4D LABS at Simon Fraser University, 8888 University Drive, Burnaby, BC, CanadaV5A 1S6.
Photochem Photobiol Sci. 2010 Feb;9(2):249-53. doi: 10.1039/b9pp00115h. Epub 2010 Jan 18.
Photoisomerization of a coordinating, photochromic dithienylethene bearing a pyridine and a methylpyridinium group was investigated as a means to reversibly modulate the luminescence from CdSe-ZnS core-shell quantum dots. Resonance energy transfer and electron transfer are both plausible quenching mechanisms based on an increase in the spectral donor-acceptor overlap and an anodic shift in the reduction potential accompanying the isomerization reaction of the dithienylethene photoswitch. Photochemical degradation of both the quantum dot and photochromic quencher was observed after repeated cycling between the two isomers, suggesting irreversible electron transfer from the quantum dot to the dithienylethene as the dominant luminescence quenching mechanism.
研究了一种带有吡啶和甲基吡啶基团的配位光致变色二噻吩乙烯的光异构化，作为一种可逆调节 CdSe-ZnS 核壳量子点发光的方法。基于供体-受体光谱重叠的增加和异构化反应伴随的还原电位的阳极位移，共振能量转移和电子转移都是可能的猝灭机制。在两种异构体之间反复循环后，观察到量子点和光致变色猝灭剂的光化学降解，这表明电子从量子点不可逆地转移到二噻吩乙烯是主要的发光猝灭机制。
