Synthesis and luminescence properties of a novel red-emitting phosphor SrCaSiO_4:Eu^(3+) for ultraviolet white light-emitting diodes  

作　　者：于泓 高桂梅 孔丽 李广环 甘树才 洪广言 

机构地区：[1]College of Chemistry,Jilin University [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences

出　　处：《Journal of Rare Earths》2011年第5期431-435,共5页稀土学报（英文版）

基　　金：Project supported by the High Technology Research and Development Program Foundation of China (2007AA06Z202);Natural Science Foun-dation of Jilin Province (20070405);National Science and Technology Major Projects (2008ZX05018);the Nation Innovative Projects with Cooperation in Terms of Production,Study and Research (The exploration and utilization of oil shale)

摘　　要：A novel red phosphor based on Eu3＋-activated SrCaSiO4 was successfully synthesized by conventional solid state reaction method and the photoluminescence properties were investigated. X-ray diffraction （XRD） patterns indicated that SrCaSiO4：Eu3＋ phosphors belong to orthorhombic crystal system （space group=Pmnb）. The photoluminescence （PL） excitation spectrum showed broad-band absorption and the strongest excitation peak at 397 nm contributed to the 7F0→5L6 transition which matched well with the emission of a UV chip. The PL emission spectrum with the peaks at 577,586,592,612,650 and 685 nm,were probably attributed to the transitions from 5D0 to 7FJ （J=0,1,2,3,4） of Eu3＋ ions. The quenching concentration of Eu3＋ was 10 mol.%,and the critical distance （Rc） was about 1.2 nm. The fluorescence lifetime of Eu3＋ ions was found to be 3.2 ms. The results indicated that the SrCaSiO4：Eu3＋ might become an important red phosphor candidate for white-light-emitting diodes with near-UV LED chips.A novel red phosphor based on Eu3＋-activated SrCaSiO4 was successfully synthesized by conventional solid state reaction method and the photoluminescence properties were investigated. X-ray diffraction （XRD） patterns indicated that SrCaSiO4：Eu3＋ phosphors belong to orthorhombic crystal system （space group=Pmnb）. The photoluminescence （PL） excitation spectrum showed broad-band absorption and the strongest excitation peak at 397 nm contributed to the 7F0→5L6 transition which matched well with the emission of a UV chip. The PL emission spectrum with the peaks at 577,586,592,612,650 and 685 nm,were probably attributed to the transitions from 5D0 to 7FJ （J=0,1,2,3,4） of Eu3＋ ions. The quenching concentration of Eu3＋ was 10 mol.%,and the critical distance （Rc） was about 1.2 nm. The fluorescence lifetime of Eu3＋ ions was found to be 3.2 ms. The results indicated that the SrCaSiO4：Eu3＋ might become an important red phosphor candidate for white-light-emitting diodes with near-UV LED chips.

关 键 词：PHOSPHOR SrCaSiO4：Eu3＋ PHOTOLUMINESCENCE transition rare earths 

分 类 号：TN104.3[电子电信—物理电子学]