Pressure-Induced Structural and Optical Transitions in Luminescent Bulk Cs4PbBr6
Low-dimensional metal halide compounds, usually described as low-dimensional perovskites, present exciting properties as functional materials for a broad range of optoelectronic applications. These compounds are characterized by intense photoluminescence (PL), a narrow emission line width, and a hig...
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| Veröffentlicht in: | Journal of physical chemistry. C 2022-01, Vol.126 (1), p.541-550 |
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| creator | Castro Ferreira, W Araújo, B. S Gómez, M. A. P Medeiros, F. E. O de Araujo Paschoal, C. W da Silva, C. B Freire, P. T. C Kaneko, U. F Ardito, F. M Souza-Neto, N. M Ayala, A. P |
| description | Low-dimensional metal halide compounds, usually described as low-dimensional perovskites, present exciting properties as functional materials for a broad range of optoelectronic applications. These compounds are characterized by intense photoluminescence (PL), a narrow emission line width, and a high exciton binding energy. In particular, the mechanism behind the strong green emission of the zero-dimensional compound Cs4PbBr6 has been the subject of intense debate. As a property-tuning tool, hydrostatic pressure was used to investigate the structural and optical properties of bulk Cs4PbBr6 through synchrotron X-ray diffraction combined with Raman and PL spectroscopies. As a result, two structural phase transitions at 3.2 and 4.6 GPa were identified, with the latter not observed in previous investigations performed on nanocrystals. Also, the pressure dependence of the PL emission was recorded and compared with the previous results on Cs4PbBr6 and CsPbBr3 nanocrystals. Under the ambient conditions, strong green emission exhibits a subtle redshift, followed by a blueshift under pressure, being associated first with an intensity enhancement and subsequent quenching above 3 GPa. These results support the CsPbBr3 luminescent inclusions as the PL emission mechanism in Cs4PbBr6. |
| doi_str_mv | 10.1021/acs.jpcc.1c07526 |
| format | Article |
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S ; Gómez, M. A. P ; Medeiros, F. E. O ; de Araujo Paschoal, C. W ; da Silva, C. B ; Freire, P. T. C ; Kaneko, U. F ; Ardito, F. M ; Souza-Neto, N. M ; Ayala, A. P</creator><creatorcontrib>Castro Ferreira, W ; Araújo, B. S ; Gómez, M. A. P ; Medeiros, F. E. O ; de Araujo Paschoal, C. W ; da Silva, C. B ; Freire, P. T. C ; Kaneko, U. F ; Ardito, F. M ; Souza-Neto, N. M ; Ayala, A. P</creatorcontrib><description>Low-dimensional metal halide compounds, usually described as low-dimensional perovskites, present exciting properties as functional materials for a broad range of optoelectronic applications. These compounds are characterized by intense photoluminescence (PL), a narrow emission line width, and a high exciton binding energy. In particular, the mechanism behind the strong green emission of the zero-dimensional compound Cs4PbBr6 has been the subject of intense debate. As a property-tuning tool, hydrostatic pressure was used to investigate the structural and optical properties of bulk Cs4PbBr6 through synchrotron X-ray diffraction combined with Raman and PL spectroscopies. As a result, two structural phase transitions at 3.2 and 4.6 GPa were identified, with the latter not observed in previous investigations performed on nanocrystals. Also, the pressure dependence of the PL emission was recorded and compared with the previous results on Cs4PbBr6 and CsPbBr3 nanocrystals. Under the ambient conditions, strong green emission exhibits a subtle redshift, followed by a blueshift under pressure, being associated first with an intensity enhancement and subsequent quenching above 3 GPa. 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As a property-tuning tool, hydrostatic pressure was used to investigate the structural and optical properties of bulk Cs4PbBr6 through synchrotron X-ray diffraction combined with Raman and PL spectroscopies. As a result, two structural phase transitions at 3.2 and 4.6 GPa were identified, with the latter not observed in previous investigations performed on nanocrystals. Also, the pressure dependence of the PL emission was recorded and compared with the previous results on Cs4PbBr6 and CsPbBr3 nanocrystals. Under the ambient conditions, strong green emission exhibits a subtle redshift, followed by a blueshift under pressure, being associated first with an intensity enhancement and subsequent quenching above 3 GPa. 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C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Castro Ferreira, W</au><au>Araújo, B. S</au><au>Gómez, M. A. P</au><au>Medeiros, F. E. O</au><au>de Araujo Paschoal, C. W</au><au>da Silva, C. B</au><au>Freire, P. T. C</au><au>Kaneko, U. F</au><au>Ardito, F. M</au><au>Souza-Neto, N. M</au><au>Ayala, A. P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pressure-Induced Structural and Optical Transitions in Luminescent Bulk Cs4PbBr6</atitle><jtitle>Journal of physical chemistry. C</jtitle><addtitle>J. Phys. Chem. 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As a result, two structural phase transitions at 3.2 and 4.6 GPa were identified, with the latter not observed in previous investigations performed on nanocrystals. Also, the pressure dependence of the PL emission was recorded and compared with the previous results on Cs4PbBr6 and CsPbBr3 nanocrystals. Under the ambient conditions, strong green emission exhibits a subtle redshift, followed by a blueshift under pressure, being associated first with an intensity enhancement and subsequent quenching above 3 GPa. These results support the CsPbBr3 luminescent inclusions as the PL emission mechanism in Cs4PbBr6.</abstract><pub>American Chemical Society</pub><doi>10.1021/acs.jpcc.1c07526</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-2321-3709</orcidid><orcidid>https://orcid.org/0000-0003-3394-4393</orcidid><orcidid>https://orcid.org/0000-0002-9247-6780</orcidid></addata></record> |
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| subjects | C: Physical Properties of Materials and Interfaces |
| title | Pressure-Induced Structural and Optical Transitions in Luminescent Bulk Cs4PbBr6 |
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