Synthesis and characterization of Ca2Sn1-xCexO4 with blue luminescence originating from Ce^4＋ charge transfer transition

Ce^4＋-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 Ce^4＋ ions doped in Ca2SnO4 occupy the Sn^4＋ 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 Ce^4＋ charge transfer （CT）. The luminescent properties of Ca2Snl_xCexO4 have been compared with those of Sr2CeO4, which is the only material reported so far to show Ce^4＋ 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%.

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

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{\%}.