(387b) Reversible On/Off Modulation of Photoluminescence from TiO2/CsPbBr3 Using Redox Clusters | AIChE

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(387b) Reversible On/Off Modulation of Photoluminescence from TiO2/CsPbBr3 Using Redox Clusters

Authors 

Pramata, A. D. - Presenter, Kumamoto University
Kida, T., Kumamoto University
Akaishi, Y., Kumamoto University
Quitain, A., Kumamoto University
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AzzahPramata Normal azzah pramata 2 2 2019-04-12T13:25:00Z 2019-04-12T13:25:00Z 1 240 1374 11 3 1611 16.00

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normal">Reversible
On/Off Modulation of Photoluminescence from TiO2/CsPbBr3
Using Redox Clusters

normal">Azzah
Dyah Pramata, Yuji Akaishi, Armando T. Quitain, Tetsuya Kida

107%;font-family:" times new roman>Abstract:



自動的に生成された説明" v:shapes="_x56f3__x0020_3" class="documentimage"> 107%;font-family:" times new roman>Lead halide perovskite quantum dots
(QDs) gained considerable attention owing to the excellent luminescent
properties. Here, we focus on modulation of the the
photoluminescence (PL) emission of perovskite QDs by coupling them with a redox
cluster of polyoxometalates (POMs). The stability of QDs was improved by TiO2
coating. The as-prepared TiO2/CsPbBr3 QDs emits green
emission at green emission peaking at 522 nm with the full width at half
maximum (FWHM) of 18 nm and the quantum yield (QY) was 54.1%. The bandgap of
TiO2/CsPbBr3 QDs was 2.24 eV with the size 21.3 nm in
orthorhombic phase. We studied photoinduced electron transfer (PET) from the
TiO2/CsPbBr3 QDs to (Bu4N)4[W10O32]
(tetrakis(tetrabutylammonium)decatungstate) under
visible light irradiation. UV-vis absorbance, PL, and PL lifetime measurements
indicate that PET efficiently took place from the QDs to the POM. The exposure
of visible light excites and injects photogenerated electrons into POMs to
produce one-electron reduced POMs (POM–), prompted the PL quenching.
The POM– was easily oxidized by atmospheric oxygen, leading to the
PL recovery. The modulation process was repeated up to 12 cycles with PL
recovery above 80%. The results demonstrate the promising feature of the
QDs/POM system for applications optical memories, biosensing and photocatalytic
devices.

107%;font-family:" times new roman>Keywords:
lead halide perovskite, quantum dots, On/Off switching, photoluminescence,
polyoxometalate

Topics 

Nanomaterials

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