Anti-stokes luminescence of Y2O3:Er

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.