期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 965, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.171442
关键词
Perovskite nanocrystals; Heterostructure; NIR fluorescence; Excellent stability
Heterostructured CsPbBr3/Cs4PbBr6@PbS nanocrystals with high thermal and humidity stability were successfully synthesized, showing strong fluorescence in visible and near infrared region under excitation at 365 nm.
Despite excellent optoelectronic properties, the practical applications of halide perovskite nanocrystals (NCs) have been restricted by their intrinsic instability. In this study, heterostructured CsPbBr3/Cs4PbBr6@PbS NCs were successfully synthesized using a simple solvothermal method. CsPbBr3/Cs4PbBr6@PbS NCs exhibited strong fluorescence in visible and near infrared (NIR) region under excitation at 365 nm. Remarkably, the CsPbBr3/Cs4PbBr6@PbS NCs showed improved excellent thermal and humidity stabilities compared with CsPbBr3 NCs. The incorporation of PbS shell could passivate the surface of CsPbBr3/Cs4PbBr6 NCs, leading them to exhibit fluorescence at higher temperatures compared with CsPbBr3 NCs, their fluorescence was quenched completely until the temperature was close to 200 degrees C while the fluorescence of CsPbBr3 NCs disappeared at similar to 100.C. In addition, the incorporation of PbS shell also limit the etch effect of CsPbBr3/Cs4PbBr6 NCs by water molecules, rendering them to retain the fluorescence after several months of exposure to air. These findings demonstrate a simple yet effective approach to improving the stability of perovskite NCs, providing new possibilities for their utilization in various optoelectronic devices.
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