Hot Carrier Trapping in Light‐Soaked Mixed Phase CsPbI₃ Perovskite Nanocrystals

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 13, 2025

Abstract Red‐emitting CsPbI 3 perovskite nanocrystals (r‐PNCs) are considered promising for device applications due to their low bandgap. However, practical use is hindered by significant photoluminescence (PL) intermittency and light‐induced phase transitions. Specifically, the stable bright α‐phase of r‐PNCs quickly converts into weakly emissive mixed‐phase (δ γ) within hours under UV irradiation. In absence light, synthesized using an advanced method have been shown maintain brightness over 20 days. This study explores PL better understand carrier dynamics nature trap states in both mixed phases. These results indicate that r‐PNCs, despite apparent stability, undergo rapid deformation during a blinking experiment, as evidenced decrease average ON state intensity trajectories change XRD patterns. Fluorescence‐lifetime‐intensity‐distribution (FLID) mapping from studies, combined with fluorescence lifetime correlation spectroscopy (FLCS), reveals freshly prepared exhibit behavior primarily governed short‐lived near band edge. dynamic function multiple non‐radiative recombination centers (MRCs). contrast, light‐soaked develop long‐lived deep states, leading dispersive predominantly caused hot (HC) recombination.

Language: Английский

Structure Prediction for Nanoscale Magic-Size CdSe Clusters from a New Efficient Structure-Searching Strategy

Nanoscale, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

An efficient geometry searching workflow was developed for (CdSe) n magic-size clusters. A novel adamantane-type core@cage structure identified 34 the first time.

Language: Английский