Free and self-trapped exciton emission in perovskite CsPbBr₃ microcrystals

Abstract

A broad STE emission band together with a FE emission was found at low temperature in a CsPbBr3 microcrystal sample prepared by CVD method.

Ultra-fast low temperature scintillation and X-ray luminescence of CsPbCl3 crystals

“…It should be noted that this behavior is different from what is typically reported for nanocrystals where the short decay component increases with rising temperature while the slow one decreases. 39,41,52,53 In line with previous studies, we attribute the fast (t 1 ) and middle (t 2 ) components in the emission of CsPbCl 3 to the radiative decay of bound excitons. The delayed component t 2 Fig.…”

“…19,35 Similarly, the structured luminescence has been observed in CsPbBr 3 and there is extensive discussion regarding its origin. Although the exact nature of the band remains unclear, the most plausible explanations are self-trapped exciton, 41 re-absorption effect, 42 bulk vs surface recombination 43 and Rashba-splitting. 44…”

“…It should be noted that this behavior is different from what is typically reported for nanocrystals where the short decay component increases with rising temperature while the slow one decreases. 39,41,52,53…”

“…19,35 Similarly, the structured luminescence has been observed in CsPbBr 3 and there is extensive discussion regarding its origin. Although the exact nature of the band remains unclear, the most plausible explanations are self-trapped exciton, 41 re-absorption effect, 42 bulk vs surface recombination 43 and Rashba-splitting. 44 Another interesting feature of the X-ray luminescence of CsPbCl 3 crystals is the abnormal shift of the main emission bands with temperature as shown in the insert of Fig.…”

Self‐Trapped Excitons in 2D SnP2S6 Crystal with Intrinsic Structural Distortion

“…The obvious inflection of FWHM at 160 K is probably due to different electron‐phonon interaction broadening contribution at different temperature regimes. [ 34,35 ] The as‐extracted S value is 18.3, which is even outperforming than many common perovskites with strong electron‐phonon coupling and STE emssion, such as CsPbBr 3 (≈12), [ 36 ] CsAgCl 2 (≈12.1) [ 37 ] and (MA) 4 Cu 2 Br 6 (≈10.7). [ 34 ] Moreover, there is a slight blueshift in the PL peak energy as the temperature increases (Figure 2f), which may be caused by the transfer of STEs to higher energy levels due to thermal jump.…”