Versatile Direct Cyclization Constructs Spiro‐acridan Derivatives for Highly Efficient TADF emitters

作者：Liu He; Liu Zhiwen; Li Ganggang; Huang Huaina; Zhou Changjiang; Wang Zhiming; Yang Chuluo

来源：Angewandte Chemie, 2021, 133(22): 12484-12488.

DOI：10.1002/ANGE.202103187

• cyclization
• organic light-emitting diodes
• sprio-acridan
• thermally activated delayed fluorescence

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.

• 单位
  华南理工大学