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Issue 14, 2018, Issue in Progress
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Luminescence and photoelectrochemical properties of size-selected aqueous copper-doped Ag–In–S quantum dots

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Abstract

Ternary luminescent copper and silver indium sulfide quantum dots (QDs) can be an attractive alternative to cadmium and lead chalcogenide QDs. The optical properties of Cu–In–S and Ag–In–S (AIS) QDs vary over a broad range depending on the QD composition and size. The implementation of ternary QDs as emitters in bio-sensing applications can be boosted by the development of mild and reproducible syntheses directly in aqueous solutions as well as the methods of shifting the photoluminescence (PL) bands of such QDs as far as possible into the near IR spectral range. In the present work, the copper-doping of aqueous non-stoichiometric AIS QDs was found to result in a red shift of the PL band maximum from around 630 nm to ∼780 nm and PL quenching. The deposition of a ZnS shell results in PL intensity recovery with the highest quantum yield of 15%, with almost not change in the PL band position, opposite to the undoped AIS QDs. Size-selective precipitation using 2-propanol as a non-solvent allows discrimination of up to 9 fractions of Cu-doped AIS/ZnS QDs with the average sizes in the fractions varying from around 3 to 2 nm and smaller and with reasonably the same composition irrespective of the QD size. The decrease of the average QD size results in a blue PL shift yielding a series of bright luminophors with the emission color varies from deep-red to bluish-green and the PL efficiency increases from 11% for the first fraction to up to 58% for the smallest Cu-doped AIS/ZnS QDs. The rate constant of the radiative recombination of the size-selected Cu-doped AIS/ZnS QDs revealed a steady growth with the QD size decrease as a result of the size-dependent enhancement of the spatial exciton confinement. The copper doping was found to result in an enhancement of the photoelectrochemical activity of CAIS/ZnS QDs introduced as spectral sensitizers of mesoporous titania photoanodes of liquid-junction solar cells.

Graphical abstract: Luminescence and photoelectrochemical properties of size-selected aqueous copper-doped Ag–In–S quantum dots

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Publication details

The article was received on 10 Jan 2018, accepted on 12 Feb 2018 and first published on 16 Feb 2018


Article type: Paper
DOI: 10.1039/C8RA00257F
RSC Adv., 2018,8, 7550-7557
  • Open access: Creative Commons BY license
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    Luminescence and photoelectrochemical properties of size-selected aqueous copper-doped Ag–In–S quantum dots

    A. Raevskaya, O. Rozovik, A. Novikova, O. Selyshchev, O. Stroyuk, V. Dzhagan, I. Goryacheva, N. Gaponik, D. R. T. Zahn and A. Eychmüller, RSC Adv., 2018, 8, 7550
    DOI: 10.1039/C8RA00257F

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