Abstract
12CaO·7Al2O3 (C12A7) single crystal had extraordinary application in optical field, owing to its special structure. Here, Yb3+ and Er3+ co-doped C12A7 single crystal (Er3+/Yb3+/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−1 and 850 cm−1, which belonged to the frame structure of C12A7 single crystal. The band gap of Er3+/Yb3+/C12A7 single crystal was 4.25 eV, which reduced the temperature quenching of Ln3+ ions. Raman scattering spectra showed that the highest phonon energy of C12A7 single crystal was about 880 cm−1, which was beneficial for upconversion emission. The temperature sensitivity coefficient of Er3+/Yb3+/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 Er3+/Yb3+/C12A7 single crystal increased. Moreover, absolute sensitivity (SA) of single crystal of Er3+/Yb3+/C12A7 increased with the increasing of temperature, suggesting single crystal was suitable for detecting high temperature.
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