Energy Transfer Studies in Tb-Yb Co-Doped Phosphate Glasses.

Detailed optical properties of Tb-Yb co-doped phosphate glasses were performed based on their emission spectra and decay measurements. Under blue excitation of Tb at 488 nm, the intensity of Yb emissions gradually enhanced upon increasing the Yb content until 1 mol% indicated an energy transfer from Tb to Yb. Otherwise, under near infrared excitation of Yb at 980 nm, these glasses exhibit intense green luminescence, which led to cooperative sensitization of the D level of Tb ions.