Rational Molecular Design Strategy for High-Efficiency Ultrapure Blue TADF Emitters : Symmetrical and Rigid Sulfur-Bridged Boron-Based Acceptors

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

11 Scopus Citations
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Author(s)

  • Honglei Gao
  • Zhiyi Li
  • Zhi Pang
  • Yuanyuan Qin
  • Guanhao Liu
  • Teng Gao
  • Xiangyu Dong
  • Shaogang Shen
  • Xin Xie
  • Pengfei Wang
  • Ying Wang

Detail(s)

Original languageEnglish
Pages (from-to)5529−5537
Journal / PublicationACS Applied Materials & Interfaces
Volume15
Issue number4
Online published21 Jan 2023
Publication statusPublished - 1 Feb 2023

Abstract

Developing highly efficient blue thermally activated delayed fluorescence (TADF) emitters with a narrowband emission is still a challenge. Here, novel ultrapure blue TADF emitters of TSBA-Cz and TSBA-PhCz were designed and synthesized for organic light-emitting diodes (OLEDs). Photophysical and time-dependent density functional theory calculation results simultaneously show the similar intramolecular charge-transfer character of MR-type TADF emitters. Benefiting from the symmetrical and rigid molecular configuration, compounds TSBA-Cz and TSBA-PhCz emit a pure blue emission peak at 463 and 470 nm, a narrow full width at half-maximum (FWHM) of 30 and 36 nm, and a small singlet-triplet energy gap (ΔEST) of 0.21 and 0.18 eV, respectively, facilitating their excellent TADF behavior in doped films. Furthermore, highly efficient TADFOLED devices using the TSBA-Cz and TSBA-PhCz with external quantum efficiencies of 23.4 and 21.3% emit ultrapure blue electroluminescence (EL) at 464 and 472 nm with a narrow FWHM of about 35 nm and CIE color coordinates of (0.14, 0.11) and (0.12, 0.18). This work provides novel TADF emitters for blue OLEDs with narrowband EL. © 2023 American Chemical Society.

Research Area(s)

  • organic light-emitting devices, thermally activated delayed fluorescence, multiple-resonance effect, small FWHM, ultrapure blue electroluminescence, ACTIVATED DELAYED FLUORESCENCE, LIGHT-EMITTING-DIODES, ORGANIC EMITTERS

Citation Format(s)

Rational Molecular Design Strategy for High-Efficiency Ultrapure Blue TADF Emitters: Symmetrical and Rigid Sulfur-Bridged Boron-Based Acceptors. / Gao, Honglei; Li, Zhiyi; Pang, Zhi et al.
In: ACS Applied Materials & Interfaces, Vol. 15, No. 4, 01.02.2023, p. 5529−5537.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review