Fluorescence of Single Conjugated Chains of MEH-PPV Dispersed in Polymer Matrix: What Do We See in the Microscope?  

作　　者：Mingyi Xie Marina V.Kuzimenkova Per-Olof Larsson Yuxi Tian Ivan G.Scheblykin 

机构地区：[1]Key Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,Jiangsu,210023 China [2]Chemical Physics and NanoLund,Lund University,PO Box 124,SE-22100 Lund,Sweden [3]Pure and Applied Biochemistry,Lund University,PO Box 124,SE-22100 Lund,Sweden

出　　处：《Chinese Journal of Chemistry》2023年第19期2536-2544,共9页中国化学（英文版）

基　　金：supported by the National Natural Science Foun-dation of China(NSFC Nos.22073046 and 62011530133);the Fundamental Research Funds for the Central Universities(020514380256 and 020514380278);the State Key Laboratory of Analytical Chemistry for Life Science(SKLACL2217);The authors are also grateful to the STINT China-Sweden mobility program CH2019-8329 and the Swedish Research Council(2020-03530).

摘　　要：It has been a mystery that the detected fluorescence intensity of single MEH-PPV molecules is much lower than expected based on their chain length.In this review,after re-evaluating of the literature data in the light of new specially designed experiments,we present a comprehensive explanation of this issue:The actual size of MEH-PPV molecules at single molecule level is much smaller than expected due to de-aggregation and chain scission,while static quenching("dark matter")also exists for large molecules,further reducing their brightness.

关 键 词：MEH-PPV Single molecule spectroscopy BRIGHTNESS FLUORESCENCE Molecular weight anrohonci 

分 类 号：O657.34[理学—分析化学]