Abstract Tellurite-zinc glasses doped with Er3+, Yb3+ and Tm3+ were fabricated by conventional melt-quenching technique and characterised by absorption spectroscopy, refractive index, lifetime measurements, excitation, luminescence and up-conversion spectroscopy. Tunable blue to cold white light emission based on the colour mixing of red, green and blue light was obtained via up-conversion under 980 nm and by adjusting the laser excitation intensity. The balancing of the relative intensity of each colour is provided by the energy transfer process between the rare-earth ions. Moreover, luminescence spectroscopy was performed with a 405 nm laser to further understand the energy transfer mechanism that produce the white light. The Judd-Ofelt intensity parameters ( Ω 2 , Ω 4 and Ω 6 ) were calculated for all samples and present the trend Ω 2 > Ω 4 > Ω 6 . The spectroscopic parameters were computed with the Judd-Ofelt theory as well as the energy transfer micro-parameters (critical radius of interaction and energy transfer coefficient). Such results shall be used to give a comprehensive explanation for the energy transfer process between these rare earth ions.

中文翻译：

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掺有 Er3+–Yb3+–Tm3+ 的碲酸盐-锌玻璃在 980 nm 下的冷白光发射

摘要 采用常规熔体淬火技术制备了掺有 Er3+、Yb3+ 和 Tm3+ 的碲石锌玻璃，并通过吸收光谱、折射率、寿命测量、激发、发光和上转换光谱进行了表征。通过 980 nm 下的上转换和调整激光激发强度，获得基于红、绿和蓝光的颜色混合的可调谐蓝色至冷白光发射。每种颜色的相对强度的平衡是由稀土离子之间的能量转移过程提供的。此外，还使用 ​​405 nm 激光进行了发光光谱分析，以进一步了解产生白光的能量转移机制。计算所有样品的 Judd-Ofelt 强度参数（Ω 2 、Ω 4 和 Ω 6 ）并呈现趋势 Ω 2 > Ω 4 > Ω 6 。光谱参数使用 Judd-Ofelt 理论以及能量转移微参数（相互作用的临界半径和能量转移系数）计算。这些结果将用于对这些稀土离子之间的能量传递过程给出一个全面的解释。