Abstract
Lu2O3 nanospheres with various concentrations of Eu3+ are synthesized via urea homogeneous precipitation method. The influence of the Eu3+ doping concentration on the structural, optical properties was systemically studied. The emission spectra of Lu2O3: Eu3+ nanospheres consist of a group of sharp lines from blue to red light originating from 5D1, 0→7FJ transitions of Eu3+. The photoluminescence intensities and decay times varies with the increasing Eu3+ concentrations, which are attributed to the energy transfer among the Eu3+ ions. The fluorescent quenching is mainly due to the D–D interaction by using the Van Uitert’s model and Dexter’s model. The Lu2O3: Eu3+ phosphor exhibits good thermal characteristics. The emission intensity of Lu2O3: Eu3+ phosphor only decreases 8% with the increasing of temperature from 303 to 403 K. The temperature quenching behavior of Lu2O3: Eu3+ is attributed to the crossover process via the charge transfer band with high activation energy of 0.264 eV. Moreover, the Judd–Ofelt parameters $$\Omega_{\lambda}$$ (λ = 2, 4, 6) of Eu3+ in Lu2O3 phosphor were also calculated.
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