Tri-Spiral Donor for High Efficiency and Versatile Blue Thermally Activated Delayed Fluorescence Materials.

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ID: 2395
2019
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Abstract
Blue thermally activated delayed fluorescence (TADF) emitters that can simultaneously achieve high efficiency in doped and nondoped organic light-emitting diodes (OLEDs) are rarely reported. Reported here is a strategy using a tri-spiral donor for such versatile blue TADF emitters. Impressively, by simply extending the nonconjugated fragment and molecular length, aggregation-caused emission quenching (ACQ) can be greatly alleviated to achieve as high as a 90 % horizontal orientation dipole ratio and external quantum efficiencies (EQEs) of up to 33.3 % in doped and 20.0 % in nondoped sky-blue TADF-OLEDs. More fascinatingly, a high-efficiency purely organic white OLED with an outstanding EQE of up to 22.8 % was also achieved by employing TspiroS-TRZ as a blue emitter and an assistant host. This compound is the first blue TADF emitter that can simultaneously achieve high electroluminescence (EL) efficiency in doped, nondoped sky-blue, and white TADF-OLEDs.
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li2019trispiralangewandte Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Wei;Li, Binbin;Cai, Xinyi;Gan, Lin;Xu, Zhida;Li, Wenqi;Liu, Kunkun;Chen, Dongcheng;Su, Shi-Jian;
Journal angewandte chemie (international ed in english)
Year 2019
DOI
10.1002/anie.201904272
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