物理学报Issue(10)：1-9,9.DOI:10.7498/aps.64.107803
Eu3+掺杂CaMoO4微米荧光粉发光性质的研究∗
Luminescence properties of Eu3+ doped CaMoO4 micron phosphors
摘要
Abstract
Eu3+doped CaMoO4 micron phosphors of different concentrations were prepared by chemical precipitation method. The photoluminescence properties were studied in detail. The X-ray diffraction measurements indicate that the samples are scheelite structure, and doping Eu3+enlarge the lattice parameter of host material. The scanning electron microscope images show that the particle morphology is near-spherical and the size is 4–5 µm. The excitation and emission spectra of CaMoO4:Eu show that CaMoO4:Eu can be effectively excited by blue light and near UV-light, and the red light emission of high colour purity can be realized. The electron-phonon coupling properties were also studied. The results indicate that the magnitude of Huang-Rhys factor is 10−2, so the CaMoO4:Eu is a weak electron-phonon coupling material. The results also indicate that the Huang-Rhys factor increases with the increase of concentration. It is probably because that increasing the doping concentration enhances the lattice relaxation. The transition intensity parameter Ω2 of Eu3+ enlarges while the concentration is increasing. Because Ω2 and the luminescent center environment are closely related, the numerical value of Ω2 enlarges with the increase of degree of environmental disorder. But Ω4 doesn’t have obvious change. It can be explained that the environmental sensitivity level of Eu3+ 5D0 → 7F2 transition is higher than that of 5D0 → 7F4 transition. The quantum efficiency of Eu3+ 5D0 energy level decreases with the increase of doping concentration. This can be attributed that the enhancement of Eu3+ doping concentration enlarges the energy transfer rate between luminescent centers, so the energy of excited electrons can be transferred to quenching center more easily and then the nonradiative relaxation rate of excited electrons increases. The best doping concentration of Eu3+ is 25% by drawing the concentration quenching curve. Furthermore, the energy transfer type of Eu3+ in CaMoO4 host is confirmed to be exchange interaction and the critical distance is calculated to be 8.4 Å. The chromaticity coordinate of CaMoO4:Eu phosphors is (0.654, 0.334), so the samples have high colour purity. The study indicates that CaMoO4:Eu micron phosphor prepared by chemical precipitation method is a red phosphor material with excellent property.关键词
Eu3+/黄昆因子/量子效率/色坐标Key words
Eu3+/Huang-Rhys factor/quantum efficiency/color coordinate引用本文复制引用
赵聪,孟庆裕,孙文军..Eu3+掺杂CaMoO4微米荧光粉发光性质的研究∗[J].物理学报,2015,(10):1-9,9.基金项目
国家自然科学基金(批准号:51002041)、黑龙江省自然科学基金(批准号：F201202)和黑龙江省普通高等学校青年学术骨干支持计划(批准号:1252G032)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.51002041), the Natural Science Foundation of Heilongjiang Province of China (Grant No. F201202), and the Foundation for Young Key Scholars of Higher Education Institution of Heilongjiang Province, China (Grant No.1252G032) （批准号:51002041）
