荧光粉
离子
化学
激发态
分析化学(期刊)
激发
红外线的
兴奋剂
光子上转换
硅
原子物理学
光电子学
光学
材料科学
物理
有机化学
量子力学
色谱法
作者
Guotao Xiang,Yan Ma,Xianju Zhou,Sha Jiang,Li Li,Xiaobing Luo,Zhendong Hao,Xia Zhang,Guohui Pan,Yongshi Luo,Jiahua Zhang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2017-01-18
卷期号:56 (3): 1498-1503
被引量:27
标识
DOI:10.1021/acs.inorgchem.6b02600
摘要
A high-temperature solid-state method was used to synthesize the Ho3+- and Yb3+-codoped cubic Lu2O3 powders. The crystal structures of the as-prepared powders were characterized by X-ray diffraction. The energy-transfer (ET) phenomenon between Ho3+ ions and Yb3+ ions was verified by the steady-state spectra including visible and near-infrared (NIR) regions. Beyond that, the decay curves were also measured to certify the existence of the ET process. The downconversion phenomena appeared when the samples were excited by 446 nm wavelength corresponding to the transition of Ho3+: 5I8→5G6/5F1. On the basis of the analysis of the relationship between the initial transfer rate of Ho3+: 5F3 level and the Yb3+ doping concentration, it indicates that the ET from 5F3 state of Ho3+ ions to 2F5/2 state of Yb3+ ions is mainly through a two-step ET process, not the long-accepted cooperative ET process. In addition, a 62% ET efficiency can be achieved in Lu2O3: 1% Ho3+/30% Yb3+. Unlike the common situations in which the NIR photons are all emitted by the acceptors Yb3+, the sensitizers Ho3+ also make contributions to the NIR emission upon 446 nm wavelength excitation. Meanwhile, the 5I5→5I8 transition and 5F4/5S2→5I6 transition of Ho3+ as well as the 2F5/2→2F7/2 transition of Yb3+ match well with the optimal spectral response of crystalline silicon solar cells. The current research indicates that Lu2O3: Ho3+/Yb3+ is a promising material to improve conversion efficiency of crystalline silicon solar cell.
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