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首页> 外文期刊>RSC Advances >Optical temperature sensing properties of Yb3+-Er3+ co-doped NaLnTiO(4) (Ln = Gd, Y) up-conversion phosphors
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Optical temperature sensing properties of Yb3+-Er3+ co-doped NaLnTiO(4) (Ln = Gd, Y) up-conversion phosphors

机译：Yb3 + -Er3 +共掺杂NaLnTiO（4）（Ln = Gd，Y）上转换磷光体的光学温度传感特性

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摘要

Yb3+-Er3+ ion co-doped NaLnTiO(4) (Ln = Y, Gd) up-conversion (UC) phosphors were successfully synthesized by a sol-gel method. The phase purity and the structure of the samples were characterized by powder X-ray diffraction (XRD), and the optimal compositions were also determined according to their UC emission intensities. The samples emit orange light and their UC spectra were recorded with excitation by a laser diode with a 980 nm wavelength. The UC luminescence intensity could be enhanced greatly after introducing sensitizer Yb3+ ions, and the energy transfer (ET) from Yb3+ to Er3+ plays a vital role. The UC mechanism and processes responsible for the emissions were investigated and found to involve two-photon absorption. The lifetime of green emission in Er3+ singly doped and Yb3+-Er3+ co-doped samples were measured to prove the existence of ET. The temperature dependence of the fluorescence intensity ratios (FIR) for the two green UC emission bands peaked at 530 and 550 nm was studied in the range of 300-510 K under excitation by a 980 diode laser with about 4 W cm(-2) power density, and the maximum sensitivity was approximately 0.0045 K-1 at 510 K for NaYTiO4 and 480 K for NaGdTiO4. This indicates that Yb3+-Er3+ ion co-doped NaLnTiO(4) (Ln = Y, Gd) phosphors are potential candidates for optical temperature sensors.
机译：通过溶胶-凝胶法成功合成了Yb3 + -Er3 +离子共掺杂的NaLnTiO（4）（Ln = Y，Gd）上转换（UC）荧光粉。通过粉末X射线衍射（XRD）表征样品的相纯度和结构，并根据其UC发射强度确定最佳组成。样品发出橙色光，并用波长为980 nm的激光二极管激发记录其UC光谱。引入敏化剂Yb3 +离子后，UC发光强度可以大大提高，并且从Yb3 +到Er3 +的能量转移（ET）起着至关重要的作用。研究了负责排放的UC机理和过程，发现涉及双光子吸收。测量了Er3 +单掺杂和Yb3 + -Er3 +共掺杂样品中绿色发射的寿命，以证明存在ET。在约4 W cm（-2）的980二极管激光激发下，在300-510 K的范围内研究了峰值在530和550 nm的两个绿色UC发射带的荧光强度比（FIR）的温度依赖性。功率密度，NaYTiO4的最大灵敏度约为510 K，而NaGdTiO4的最大灵敏度约为480K。这表明Yb3 + -Er3 +离子共掺杂的NaLnTiO（4）（Ln = Y，Gd）荧光粉是光学温度传感器的潜在候选材料。

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