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

Jonas J. Joos (), David Van der Heggen, Lisa I. D. J. Martin, Lucia Amidani, Philippe F. Smet, Zoila Barandiarán and Luis Seijo
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Jonas J. Joos: Ghent University
David Van der Heggen: Ghent University
Lisa I. D. J. Martin: Ghent University
Lucia Amidani: European Synchrotron Radiation Facility (ESRF)
Philippe F. Smet: Ghent University
Zoila Barandiarán: Universidad Autónoma de Madrid
Luis Seijo: Universidad Autónoma de Madrid

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-17469-x

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