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Synthesis and photoluminescence characteristics of a novel Eu and Tb doped Li2MoO4 phosphor
Applied Radiation and Isotopes ( IF 1.6 ) Pub Date : 2021-06-09 , DOI: 10.1016/j.apradiso.2021.109820
G Souadi 1 , U H Kaynar 2 , M Ayvacikli 3 , M B Coban 4 , M Oglakci 5 , A Canimoglu 6 , N Can 7
Affiliation  

Li2MoO4:x Eu3+ and Li2MoO4:xTb3+ phosphors, where x = 0.5, 1, 2, 3, 5 and 7 wt%, were synthesized through a gel-combustion method. The XRD data reveals that Eu3+ and Tb3+ doped Li2MoO4 phosphors exhibit a Rhombohedral structure belonging to the space group R3 which matched well with the standard JCPDS files (No.012-0763). We present photoluminescence (PL) spectra from Eu and Tb doped Li2MoO4 under 349 nm Nd:YLF pulses laser excitation over the temperature range of 10–300 K. Undoped Li2MoO4 shows a wide broad band around 600 nm because of the intrinsic PL emission of tetrahedral of MoO42 which was in good agreement with previous findings. Under the excitation of 394 nm, the as-synthesized phosphors exhibited sharp and strong intensity PL emission signals in the red (612 nm, 5D07F2 transition) and green (544 nm, 5D47F5 transition), respectively. The critical doping concentration of Eu3+ and Tb3+ ions in the Li2MoO4 were estimated to be 2 wt%. The concentration quenching phenomena were discussed, and the critical distances for energy transfer have also been evaluated by the concentration quenching.



中文翻译:

新型Eu和Tb掺杂Li 2 MoO 4荧光粉的合成及光致发光特性

Li 2 MoO 4 :x Eu 3+和Li 2 MoO 4 :xTb 3+磷光体,其中x=0.5、1、2、3、5和7wt%,通过凝胶燃烧法合成。XRD 数据显示,Eu 3+和Tb 3+掺杂的Li 2 MoO 4磷光体表现出属于空间群R3的菱面体结构,其与标准JCPDS文件(No.012-0763)匹配良好。我们展示了 Eu 和 Tb 掺杂的 Li 2 MoO 4在 349 nm Nd:YLF 脉冲激光激发下在 10–300 K 温度范围内的光致发光 (PL) 光谱。未掺杂的 Li 2 MoO 4 由于四面体的本征 PL 发射,在 600 nm 附近显示出宽的宽带 42-这与之前的研究结果非常吻合。在 394 nm 的激发下,合成的荧光粉在红色(612 nm,5 D 07 F 2跃迁)和绿色(544 nm,5 D 47 F 5跃迁)中表现出尖锐而强烈的 PL 发射信号), 分别。Li 2 MoO 4中Eu 3+和Tb 3+离子的临界掺杂浓度估计为2wt%。讨论了浓度猝灭现象,并通过浓度猝灭评估了能量转移的临界距离。

更新日期:2021-06-11
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