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Recent progress in thermally activated delayed fluorescence emitters for nondoped organic light-emitting diodes

Chemical science (Cambridge), 2022-03, Vol.13 (13), p.3625-3651 [Peer Reviewed Journal]

This journal is © The Royal Society of Chemistry. ;Copyright Royal Society of Chemistry 2022 ;This journal is © The Royal Society of Chemistry 2022 The Royal Society of Chemistry ;ISSN: 2041-6520 ;EISSN: 2041-6539 ;DOI: 10.1039/d1sc07180g ;PMID: 35432901

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  • Title:
    Recent progress in thermally activated delayed fluorescence emitters for nondoped organic light-emitting diodes
  • Author: Shi, Yi-Zhong ; Wu, Hao ; Wang, Kai ; Yu, Jia ; Ou, Xue-Mei ; Zhang, Xiao-Hong
  • Subjects: Chemistry ; Emitters ; Excitons ; Fluorescence ; Light emitting diodes ; Molecular structure ; Organic light emitting diodes ; Quantum efficiency ; Quenching
  • Is Part Of: Chemical science (Cambridge), 2022-03, Vol.13 (13), p.3625-3651
  • Description: Nondoped organic light-emitting diodes (OLEDs) have drawn immense attention due to their merits of process simplicity, reduced fabrication cost, etc. To realize high-performance nondoped OLEDs, all electrogenerated excitons should be fully utilized. The thermally activated delayed fluorescence (TADF) mechanism can theoretically realize 100% internal quantum efficiency (IQE) through an effective upconversion process from nonradiative triplet excitons to radiative singlet ones. Nevertheless, exciton quenching, especially related to triplet excitons, is generally very serious in TADF-based nondoped OLEDs, significantly hindering the pace of development. Enormous efforts have been devoted to alleviating the annoying exciton quenching process, and a number of TADF materials for highly efficient nondoped devices have been reported. In this review, we mainly discuss the mechanism, exciton leaking channels, and reported molecular design strategies of TADF emitters for nondoped devices. We further classify their molecular structures depending on the functional A groups and offer an outlook on their future prospects. It is anticipated that this review can entice researchers to recognize the importance of TADF-based nondoped OLEDs and provide a possible guide for their future development. The mechanism, exciton leaking channels, and reported molecular design strategies of TADF emitters for high-performance nondoped OLEDs are summarized. Their molecular structures depending on the functional A groups are further classified.
  • Publisher: England: Royal Society of Chemistry
  • Language: English
  • Identifier: ISSN: 2041-6520
    EISSN: 2041-6539
    DOI: 10.1039/d1sc07180g
    PMID: 35432901
  • Source: PubMed Central
    DOAJ Directory of Open Access Journals
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