Eu^(3+)掺杂钙钛矿结构的MSnO_3(M=Ca,Sr,Ba)发光粉的发光特性研究

A Study on the Luminescent Property of Eu^(3+)-doped MSnO_3(M=Ca,Sr,Ba) Perovskite

利用高温固相反应法合成了MSnO3∶Eu3+(M=Ca,Sr,Ba)发光粉末样品,采用X射线衍射技术和荧光光谱等测试手段对样品的结构、固相反应机理及发光特性进行了研究。结果表明:Eu3+离子的掺杂未明显改变MSnO3(M=Ca,Sr,Ba)的晶体结构。荧光光谱测试显示Ca0.98Eu0.02SnO3样品的发射以电偶极跃迁5D0-7F2的红光发射为主,荧光寿命测试结果表明Ca0.98Eu0.02SnO3样品中存在能量转移现象。Sr0.98Eu0.02SnO3样品的发射以5D0-7F1磁偶极跃迁为主。Ba0.98Eu0.02SnO3样品的发射也以磁偶极跃5D0-7F1为主,但是Ba0.98Eu0.02SnO3发光比Ca0.98Eu0.02SnO3弱很多。简言之,MSnO3∶Eu3+(M=Ca,Sr,Ba)的发光能力与其晶格对称性、键能键长,带隙宽度有关。

MSnO3：Eu3＋ （M = Ca, Sr, Ba） powder samples were prepared with high temperature solid-state reaction. Structures, solid-state reaction mechanism and luminescence properties were investigated respectively with testing, such as XRD, fluorescence spectra and so on. The results of X-ray diffraction testing indicate that Eu3＋ ions doping changes the crystal structure of MSnO3（M=Ca,Sr,Ba） slightly. The fluorescence spectra testing shows that emission of Ca0.98 Eu0.02SnO3 sample is mainly from red-light emitting dominated 5D0-TF2 electric dipole transition while the fluorescence lifetime testing results witnesse the energy transfer phenomenon. The emission of Sr0.98Eu0.02SnO3 sample is dominated with 5D0-TF1 magnetic dipole transition as well as Ba0.98Eu0.02SnO3 but with a much less luminescence intensity. The luminescence capacity of MSnO3 ：Eu3＋ （M = Ca, Sr,Ba） lattice relates to the lattice symmetry, bond-energy, bond-length and the width of the band gap. Key words： high temperature solid-state reaction method; MSnO3 ： Eu3＋ （M = Ca, Sr, Ba） ; luminescent property.