Abstract
Blue emission at 486 nm corresponding to the transition in (GGG) thin epitaxial film was generated after excitation with infra-red radiation at around 890 nm. The upconversion mechanism was shown to be excited-state absorption from the multiplet. The spectroscopic properties of the state of in GGG were also studied. The emission spectra of bulk crystals and thin film are centred at , and the measured lifetime is about at room temperature. Blue-wavelength upconversion excitation spectra and direct infra-red excitation spectra allowed us to determine the Stark energy levels in the and multiplets.
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