Abstract
In this work, we have examined modifications of structural and optical properties of Y3Al5O15:Ce3+ (Ce3+:YAG) material when transforming from nanograins to nanoceramic form under high pressure. Initial YAG material with 0.5% of Ce3+ was prepared using modified Pechini and transformed to nanoceramic at low temperature with a working pressure of 4 GPa. Structural properties of both samples (nanopowder and nanoceramic) have been examined with X‐ray diffraction and scanning electron microscope. Optical properties have been examined using photoluminescence (PL) spectroscopy, PL‐excitation spectroscopy at different temperatures, and time‐resolved spectroscopy. Based on results obtained, excitation mechanism of Ce3+ ions has been explained. The main 560 nm emission band along with a new 400 nm emission band allowed to cover the whole visible spectral range. Moreover, it has been found that under high‐pressure treatment the amorphous shell of YAG core appears, leading to increased 5d electrons–lattice interaction. This, in turn, reduces PL decay time and increases emission intensity of nanoceramic sample.
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