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Updated: Sep 29, 2025

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Theoretical perspective of relationship between molecular structure and luminescence properties for circularly
Yuzhi Song1, Ming Qin1, Songsong Liu1
1Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan, 250358, China.
Abstract:
Circularly polarized luminescence (CPL) molecules with thermally activated delayed fluorescence (TADF) features show promising applications in high-efficiency circularly polarized organic light emitting diodes (CP-OLEDs). Herein, a pair of chiral molecules (R)-ImNT and (S)-ImNT are studied, two kinds of conformations are found by molecular dynamic conformation search, namely the quasi-axial and the quasi-equatorial conformations. Moreover, molecule with quasi-axial conformation is conducive to achieve outstanding CPL properties due to the large contributions of chiral groups to natural transition orbitals. While the energy gaps for quasi-equatorial conformations are significantly reduced and spin-orbit coupling effects between them are obviously increased. In addition, the quasi-equatorial configuration can facilitate the reverse intersystem crossing process to achieve remarkable TADF feature. Relationships between molecular geometries and CPL as well as TADF properties are revealed. Our research elucidates the relationship between geometric structure and luminescence mechanism, which could provide valuable insights for the design of efficient CPL-TADF emitters.
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