TiO2/CsPbBr3Quantum Dots Coupled with Polyoxometalate Redox Clusters for Photoswitches

Azzah Dyah Pramata, Yuji Akaishi, Koki Sadowara, Yui Mokuge, Naohiro Kodama, Manami Shimoyoshi, Tetsuya Kida*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)11184-11193
Number of pages10
JournalACS Applied Nano Materials
Issue number11
Publication statusPublished - 25 Nov 2020


  • lead-halide perovskite
  • nanocrystals
  • on/off switching
  • photoluminescence
  • polyoxometalate
  • quantum dots


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