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Yanmei He. Portrait.

Yanmei He

Postdoctoral fellow

Yanmei He. Portrait.

Unveiling Mechanism of Temperature-Dependent Self-Trapped Exciton Emission in 1D Hybrid Organic–Inorganic Tin Halide for Advanced Thermography

Author

  • Yanmei He
  • Xinyi Cai
  • Xiaochen Wang
  • Mikkel Baldtzer Liisberg
  • Jakub Dostál
  • Muyi Zhang
  • Miroslav Kloz
  • Feng Gao
  • Tönu Pullerits
  • Junsheng Chen

Summary, in English

Lead-free hybrid metal halide phosphors/crystals showing self-trapped exciton (STE) emission have been recently explored for thermography due to the strong temperature dependence of their photoluminescence (PL) lifetime (τ). However, realizing high-spatial-resolution thermography using polycrystalline powders or crystals presents a challenge. Moreover, the underlying mechanism of temperature-dependent STE remains elusive. Herein, a homogeneous 1D ODASn2I6 (ODA, 1,8-octanediamine) nm-scale thin film exhibiting efficient STE emission is investigated. The PL decay shows a strong temperature dependence from 275 K (τ ≈ 1.31 µs) to 350 K (τ ≈ 0.65 µs) yielding a thermal sensitivity of 0.014 K−1. By employing temperature-dependent transient absorption spectroscopy, detailed information is obtained about the relaxation processes prior to the STE formation. Simultaneous analyses of steady-state and time-resolved spectroscopies lead to a self-consistent model where the thermally activated phonon-assisted nonradiative pathway explains the temperature dependence of the PL lifetime via a conical intersection between the ground state and STE potential energy surfaces. Finally, a discernible 50 ns variation in PL lifetimes across different heated regimes over a distance of 1.15 mm is successfully demonstrated with fluorescence lifetime imaging microscopy, underscoring the substantial potential of ODASn2I6 thin film for high-spatial-resolution thermography.

Department/s

  • LU Profile Area: Light and Materials
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • LTH Profile Area: Photon Science and Technology

Publishing year

2025

Language

English

Publication/Series

Advanced Optical Materials

Volume

13

Issue

2

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Materials Chemistry
  • Physical Chemistry (including Surface- and Colloid Chemistry)
  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • exciton dynamics
  • hybrid organic–inorganic tin halide
  • self-trapped exciton
  • thermography
  • ultrafast spectroscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 2195-1071