Abstract
Absorption and fluorescence spectra of commercially available polycrystalline ceramic Nd3+:Y2O3 and nanocrystalline aggregates of Nd3+:Y2O3 grown in our laboratory are optically characterized at nominal 8K and room temperature. In comparing the spectra obtained from these two different sources, we find similarities in terms of the detailed crystal-field splitting of the energy levels of the Nd3+ ion in the Y2O3 host. The 8K spectra are analyzed for the energy (Stark) level transitions between the LJ2S+1 multiplet manifolds of Nd3+(4f3). The analysis includes the manifolds of I9∕24 (the ground state), I11∕24, I13∕24, I15∕24, F3∕24, F5∕24, H9∕22, F7∕24, S3∕24, and F9∕24. The results of this study are also compared with a crystal-field splitting analysis reported earlier for single-crystal Nd3+:Y2O3 grown by a modified flame fusion method. We find that the spectroscopic properties of our composites compare favorably with other ceramic and single-crystal forms of Nd3+:Y2O3 currently available.
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