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    • Dual-mode green emission and temperature sensing properties of rare-earth-element-doped biphasic calcium phosphate composites
    Authors: Dung Do Thi Thuy;  Advisor: Vu, Thi Ngoc Minh; Nguyen, Xuan Truong; Pham, Van Huan; Vuong-Pham Hung; Nguyen, Duy-Hung; Bui, Thi Hoan; Tu Le Manh; Hoang, Nhu Van;  Co-Author: - (2021)

    This work presents a novel multifunctional material synthesized by hydroxyapatite/ β-tricalcium phosphate (HA/β-TCP) doped with Er-Yb-Mo ions (using hydrothermal method) and its characterization, showing a peculiar property of green dual-mode emissions (up and down-conversions). It was found that the obtained material exhibits an intense green emission (510–560 nm) both via up-conversion (excited by 975 nm) and down-conversion (excited by 379 nm), which depend on the Mo6+ contents. Particularly, compared with the free-Mo6+ sample, the green emission intensities of the samples doped with 5% Mo6+ mol are 50 and 35 times higher for UC and DC emissions, respectively. Furthermore, the temp...