Switchable near-infrared photoluminescence of PbS quantum dots through light and heat modulated hole transfer to spiropyran molecules  

作　　者：Zongwei Chen Zhengxiao Li Fan Li Jingzhu Huo Xinyi Meng Shihao Ma Wenbo Zhu Fengqi Guo Jia-Hua Hu Kaifeng Wu 

机构地区：[1]Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450052,China [2]College of Chemistry,Zhengzhou University,Zhengzhou 450052,China [3]State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials(iChEM),Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2024年第12期10483-10489,共7页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(Nos.21803070,22103072,and 22173098);the Fundamental Research Funds for the Central Universities(No.20720220009).

摘　　要：Precise modulation of photoluminescence(PL)of nanomaterials by external control is of great interest in such diverse areas as photocatalysis,memory and sensing.Recent studies have combined colloidal quantum dots(QDs)with photochromic molecules to construct optically switchable PL systems.However,it still remains challenging to switch the PL on and off in the near-infrared(NIR)region with multi-stimuli such as light and heat.Here,we present light and heat triggered modulation of the NIR PL of PbS QDs using adjacent spiropyran derivatives.The NIR PL of PbS was reversibly switched on and off through the isomerization process of spiropyran molecules that can be triggered by either light irradiation or heating.The PL intensity of the off state is low enough to yield an on/off ratio as high as 54.Transient absorption measurements revealed ultrafast photoinduced hole transfer from PbS to spiropyran,the rate and efficiency of which depend critically on the driving force that can be deeply modulated through spiropyran isomerization.This study not only establishes a novel multi-stimuli switchable PL system in the NIR,but also provides fundamental guidelines for the design for such systems for a variety of emerging applications.

关 键 词：PHOTOSWITCH near-infrared(NIR)photoluminescence quantum dots SPIROPYRAN hole transfer 

分 类 号：TN21[电子电信—物理电子学]