Bright, efficient, and stable pure-green hyperfluorescent organic light-emitting diodes by judicious molecular design

Yi Ting Lee, Chin Yiu Chan, Nanami Matsuno, Shigetada Uemura, Susumu Oda, Masakazu Kondo, Rangani Wathsala Weerasinghe, Yanmei Hu, Gerardus N.Iswara Lestanto, Youichi Tsuchiya, Yufang Li, Takuji Hatakeyama, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

To fulfill ultra-high-definition display, efficient and bright green organic light-emitting diodes with Commission Internationale de l’Éclairage y-coordinate ≥ 0.7 are required. Although there are some preceding reports of highly efficient devices based on pure-green multi-resonance emitters, the efficiency rolloff and device stabilities for those pure-green devices are still unsatisfactory. Herein, we report the rational design of two pure-green multi-resonance emitters for achieving highly stable and efficient pure-green devices with CIEx,ys that are close to the NTSC and BT. 2020 standards. In this study, our thermally activated delayed fluorescence OLEDs based on two pure-green multi-resonance emitters result in CIEy up to 0.74. In hyperfluorescent device architecture, the CIExs further meet the x-coordinate requirements, i.e., NTSC (0.21) and BT. 2020 (0.17), while keeping their CIEys ~ 0.7. Most importantly, hyperfluorescent devices display the high maximum external quantum efficiencies of over 25% and maximum luminance of over 105 cd m−2 with suppressed rolloffs (external quantum efficiency of ~20% at 104 cd m−2) and long device stabilities with LT95s of ~ 600 h.

Original languageEnglish
Article number3174
JournalNature communications
Volume15
Issue number1
DOIs
Publication statusPublished - Dec 2024

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy

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