Near-infrared to visible and ultraviolet upconversion in TiO₂ thin films modified with Er and Yb

Abstract

TiO2:Er and TiO2:Er,Yb thin films deposited by magnetron sputtering showed upconversion from NIR to VIS with main emission in green (λem ≈ 525 nm). The higher content of activator and sensitizer resulted in increased upconversion and UV emission.

Hollow Bi5O7I:Er3+-Yb3+ Nanoflowers in Flexible Fibrous Membranes for Catalytic Purification and Temperature Monitoring

“…As is known to all, up-conversion (UC) can achieve the absorption of low-energy photons through the multiphoton process to emit high-energy photons and convert near-infrared light into visible light to improve catalytic efficiency, − which has potential applications in optical probing. In various optical probing, the fluorescence intensity ratio (FIR) technique involving optical thermometry has attracted much attention because of its rapid and accurate temperature acquisition, which can meet the needs of temperature monitoring under extreme environments. − This reaction mechanism of temperature feedback in collaboration with photocatalysis can monitor the optimal temperature of the photocatalytic reaction, which not only promotes the degradation of pollutants but also guarantees the safety of the whole possess. Besides, PAN is a polymer material with good fiber-forming properties, high chemical stability, and resistance to common solvents .…”