Synthesis and characterization of Ca2Sn1-xCexO4 with blue luminescence originating from Ce4+ charge transfer transition

• 来源期刊: 中国物理（英文版）
• 关键词: Ca2Sn1-xCexO4 Ce4+-O2- charge transfer luminescent property
• 年，卷（期）: 2007,（10）
• 页码范围: 3129-3133
• 页数: 5页
• 语种: 英文

摘要

Ce4+-doped Ca2SnO4 with a one-dimensional structure, which emits bright blue light, is prepared by using a solid-state reaction method. The x-ray diffraction results show that the Ce4+ ions doped in Ca2SnO4 occupy the Sn4+ sites. The excitation and emission spectra of Ca2Sn1-xCexO4 appear to have broad bands with peaks at ～ 268nm and ～442nm, respectively. A long excited-state lifetime (～ 83μs) for the emission from Ca2Sn1-xCexO4 suggests that the luminescence originates from a ligand-to-metal Ce4+ charge transfer (CT). The luminescent properties of Ca2Sn1-xCexO4 have been compared with those of Sr2CeO4, which is the only material reported so far to show Ce4+ CT luminescence. More interestingly, it is observed that the emission intensity of Ca2Sn1-xCexO4 with a small doping concentration (x ～ 0.03) is comparable to that of Sr2CeO4 in which the concentration of active centre is 100%.