Core-Shell ZnO:Ga-SiO.sub.2./sub. nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation

0517113 - FZÚ 2020 RIV GB eng J - Journal Article
Procházková, Lenka - Vaněček, V. - Čuba, V. - Pjatkan, R. - Martinez-Turtos, R. - Jakubec, Ivo - Buryi, Maksym - Omelkov, S. - Auffray, E. - Lecoq, P. - Mihóková, Eva - Nikl, Martin
Core-Shell ZnO:Ga-SiO₂ nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation.
RSC Advances. Roč. 9, č. 50 (2019), s. 28946-28952. E-ISSN 2046-2069
R&D Projects: GA ČR GA17-06479S; GA MŠMT(CZ) EF16_019/0000760
EU Projects: European Commission(XE) 690599 - ASCIMAT
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; COST(XE) TD1401
Institutional support: RVO:68378271 ; RVO:61388980
Keywords : ZnO * SiO₂ * nanoparticles * luminescence
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Inorganic and nuclear chemistry (UACH-T)
Impact factor: 3.119, year: 2019
Method of publishing: Open access

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.
Permanent Link: http://hdl.handle.net/11104/0302400