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Structure Evolution and Optical Tuning of One-Dimensional Post-perovskite (TDMP)PbBr under High Pressure.
Inorg Chem
September 2024
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Optimizing the structure and tuning the optical properties in low-dimensional organic-inorganic halide perovskites are crucial to practical applications for stable solid-state lighting. Herein, we performed high-pressure investigations on one-dimensional (1D) postperovskite (TDMP)PbBr (TDMP = -2,5-dimethylpiperaziniium), and structure and optical properties under pressure are studied. (TDMP)PbBr exhibits color tunable emission from cool white light to yellow orange as the pressure increases from atmospheric pressure to 20.
View Article and Find Full Text PDFThermal Activation of Anti-Stokes Photoluminescence in CsPbBr Perovskite Nanocrystals: The Role of Surface Polaron States.
ACS Nano
July 2024
Department of Chemistry, Texas A&M University, College Station, Texas 77840-7896, United States.
Optically driven cooling of a material, or optical refrigeration, is possible when optical up-conversion via anti-Stokes photoluminescence (ASPL) is achieved with near-unity quantum yield. The recent demonstration of optical cooling of CsPbBr perovskite nanocrystals (NCs) has provided a path forward in the development of semiconductor-based optical refrigeration strategies. However, the mechanism of ASPL in CsPbBr NCs is not yet settled, and the prospects for cooling technologies strongly depend on details of the mechanism.
View Article and Find Full Text PDFEvidence of Short-Lived High-Energy Emissive State and Triplet Character of the Self-Trapped Exciton in CsCuI Perovskite.
J Phys Chem Lett
April 2024
Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, U.P., India.
CsCuI perovskite displays a Stokes-shifted photoluminescence (PL) at 445 nm, attributed to the self-trapped excitons (STEs). Unlike that observed in other perovskite materials, the free-exciton emission is not evidenced in this case. Herein, we reveal the existence of a short-lived high-energy emission centered around 375 nm through the reconstruction of time-resolved emission spectra (TRES), which is independent of the shape/size of CsCuI perovskite.
View Article and Find Full Text PDFBoosted Second Harmonic Generation of a Chiral Hybrid Lead Halide Resonant to Charge Transfer Exciton from Metal Halide Octahedra to Ligand.
Angew Chem Int Ed Engl
May 2024
School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Frontiers Science Center for New Organic Matter, Nankai University, Tongyan Road 38, Tianjin, 300350, P. R. China.
Article Synopsis
- * A new mechanism through charge transfer (CT) excited states from metal halide polyhedra to organic ligands is proposed to improve NLO performance significantly.
- * The study demonstrates that the model lead halide (CHN)PbBr achieves impressive second harmonic generation, with NLO coefficients that are much higher than traditional materials, paving the way for designing advanced chiral HOMH materials for photonic uses.
Unusual Pressure-Induced Self-Trapped Exciton to Free Exciton Transfer in Chiral 2D Lead Bromide Perovskites.
ACS Nano
January 2024
School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University & TKL of Metal and Molecule Based Material Chemistry, Tianjin 300350, China.
The phenomenon of pressure-induced emission alterations related to complex excitonic dynamics in 2D lead halide perovskites (LHPs) has gained considerable attention for understanding their structure-property relationship and obtaining inaccessible luminescence under ambient conditions. However, the well-known pressure-induced emissions are limited to the formation of self-trapped excitons (STEs) due to the structural distortion under compression, which goes against the advantage of the highly pure emission of LHPs. Here, the pressure-induced detrapping from STEs to free excitons (FEs) accompanied by the dramatic transition from broadband orangish emission to narrow blue emission has been achieved in chiral 2D LHPs and - and -[4MeOPEA]PbBr, (4MeOPEA = 4-methoxy-α-methylbenzylammonium).
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