TiO:Yb,Er films with different concentrations of Mn are grown on SiO glass substrates by pulsed laser deposition. It is found that the introduction of Mn enhanced the intensity of upconversion emission. In particular, TiO:Yb,Er thin film with 5% Mn ions exhibits the brightest upconversion emission. The upconversion red emission intensity is increased by 2.5-fold than that of a TiO:Yb,Er thin film without Mn ions, which is ascribed to the multi-photon absorption and efficient exchange-energy transfer process between Er and Mn. The high transmittance and good conductivity of the films made them possible to act as electron transport layer in solar cells.
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