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Donor/Acceptor Pairs Created by Electrostatic Interaction: Design, Synthesis, and Investigation on the Exciplex Formed Within the Pair
Author(s) -
He Lei,
Bai Rubing,
Yu Renyou,
Meng Xianwen,
Tian Mingxing,
Wang Xiaoxiang
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202013332
Subject(s) - excimer , acceptor , cationic polymerization , photochemistry , luminescence , carbazole , fluorescence , chemistry , oled , materials science , nanotechnology , polymer chemistry , optoelectronics , optics , physics , layer (electronics) , condensed matter physics
Exciplexes formed between donors and acceptors have been widely explored but isolating them from each other and tuning the interaction between the donor and acceptor have remained challenges. Here, we report donor/acceptor (D/A) pairs created by electrostatic interaction between a carbazole‐based anionic donor and a 1,3,5‐triazine‐based cationic acceptor and the exciplex formed within the pair. In a diluted film, the D/A pair affords an isolated exciplex which shows thermally activated delayed fluorescence (TADF). By changing the anchoring position of the imidazolium cation in the cationic acceptor, interactions between the donor and acceptor can be changed. Compared to the conventional exciplex formed in a neat film, the isolated exciplex exhibits a substantially higher luminescence efficiency. The D/A pairs show intriguing mechanochromic luminescence and mechanical grinding‐induced/reinforced TADF in the solid state and promising performances as emitters in organic light‐emitting diodes.