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Crystal-field Stark effect on the upconversion light emission spectrum ofα−NaYF4nanoparticles doped withDy3+,Er3+, orYb3+
Physical Review B ( IF 3.2 ) Pub Date : 2022-09-30 , DOI: 10.1103/physrevb.106.125427 A. F. García-Flores , E. D. Martínez , J. Munevar , D. J. Garcia , P. S. Cornaglia , F. Fabris , R. R. Urbano , C. Rettori
Physical Review B ( IF 3.2 ) Pub Date : 2022-09-30 , DOI: 10.1103/physrevb.106.125427 A. F. García-Flores , E. D. Martínez , J. Munevar , D. J. Garcia , P. S. Cornaglia , F. Fabris , R. R. Urbano , C. Rettori
nanoparticles (NPs) form in two crystal structures, cubic (-phase) and hexagonal (-phase), each one presenting a different crystal electric field (CEF) Stark effect, that affects the upconversion (UC) light emission of the NPs when doped with rare-earth elements. Therefore, the knowledge of the CEF parameters, the wave functions, and energy levels of the rare earth (RE) -multiplet is expected to be of great help for the understanding and improvement of the UC light emission. In this work, -phase NPs doped with , or were investigated by means of magnetization, electron spin resonance (ESR), and optical spectroscopy techniques. Fittings of the temperature- and magnetic-field-dependent magnetization were performed to determine the fourth- and sixth-order cubic CEF parameters, and . The ground state of , and in these NPs was confirmed by low-temperature ESR experiments. The obtained CEF parameters were used to write down a total Hamiltonian that allows to determine the CEF Stark splitting for all energy levels of the REs unfilled shell. We give details of how the Stark effect affects the overall energy splitting of the various -multiplets and may explain the fine structure of the UC light emission in these cubic NPs.
中文翻译:
晶体场斯塔克效应对掺杂 Dy3+、Er3+ 或 Yb3+ 的 α-NaYF4 纳米粒子上转换发光光谱的影响
纳米粒子 (NPs) 以两种晶体结构形式形成,立方 (-相)和六角形(相),每个都呈现不同的晶体电场(CEF)斯塔克效应,当掺杂稀土元素时,该效应会影响纳米粒子的上转换(UC)光发射。因此,了解稀土(RE)的 CEF 参数、波函数和能级-multiplet有望对UC发光的理解和改进有很大帮助。在这项工作中,-阶段NPs 掺杂, 或者通过磁化,电子自旋共振(ESR)和光谱技术进行了研究。进行温度和磁场相关磁化的拟合以确定四阶和六阶立方 CEF 参数,和. 的基态, 和在这些NPs 通过低温 ESR 实验得到证实。获得的 CEF 参数用于记下总哈密顿量,该量允许确定 RE 的所有能级的 CEF Stark 分裂未填充的外壳。我们详细说明了斯塔克效应如何影响各种能量的整体分裂-multiplet 并且可以解释这些立方中 UC 光发射的精细结构NP。
更新日期:2022-09-30
中文翻译:
晶体场斯塔克效应对掺杂 Dy3+、Er3+ 或 Yb3+ 的 α-NaYF4 纳米粒子上转换发光光谱的影响
纳米粒子 (NPs) 以两种晶体结构形式形成,立方 (-相)和六角形(相),每个都呈现不同的晶体电场(CEF)斯塔克效应,当掺杂稀土元素时,该效应会影响纳米粒子的上转换(UC)光发射。因此,了解稀土(RE)的 CEF 参数、波函数和能级-multiplet有望对UC发光的理解和改进有很大帮助。在这项工作中,-阶段NPs 掺杂, 或者通过磁化,电子自旋共振(ESR)和光谱技术进行了研究。进行温度和磁场相关磁化的拟合以确定四阶和六阶立方 CEF 参数,和. 的基态, 和在这些NPs 通过低温 ESR 实验得到证实。获得的 CEF 参数用于记下总哈密顿量,该量允许确定 RE 的所有能级的 CEF Stark 分裂未填充的外壳。我们详细说明了斯塔克效应如何影响各种能量的整体分裂-multiplet 并且可以解释这些立方中 UC 光发射的精细结构NP。