title: Synthesis and Luminescent Properties of CaSnO3:Eu Nanopowder Prepared by a Sol-Gel Route.
abstract: Luminescent properties of nanocrystalline CaSnO3:1%Eu have been investigated in order to develop novel red phosphors. The results indicate that high-quality nanoparticles with controlled stoichiometry and microstructure were prepared by a sol-gel method using citric acid and EDTA as complexes. There are two broad excitation bands located at 240 and 270 nm existing in the excitation spectrum in addition to the characteristic excitation peaks of Eu3+. Further investigations show that the excitation band located at 240 nm can be assigned to the host absorption while the Eu-O charge transfer is responsible for the 270 nm excitation band. These results indicate that the host can efficiently transfer energy to the Eu3+ ions. The more important is that since the symmetry of Eu3+ ions is lower, the pure red emission (5D9 --> 7F2 transition located at 618 nm) is predominant over all the emission. This means CaSnO3:Eu is a potential candidate for red luminescent materials.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Fu
authors.forename: Tuyuan
authors.initials: T
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yibin
authors.initials: Y
authors.lastname: Chen
authors.forename: Hongwu
authors.initials: H
authors.lastname: Zhang