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Highly efficient green organic light-emitting devices based on terbium complex by employing hole block material as host

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Abstract

In this work, efficient green electroluminescent (EL) devices with simplified device structure were prepared by doping trivalent terbium complex Tb(PMIP)3 into hole block material TmPyPB. The high triplet energy of TmPyPB helps to confine excitons within light-emitting layer, while the electron transport characteristic of TmPyPB facilitates the balance of carriers on Tb(PMIP)3 molecules. By optimizing the doping concentration of Tb(PMIP)3 and the thickness of each functional layer, highly efficient green EL device with the structure of ITO/MoO3 (3 nm)/TAPC (50 nm)/Tb(PMIP)3 (30 wt%):TmPyPB (25 nm)/TmPyPB (60 nm)/LiF (1 nm)/Al (100 nm) displayed pure Tb3+ characteristic emission with maximum current efficiency, power efficiency and brightness up to 47.24 cd/A (external quantum efficiency (EQE) of 14.4%), 43.63 lm/W and 1694 cd/m2, respectively. At certain brightness of 100 cd/m2, the device still maintained a current efficiency of 19.96 cd/A (EQE=6.1%). Such a device design strategy helps to improve the EL performances of Tb(PMIP)3 and to simplify device fabrication processes, thus reduce the fabrication cost.

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Authors and Affiliations

  1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    XueSen Zhao, Liang Zhou, Qi Zhu & HongJie Zhang

  2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China

    ZiFeng Zhao, ZhiWei Liu, ZuQiang Bian & ChunHui Huang

Authors
  1. XueSen Zhao
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  2. ZiFeng Zhao
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  3. Liang Zhou
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  4. Qi Zhu
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  5. ZhiWei Liu
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  6. ZuQiang Bian
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  7. ChunHui Huang
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  8. HongJie Zhang
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Corresponding authors

Correspondence to Liang Zhou or ZuQiang Bian.

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Zhao, X., Zhao, Z., Zhou, L. et al. Highly efficient green organic light-emitting devices based on terbium complex by employing hole block material as host. Sci. China Technol. Sci. 61, 1334–1339 (2018). https://doi.org/10.1007/s11431-018-9276-7

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  • DOI: https://doi.org/10.1007/s11431-018-9276-7

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