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Although in the last decades rare earths (REs)-containing materials have been proposed as active media in Si compatible light sources, the reached optical efficiency is still limited by the low REs excitation cross section. In this work, the introduction of Bi as an Er sensitizer in a Si-compatible yttrium oxide thin film has been proposed in order to overcome this limit. The stabilization of optically active Bi3+ ions in place of Y3+ in the two reticular sites, S6 and C2, of Y2O3 was demonstrated. Photoluminescence (PL) and photoluminescence excitation measurements have revealed the existence of two different intense emission bands in the visible range ascribed to Bi3+ in the two reticular sites. They can be selectively excited by properly changing the excitation wavelength. Moreover, the Bi3+→Er3+ energy transfer processes in the (Bi+Er)-codoped samples were demonstrated for both Bi3+ sites by the spectral overlap …
Publication date: 
1 Nov 2017

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

Biblio References: 
Volume: 191 Pages: 92-96
Journal of Luminescence