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A promising approach to obtain light emission from Si-based materials is represented by doping with rare earths and in particular with Eu. In this paper the comparison of the performances of SiO2 and SiOC layers as host matrices for optically active Eu ions is presented. A SiO2 matrix allows to observe light emission from both Eu2+ and Eu3+ ions, owing to a proper tuning of the thermal annealing process used to optically activate the rare earth. However the photoluminescence efficiency of both ions remains relatively low and quite far from the requirements for technological applications, mainly due to the extensive formation of Eu-containing precipitates. A detailed study of the structural and optical properties of these layers allowed us to analyze and elucidate the clustering process and to find suitable strategies to minimize it. We found that the substitution of the SiO2 matrix with a SiOC film allows to obtain a very …
International Society for Optics and Photonics
Publication date: 
1 May 2014

G Franzò, G Bellocchi, S Boninelli, M Miritello, F Iacona

Biblio References: 
Volume: 9133 Pages: 913307
Silicon Photonics and Photonic Integrated Circuits IV