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A series of Ho3+-Yb3+-F− tri-doped TiO2 nanoparticles (abbreviated as UP-F-TiO2 NPs) were prepared using a hydrosol−hydrothermal method, and their phase structure, morphology and luminescent properties were investigated. These nanoparticles were utilized to prepare a photoanode of dye-sensitized solar cells (DSSCs). Based on the up-conversion spectra of UP-F-TiO2 NPs, an up-conversion mechanism is...
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