{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Kluherz KT"],"funding":["Basic Energy Sciences","National Renewable Energy Laboratory","Brookhaven National Laboratory"],"pagination":["30436-30446"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12371897"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["147(33)"],"pubmed_abstract":["The expression of metal lone-pair electrons is hypothesized to underpin many of the interesting properties of inorganic halide perovskite semiconductors. Recently, a stable low-temperature monoclinic polar phase was predicted for CsSnBr<sub>3</sub> and CsSnI<sub>3</sub>, opening the possibility of direct investigation of a ferroelectric distorted structure compared to the undistorted structure. To date, there have been no experimental reports of such a structure in CsSnI<sub>3</sub>, and the low-temperature optical properties of CsSnI<sub>3</sub> nanocrystals have remained unexplored. Here we report optical and structural evidence of a phase transition around 240 K in 8.9 nm CsSnI<sub>3</sub> nanocrystals. Several changes in optical behavior occur below this transition point, including high-energy photoluminescence (PL) that emits concurrently with the exciton PL. The emergence of this high-energy PL is correlated with X-ray diffraction (XRD) and differential scanning calorimetry (DSC) supporting a phase transition from the orthorhombic structure between 240-200 K. Transient absorption measurements show an increase in the excited state lifetimes, i.e., slowed carrier cooling, at 200 K when photoexciting with photon energies above the high-energy state, consistent with slowed carrier cooling and emergence of high-energy PL. We hypothesize that the slowed carrier cooling is distinctive to this phase transition that modifies both the electronic and phonon structures that dictate excited-state carrier dynamics, and we discuss these changes."],"journal":["Journal of the American Chemical Society"],"pubmed_title":["Dual Photoluminescence in Low-Temperature Phase of CsSnI&lt;sub&gt;3&lt;/sub&gt; Nanocrystals."],"pmcid":["PMC12371897"],"funding_grant_id":["DE-SC0012704","DE-AC36-08GO28308"],"pubmed_authors":["Weadock NJ","Sercel PC","Beard MC","Kluherz KT","Shelton JL","Leick N"],"additional_accession":[]},"is_claimable":false,"name":"Dual Photoluminescence in Low-Temperature Phase of CsSnI&lt;sub&gt;3&lt;/sub&gt; Nanocrystals.","description":"The expression of metal lone-pair electrons is hypothesized to underpin many of the interesting properties of inorganic halide perovskite semiconductors. Recently, a stable low-temperature monoclinic polar phase was predicted for CsSnBr<sub>3</sub> and CsSnI<sub>3</sub>, opening the possibility of direct investigation of a ferroelectric distorted structure compared to the undistorted structure. To date, there have been no experimental reports of such a structure in CsSnI<sub>3</sub>, and the low-temperature optical properties of CsSnI<sub>3</sub> nanocrystals have remained unexplored. Here we report optical and structural evidence of a phase transition around 240 K in 8.9 nm CsSnI<sub>3</sub> nanocrystals. Several changes in optical behavior occur below this transition point, including high-energy photoluminescence (PL) that emits concurrently with the exciton PL. The emergence of this high-energy PL is correlated with X-ray diffraction (XRD) and differential scanning calorimetry (DSC) supporting a phase transition from the orthorhombic structure between 240-200 K. Transient absorption measurements show an increase in the excited state lifetimes, i.e., slowed carrier cooling, at 200 K when photoexciting with photon energies above the high-energy state, consistent with slowed carrier cooling and emergence of high-energy PL. We hypothesize that the slowed carrier cooling is distinctive to this phase transition that modifies both the electronic and phonon structures that dictate excited-state carrier dynamics, and we discuss these changes.","dates":{"release":"2025-01-01T00:00:00Z","publication":"2025 Aug","modification":"2026-05-09T10:41:06.765Z","creation":"2026-04-08T00:48:33.954Z"},"accession":"S-EPMC12371897","cross_references":{"pubmed":["40767961"],"doi":["10.1021/jacs.5c10595"]}}