Temperature-dependent photoluminescence of CsPbBr3 nanocrystals

Inorganic perovskite CsPbBr3 has excellent optical properties such as high photoluminescence quantum yield (PLQY), strong light absorption, adjustable band gap, narrow band emission, etc., and has wide application prospects in light emitting diodes, photodetectors, lasers and solar cells. In this paper, CsPbBr₃ nanocrystals (NCs) was synthesized by ligand-assisted reprecipitation (LARP) method, and the pump fluence and temperature-dependent photoluminescence (PL) properties of CsPbBr₃ NCs were studied by steady-state PL combined with spectral analysis and the existence of single-photon absorption was proved. The PL intensity decreases with the increase of temperature, the peak position of PL blue shifts with the increase of temperature, and the larger exciton binding energy is conducive to promoting radiation recombination. The longitudinal optical phonon energy of CsPbBr3 NCs is 28.8 meV, and the material has good thermal stability.