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Optical thermometry using Stark sublevels in charge compensated transition metal molybdate upconverting phosphors
Optics & Laser Technology ( IF 4.6 ) Pub Date : 2020-05-29 , DOI: 10.1016/j.optlastec.2020.106341
Manisha Mondal , Vineet Kumar Rai

A series of anorthic phased Er3+/Yb3+/Li+/K+: ZnMoO4 phosphors have been synthesized by solid state reaction method. Under 980 nm excitation, Er3+-Yb3+codoped phosphors exhibit intense green emission at ~531 nm/~553 nm corresponding to the 2H11/2/4S3/2 → 4I15/2 and weak blue and red emissions at ~408 nm, ~474 nm and ~656 nm corresponding to the 2H9/2 → 4I15/2, 4F7/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions, respectively. The multipolar interaction is found responsible for the concentration quenching. Furthermore, with incorporating the charge compensating agents Li+/K+ the UC emission intensity as well as temperature sensing performance have been perceptibly improved compared to the Er3+-Yb3+ phosphors. The fluorescence intensity ratio (FIR) technique have been performed to the thermally coupled (2H11/2, 4S3/2) levels and Stark sublevels (2H11/2, 4S3/2(I) & 2H11/2, 4S3/2(II)) to confirm the temperature sensing ability of the phosphors. The maximum sensitivity corresponding to the 2H11/2, 4S3/2(I) → 4I15/2 & 2H11/2, 4S3/2(II) → 4I15/2 transitions from the Stark sublevels have been observed.



中文翻译:

使用Stark子级在电荷补偿的过渡金属钼酸盐上转换荧光粉中进行光学测温

通过固相反应法合成了一系列的原相定相的Er 3+ / Yb 3+ / Li + / K +:ZnMoO 4荧光粉。在980 nm激发下,Er 3+ -Yb 3+共掺杂的磷光体在〜531 nm /〜553 nm处显示出强绿色发射,对应于2 H 11/2 / 4 S 3 / 2  →  4 I 15/2和弱蓝和红色排放在〜408纳米,474〜nm和656〜纳米对应于2 ħ 9/2  →  415/24 ˚F7/2  →  415/24 ˚F 9/2  →  4个15/2跃迁,分别。发现多极相互作用导致浓度猝灭。此外,与 Er 3+ -Yb 3+ 荧光粉相比,通过加入电荷补偿剂Li + / K +,UC发射强度以及温度感应性能得到了明显改善。荧光强度比(FIR)技术已用于热耦合(2 H 11 / 2,4 S 3/2)和Stark子水平(2 H 11 / 2,4 S 3/2(I)2 H 11 / 2,4 S 3/2(II))以确认荧光粉的温度感应能力。最大灵敏度对应于2 H 11 / 2,4 S 3/2(I)  →  4 I 15/22 H 11 / 2,4 S 3/2(II) →  4 I 15/2跃迁已经观察到鲜明的子级别。

更新日期:2020-05-29
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