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TiO2/CsPbBr3 Quantum Dots Coupled with Polyoxometalate Redox Clusters for Photoswitches
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-29 , DOI: 10.1021/acsanm.0c02323 Azzah Dyah Pramata 1 , Yuji Akaishi 2 , Koki Sadowara 2 , Yui Mokuge 2 , Naohiro Kodama 2 , Manami Shimoyoshi 2 , Tetsuya Kida 3
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-29 , DOI: 10.1021/acsanm.0c02323 Azzah Dyah Pramata 1 , Yuji Akaishi 2 , Koki Sadowara 2 , Yui Mokuge 2 , Naohiro Kodama 2 , Manami Shimoyoshi 2 , Tetsuya Kida 3
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Lead-halide perovskite quantum dots (QDs) have been intensively studied, owing to their excellent optical properties. Herein, the photoluminescence (PL) emission of perovskite QDs was controlled by coupling them with a polyoxometalate (POM) redox cluster to develop photoswitches that undergo changes in optical properties in response to light stimulus. CsPbBr3 QDs were coated with a TiO2 layer, and photoinduced electron transfer (PET) from the TiO2/CsPbBr3 QDs to (Bu4N)4[W10O32] (tetrakis(tetrabutylammonium)decatungstate) under visible-light irradiation was examined. UV–vis absorbance, PL emission, and PL lifetime measurements indicated that efficient PET from the QDs to the POM took place under visible-light irradiation, thereby quenching the PL emission. PET also led to the generation of one-electron reduced POM (POM–). The PL quenching proceeded via PET from QDs to POM, POM– formation, and PET to POM–. POM– was easily oxidized on exposure to atmospheric oxygen, leading to the restoration of the PL. The PL emission could be repeatedly quenched and restored by visible-light irradiation and oxygen introduction, respectively. The results demonstrate the promising utility of the QD/POM system as photoswitches that can be used for super-resolution imaging, photomemory, fluorescent patterning, and bioimaging.
中文翻译：
TiO 2 / CsPbBr 3量子点与多金属氧酸盐氧化还原簇耦合用于光开关
卤化钙钛矿型量子点（QDs）由于其优异的光学性能而被广泛研究。在本文中，通过将钙钛矿QD与多金属氧酸盐（POM）氧化还原簇耦合来控制钙钛矿QD的光致发光（PL）发射，以开发出响应于光刺激而发生光学性质变化的光开关。将CsPbBr 3 QDs涂覆TiO 2层，然后将光致电子从TiO 2 / CsPbBrBr 3 QDs转移到（Bu 4 N）4 [W 10 O 32在可见光照射下检查了[四（四丁基铵）去甲酸盐]。紫外可见吸收，PL发射和PL寿命测量表明，从QD到POM的有效PET是在可见光照射下发生的，从而淬灭了PL发射。PET还导致了单电子还原POM（POM –）的产生。PL淬火通过PET从QD到POM，形成POM –以及从PET到POM –进行。POM –暴露于大气氧气中易被氧化，导致PL的恢复。可以分别通过可见光照射和氧气引入来反复抑制和恢复PL发射。结果证明了QD / POM系统作为光开关的有前途的实用性，可用于超分辨率成像，光记忆，荧光图案和生物成像。
更新日期：2020-11-25
中文翻译：
TiO 2 / CsPbBr 3量子点与多金属氧酸盐氧化还原簇耦合用于光开关
卤化钙钛矿型量子点（QDs）由于其优异的光学性能而被广泛研究。在本文中，通过将钙钛矿QD与多金属氧酸盐（POM）氧化还原簇耦合来控制钙钛矿QD的光致发光（PL）发射，以开发出响应于光刺激而发生光学性质变化的光开关。将CsPbBr 3 QDs涂覆TiO 2层，然后将光致电子从TiO 2 / CsPbBrBr 3 QDs转移到（Bu 4 N）4 [W 10 O 32在可见光照射下检查了[四（四丁基铵）去甲酸盐]。紫外可见吸收，PL发射和PL寿命测量表明，从QD到POM的有效PET是在可见光照射下发生的，从而淬灭了PL发射。PET还导致了单电子还原POM（POM –）的产生。PL淬火通过PET从QD到POM，形成POM –以及从PET到POM –进行。POM –暴露于大气氧气中易被氧化，导致PL的恢复。可以分别通过可见光照射和氧气引入来反复抑制和恢复PL发射。结果证明了QD / POM系统作为光开关的有前途的实用性，可用于超分辨率成像，光记忆，荧光图案和生物成像。
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