In this paper, we address the phase stability and the relationship between optical gap and structural perturbations in cesium lead halide nanocrystals. We report photoluminescence (PL) spectra for cesium lead iodide (CsPbI3) perovskite nanocrystals under hydrostatic pressures up to 2.5 GPa. The peak position of the CsPbI3\ PL shifts as a function of pressure. Initially, the PL shifts to lower energies, until a reversal occurs near 0.33 GPa. At higher pressures, the PL peak position shifts to the blue until PL vanishes above 2.5 GPa. We explain the pressure response with different modes of deformation of the perovskite crystal structure.
BT - The Journal of Physical Chemistry C DA - 2018-04 DO - 10.1021/acs.jpcc.8b03280 N2 -In this paper, we address the phase stability and the relationship between optical gap and structural perturbations in cesium lead halide nanocrystals. We report photoluminescence (PL) spectra for cesium lead iodide (CsPbI3) perovskite nanocrystals under hydrostatic pressures up to 2.5 GPa. The peak position of the CsPbI3\ PL shifts as a function of pressure. Initially, the PL shifts to lower energies, until a reversal occurs near 0.33 GPa. At higher pressures, the PL peak position shifts to the blue until PL vanishes above 2.5 GPa. We explain the pressure response with different modes of deformation of the perovskite crystal structure.
PY - 2018 SP - 11024 EP - 11030 T2 - The Journal of Physical Chemistry C TI - Pressure Response of Photoluminescence in Cesium Lead Iodide Perovskite Nanocrystals UR - https://pubs.acs.org/doi/pdfplus/10.1021/acs.jpcc.8b03280 VL - 122 SN - 1932-7447 ER -