This paper describes reversible “on–off” switching of the photoluminescence (PL) intensity of CdSe quantum dots (QDs), mediated by photochromic furylfulgide carboxylate (FFC) molecules chemisorbed to the surfaces of the QDs. Repeated cycles of UV and visible illumination switch the FFC between “closed” and “open” isomers. Reversible switching of the QDs’ PL intensity by >80% is enabled by different rates and yields of PL-quenching photoinduced electron transfer (PET) from the QDs to the respective isomers. This difference is consistent with cyclic voltammetry measurements and density functional calculations of the isomers’ frontier orbital energies. This work demonstrates fatigue-resistant modulation of the PL of a QD-molecule complex through remote control of PET. Such control potentially enables applications, such as all-optical memory, sensing, and imaging, that benefit from a fast, tunable, and reversible response to light stimuli.

中文翻译：

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通过激发态电子转移到表面束缚光致变色分子的量子点光致发光的光触发开关。

本文介绍了由化学吸附到QD表面的呋喃夫苷羧酸盐（FFC）分子介导的CdSe量子点（QD）的光致发光（PL）强度的可逆“开-关”切换。UV和可见光照明的重复循环在FFC的“封闭”和“开放”异构体之间切换。QD的PL强度可逆切换> 80％，这是因为从QD到各个异构体的PL猝灭光致电子转移（PET）的速率和产率不同。这种差异与循环伏安法测量和异构体前沿轨道能量的密度泛函计算是一致的。这项工作演示了通过远程控制PET对QD分子复合物的PL的抗疲劳调节。这样的控制有可能启用应用程序，例如全光存储器，