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NIR Luminescence from Deep-Level Traps in CsPbBr3 Microcrystals.

Jonathan Vandenwijngaerden1, Bapi Pradhan1, Bob Van Hout1

  • 1Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.

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This summary is machine-generated.

Researchers observed near-infrared (NIR) emission in cesium lead halide perovskite microcrystals. This emission originates from deep trap states, revealing new insights into perovskite recombination pathways.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Optoelectronics

Background:

  • All-inorganic perovskites like CsPbBr3 and CsPb(Br/Cl)3 are promising optoelectronic materials.
  • Understanding their excited-state dynamics and emission properties is crucial for device applications.

Purpose of the Study:

  • To report the first observation of near-infrared (NIR) emission in CsPbBr3 and CsPb(Br/Cl)3 perovskite microcrystals.
  • To investigate the origin and characteristics of this NIR emission.
  • To quantitatively determine the quantum yield and dynamics of this emission pathway.

Main Methods:

  • Temperature- and power-dependent NIR and visible luminescence spectroscopy.
  • Time-resolved luminescence spectroscopy (picosecond-to-nanosecond timescale).

Main Results:

  • Observation of a broadband NIR emission band in CsPbBr3 and CsPb(Br/Cl)3 microcrystals.
  • Demonstration that NIR emission arises from radiative transitions involving deep trap states.
  • Quantitative determination of the deep trap emission quantum yield (~0.3% at room temperature).
  • Observation of NIR state population on a 660 ps timescale, consistent with carrier capture by deep traps.

Conclusions:

  • Deep trap states contribute to radiative recombination in metal halide perovskite microcrystals.
  • This study reveals previously unexplored recombination channels in these materials.
  • The findings enhance the fundamental understanding of perovskite photophysics and potential applications.