Facile dimerization strategy for producing narrowband green multi-resonance delayed fluorescence emitters

Minlang Yang, Rajendra Kumar Konidena, So Shikita, Takuma Yasuda

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Establishing a simple molecular design strategy for enabling redshifted emissions while maintaining high color purity in multi-resonance thermally activated delayed fluorescence (MR-TADF) remains a crucial yet challenging task. Herein, we introduce a new design concept based on a dimerization strategy for constructing pure green MR-TADF emitters. Two isomeric MR dimers, namely p-CzB and m-CzB, were developed by tethering two MR fragments through different linking positions. The interconnection mode between the two MR fragments in these dimeric MR-TADF systems plays a vital role in regulating photophysical properties as well as exciton dynamics. Comprehensive photophysical and computational studies revealed that m-CzB exhibits superior green MR-TADF characteristics compared to p-CzB. A m-CzB-based organic light-emitting diode (OLED) delivered pure green electroluminescence with CIE coordinates of (0.20, 0.70), a maximum external quantum efficiency of 23.5%, and alleviated efficiency roll-off.

Original languageEnglish
Pages (from-to)917-922
Number of pages6
JournalJournal of Materials Chemistry C
Volume11
Issue number3
DOIs
Publication statusPublished - Nov 30 2022

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Materials Chemistry

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