Revealing the new potential of an indandione unit for constructing efficient yellow thermally activated delayed fluorescence emitters with short emissive lifetimes

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

11 Scopus Citations
View graph of relations

Author(s)

  • Yepeng Xiang
  • Dongjun Xie
  • Shaolong Gong
  • Kailong Wu
  • Guohua Xie
  • Chuluo Yang

Detail(s)

Original languageEnglish
Pages (from-to)7111-7118
Journal / PublicationJournal of Materials Chemistry C
Volume6
Issue number26
Early online date16 Jun 2018
Publication statusPublished - 14 Jul 2018

Abstract

Simultaneously accomplishing a high efficiency and a slow efficiency roll-off at the practical luminance levels remains challenging for thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs). In this study, for the first time, we reveal new potential of indandione unit featuring double carbonyl moieties, which is widely used in organic solar cells, as an electron-accepting core for constructing efficient TADF emitters. As a proof of concept, two TADF emitters, 5PXZ-PIDO and 5,6PXZ-PIDO, are developed by connecting an indandione (IDO) core with electron-donating phenoxazine (PXZ) units via the phenylene π-bridges. Impressively, both emitters exhibit distinct TADF nature with short DF lifetimes of ~ 2 μs, and display relatively high photoluminescence quantum yields (ΦPLs) of over 70%. More importantly, a yellow OLED based on 5,6PXZ-PIDO achieves a high EQE of 14.2% and an ultra-slow efficiency roll-off of 16.0% at a practical luminance of 1000 cd m-2, which is outstanding among previously reported carbonyl-based TADF emitters. This finding unlocks the huge potential of indandione-based molecules as TADF emitters for high-performance OLEDs.

Citation Format(s)

Revealing the new potential of an indandione unit for constructing efficient yellow thermally activated delayed fluorescence emitters with short emissive lifetimes. / Xiang, Yepeng; Zhu, Ze-Lin; Xie, Dongjun; Gong, Shaolong; Wu, Kailong; Xie, Guohua ; Lee, Chun-Sing; Yang, Chuluo.

In: Journal of Materials Chemistry C, Vol. 6, No. 26, 14.07.2018, p. 7111-7118.

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