Core–shell ZnO:Ga-SiO2 nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation

Heat treatment is needed to increase the luminescence intensity of ZnO:Ga particles, but it comes at the cost of higher particle agglomeration. Higher agglomeration results in low transparency of scintillating powder when embedded in a matrix and constitutes one of the biggest disadvantages, besides...

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Published inRSC advances Vol. 9; no. 50; pp. 28946 - 28952
Main Authors Prochzková, Lenka, Vaněček, Vojtěch, Čuba, Václav, Pjatkan, Radek, Martinez-Turtos, Rosana, Jakubec, Ivo, Buryi, Maksym, Omelkov, Sergey, Auffray, Etiennette, Lecoq, Paul, Mihóková, Eva, Nikl, Martin
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 17.09.2019
The Royal Society of Chemistry
Subjects
Agglomerated defects
Chemistry
Constraining
Crystallites
Heat treatment
Luminescence
Nanocrystals
Polystyrene resins
Silicon dioxide
Stopping power
Surface defects
Zinc oxide
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Summary:Heat treatment is needed to increase the luminescence intensity of ZnO:Ga particles, but it comes at the cost of higher particle agglomeration. Higher agglomeration results in low transparency of scintillating powder when embedded in a matrix and constitutes one of the biggest disadvantages, besides low light yield and low stopping power, of ZnO:Ga powder. Limiting ZnO:Ga particle size is therefore a key step in order to prepare highly luminescent and transparent composites with prospects for optical applications. In this work, SiO2 coating was successfully used to improve luminescence intensity or limitation of crystallite size growth during further annealing. Furthermore, ZnO:Ga and ZnO:Ga-SiO2 core–shells were embedded in a polystyrene matrix.
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ISSN:2046-2069
DOI:10.1039/c9ra04421c