Abstract
Diffuse reflectance and spontaneous photoluminescence excitation spectra of the Y2O3:Er (10 at % Er) compound have been studied under varied optical pumping conditions. The results demonstrate that the anti-Stokes luminescence of erbium-doped yttrium oxide has high intensity when two different photon energies are used for infrared illumination. The resonance wavelengths of IR photons for two-photon excitation of visible emission in the Y2O3:Er phosphor have been determined, and the corresponding electron transitions in erbium-related emission centers have been identified for the Stokes and anti-Stokes luminescence.
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