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Broadband infrared LEDs based on europium-to-terbium charge transfer luminescence

Author

Listed:
  • Jonas J. Joos

    (Ghent University
    Ghent University)

  • David Van der Heggen

    (Ghent University
    Ghent University)

  • Lisa I. D. J. Martin

    (Ghent University
    Ghent University)

  • Lucia Amidani

    (European Synchrotron Radiation Facility (ESRF)
    Helmholtz-Zentrum Dresden-Rossendorf)

  • Philippe F. Smet

    (Ghent University
    Ghent University)

  • Zoila Barandiarán

    (Universidad Autónoma de Madrid
    Universidad Autónoma de Madrid
    Universidad Autónoma de Madrid)

  • Luis Seijo

    (Universidad Autónoma de Madrid
    Universidad Autónoma de Madrid
    Universidad Autónoma de Madrid)

Abstract

Efficient broadband infrared (IR) light-emitting diodes (LEDs) are needed for emerging applications that exploit near-IR spectroscopy, ranging from hand-held electronics to medicine. Here we report broadband IR luminescence, cooperatively originating from Eu2+ and Tb3+ dopants in CaS. This peculiar emission overlaps with the red Eu2+ emission, ranges up to 1200 nm (full-width-at-half-maximum of 195 nm) and is efficiently excited with visible light. Experimental evidence for metal-to-metal charge transfer (MMCT) luminescence is collected, comprising data from luminescence spectroscopy, microscopy and X-ray spectroscopy. State-of-the-art multiconfigurational ab initio calculations attribute the IR emission to the radiative decay of a metastable MMCT state of a Eu2+-Tb3+ pair. The calculations explain why no MMCT emission is found in the similar compound SrS:Eu,Tb and are used to anticipate how to fine-tune the characteristics of the MMCT luminescence. Finally, a near-IR LED for versatile spectroscopic use is manufactured based on the MMCT emission.

Suggested Citation

  • Jonas J. Joos & David Van der Heggen & Lisa I. D. J. Martin & Lucia Amidani & Philippe F. Smet & Zoila Barandiarán & Luis Seijo, 2020. "Broadband infrared LEDs based on europium-to-terbium charge transfer luminescence," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17469-x
    DOI: 10.1038/s41467-020-17469-x
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    Cited by:

    1. Xin Zhang & Hao Suo & Yang Guo & Jiangkun Chen & Yu Wang & Xiaohe Wei & Weilin Zheng & Shuohan Li & Feng Wang, 2024. "Continuous tuning of persistent luminescence wavelength by intermediate-phase engineering in inorganic crystals," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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