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Temperature-dependent photoluminescence of CsPbX3 nanocrystal films

Han, Qiuju ; Wu, Wenzhi ; Liu, Weilong ; Yang, Qingxin ; Yang, Yanqiang

Journal of luminescence, 2018-06, Vol.198, p.350-356 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Temperature-dependent photoluminescence of CsPbX3 nanocrystal films
  • Autor: Han, Qiuju ; Wu, Wenzhi ; Liu, Weilong ; Yang, Qingxin ; Yang, Yanqiang
  • Assuntos: Band-edge exciton ; CsPbX3 ; Nanocrystals ; Photoluminescence ; Trapping state
  • É parte de: Journal of luminescence, 2018-06, Vol.198, p.350-356
  • Descrição: Temperature-dependent photoluminescence (PL) properties of all-inorganic perovskite CsPbX3 (X=Cl, Br, I, or their mixtures) nanocrystal (NC) films are studied by use of steady-state and time-resolved PL spectroscopies. It is confirmed that the PL intensity of the NC films decreases rapidly with increasing temperature below 300 K and is nearly invariant till 370 K due to thermal quenching and degradation, respectively. With increasing temperature, photo energies of linewidth and emission peak become larger due to stronger exciton-phonon coupling. It is found that temperature-dependent PL is composed of a band-edge excitonic state and trapping state emission and produces the observation of biexponential kinetics. The short-lived emission is due to band-edge exciton recombination, while the component with long-lived lifetime is ascribed to trapping state, which arises from recombination in NC that has a photoinduced trapped pathway and a temporally resolved peak shift. Besides organic-inorganic perovskite hybrid NCs, trapping state also exists in all-inorganic CsPbX3 NCs, even though PL spectrum has high PL quantum yield and narrow emission linewidths.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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