Abstract The codoped SiO2–Y2O3:Tb3+,Eu3+ (xTb: 1.0 mol%; xEu: 0.1; 0.2; 0.5; 0.7 and 1.0 mol%) nanomaterials were prepared at room temperature by sol-gel process and heat treated at 900 and 1000 °C during 4 h, under air atmosphere. The materials were characterized by X-ray powder diffraction (XRD) and UV excited photoluminescence. The material exhibits Y2O3 cubic, one peak positioned around 26° assigned to the cristobalite SiO2 phase and amorphous SiO2 phases due to the Y2O3 and SiO2 presences. The emission bands observed in the emission spectra under excitation at 301 are assigned to the Tb3+ and Eu3+ ions, with clear evidence of energy transfer from Tb3+ to Eu3+. The line assigned to the 5D0→7F2 transition (Eu3+) increase the intensity as a function of Eu3+ concentration. The sensibility under controlled temperature variation was investigate. The Eu3+: 0.5 mol% doped material (annealed @900 °C) exhibited higher thermic sensitivity (with maximum relative sensitivity 0.294% K−1 in 303 K). Under excitation at 395 nm, the red color emission increases the intensity due the thermal treatment. Furthermore, CIE parameters and the color correlated temperature (CCT) are discussed in order to characterize the greenish color emission. Based on the results, these luminescence materials may be potential candidates for optical thermometry diodes, solid-state lighting and nano in vivo biological system.

中文翻译：

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溶胶-凝胶法制备的SiO2–Y2O3:Eu3+,Tb3+基材料在不同原位温度下的光致发光性能

摘要 共掺杂 SiO2–Y2O3:Tb3+,Eu3+ (xTb: 1.0 mol%; xEu: 0.1; 0.2; 0.5; 0.7 and 1.0 mol%) 纳米材料是在室温下通过溶胶-凝胶工艺制备的，并在 900 和 1000 ° C 4 小时，在空气气氛下。通过X射线粉末衍射（XRD）和紫外激发光致发光对材料进行表征。由于 Y2O3 和 SiO2 的存在，该材料呈现出 Y2O3 立方体，一个位于 26°附近的峰被指定为方石英 SiO2 相和无定形 SiO2 相。在 301 激发下的发射光谱中观察到的发射谱带属于 Tb3+ 和 Eu3+ 离子，有明确的证据表明能量从 Tb3+ 转移到 Eu3+。指定给 5D0→7F2 跃迁 (Eu3+) 的线随着 Eu3+ 浓度增加强度。研究了受控温度变化下的敏感性。Eu3+: 0.5 mol% 掺杂材料（在 900 °C 下退火）表现出更高的热灵敏度（在 303 K 中的最大相对灵敏度为 0.294% K-1）。在 395 nm 激发下，由于热处理，红色发射增加了强度。此外，讨论了 CIE 参数和颜色相关温度 (CCT) 以表征绿色发射。基于这些结果，这些发光材料可能是光学测温二极管、固态照明和纳米体内生物系统的潜在候选材料。讨论了 CIE 参数和颜色相关温度 (CCT) 以表征绿色发射。基于这些结果，这些发光材料可能是光学测温二极管、固态照明和纳米体内生物系统的潜在候选材料。讨论了 CIE 参数和颜色相关温度 (CCT) 以表征绿色发射。基于这些结果，这些发光材料可能是光学测温二极管、固态照明和纳米体内生物系统的潜在候选材料。