Dual-mode green emission and temperature sensing properties of rare-earth-element-doped biphasic calcium phosphate composites

• Published in: Journal of alloys and compounds Vol. 871; p. 159483
• Main Authors: Thuy, Dung Do Thi, Minh, Vu Thi Ngoc, Xuan, Truong Nguyen, Huan, Pham Van, Hung, Vuong-Pham, Nguyen, Duy-Hung, Hoan, Bui Thi, Manh, Tu Le, Van, Hoang Nhu
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.08.2021; Elsevier BV
• Subjects: Calcium phosphates; Composite; Dual-mode emission; Emission spectra; Erbium; Fluorescence; Green emission; High temperature; Hydroxyapatite; Hydroxyapatite/tricalcium phosphate; Optical temperature sensing; Phosphors; Rare earth elements; Ytterbium; Optical temperature sensing; Green emission; Dual-mode emission; Composite; Hydroxyapatite/tricalcium phosphate
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.159483

•Dual-mode intense green emission of HA/β-TCP: Er-Yb-Mo composite synthesized by hydrothermal method.•Mo6+ doped system enhances strongly both UC and DC green emissions.•Dual-mode mechanism of HA/β-TCP:Er-Yb-Mo phosphor has explained.•Good temperature sensing property was obtained. [Display omitted] 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 temperature sensing property of the HA/β-TCP: Er-Yb-Mo composite is investigated by fluorescence intensity ratio (FIR) technique, showing a high and competitive sensitivity with a maximum value of 0.0064 K−1 at 403 K. The results indicated that the HA/β-TCP: Er-Yb-Mo phosphor can be useful for high-temperature-sensing applications.