Śliz Anna, Radecka Marta, Jeleń Piotr, Dorosz Dominik, Zakrzewska Katarzyna
Faculty of Materials Science and Ceramics, AGH University of Science and Technology al. A. Mickiewicza 30 30-059 Kraków Poland
Faculty of Computer Science, Electronics and Telecommunications, AGH University of Science and Technology al. A. Mickiewicza 30 30-059 Kraków Poland.
RSC Adv. 2023 Mar 7;13(11):7402-7412. doi: 10.1039/d2ra08305a. eCollection 2023 Mar 1.
Upconversion as a modification strategy to enhance the utilization of sunlight in titanium dioxide photoanodes with an internal upconverter was investigated. TiO thin films containing an Er activator and Yb sensitizer were deposited in the magnetron sputtering process on conducting glass, amorphous silica, and silicon. Scanning electron microscopy, energy dispersive spectroscopy, grazing incidence X-ray diffraction, and X-ray absorption spectroscopy allowed assessment of the thin film composition, structure, and microstructure. Optical and photoluminescence properties were measured by means of spectrophotometry and spectrofluorometry. Changing the content of Er (1, 2, 10 at%) and Yb (1, 10 at%) ions allowed us to achieve thin film upconverters with a crystallized and amorphous host. Upon 980 nm laser excitation Er exhibits upconversion with the main emission in green (H → I, ≈ 525 nm) and weak emission in red (F → I, ≈ 660 nm). For a thin film with a higher ytterbium content (10 at%) a significant increase in red emission and upconversion from NIR to UV was observed. The average decay times of green emission for TiO:Er and TiO:Er,Yb thin films were calculated based on time-resolved emission measurements.
研究了上转换作为一种改性策略，用于增强含内部上转换剂的二氧化钛光阳极中太阳光的利用。在磁控溅射过程中，将含有铒激活剂和镱敏化剂的二氧化钛薄膜沉积在导电玻璃、无定形二氧化硅和硅上。通过扫描电子显微镜、能量色散光谱、掠入射X射线衍射和X射线吸收光谱对薄膜的成分、结构和微观结构进行了评估。利用分光光度法和荧光分光光度法测量了光学和光致发光性能。通过改变铒（1、2、10原子%）和镱（1、10原子%）离子的含量，我们获得了具有结晶和非晶主体的薄膜上转换剂。在980nm激光激发下，铒表现出上转换，主要发射光为绿色（H→I，≈525nm），红色发射较弱（F→I，≈660nm）。对于镱含量较高（10原子%）的薄膜，观察到红色发射显著增加以及从近红外到紫外的上转换。基于时间分辨发射测量计算了TiO:Er和TiO:Er,Yb薄膜绿色发射的平均衰减时间。
