TY - JOUR
T1 - TiO2/CsPbBr3Quantum Dots Coupled with Polyoxometalate Redox Clusters for Photoswitches
AU - Pramata, Azzah Dyah
AU - Akaishi, Yuji
AU - Sadowara, Koki
AU - Mokuge, Yui
AU - Kodama, Naohiro
AU - Shimoyoshi, Manami
AU - Kida, Tetsuya
N1 - Publisher Copyright:
©
PY - 2020/11/25
Y1 - 2020/11/25
N2 - 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.
AB - 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.
KW - lead-halide perovskite
KW - nanocrystals
KW - on/off switching
KW - photoluminescence
KW - polyoxometalate
KW - quantum dots
UR - http://www.scopus.com/inward/record.url?scp=85096022050&partnerID=8YFLogxK
U2 - 10.1021/acsanm.0c02323
DO - 10.1021/acsanm.0c02323
M3 - Article
AN - SCOPUS:85096022050
SN - 2574-0970
VL - 3
SP - 11184
EP - 11193
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
IS - 11
ER -