首页|Optical thermometry based on upconversion emissions in Na3Gd (VO4)2: Yb3+-Er3+/Ho3+ micro crystals
Optical thermometry based on upconversion emissions in Na3Gd (VO4)2: Yb3+-Er3+/Ho3+ micro crystals
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NSTL
Elsevier
In several scientific and technical fields, contactless optical thermometry has been successfully used for precise local temperature sensing. One of the primary goals at the moment is to enhance sensitivity and resolution. In this work, we report the synthesis of crystalline Yb3+-Er3+ and Yb3+-Ho3+ co-doped Na3Gd(VO4)2 (NGVO) microparticles by a citrate-based sol-gel method. The phase purity, vibrational modes, morphology and luminescence characteristics were evaluated by X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), and Photoluminescence (PL). Temperature sensing in the visible region is allowed by an effective upconverted emission from rare-earth ions (Yb3+, Er3+, Ho3+) codoped into matrix. The luminescence intensity ratio (FIR) technique is used to record temperature sensing behaviors based on UC luminescence in Yb3+/Ln3+-codoped NGVO phosphors and high sensitivities were obtained. The Sr value of the NGVO Er3+/Yb3+ as a function of temperature are calculated to be 0.83% K?1. For the NGVO: Yb3+/Ho3+ phosphors, the Sr values were determined for TCLs and non-TCLs and reaches 1.37% K?1, and 1.90% K?1, respectively. These particles have a sub-degree thermal resolution at 295 K, making them excellent materials for accurate temperature sensing. The temperature-induced multicolor emissions in the analyzed samples suggest that the Er3+, Ho3+/Yb3+ co-doped NGVO crystals could have promising applications as a safety sign in high-temperature environments.
NSTL
Elsevier
