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Simultaneous enhancement of efficiency and stability of OLEDs with thermally activated delayed fluorescence materials by modifying carbazoles with peripheral groups

  • Yunge Zhang
  • Dongdong Zhang
  • Taiju Tsuboi
  • Yong Qiu
  • Lian DuanEmail author
Articles
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Abstract

Albeit their high efficiencies, the operational stability of the organic light emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) emitters is still far from satisfaction, and few strategies have been proposed to improve their stability. Here, we show that by modifying the carbazole unit, one of the most commonly used donors in TADF emitters, with peripheral groups, both the device efficiency and operational stability can be greatly improved. A well-known TADF molecule— 4,5-di(9H-carbazol-9-yl)phthalonitrile (2CzPN) was chosen as the prototype and modified by introducing peripheral tert-butyl and phenyl groups to the 3,6-positions of the carbazole (named 2tBuCzPN and 2PhCzPN, respectively). The introduced groups not only improve the compounds’ electrochemical stabilities referred to the cyclic voltammetry multi-sweep results, but also promote their photoluminescence quantum yields. Furthermore, reduced singlet-triplet energy gaps are observed, leading to the shortened exciton lifetimes which are benefit to suppress the exciton annihilations. Besides, the steric hindrance of introduced phenyl groups can partly restrain the concentration quenching of the TADF emitter. Consequently, OLEDs based on 2tBuCzPN and 2PhCzPN achieved improved maximum external quantum efficiencies (EQEs) of 17.0% and 14.0%, respectively (compared to 8.5% for 2CzPN). Meanwhile, 2PhCzPN based OLED showed reduced roll-off characteristics and a longer lifetime of 7.8 times higher than that of 2CzPN, testifying the effectiveness of subtle modification of the unstable moieties in simultaneous enhancement of efficiency and stability of OLEDs based on TADF emitters.

Keywords

TADF OLED stability carbazole peripheral group 

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Notes

Acknowledgements

This work was supported by the National Key Research and Development Program of China (2017YFA0204501), and the National Science Fund of China (51525304, 61890942, U1601651).

Supplementary material

11426_2018_9413_MOESM1_ESM.pdf (977 kb)
Supplementary material, approximately 228 KB.

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yunge Zhang
    • 1
  • Dongdong Zhang
    • 1
  • Taiju Tsuboi
    • 2
  • Yong Qiu
    • 1
  • Lian Duan
    • 1
    Email author
  1. 1.Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of ChemistryTsinghua UniversityBeijingChina
  2. 2.Department of Polymer Science and EngineeringZhejiang UniversityHangzhouChina

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