Emission enhancement and bandgap narrowing in $Cs_2TeBr_6$ under pressure
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arXiv
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| Format: | Preprint |
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2024
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| author | Samanta, Debabrata Mukherjee, Suvashree Mishra, Asish Kumar Giri, Bhagyashri Chaudhary, Sonu Pratap Glazyrin, Konstantin Bhattacharyya, Sayan Mukherjee, Goutam Dev |
| author_facet | Samanta, Debabrata Mukherjee, Suvashree Mishra, Asish Kumar Giri, Bhagyashri Chaudhary, Sonu Pratap Glazyrin, Konstantin Bhattacharyya, Sayan Mukherjee, Goutam Dev |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_11308 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Emission enhancement and bandgap narrowing in $Cs_2TeBr_6$ under pressure Samanta, Debabrata Mukherjee, Suvashree Mishra, Asish Kumar Giri, Bhagyashri Chaudhary, Sonu Pratap Glazyrin, Konstantin Bhattacharyya, Sayan Mukherjee, Goutam Dev Materials Science 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. |
| title | Emission enhancement and bandgap narrowing in $Cs_2TeBr_6$ under pressure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.11308 |