发光学报2017，Vol.38Issue(4)：423-429,7.DOI:10.3788/fgxb20173804.0423
Sr3Al2O6∶Tb3+,Yb3+荧光粉的近红外量子剪裁效应
Near-infrared Quantum Cutting of Sr3Al2O6∶Tb3+,Yb3+ Phosphors
摘要
Abstract
The mismatch between band gap of silicon cell and solar spectra results in serious loss of energy, which greatly reduces the efficiency of silicon solar cell.In order to decrease the loss of incident photons like ultraviolet (UV) photons, the photoluminescence materials with near-infrared (NIR) quantum cutting (QC) effect can be used as spectra transformation materials to enhance the efficiency of silicon solar cells.As a novel kind of efficient NIR quantum cutting material, Sr3Al2O6∶Tb3+,Yb3+ phosphors promising for silicon solar cells were successfully prepared using sol-gel method.The luminescence properties of Sr3Al2O6∶Tb3+,Yb3+ were investigated using photoluminescence (PL) spectra and decay lifetime curves.The results show that the phosphors can emit visible light of Tb3+:5D4→7Fj under the excitation of 320 nm, while NIR light is emitted by Yb3+:7F5/2→7F7/2 through cooperative energy transfer from one Tb3+ ion to two Yb3+ ions.Decay lifetimes of Tb3+ and quantum efficiency (QE) were studied for Sr3Al2O6:Tb3+ and Sr3Al2O6∶Tb3+,Yb3+.The results show that there is effective cooperative energy transfer from Tb3+ to Yb3+, in which maximum energy transfer efficiency (ETE) and the corresponding quantum efficiency are estimated to be 35.9% and 135.9%, respectively.The results demonstrate that Sr3Al2O6∶Tb3+,Yb3+ phosphors are promising candidate for improving the efficiency of silicon based solar cell by means of down-conversion.关键词
Sr3Al2O6/Tb3+/Yb3+/量子剪裁/合作能量传递Key words
Sr3Al2O6/Tb3+/Yb3+/quantum cutting/cooperative energy transfer分类
信息技术与安全科学引用本文复制引用
刘艳花,拜文霞,耿中荣,冯利邦..Sr3Al2O6∶Tb3+,Yb3+荧光粉的近红外量子剪裁效应[J].发光学报,2017,38(4):423-429,7.基金项目
兰州交通大学青年科学基金(2012015)资助项目Supported by Youth Science Foundation of Lanzhou Jiaotong University(2012015) （2012015）
