School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China.
NHC Key Laboratory of Hormones and Development (Tianjin Medical University), Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin, 300134, China.
Talanta. 2020 Jan 15;207:120292. doi: 10.1016/j.talanta.2019.120292. Epub 2019 Aug 22.
12CaO·7AlO (C12A7) single crystal had extraordinary application in optical field, owing to its special structure. Here, Yb and Er co-doped C12A7 single crystal (Er/Yb/C12A7) were prepared by Czochralski method. XRD patterns of C12A7 single crystal performed a single diffraction peak, indicating that pure single structure was achieved. With over-stoichiometric ratio, infrared absorption spectrum had two peaks between 600 cm and 850 cm, which belonged to the frame structure of C12A7 single crystal. The band gap of Er/Yb/C12A7 single crystal was 4.25 eV, which reduced the temperature quenching of Ln ions. Raman scattering spectra showed that the highest phonon energy of C12A7 single crystal was about 880 cm, which was beneficial for upconversion emission. The temperature sensitivity coefficient of Er/Yb/C12A7 polycrystal and single-crystal were 1124.81 and 1122.69 range from 373 K to 573 K, respectively. Compared with polycrystal, sensitivity coefficient of Er/Yb/C12A7 single crystal increased. Moreover, absolute sensitivity (S) of single crystal of Er/Yb/C12A7 increased with the increasing of temperature, suggesting single crystal was suitable for detecting high temperature.
12CaO·7AlO(C12A7)单晶因其特殊的结构，在光学领域具有非凡的应用。本文采用提拉法制备了 Yb、Er 共掺 C12A7 单晶(Er/Yb/C12A7)。C12A7 单晶的 XRD 图谱表现出单一的衍射峰，表明获得了纯单相结构。在过计量比的情况下，红外吸收光谱在 600-850cm-1 之间有两个峰，这属于 C12A7 单晶的骨架结构。Er/Yb/C12A7 单晶的带隙为 4.25eV，降低了 Ln 离子的温度猝灭。拉曼散射光谱表明，C12A7 单晶的最高声子能量约为 880cm-1，有利于上转换发射。在 373-573K 温度范围内，Er/Yb/C12A7 多晶和单晶的温度灵敏度系数分别为 1124.81 和 1122.69 范围。与多晶相比，Er/Yb/C12A7 单晶的灵敏度系数增大。此外，随着温度的升高，Er/Yb/C12A7 单晶的绝对灵敏度(S)增加，表明单晶适用于高温检测。
