Optical spectroscopy of Ce3+-activated X-2-Y2SiO5

Emission and excitation spectra of X-2-Y2SiO5 doped with Ce3+ ions have bee n investigated at room temperature, in which Ce3+ ions were added by using different starting materials of CeO2(IV) or Ce(NO3)(3). 6H(2)O (III), The e mission spectra were analyzed on the base of a Gaussian function to investi gate the detailed optical characteristics of Ce3+. Y2SiO5 doped with CeO2 e xhibited a broad spectrum with a tail in the range from 500 to 600 nm, On t he other hand, Y2SiO5 doped with Ce (NO3)(3) gave a relatively sharp spectr um shorter than 500 nm, With using fitting parameters based on Gaussian fun ction, Y2SiO5 doped with CeO2 was found to show an additional Gaussian band around 430 nm in contrast to the Ce(NO3)(3) doped one, Furthermore, the fl uorescence spectra under the excitation at 330 nm indicated that a broad sp ectrum with a peak at 480 nm is only observed in Y2SiO5 doped with CeO2. Su ch an emission spectrum is similar to the new Gaussian band at 430 nm estim ated from the parameter fitting. This implies that the new band actually ex ists, contributing to the tail of the emission spectra, These results give a new information on the occupation site of Ce3+ in the X-2-Y2SiO5 matrix.