Lattice constriction and trapped excitons: a structure–property relationship unveiled in CsPbBr₃ perovskite QDs

Abstract

Perovskite nanocrystals (NCs) of CsPbBr3 have gained special attention in optoelectronic applications owing to their photoluminescence (PL) properties.

Dissipation of Charge Accumulation and Suppression of Phase Segregation in Mixed Halide Perovskite Solar Cells via Nanoribbons

“…However, it was interesting to note that the (200) peak for the modified film had broadened sufficiently with a significant increase in its intensity on illumination, suggesting higher grain crystallinity and better monodispersity. Also, lattice strain and thus constriction (red shift) can facilitate a stronger electron–phonon interaction, trapping polarons, which enhances the luminescence properties . To exclude the possibility that peak splitting comes from perovskite decomposition, we kept the illuminated thick films in the dark for 2 h and found that peak splitting can be reversed, which is again consistent with the previous report …”

Aqueous, Non-Polymer-Based Perovskite Quantum Dots for Bioimaging: Conserving Fluorescence and Long-Term Stability via Simple and Robust Synthesis

“…The detailed comparison as shown in Figure S10 indicates a small peak at 23.3°, which could be assigned to PbBr 2 for the plane (200), and we believe that the surface etching caused during ligand exchange (wherein reconstruction of surface atoms occurs) may have resulted in this PbBr 2 , which is slightly soluble in water. The crystallite size calculated as per Scherrer’s equation shows a slight reduction in crystallite size from 8.7 to 8.3 nm after phase transfer. This is in agreement with the UV–vis studies, which showed a blue shift due to reduction in the particle size.…”

Enhanced emission efficiency in doped CsPbBr3 perovskite nanocrystals: the role of ion valence

“…35,36 The La 3+ doped CsPbBr 3 NCs increased the PLQY by trapping stable excitons to enhance radiative recombinations, paving a pathway to detect La by tracking the changes in PL. 37 Therefore, only a few specific ions can improve the luminescence performance of CsPbX 3 NCs. The literature [37][38][39] indicates that the PLQY of green-emitting CsPbBr 3 NCs is enhanced upon the doping of Sr 2+ and La 3+ .…”

“…37 Therefore, only a few specific ions can improve the luminescence performance of CsPbX 3 NCs. The literature [37][38][39] indicates that the PLQY of green-emitting CsPbBr 3 NCs is enhanced upon the doping of Sr 2+ and La 3+ . Moreover, in most studies, the effects of divalent or trivalent ion doping into perovskite NCs have only been studied in a single way.…”