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Charging and ultralong phosphorescence of lanthanide facilitated organic complex

Author

Listed:
  • Waygen Thor

    (Hong Kong Baptist University)

  • Yue Wu

    (Hong Kong Baptist University)

  • Lei Wang

    (Hong Kong Baptist University)

  • Yonghong Zhang

    (Hong Kong Baptist University
    Xinjiang University)

  • Peter A. Tanner

    (Hong Kong Baptist University)

  • Ka-Leung Wong

    (Hong Kong Baptist University)

Abstract

Emission from the triplet state of an organo-lanthanide complex is observed only when the energy transfer to the lanthanide ion is absent. The triplet state lifetime under cryogenic conditions for organo-lanthanide compounds usually ranges up to tens of milliseconds. The compound LaL1(TTA)3 reported herein exhibits 77 K phosphorescence observable by the naked eye for up to 30 s. Optical spectroscopy, density functional theory (DFT) and time-dependent DFT techniques have been applied to investigate the photophysical processes of this compound. In particular, on-off continuous irradiation cycles reveal a charging behaviour of the emission which is associated with triplet-triplet absorption because it shows a shorter rise lifetime than the corresponding decay lifetime and it varies with illumination intensity. The discovery of the behaviour of this compound provides insight into important photophysical processes of the triplet state of organo-lanthanide systems and may open new fields of application such as data encryption, anti-counterfeiting and temperature switching.

Suggested Citation

  • Waygen Thor & Yue Wu & Lei Wang & Yonghong Zhang & Peter A. Tanner & Ka-Leung Wong, 2021. "Charging and ultralong phosphorescence of lanthanide facilitated organic complex," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26927-z
    DOI: 10.1038/s41467-021-26927-z
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    References listed on IDEAS

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    1. Zesen Lin & Ryota Kabe & Kai Wang & Chihaya Adachi, 2020. "Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
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