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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Structural and luminescence properties of Nd3+/Yb3+ codoped Al4B2O9 nanocrystalline powders
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Structural and luminescence properties of Nd3+/Yb3+ codoped Al4B2O9 nanocrystalline powders

机译：Nd3 + / Yb3 +共掺杂Al4B2O9纳米晶体粉末的结构和发光性能

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Morphological, structural and optical properties of Nd3+/Yb3+ codoped Al4B2O9 nanopowders prepared by the polymeric precursor method were investigated. The compounds previously heat-treated at 900 degrees C were characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) techniques. The Al4B2O9 nanocrystals obtained possess an orthorhombic structure with grain dimensions between 10 and 20 nm. Photoluminescence (PL) spectra under excitation at 804 nm were collected and analyzed. The results indicate that the energy absorbed by Nd3+ (transition: I-4(9/2) -> F-4(5/2) + H-2(9/2)) is efficiently transferred to Yb3+ in samples having 2 mol% of Nd3+ and 1 mol% of Yb3+, increasing the emission from 930 nm to 1130 nm by 12.2 times in comparison with the samples doped with 1 mol% of Nd3+ and 1 mol% of Yb3+. The dynamics of the PL process was also investigated. The PL decay at 975 nm from Yb3+ (F-2(5/2) -> F-2(7/2)) and at 1080 nm from Nd3+ (F-4(3/2) -> I-4(11/2)) was studied. The Yb3+ F-2(5/2) level lifetime varies from 201 to 48 mu s while the lifetime of the Nd3+ F-4(3/2) level varies from 121 to 69 ms when the Nd3+ concentration is changed from 1 to 8 mol%. On the other hand, the Yb3+ F-2(5/2) lifetime varies from 176 to 15 mu s and the Nd3+ F-4(3/2) lifetime varies from 97 to 44 mu s when the Yb3+ concentration is changed from 1 to 8 mol%, due to interactions between the rare-earth ions. The present results show that Nd3+/Yb3+ codoped Al4B2O9 nanocrystalline powders have large potential to be tested in solar energy concentrators and IR laser devices.
机译：研究了通过聚合物前驱体方法制备的Nd3 + / Yb3 +共掺杂Al4B2O9纳米粉体的形貌，结构和光学性质。通过X射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）技术对先前在900摄氏度下进行了热处理的化合物进行了表征。所获得的Al4B2O9纳米晶体具有正交晶结构，晶粒尺寸在10至20 nm之间。收集并分析在804 nm激发下的光致发光（PL）光谱。结果表明，在2 mol的样品中，Nd3 +吸收的能量（转变：I-4（9/2）-> F-4（5/2）+ H-2（9/2））被有效转移到Yb3 +上。 Nd3 +和Yb3 +的摩尔百分比为1％，与掺杂1％（摩尔）的Nd3 +和Yb3 +的摩尔百分比为1的样品相比，发射量从930 nm增大到1130 nm。 PL过程的动力学也进行了研究。从Yb3 +（F-2（5/2）-> F-2（7/2））在975 nm处以及从Nd3 +（F-4（3/2）-> I-4（11）在1080 nm处的PL衰减/ 2））。当Nd3 +的浓度从1变为8时，Yb3 + F-2（5/2）的寿命从201改变为48毫秒，而Nd3 + F-4（3/2）的寿命从121改变为69毫秒。摩尔％。另一方面，当Yb3 +的浓度从1变为1时，Yb3 + F-2（5/2）的寿命从176改变到15μs，Nd3 + F-4（3/2）的寿命从97改变到44 s。由于稀土离子之间的相互作用，其含量为8mol％。目前的结果表明，Nd3 + / Yb3 +共掺杂的Al4B2O9纳米晶体粉末具有很大的潜力，可以在太阳能集中器和红外激光设备中进行测试。

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