Anthracene-based fluorescent emitters toward superior-efficiency nondoped TTA-OLEDs with deep blue emission and low efficiency roll-off

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

9 Scopus Citations
View graph of relations

Author(s)

  • Longjiang Xing
  • Jia He
  • Zhipeng Qiu
  • Zhiwen Yang
  • Dan Lin
  • Qingdan Yang
  • Shaomin Ji
  • Yanping Huo

Detail(s)

Original languageEnglish
Article number127748
Journal / PublicationChemical Engineering Journal
Volume421
Issue numberpt. 2
Online published20 Nov 2020
Publication statusPublished - 1 Oct 2021

Abstract

Three new anthracene-based emitters, 4-(10-(9,9′-spirobi[fluoren]-2-yl)anthracen-9-yl)benzonitrile (SBF-AnCN), 4-(10-(9,9-diphenyl-9H-fluoren-2-yl)anthracen-9-yl)benzonitrile (DPF-AnCN) and 4-(10-(9,9-dimethyl-9H-fluoren-2-yl)anthracen-9-yl)benzonitrile (DMF-AnCN) are developed for deep blue organic light-emitting diodes (OLEDs). Their photophysical properties, thermal properties, molecular configurations and device performances have been systematically investigated. As verified by crystallographic study, these anthracene derivatives possess highly twisted configuration, leading to deep-blue light emission by restraining π-conjugation extension. Furthermore, the difference in the molecular packing manner may influence the photoluminescence quantum yields (PLQYs) in solid state and the proportion of singlet exciton harvested by triplet–triplet annihilation (TTA) process. A nondoped device fabricated using DPF-AnCN as emitter exhibits a maximum external quantum efficiency (EQE) of 7.1% with insignificant efficiency roll-off (6.6%@1000 nit) and Commission Internationale de L'Eclairage (CIE) index of (0.149, 0.104), approaching the standard blue index of the National Television System Committee (NTSC) of (0.14, 0.08). It is demonstrated that TTA is responsible for the excellent electroluminescence (EL) performance. In comparison with doped OLEDs, transient EL decay measurements demonstrate that TTA process is more efficient in the nondoped device. This work would provide an efficient method for designing deep-blue nondoped EL materials.

Research Area(s)

  • Anthracene-based derivatives, Deep-blue emission, Organic electroluminescence, Triplet–triplet annihilation

Citation Format(s)

Anthracene-based fluorescent emitters toward superior-efficiency nondoped TTA-OLEDs with deep blue emission and low efficiency roll-off. / Xing, Longjiang; Zhu, Ze-Lin; He, Jia; Qiu, Zhipeng; Yang, Zhiwen; Lin, Dan; Chen, Wen-Cheng; Yang, Qingdan; Ji, Shaomin; Huo, Yanping; Lee, Chun-Sing.

In: Chemical Engineering Journal, Vol. 421, No. pt. 2, 127748, 01.10.2021.

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