New strategies to improve Eu light emission in SI-based matrices

G. Franzò; G. Bellocchi; S. Boninelli; M. Miritello; F. Iacona

doi:10.1117/12.2052151

1 May 2014 New strategies to improve Eu light emission in SI-based matrices

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

Proceedings Volume 9133, Silicon Photonics and Photonic Integrated Circuits IV; 913307 (2014) https://doi.org/10.1117/12.2052151
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

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 bright light emission at about 440 nm from Eu²⁺ ions. In fact SiOC is able to efficiently promote the Eu reduction; furthermore, Eu ions are characterized by an enhanced mobility and solubility in this matrix and, as a consequence, Eu precipitation is strongly reduced. Finally, by taking advantage of the dependence of the photoluminescence peak position on the Eu concentration, an intense white emission is obtained at room temperature by combining two layers with different Eu contents. Since SiOC is a material fully compatible with standard Si technology, Eu-doped SiOC layers can be considered a highly interesting candidate for applications in photonics or in solid-state lighting.

Citation Download Citation

G. Franzò, G. Bellocchi, S. Boninelli, M. Miritello, and F. Iacona "New strategies to improve Eu light emission in SI-based matrices", Proc. SPIE 9133, Silicon Photonics and Photonic Integrated Circuits IV, 913307 (1 May 2014); https://doi.org/10.1117/12.2052151

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KEYWORDS

Europium

Silica

Ions

Annealing

Oxygen

Silicon

Transmission electron microscopy

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