Structural transition and emission enhancement in vacancy ordered halide double perovskite Cs${}_2$TeCl${}_6$ under pressure

Abstract

The effect of pressure on the structural evolution, enhancement of photoluminescence intensity and optical band gap of a vacancy ordered double halide perovskite Cs${}_2$TeCl${}_6$ is investigated systematically. We use synchrotron x-ray diffraction, Raman spectroscopy, optical band gap and photoluminescence measurements to explore the structural and the optical properties of Cs${}_2$TeCl${}_6$ under pressure up to 30.0 GPa. We find that Cs${}_2$TeCl${}_6$ undergoes a structural transition from cubic Fm$\bar{3}$m to monoclinic P2${}_1$/n at very low pressure below 1.0 GPa. A significant increase in photoluminescence intensity and a rapid decrease in optical band gap are observed, which are related to the octahedral distortion and structural transition. Interestingly, with increasing pressure, the sample regains its ambient Fm$\bar{3}$m structure at around 3.4 GPa maintaining the cubic phase up to 30.0 GPa. The sample undergoes an iso-structural transition at around 14.1 GPa pressure with a slight decrease in compressibility.