Highly Sensitive Dual-Phase Nanoglass-Ceramics Self-Calibrated Optical Thermometer
2016
Chen, Daqin | Wan, Zhongyi | Liu, Shen
A strategy to achieve high sensitivity of noncontact optical thermometer via the structure design of nanoglass-ceramic and the usage of Ln³⁺ (Ln = Eu, Tb, Dy) luminescence as reference signal and Cr³⁺ emission as temperature signal was provided. Specifically, the synthesized dual-phase glass-ceramics were evidenced to enable spatially confined doping of Ln³⁺ in the hexagonal GdF₃ nanocrystals and Cr³⁺ in the cubic Ga₂O₃ nanoparticles, being beneficial to suppressing detrimental energy transfer between Ln³⁺ and Cr³⁺ and thus significantly enhancing their luminescence. As a consequence, completely different temperature-sensitive luminescence of Ln³⁺4f → 4f transition and Cr³⁺ 3d → 3d transition in the present glass-ceramic resulted in obvious variation of Cr³⁺/Ln³⁺ fluorescence intensity ratio with temperature and strikingly high detecting temperature sensitivity of 15–22% per K. We believe that this preliminary study will provide an important advance in exploring other innovative optical thermometry.
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