Issue 27, 2025, Issue in Progress

Microemulsion synthesis and optical temperature sensor properties in HA/β-TCP composite phosphors

Abstract

Herein, a novel microemulsion (ME) method for the synthesis of rare earth-element-doped hydroxyapatite (HA)/beta-tricalcium phosphate (β-TCP) composite phosphors was performed and yielded phosphors with intense green upconversion (UC) emission and high temperature sensitivity. The effect of polyvinyl alcohol (PVA) content on the structure and luminescence properties of the phosphors was investigated in detail. X-ray diffraction and Raman spectra showed that the mixed phases included the main hexagonal HA phase and the secondary orthorhombic β-TCP phase. Under 975 nm excitation, the obtained phosphors exhibited strong green UC emission, and their intensity depended on PVA content. Notably, the fluorescence intensity ratio technique revealed that the phosphors had a high color purity of up to 94.77% and high temperature sensitivity of 0.93% K−1 at 293 K. These results indicate that the phosphors are suitable for applications in thermal sensors and optoelectronic devices.

Graphical abstract: Microemulsion synthesis and optical temperature sensor properties in HA/β-TCP composite phosphors

Article information

Article type
Paper
Submitted
09 Apr 2025
Accepted
30 May 2025
First published
25 Jun 2025
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2025,15, 21687-21699

Microemulsion synthesis and optical temperature sensor properties in HA/β-TCP composite phosphors

C. X. Thang, D. Nguyen, V. Pham, N. V. Tung, D. D. Bich and H. N. Van, RSC Adv., 2025, 15, 21687 DOI: 10.1039/D5RA02458G

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