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Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes

Author

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  • Jiayi Li

    (Peking University)

  • Liding Wang

    (Peking University)

  • Zifeng Zhao

    (Peking University)

  • Boxun Sun

    (Peking University)

  • Ge Zhan

    (Peking University)

  • Huanyu Liu

    (Peking University)

  • Zuqiang Bian

    (Peking University)

  • Zhiwei Liu

    (Peking University)

Abstract

Divalent europium 5d-4f transition has aroused great attention in many fields, in a way of doping Eu2+ ions into inorganic solids. However, molecular Eu2+ complexes with 5d-4f transition are thought to be too air-unstable to explore their applications. In this work, we synthesized four Eu2+-containing azacryptates EuX2-Nn (X = Br, I, n = 4, 8) and systematically studied the photophysical properties in crystalline samples and solutions. Intriguingly, the EuX2-N8 complexes exhibit near-unity photoluminescence quantum yield, good air-/thermal-stability and mechanochromic property (X = I). Furthermore, we proved the application of Eu2+ complexes in organic light-emitting diodes (OLEDs) with high efficiency and luminance. The optimized device employing EuI2-N8 as emitter has the best performance as the maximum luminance, current efficiency, and external quantum efficiency up to 25470 cd m−2, 62.4 cd A−1, and 17.7%, respectively. Our work deepens the understanding of structure-property relationship in molecular Eu2+ complexes and could inspire further research on application in OLEDs.

Suggested Citation

  • Jiayi Li & Liding Wang & Zifeng Zhao & Boxun Sun & Ge Zhan & Huanyu Liu & Zuqiang Bian & Zhiwei Liu, 2020. "Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19027-x
    DOI: 10.1038/s41467-020-19027-x
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    Cited by:

    1. Tolulope Michael Ajayi & Vijay Singh & Kyaw Zin Latt & Sanjoy Sarkar & Xinyue Cheng & Sineth Premarathna & Naveen K. Dandu & Shaoze Wang & Fahimeh Movahedifar & Sarah Wieghold & Nozomi Shirato & Volke, 2022. "Atomically precise control of rotational dynamics in charged rare-earth complexes on a metal surface," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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