Pressure-Induced Emission (PIE) of One-Dimensional Organic Tin Bromide Perovskites
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-04-10 |
| Journal | Journal of the American Chemical Society |
| Authors | Yue Shi, Zhiwei Ma, Dianlong Zhao, Yaping Chen, Ye Cao |
| Institutions | Jilin University, State Key Laboratory of Superhard Materials |
| Citations | 195 |
Abstract
Section titled āAbstractāLow-dimensional halide perovskites easily suffer from the structural distortion related to significant quantum confinement effects. Organic tin bromide perovskite C<sub>4</sub>N<sub>2</sub>H<sub>14</sub>SnBr<sub>4</sub> is a unique one-dimensional (1D) structure in which the edge sharing octahedral tin bromide chains [SnBr<sub>4</sub><sup>2-</sup>]<sub>ā</sub> are embraced by the organic cations C<sub>4</sub>N<sub>2</sub>H<sub>14</sub><sup>2+</sup> 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 C<sub>4</sub>N<sub>2</sub>H<sub>14</sub>SnBr<sub>4</sub> was successfully achieved by means of a diamond anvil cell. The observed PIE is greatly associated with the large distortion of [SnBr<sub>6</sub>]<sup>4-</sup> 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 [SnBr<sub>6</sub>]<sup>4-</sup> 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.