Issue 20, 2024

Modulation of the near-infrared-I and -II luminescence of thulium-incorporated lead-free double perovskites

Abstract

Currently, lanthanide-doped metal halide perovskites with near-infrared (NIR) luminescence are receiving considerable attention. However, they suffer from low NIR efficiency, particularly in the NIR-II emission range, and are primarily excited by high-energy ultraviolet light. In this work, high-performance NIR-I and -II emissions were realized by co-doping a Cs2NaInCl6 lattice with Tm3+ ions as luminescent emitters and Sb3+ and Te4+ ions as sensitizer ions, where Sb3+ ions can enable short-wavelength high-energy excitation and Te4+ ions can enable long-wavelength blue-light excitation. The NIR photoluminescence quantum yield (PLQY) reaches an unprecedented 58.0% in Cs2NaInCl6:Sb3+/Tm3+ (NIR-II emission: 1224 nm–48.9%), which is attributed to the presence of the 1G4 energy level of the Tm3+ ion acting as a bridge, efficiently transferring energy from high-energy states of Sb3+ to NIR-emissive states. Moreover, Tm3+ ions can be sensitized by Te4+ ions that have broadband absorption in the blue region, which enable a high NIR PLQY of 10.3% in Cs2NaInCl6:Te4+/Tm3+ under 420 nm excitation. The excellent NIR luminescence performance combined with excellent environmental stability endows Cs2NaInCl6:Sb3+/Tm3+ and Cs2NaInCl6:Te4+/Tm3+ with considerable potential for application in night-vision devices.

Graphical abstract: Modulation of the near-infrared-I and -II luminescence of thulium-incorporated lead-free double perovskites

Supplementary files

Article information

Article type
Research Article
Submitted
16 jul. 2024
Accepted
28 ago. 2024
First published
30 ago. 2024

Inorg. Chem. Front., 2024,11, 6960-6969

Modulation of the near-infrared-I and -II luminescence of thulium-incorporated lead-free double perovskites

J. Nie, W. Ying, R. Cao, S. Liu, S. Qiu, C. Liao, X. Yun, B. Lan and J. Wang, Inorg. Chem. Front., 2024, 11, 6960 DOI: 10.1039/D4QI01772B

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