Pr^(3+),Yb^(3+)双掺的CaWO_4荧光粉的近红外量子剪裁  

Near Infrared Quantum Cutting in Pr^(3+),Yb^(3+) Co-doped CaWO_4 Phosphors

作　　者：李云青[1] 崔彩娥[1,2] 黄平[1] 王磊 田跃[1] 贾海珍[1] 

机构地区：[1]太原理工大学物理与光电工程学院,太原030024 [2]太原理工大学新型传感器与智能控制教育部与山西省重点实验室,太原030024

出　　处：《光子学报》2015年第7期152-156,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(No.510722011238);山西省自然科学基金(Nos.2014011017-03;2013021004-2)资助

摘　　要：采用高温固相法制备了近红外量子剪裁CaWO4∶Pr3+,Yb3+荧光粉,利用X射线衍射及荧光光谱手段研究了不同浓度Yb3+掺杂对样品的物相及发光性能的影响.X射线衍射结果表明所制备的样品均为纯相白钨矿结构的CaWO4.在453nm光激发下,可以观察到中心波长位于1 001nm,1 030nm和1 048nm的三个近红外发射峰,它们分别对应于Yb3+的2F5/2→2F7/2和Pr3+的1D2→3F4的跃迁.为了进一步研究Pr3+-Yb3+间能量传递,测量了不同Yb3+浓度下Pr3+的3P0能级(652nm)的寿命衰减曲线,观察到随着Yb3+浓度的增加,Pr3+离子的寿命逐渐缩短,表明Pr3+与Yb3+的能量传递效率和量子效率逐渐提高.经过计算,最高量子效率约为166.9%.该材料有助于提高硅太阳能电池的光电转换效率.Near-infrared quantum cutting CaWO4 ： Pr3＋ , Yb3＋ phosphors were prepared by the solid state reaction method. The effect of different concentrations of Yb3＋ ions on the phase and luminescent properties of the samples was investigated by X-ray diffractometer, fluorescence spectrophotometer and luminescence lifetime decay curve. X-ray diffraction shows that all of samples are pure scheelite-typed CaWO4. Three near-infrared emission peaks located at 1001, 1030 and 1048 nm can be found in the emission spectra upon the excitation of 453-nm light, which correspond to 2 F5/2→2 F7/2 transition of Yb3＋ and 1D2→3F4 transition of Pr3＋ , respectively. The luminescence lifetime decay curve of Pr3＋ （652 nm） with different Yb3＋ concentrations is gradually shortened with the increase of Yb3＋ ions concentration, which suggests energy transfer efficiency and quantum efficiency can be improved with the increase of Yb3＋ ions concentration. The highest quantum efficiency can be calculated to be 166.9%. The material may be applied in the silicon solar cells to improve its !ohotoelectric conversion efficiency

关 键 词：量子剪裁 近红外 高温固相法 CaWO4荧光粉 稀土离子 能量转移 量子效率 

分 类 号：O482.31[理学—固体物理]