Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7840233 | Journal of Luminescence | 2018 | 14 Pages |
Abstract
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 300â¯K and is nearly invariant till 370â¯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.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Qiuju Han, Wenzhi Wu, Weilong Liu, Qingxin Yang, Yanqiang Yang,