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Phase transition, radio- and photoluminescence of K3Lu(PO4)2 doped with Pr3+ ions
Journal of Luminescence ( IF 3.6 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jlumin.2020.117749
Konstantin V. Ivanovskikh , Vladimir A. Pustovarov , Sergey Omelkov , Marco Kirm , Fabio Piccinelli , Marco Bettinelli

Abstract Luminescent characteristics of K3Lu(PO4)2:Pr3+ (1 and 5 mol.%) microcrystalline powders, a promising optical material for scintillation applications, were investigated using various experimental techniques. The material shows emission features connected with both high intensity interconfigurational 4f15d→4f2 transitions (broad UV emission bands) and intraconfigurational 4f2→4f2 transitions (weak emission lines in the visible range). The output of X-ray excited 4f15d→4f2 emission of Pr3+ increases with a temperature rise from 90 K to room temperature and higher depending on the Pr3+ ions concentration. The high 5% concentration of Pr3+ ions is found to be favourable for the stabilization of a monoclinic phase (P21/m space group) over a trigonal one (P 3 ¯ space group) while emission properties of the material reveal that a phase transition occurs at higher temperatures. Decay kinetics of Pr3+ 4f15d→4f2 emission are recorded upon excitation with high repetition rate X-ray synchrotron excitation and pulse cathode ray excitation. Issues related to a non-exponential decay of luminescence and presence of slow decay components are discussed in terms of energy transfer dynamics. The presence of defects was revealed with thermoluminescence measurements and these are suggested to be the mainly responsible for delayed recombination of charge carriers on the Pr3+ 4f15d states. Some peculiarities of host-to-impurity energy transfer are discussed.

中文翻译:

掺杂 Pr3+ 离子的 K3Lu(PO4)2 的相变、辐射和光致发光

摘要 使用各种实验技术研究了 K3Lu(PO4)2:Pr3+(1 和 5 mol.%)微晶粉末的发光特性,这是一种很有前途的闪烁应用光学材料。该材料显示了与高强度构型间 4f15d→4f2 跃迁(宽紫外发射带)和构型内 4f2→4f2 跃迁(可见光范围内的弱发射线)相关的发射特征。X 射线激发 Pr3+ 的 4f15d→4f2 发射的输出随着温度从 90 K 升高到室温而增加,并且取决于 Pr3+ 离子浓度。发现 Pr3+ 离子的 5% 高浓度有利于单斜相(P21/m 空间群)在三角相(P 3 空间群)上的稳定,而材料的发射特性表明发生了相变在较高温度下。Pr3+ 4f15d→4f2 发射的衰减动力学在高重复率X 射线同步加速器激发和脉冲阴极射线激发下记录。在能量转移动力学方面讨论了与发光的非指数衰减和慢衰减分量的存在相关的问题。热释光测量揭示了缺陷的存在,并且这些缺陷被认为是造成 Pr3+ 4f15d 状态的电荷载流子延迟复合的主要原因。讨论了宿主到杂质能量转移的一些特点。
更新日期:2021-02-01
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