Pr³⁺，Tb³⁺共掺杂的NaGd(MoO₄)₂荧光粉光学温度传感特性研究

Studies on the Optical Temperature Sensing Properties of Pr³⁺, Tb³⁺ Co-Doped NaGd(MoO₄)₂ Fluorescent Powder

摘要: 水热法获得了Pr³⁺，Tb³⁺共掺杂的NaGd(MoO₄)₂荧光粉。通过X射线衍射仪和场发射扫描电子显微镜观察了微观下的样品结构和形貌。测量室温下的激发光谱和不同温度下的发射光谱，发现Pr³⁺，Tb³⁺共掺杂的NaGd(MoO₄)₂粉末在276 nm激发下，温度发生变化时，Tb³⁺的激发光谱在544.5 nm(⁵D₄-⁷F₅)位置发射峰的荧光强度变化剧烈，而Pr³⁺在605 nm (¹D₂-³H₄)变化较慢。计算发现，温度上升后，材料荧光强度比(FIR)值升高明显。计算结果显示相对灵敏度的最大值出现在434.2 K为2.92% K⁻¹，是一种较为优秀的温度传感材料。除此之外，样品的发光颜色在298~483 K的温度范围内由绿转红，便于直接观察待测温度。

Abstract: The Pr³⁺, Tb³⁺ co-doped NaGd(MoO₄)₂ phosphor was gained using hydrothermal approach. The structure and morphology of the samples under microscopy were studied by X-ray diffractometer and field emission scanning electron microscopy. The excitation spectra at room temperature and the emission spectra at different temperatures were measured, and the excitation spectra of Pr³⁺, Tb³⁺ co-doped NaGd(MoO₄)₂ powder at 276 nm excitation were found that the fluorescence intensity values of the emission peak at 544.5 nm (⁵D₄-⁷F₅) for Tb³⁺ varied more significantly with temperature compared to Pr³⁺ at 605 nm (¹D₂-³H₄). It was calculated that the fluorescence intensity ratio (FIR) values increased with increasing temperature and could be used for temperature sensing. The maximum value of the relative sensitivity of the phosphor appeared at 434.2 K for 2.92% K⁻¹, which is a more excellent temperature sensing material. In addition, the luminous color of the sample changes from green to red in the temperature range of 298~483 K, which is convenient for directly observing the temperature to be measured.