Hoang Nhu Van, Nguyen Tien Dung, Nguyen Van Hai, Cu Van Thai, Vu Thi Ngoc Minh, Nguyen Xuan Truong, Bui Thi Hoan, Pham Van Huan, Pham Hung Vuong

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This paper reported the impact of pH on the structure, morphology, and the green upconversion (UC) emission of Er/Yb/Mo tri-doped hydroxyapatite (HA) synthesized through hydrothermal method. X-ray diffraction confirmed that the pH of the solution strongly influenced the phase composition of the phosphors, and HA single phase was obtained at a high pH value. Transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) images of the phosphor exhibited rod-like morphology, and their length increased with increased of the pH values. Under laser-diode excitation wavelength of 975 nm, the phosphor showed typical upconversion emission bands of the  ion: strong green emission bands around 510-535/540-560 nm and weak red emission bands around 630-680 nm. The green and red emission intensity as a function of pH reached its maximum value at pH8. Finally, the emission intensity of

Keywords: Hydroxyapatite; Green emission; Hydrothermal method; up-conversion.


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