Abstract
Crystal-field (CF) levels below 36 000 cm−1 of Eu3+ atthe C2 site of Gd2O3 nanorods are experimentally determined from the excitation and emissionspectra at 10 K. The levels are analysed in terms of 20 freely varied free-ionand CF parameters, and energy-level fit yields a final standard deviation of12.9 cm−1, showing very good agreement between the observed and thecalculated values. The Judd–Ofelt (JO) intensity parametersΩ2,4,6 are determined to be 12.39, 2.02 and 0.19 (in10−20 cm2) which takes J-mixing into account. For the first time the absolute value of theΩ6 parameteris reliably determined. The calculated radiative transition rates and branching ratios for the transitionsfrom 5D0 agree well with the experiments. The size dependence of the JO intensity parameters ofEu3+ inRE2O3 (RE = Y, Gd, Lu) nanocrystals is clarified. The fluorescence lifetime of5D0 ofEu3+ inGd2O3 nanorods is observed to be significantly affected by the surrounding media, giving rise to afilling factor of 0.58 for the nanoparticles.
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