BaF2:Ce^3+,Yb^3+米颗粒的近红外发光性质研究  

Research on Near Infrared Luminescent Properties of BaF2: Ce^3+, Yb^3+ Nanoparticles

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作  者:李素文[1] 姜义[1] 贯丛[1] 岳巾英[1] 岳明[1] 

机构地区:[1]长春工程学院理学院,吉林长春130012

出  处:《纳米科技》2015年第1期42-47,共6页

基  金:国家自然科学基金项目(11304021),国家重点实验室项目(RERU2013002),吉林省科技发展计划项目(201205040)

摘  要:采用水热合成的方法制备了BaF2:Ce^3+,Yb^3+纳米颗粒,利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE—SEM)、透射电子显微镜(TEM)、近红外漫反射光谱、光致发光光谱(PL)等测试分析技术对样品的结构、形貌、发光性质以及荧光动力学进行分析,结果表明,不同掺杂浓度的BaF2:Ce^3+,Yb^3+纳米粒子为结晶性良好的纯立方相结构,纳米颗粒均匀、单分散,平均粒径约50nto左右。BaF2:Ce^3+,Yb^3+纳米颗粒,激发Ce^3+的5d能级在900-1050nm波长范围具有较强的近红外发射,此发射波长与硅太阳能电池的硅带隙相匹配;随着Yb^3+离子浓度的增加Yb^3+的近红外发射强度呈现先增加而后降低的趋势,能量传递效率和发光内量子效率增加,而ce斗的发射强度降低且寿命减少。The BaF2: Ce^3 +, Yb^3 + nanoparticles with diameters of 50 nm were prepared by the hydrothermal method. Their structure and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and diffuse reflectance spectra. The nanoparticles present spheroidal, uniform and mono-dispersed. The photoluminescent excitation spectra, Ultraviolet-visible (UV-Vis) and near infrared (NIR) emission spectra and fluorescence dynamics were studied in detailed. The results indicate that the strong infrared emission at 900-1050 nm was obtained, which is matching to energy of Si band gap of Si-based solar cells. With increasing Yb^3+ concentration, the lifetime of Ce^3+ decreased and the energy transfer efficiency and luminescent inner quantum efficiency increase.

关 键 词:纳米 近红外发光 效率 太阳能电池 

分 类 号:TB34[一般工业技术—材料科学与工程]

 

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