期刊
ADVANCED MATERIALS INTERFACES
卷 10, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/admi.202201886
关键词
CsPbBr; (3) quantum dots; porphyrin-thiol; stability; stimuli responsiveness; surface management
Surface ligand management is crucial in enhancing the stability and responsiveness of perovskite quantum dots (QDs). In this study, a red fluorescence porphyrin-thiol (Por-SH) is used to adjust the surface and stimuli responsiveness of CsPbBr3 QDs, resulting in the formation of Por-SH-QDs with excellent resistance to water and UV light. Through energy transfer from CsPbBr3 to Por-SH, the photoresponse of Por-SH is improved, especially when heated. The Por-SH-QDs exhibit reversible stimuli-response property in the presence of heat/cool stimuli when excited by UV light, making them suitable for optical encoding labels.
Surface ligand management plays an essential role in improving the stability of perovskite quantum dots (QDs) and endowing them with novel property. Herein, a red fluorescence porphyrin-thiol (named Por-SH) is applied to adjust the surface and stimuli responsiveness of CsPbBr3 QDs. According to the theoretical and experimental results, Por-SH can bind tightly to the exposed Pb of CsPbBr3 QDs, thus leading to the formation of Por-SH-QDs with an excellent resistance to water and UV light. Moreover, CsPbBr3 act as energy donors to improve the photoresponse of Por-SH through energy transfer, especially when heated. Notably, the Por-SH and QDs behave differently in terms of response to the temperature in the Por-SH-QDs system. Therefore, the Por-SH-QDs are capable of reversible stimuli-response property in the presence of heat/cool stimuli when excited by UV light. Finally, the disposable or reversible optical encoding label based on Por-SH-QDs and QDs is obtained by combining stability and the responsiveness to stimuli. Through the selection of suitable ligands, the surface of QDs is efficiently managed, which can not only mitigate instability but also endow perovskite QDs with the responsiveness to stimuli.
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