Abstract Nanoparticles of Eu3+ doped TiO2 have been synthesized by the hydrothermal technique. Structural, morphological, and luminescence characteristics of the nanophosphors were examined in detail. The powder X-ray diffraction pattern reveals that below 9 mol% concentration of Eu3+ doped TiO2, all samples show the anatase phase with tetragonal structure. The photoluminescence studies showed that as-synthesized samples exhibited excellent luminescence property due to the conversion of energy from the host matrix to europium ions. The Judd− Ofelt (JO) analysis was used to study the such spectroscopic parameters as branching ratio, emission cross-section, gain bandwidth, and gain coefficient for all the samples. The concentration quenching was seen and this may be due to the nonradiative energy transfer by the multipole-multipole mechanism. The emission spectra were recorded under the excitation at 376 nm revealed enhanced asymmetric ratios. That confirms the improved color purity (97%) for all the samples. The color coordinates of 1–11 mol% Eu3+ doped TiO2 samples were calculated by Commission international del’ Eclirage (CIE) algorithm and they and are in good agreement with standard NTSC coordinates (0.62, 0.37) of optimized concentration of Eu3+ doped TiO2 sample. Thus, the samples are promising candidates for such applications as lighting, displays, and laser systems.

中文翻译：

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使用 Judd-Ofelt 理论的光吸收强度分析和发红光的 Eu3+: TiO2 纳米粒子的光致发光研究

摘要 利用水热技术合成了Eu3+掺杂的TiO2纳米颗粒。详细检查了纳米磷光体的结构、形态和发光特性。粉末 X 射线衍射图表明，低于 9 mol% 浓度的 Eu3+ 掺杂 TiO2，所有样品均显示具有四方结构的锐钛矿相。光致发光研究表明，由于能量从主体基质转化为铕离子，因此合成的样品表现出优异的发光特性。Judd-Ofelt (JO) 分析用于研究所有样品的分光比、发射截面、增益带宽和增益系数等光谱参数。观察到浓度猝灭，这可能是由于多极-多极机制的非辐射能量转移。在 376 nm 激发下记录的发射光谱显示不对称比率增强。这证实了所有样品的色纯度提高 (97%)。1–11 mol% Eu3+ 掺杂 TiO2 样品的颜色坐标是通过 Commission international del' Eclirage (CIE) 算法计算的，它们与标准 NTSC 坐标 (0.62, 0.37) 的 Eu3+ 掺杂 TiO2 样品的优化浓度非常吻合。因此，这些样品是照明、显示器和激光系统等应用的有希望的候选者。1–11 mol% Eu3+ 掺杂 TiO2 样品的颜色坐标是通过 Commission international del' Eclirage (CIE) 算法计算的，它们与标准 NTSC 坐标 (0.62, 0.37) 的 Eu3+ 掺杂 TiO2 样品的优化浓度非常吻合。因此，这些样品是照明、显示器和激光系统等应用的有希望的候选者。1-11 mol% Eu3+ 掺杂 TiO2 样品的颜色坐标是通过 Commission international del' Eclirage (CIE) 算法计算的，它们与标准 NTSC 坐标 (0.62, 0.37) 的 Eu3+ 掺杂 TiO2 样品的优化浓度非常吻合。因此，这些样品是照明、显示器和激光系统等应用的有希望的候选者。