Eu~(3+)和Yb~(3+)掺杂的近红外发光材料的制备及荧光性能

采用溶胶-凝胶法制备了系列近红外发光材料Y_(1.98-x)Yb_xEu_(0.02)O_3(其中x=0,0.01,0.02,0.04,0.06,0.10),并采用X射线衍射仪(XRD)、荧光光谱(PL)等测试方法、技术对样品的物相结构和发光特性进行了表征及测试.结果表明:Eu~(3+)和Yb~(3+)掺杂的荧光粉中,Eu~(3+)和Yb~(3+)部分取代了Y~(3+),并占据其晶格位置,而对Y_2O_3的立方相晶体结构未产生显著影响;在466 nm波长(Eu~(3+)的特征激发峰)激发下,在可见光区及近红外光区可观察到较强的发射光谱,其中,Y_(1.94)Yb_(0.04)~(3+)Eu_(0.02)~(3+)O_3在近红外光区发光效率最高.采用溶胶-凝胶法制备出Eu~(3+)和Yb~(3+)掺杂的新型荧光材料,可将硅太阳能电池吸收较弱的高能光子转换成吸收较好的近红外光子,可有效解决太阳光谱与硅太阳能电池光电响应之间存在的光谱失配问题.

Preparation and Spectroscopic Characterization of Eu~(3+) and Yb~(3+) Near Infrared Luminescent Material

The near Infrared luminescent materials of Y_(1.98-x)Yb_xEu_(0.02)O_3( where x= 0,0.01,0.02,0.04,0.06,0.10)were prepared through a facile,in-expensive pathway of sol-gel method,and the resultant samples were characterized and analyzed using X-ray diffraction( XRD) and fluorescence spectroscopy( PL). The results of X-ray diffraction indicated that the incorporation of ions of Eu~(3+)and Yb~(3+)only partially replaced the lattice sites of Y~(3+)without the change of the former cubic crystal structure of Y_2O_3. Under the chosen laser( 466 nm,the characteristic excitation wavelength of Eu~(3+)) irradiation,the emission light of visible light emission and near-infrared from the resultant samples could be observed,where the samples of Y_(1.94)Yb_(0.04)~(3+)Eu_(0.02)~(3+)O_3 showed the higher luminous efficiency in the near infrared spectrum.The ions of Eu~(3+)and Yb~(3+)doped near infrared luminescent material were successfully prepared using sol-gel method,and the structure and luminous performance were systematically characterized. The resultant sample could efficiently convert high energy photons into NIR photon benefiting the improvement of the photoelectric conversion efficiency of the Si-solar cell. Thus,the problem of spectrum mismatch between solar spectrum and photoelectric response of silicon solar cells could be solved,and the novel near infrared luminous materials owned the promising prospect and broad application in the design and fabrication of novel high efficiency silicon solar cells.