% in film state). The resulting polymer with 5 mol % acceptor unit gives efficient blue electroluminescence with Commission Internationale de l'Eclairage coordinates of (0.176, 0.269), together with a high external quantum efficiency of 12.1% and low efficiency roll-off of 4.9% (at 1000 cd m(-2)), which represents the first example of blue TADF nonconjugated polymer.
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