Ag2ZnSnS4–ZnS core–shell colloidal quantum dots: a near-infrared luminescent material based on environmentally friendly elements

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Document typeArticle
Defense date2021-05-07
PublisherRSC
Rights accessOpen Access
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ProjectHEINSOL - Hierarchically Engineered Inorganic Nanomaterials from the atomic to supra-nanocrystalline level as a novel platform for SOLution Processed SOLar cells (EC-H2020-725165)
FOTODETECTORES INFRARROJOS BASADOS EN PUNTOS QUANTICOS Y MATERIALES 2D DE BAJO COSTE Y ALTO RENDIMIENTO (AEI-TEC2017-88655-R)
FOTODETECTORES INFRARROJOS BASADOS EN PUNTOS QUANTICOS Y MATERIALES 2D DE BAJO COSTE Y ALTO RENDIMIENTO (AEI-TEC2017-88655-R)
Abstract
Low cost, multinary colloidal quantum dots (QDs) based on environmentally friendly elements, with bright, narrow-width, tunable near-infrared (NIR) luminescence are promising alternatives to Cd and Pb chalcogenide QDs for in vivo bio-imaging, LED and sensing applications. Herein, we demonstrate Pb/Cd free solution-processed colloidal luminescent Ag2ZnSnS4–ZnS (AZTS–ZnS) core–shell QDs with precise control over the ZnS shell thickness and thereby its optical properties. Unlike indium based multinary (I–III–VI group) core–shell QDs these nanocrystals show a narrow photoluminescence (PL) full width at half maximum (fwhm) of 105–110 meV in the first NIR window. By monitoring the starting AZTS core size, we achieve tunable emission over a small NIR window in these QDs with the best PL quantum yield (PLQY) of 17.4%.
CitationSaha, A.; Konstantatos, G. Ag2ZnSnS4–ZnS core–shell colloidal quantum dots: a near-infrared luminescent material based on environmentally friendly elements. "Ag2ZnSnS4–ZnS core–shell colloidal quantum dots: a near-infrared luminescent material based on environmentally friendly elements", 7 Maig 2021, vol. 9, núm. 17, p. 5682.
Publisher versionhttps://pubs.rsc.org/en/content/articlelanding/2021/tc/d1tc00421b
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