{"title":"室温下 CsBr-Cs4PbBr6-CsPbBr3 纳米晶体中出现的多峰发射","authors":"Chandrima Goswami, Asha Bhardwaj","doi":"10.1557/s43578-024-01372-y","DOIUrl":null,"url":null,"abstract":"<p>Highly stable and bright emitting CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr<sub>3</sub>) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\n","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Emergence of multi-peak emission in CsBr-Cs4PbBr6-CsPbBr3 nanocrystals at room temperature\",\"authors\":\"Chandrima Goswami, Asha Bhardwaj\",\"doi\":\"10.1557/s43578-024-01372-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Highly stable and bright emitting CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr<sub>3</sub>) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs<sub>4</sub>PbBr<sub>6</sub>-CsPbBr<sub>3</sub> mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.</p><h3 data-test=\\\"abstract-sub-heading\\\">Graphical abstract</h3>\\n\",\"PeriodicalId\":16306,\"journal\":{\"name\":\"Journal of Materials Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-07-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Materials Research\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1557/s43578-024-01372-y\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Research","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1557/s43578-024-01372-y","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Emergence of multi-peak emission in CsBr-Cs4PbBr6-CsPbBr3 nanocrystals at room temperature
Highly stable and bright emitting CsBr-Cs4PbBr6-CsPbBr3 perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr3) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs4PbBr6-CsPbBr3 mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs4PbBr6-CsPbBr3 mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.
期刊介绍:
Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome.
• Novel materials discovery
• Electronic, photonic and magnetic materials
• Energy Conversion and storage materials
• New thermal and structural materials
• Soft materials
• Biomaterials and related topics
• Nanoscale science and technology
• Advances in materials characterization methods and techniques
• Computational materials science, modeling and theory