Intensity analysis and energy-level modeling of Nd$^{3+}$ in Nd$^{3+}$:Y$_{2}$O$_{3}$ nanocrystals in polymeric hosts
Bulletin of the American Physical Society(2009)
摘要
Optical absorption and emission intensities are investigated for Nd3+ in nanocrystalline NdY2O3. Room temperature absorption intensities of Nd3+ 4f3 transitions in synthesized NdY2O3 nanocrystals have been analyzed using the Judd–Ofelt J-O approach to obtain the phenomenological intensity parameters. The J-O intensity parameters are used to calculate the spontaneous emission probabilities, radiative lifetimes, and branching ratios of the Nd3+ transitions from the upper multiplet manifolds to the corresponding lower-lying multiplet manifolds LJ of Nd3+ 4f3 . The emission cross sections and room temperature fluorescence lifetimes of the important intermanifold F3/2→ IJ J=9 /2,11 /2,13 /2,15 /2 transitions have been determined. We also compare the spectra of the Nd:Y2O3 nanocrystals to those of the nanocrystals embedded in polymeric matrices of epoxy and chitosan, and we find similarities in terms of the detailed Stark energy levels of the Nd3+ ion in the Y2O3 nanocrystalline host. The 300 K spectra are analyzed for the energy Stark level transitions between the LJ multiplet manifolds of Nd3+ 4f3 . 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 nanocrystals embedded in polymeric hosts compare favorably with other ceramic and single-crystal forms of Nd:Y2O3 currently available. © 2009 American Institute of Physics. DOI: 10.1063/1.3074313
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