Abstract Ce4+-doped Ca2SnO$_{4}$ 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 Ca$_{2}$SnO$_{4}$ occupy the Sn4+ sites. The excitation and emission spectra of Ca$_{2}$Sn$_{1-x}$Ce$_{x}$O$_{4}$ appear to have broad bands with peaks at $\sim$ 268 nm and $\sim$ 442 nm, respectively. A long excited-state lifetime ($\sim$ 83 $\mu$s) for the emission from Ca$_{2}$Sn$_{1-x}$Ce$_{x}$O$_{4}$ suggests that the luminescence originates from a ligand-to-metal Ce4+ charge transfer (CT). The luminescent properties of Ca$_{2}$Sn$_{1 - x}$Ce$_{x}$O$_{4}$ have been compared with those of Sr$_{2}$CeO$_{4}$, which is the only material reported so far to show Ce$^{4 + }$ CT luminescence. More interestingly, it is observed that the emission intensity of Ca$_{2}$Sn$_{1 - x}$Ce$_{x}$O$_{4}$ with a small doping concentration (x $\sim$ 0.03) is comparable to that of Sr$_{2}$CeO$_{4}$ in which the concentration of active centre is 100%.
Received: 29 December 2006
Revised: 27 March 2007
Accepted manuscript online:
PACS:
81.20.Ev
(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
(Amorphous materials; glasses and other disordered solids)
Fund: Project supported by the
Foundation of Shantou University (Grant No 934064) and the
Science and Technology Program of Shantou City, Guangdong
Province, China (Grant No 152011).
Cite this article:
Fu Shi-Liu(符史流), Yin Tao(尹涛), and Chai Fei(柴飞) Synthesis and characterization of Ca2Sn1-xCexO4 with blue luminescence originating from Ce4+ charge transfer transition 2007 Chinese Physics 16 3129
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