Molecular Engineering Enables TADF Emitters Well Suitable for Non-Doped OLEDs with External Quantum Efficiency of Nearly 30%

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ziyang Xie
  • Yang Zou
  • Xiaosong Cao
  • Changjiang Zhou
  • Jiawei He
  • Chuluo Yang

Detail(s)

Original languageEnglish
Article number2112881
Journal / PublicationAdvanced Functional Materials
Volume32
Issue number19
Online published4 Feb 2022
Publication statusPublished - 9 May 2022

Abstract

Non-doped organic light-emitting diodes (OLEDs) are particularly appealing due to the merit of the extremely simple device structure. However, the performance of non-doped OLEDs is usually far inferior than that of doped devices, mainly due to the lack of desirable emitters. An ideal emitter for non-doped OLEDs should not merely be highly emissive in the host matrix but also be capable of delivering excellent properties in its condensed state. Herein, through molecular engineering, an “axial and equatorial carbazolyl extension” approach to manipulate the molecular packing behavior is developed, and thus, the emitter is awarded with superior properties in its neat film. Based on this approach, through simply modifying the conventional acridine donor in a thermally activated delayed fluorescence (TADF) emitter with carbazole moieties in the way of hyper-conjugation, two new TADF emitters with the molecular skeleton being extended both horizontally and vertically by carbazole moieties are constructed. The resulted TADF emitters reveal superb properties with simultaneous excellent thermal and morphological stabilities, photophysical behaviors, and charge transporting ability in their neat film. Owing to the merits of these synergistic superior properties, highly efficient non-doped green emissive OLED with the state-of-the-art external quantum efficiency of nearly 30% is realized.

Research Area(s)

  • carbazole, electron donors, non-doped, organic light-emitting diodes, thermally activated delayed fluorescence

Citation Format(s)