{"title":"Effect of Mn<sup>2+</sup>doping and DDAB-assisted postpassivation on the structural and optical properties of CsPb(Cl/Br)<sub>3</sub>halide perovskite nanocrystals.","authors":"Charu Dubey, Anjana Yadav, Santosh Kachhap, Sunil Kumar Singh, Govind Gupta, Satendra Pal Singh, Akhilesh Kumar Singh","doi":"10.1088/2050-6120/ad6ca1","DOIUrl":null,"url":null,"abstract":"<p><p>Cesium lead halide perovskite (CsPbX<sub>3</sub>; X = Cl, Br, I) nanocrystals showing intense band-edge emission and high photoluminescence quantum yield are known to be a potential candidate for application in optoelectronic devices. However, controlling toxicity due to the presence of Pb<sup>2+</sup>in lead-based halide perovskites is a major challenge for the environment that needs to be tackled cautiously. In this work, we have partially replaced Pb<sup>2+</sup>with Mn<sup>2+</sup>ions in the CsPb(Cl/Br)<sub>3</sub>nanocrystals and investigated their impact on the structural and optical properties. The Rietveld refinement shows that CsPbCl<sub>2</sub>Br nanocrystals possess a cubic crystal structure with<i>Pm</i>3̅<i>m</i>space group, the Mn<sup>2+</sup>doping results in the contraction of the unit cell. The CsPb(Cl/Br)<sub>3</sub>: Mn nanocrystals show a substantial change in the optical properties with an additional emission band at ∼588 nm through a d-d transition, changing the emission color from blue to pink. Here, a didodecyldimethylammonium bromide (DDAB) ligand that triggers both anion and ligand exchange in the CsPb(Cl/Br)<sub>3</sub>: Mn nanocrystals have been used to regulate the exchange reaction and tune the emission color of halide perovskites by changing the peak position and the PL intensities of band-edge and Mn<sup>2+</sup>defect states. We have also shown that oleic acid helps in the desorption of oleylamine capping from the CsPb(Cl/Br)<sub>3</sub>: Mn nanocrystal surfaces and DDAB, resulting in the substitution of Cl<sup>-</sup>with Br<sup>-</sup>as well as provides capping with shorter branched length ligand which led to increase in the overall PL intensity by many folds.</p>","PeriodicalId":18596,"journal":{"name":"Methods and Applications in Fluorescence","volume":null,"pages":null},"PeriodicalIF":2.4000,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Methods and Applications in Fluorescence","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1088/2050-6120/ad6ca1","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Cesium lead halide perovskite (CsPbX3; X = Cl, Br, I) nanocrystals showing intense band-edge emission and high photoluminescence quantum yield are known to be a potential candidate for application in optoelectronic devices. However, controlling toxicity due to the presence of Pb2+in lead-based halide perovskites is a major challenge for the environment that needs to be tackled cautiously. In this work, we have partially replaced Pb2+with Mn2+ions in the CsPb(Cl/Br)3nanocrystals and investigated their impact on the structural and optical properties. The Rietveld refinement shows that CsPbCl2Br nanocrystals possess a cubic crystal structure withPm3̅mspace group, the Mn2+doping results in the contraction of the unit cell. The CsPb(Cl/Br)3: Mn nanocrystals show a substantial change in the optical properties with an additional emission band at ∼588 nm through a d-d transition, changing the emission color from blue to pink. Here, a didodecyldimethylammonium bromide (DDAB) ligand that triggers both anion and ligand exchange in the CsPb(Cl/Br)3: Mn nanocrystals have been used to regulate the exchange reaction and tune the emission color of halide perovskites by changing the peak position and the PL intensities of band-edge and Mn2+defect states. We have also shown that oleic acid helps in the desorption of oleylamine capping from the CsPb(Cl/Br)3: Mn nanocrystal surfaces and DDAB, resulting in the substitution of Cl-with Br-as well as provides capping with shorter branched length ligand which led to increase in the overall PL intensity by many folds.
期刊介绍:
Methods and Applications in Fluorescence focuses on new developments in fluorescence spectroscopy, imaging, microscopy, fluorescent probes, labels and (nano)materials. It will feature both methods and advanced (bio)applications and accepts original research articles, reviews and technical notes.