Abstract
Site-selective and fluorescence line narrowing (FLN) laser spectroscopy was used to study the structure of Eu3+-doped Gd2O3-based material embedded in the mesopores of submicron-sized monodisperse spherical amorphous SiO2 particles that are of interest for biomedical applications. The phase composition of the material in the pores was determined and the transformations that occur under heat treatment were studied. The room-temperature homogeneous linewidth of 5D0 − 7F0 transition of Eu3+ ions in different Gd2O3/SiO2 phases was measured with FLN technique. The radiative lifetime of the 5D0 excited state of Eu3+ ions was measured with time-resolved fluorescence technique; the local field effects on radiative transitions in the composite material are discussed.
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