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Versatile Direct Cyclization Constructs Spiro‐acridan Derivatives for Highly Efficient TADF emitters
Author(s) -
Liu He,
Liu Zhiwen,
Li Ganggang,
Huang Huaina,
Zhou Changjiang,
Wang Zhiming,
Yang Chuluo
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202103187
Subject(s) - oled , quantum yield , quantum efficiency , fluorescence , diode , combinatorial chemistry , yield (engineering) , materials science , nanotechnology , optoelectronics , chemistry , physics , layer (electronics) , quantum mechanics , metallurgy
Spiro‐acridan (SpA) derivatives possess a great potential in preparing efficient thermally activated delayed fluorescent (TADF) emitters. However, the conventional synthetic routes are cost‐expensive and time‐consuming. The development of a simple procedure to synthesize SpAs is still in urgent pursuing appreciated by academic and industrial communities. In this contribution, we present a feasible acid‐catalyzed solvent‐free metal‐free cyclization between diarylamines and ketones to construct SpAs. The as‐constructed moieties provide a wide possibility to assemble efficient TADF emitters. As an example, D2T‐TR with high photoluminescent quantum yield and proper TADF character is applied in organic light emitting diodes (OLEDs) which achieves a maximum external quantum efficiency (EQE) of 27.1 %. This work shows us a bright inspiration on developing excellent organic optoelectronic materials and an effective tool to realize it.