503 / 2019-03-19 08:55:43

Pressure-Induced Emission of One-Dimensional Organic Tin Bromide Perovskites

High pressure,Halide perovskite,Phase transition,Pressure-induced emission

全体主题 > High Pressure Physics and Materials Science

Low-dimensional halide perovskites easily suffer from the structural distortion associated with significant quantum confinement effects. Organic tin bromide perovskite C4N2H14SnBr4 is an unique one-dimensional (1D) structure in which the edge sharing octahedral tin bromide chains [SnBr4] ∞ are surrounded by the organic cations C4N2H14 to form the bulk assembly of core-shell quantum wires. Some unusual phenomena under high pressure are accordingly expected. Here, an intriguing pressure-induced emission (PIE) in C4N2H14SnBr4 was successfully achieved by means of diamond anvil cell. The observed PIE is greatly associated with the large distortion
of [SnBr 6 ] 4− octahedral motifs resulting from a structural phase transition, which can be
corroborated by in situ high-pressure photoluminescence, absorption, and angle-dispersive X-ray diffraction spectra. The distorted [SnBr6 ]4− octahedra would accordingly facilitate the radiative recombination of self-trapped excitons (STEs) by lifting the activation energy of detrapping of self-trapped states. First-principles calculations indicate that the enhanced
transition dipole moment and the increased binding energy of STEs are highly responsible for the remarkable PIE. This work will improve the potential applications in the fields of pressure sensors, trademark security and information storage.