Emission enhancement and bandgap narrowing in $Cs_2TeBr_6$ under pressure

TL;DR

This study investigates how applying pressure to Cs2TeBr6 enhances its emission and narrows its bandgap, revealing insights into electron-phonon interactions and structural behavior under pressure.

Contribution

It provides the first detailed analysis of pressure effects on emission, bandgap, and structural properties of Cs2TeBr6 perovskite, highlighting mechanisms behind emission enhancement.

Findings

Pressure increases emission intensity and narrows the bandgap.

Self-trapped excitons dominate broad emission under pressure.

Electron-phonon interactions are key to observed behaviors.

Abstract

Pressure-induced emission enhancement and bandgap narrowing in vacancy-ordered halide double perovskite $Cs_2TeBr_6$ are extensively investigated through photoluminescence and absorption experiments. The below bandgap broad emission is attributed to self-trapped excitons recombination. The $Cs_2TeBr_6$ crystal, consisting of undistorted octahedra, exhibits substantial emission enhancement due to the lowering of the energy barrier between $^3P_1$ and self-trapped exciton states, as well as the suppression of nonradiative energy loss with increasing pressure. In the Raman measurements, the observed behavior of full width at half maximum of all Raman modes implies dominant electron-phonon interactions rather than anharmonic interactions between phonons. The pressure-dependent X-ray diffraction measurements reveal an anomalous behaviour in the normalized pressure as a function of the Eulerian strain.