Abstract
Single phase TiO2:Sm3+ thin films (anatase: A‐ or rutile: R‐) have been fabricated on Si substrates by laser ablation with controlled O2 pressure during film preparation. Visible photoluminescence (PL) originating from the intra‐4f transitions in Sm3+ ions were observed at room temperature. The A‐TiO2:Sm3+ thin films exhibited more intense Sm3+‐related PL than that of R‐TiO2:Sm3+, resulting from the difference of Sm3+ configuration in the host crystal matrixes. A phase transition from anatase to rutile of the host changed the local crystal symmetry of the Sm3+ ions and extinguished the Sm3+‐related PL, even there was no significant change on the Sm concentration.
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