Emission enhancement and bandgap narrowing in Cs2TeBr6 under pressure
Abstract
Pressure-induced emission enhancement and bandgap narrowing in vacancy-ordered halide double perovskite Cs2TeBr6 are extensively investigated through photoluminescence and absorption experiments. The below bandgap broad emission is attributed to self-trapped excitons recombination. The Cs2TeBr6 crystal, consisting of undistorted octahedra, exhibits substantial emission enhancement due to the lowering of the energy barrier between 3P1 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.
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