Probing the Mechanism of Fluorescence Quenching of QDs by Co(III)-Complexes: Size of QD and Nature of the Complex Both Dictate Energy and Electron Transfer Processes
作者： Anuushka Pal , Sumit Srivastava , Parveen Saini , Shreya Raina , Pravin P. Ingole
关键词: Electron transfer 、 Analytical chemistry 、 Photoluminescence 、 Chemical physics 、 Ground state 、 Chemistry 、 Spectroscopy 、 Förster resonance energy transfer 、 Quenching (fluorescence) 、 Resonant inductive coupling 、 Dexter electron transfer
摘要: The decrease in photoluminescence (PL) of four different sized CdSe colloidal quantum dots (donors) has been investigated the presence three Cobalt(III) complexes (acceptors). steady-state and time-resolved PL (TRPL) spectroscopy have used to investigate mechanism quenching. complex concentration driven change lifetimes QDs stronger quenching than predicted solely by TRPL data indicate that is neither purely static nor dynamic nature. Further, absence any ground state absorption feature suggests contribution due close proximity fluorophores deactivating sites complexes. processes like diffusion mediated collisional quenching, Dexter energy transfer, hole transfer methodically ruled out, leaving Forster resonant (FRET) electron (eT) between as possible mechanisms. Marcu...
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