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Communication Dans Un Congrès Année : 2022

ZnO nanostructures for lightning, solar cells and gas sensors

Résumé

A great economic progress in white LEDs and photovoltaic (PV) markets is possible thanks to the use of lanthanide-free phosphors that are supposed to convert UV light into visible one, thanks to down-conversion (DS) process. ZnO nanoparticles (NPs) have aroused a growing interest, since due to the size reduction, they possess a variety of intrinsic defects (Zn vacancies and O interstitials). These defects can behave as efficient light-emitters, which provide light emission in the visible range. ZnO NPs naturally absorb the UV light thanks to a wide band gap of about 3.37 eV and it can also emit visible light, from yellow to red, depending on the nature of the crystalline and surface defects involved in the emission process. This is so-called “down-shifting”. However, the stability in time of their high photoluminescent quantum yield (PL QY) and easy to scale–up fabrication process (expected for industrial applications) are still challenging issues. Our collaborators from IRCELyon developed a quick and convenient chemical solution approach to get unique mesospheric self-assembly hybrid ZnO system with intense photoluminescent quantum yield of 40-75 % and stable visible emissions. This chemical process is industry-capable and cost effective. The use of a mixture of commercial polyacrylic acid-based polymers can provide large scale amounts of ZnO NPs in clear water suspensions that can be dried and dispersed again in water and the high PL QY is still preserved. The surface functionalization of ZnO NPs also influences their PL QY and the enhancement of this parameter is observed for some specific procedures applied during the synthesis process. ZnO NPs emitting in the visible spectral range can be applied for LED lightning as phosphors or the down-shifting layer on the top of solar cells in order to increase their efficiency in the UV spectral zone.
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Dates et versions

hal-03789960 , version 1 (27-09-2022)

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  • HAL Id : hal-03789960 , version 1

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Aleksandra Apostoluk, Malgorzata Sypniewska, Beata Derkowska-Zielinska, Bruno Masenelli, Stéphane Daniele. ZnO nanostructures for lightning, solar cells and gas sensors. RAFM-2022 – International Conference on Recent Advances in Functional Materials, Mar 2022, Delhi, India. ⟨hal-03789960⟩
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