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The process of energy transfer (ET) between optically active ions has been widely studied to improve the optical efficiency of a system for different applications, from lighting and photovoltaics to silicon microphotonics. In this work, we report the influence of Bi on the Er optical emission in erbium-yttrium oxide thin films synthesized by magnetron co-sputtering. We demonstrate that this host permits to well dissolve Er and Bi ions, avoiding their clustering, and thus to stabilize the optically active Er3+ and Bi3+ valence states. In addition, we establish the ET occurrence from Bi3+ to Er3+ by the observed Bi3+ PL emission decrease and the simultaneous Er3+ photoluminescence (PL) emission increase. This was further confirmed by the coincidence of the Er3+ and Bi3+ excitation bands, analyzed by PL excitation spectroscopy. By increasing the Bi content of two orders of magnitude inside the host, though the occurrence …
AIP Publishing LLC
Publication date: 
27 Jul 2015

Adriana Scarangella, Riccardo Reitano, Giorgia Franzò, Francesco Priolo, Maria Miritello

Biblio References: 
Volume: 107 Issue: 4 Pages: 041908
Applied Physics Letters