High-Performance Nondoped Organic Light-Emitting Diode Based on a Thermally Activated Delayed Fluorescence Emitter with 1D Intermolecular Hydrogen Bonding Interactions

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

3 Scopus Citations
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Author(s)

  • Yi-Zhong Shi
  • Kai Wang
  • Xiao-Chun Fan
  • Jia-Xiong Chen
  • Xue-Mei Ou
  • Jia Yu
  • Jian-Sheng Jie
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Article number2100461
Journal / PublicationAdvanced Optical Materials
Volume9
Issue number16
Online published24 May 2021
Publication statusPublished - 18 Aug 2021

Abstract

Nondoped organic light-emitting diodes (OLEDs) have drawn enormous attention for their merits of process simplicity, reduced fabrication cost, and phase stability. Herein, a novel approach of utilizing intermolecular hydrogen bonding for enhancing performance of nondoped OLEDs with a new thermally activated delayed fluorescence (TADF) emitter 10-(4-(2,6-di(pyrimidin-5-yl)pyridin-4-yl)phenyl)-10H-phenoxazine (DPmP-PXZ) is investigated. Endowing with suitable intermolecular hydrogen bonds linking the ends of neighboring DPmP-PXZ molecules, the molecules tend to form extended 1D molecular chain in solid. This 1D structure effectively keeps the electron-rich PXZ cores in neighboring molecules apart from each other such that triplet-related exciton quenching can be well suppressed. In addition, it also improves the balance of carrier mobilities and the optical out-coupling from the emitting layer. With these merits, OLEDs using DPmP-PXZ as a dopant emitter, from 10 to 100 wt%, can maintain high external quantum efficiencies (EQEs) of over 20%. More importantly, its nondoped OLED shows a yellow emission and an excellent maximum EQE of 21.8% with little efficiency roll-off which is even comparable with state-of-the-art yellow OLEDs. These results provide new insight on the role of hydrogen bonding in molecular packing and its subsequent influences on the performance of OLEDs.

Research Area(s)

  • high efficiency, intermolecular hydrogen bonding, nondoped organic light-emitting diodes, restricted exciton annihilations, thermally activated delayed fluorescence

Citation Format(s)

High-Performance Nondoped Organic Light-Emitting Diode Based on a Thermally Activated Delayed Fluorescence Emitter with 1D Intermolecular Hydrogen Bonding Interactions. / Shi, Yi-Zhong; Wang, Kai; Fan, Xiao-Chun; Chen, Jia-Xiong; Ou, Xue-Mei; Yu, Jia; Jie, Jian-Sheng; Lee, Chun-Sing; Zhang, Xiao-Hong.

In: Advanced Optical Materials, Vol. 9, No. 16, 2100461, 18.08.2021.

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