Optical transitions of Er3 + in lead-tellurium-germanate glasses

Abstract Optical-absorption, photoluminescence, and up-conversion luminescence were measured for Er 3 + in lead—tellurium— germanate glasses (63− x )GeO 2 · x TeO 2 · 27PbO · 10CaO with x = 0, 10, 20, 30, and 40. Each glass sample contains an extra 0.2 mol% Er 2 O 3 . Judd—Ofelt intensity parameters were determined and used to calculate the radiative transition rates and lifetimes of Er 3 + in glasses with different TeO 2 content. It has been found that the 4 S 3/2 → 4 I 15/2 radiative transition rate and the infrared (800 nm) to green (547 nm) up-conversion efficiency of Er 3 + increase with increasing TeO 2 content. Our results indicate that incorporating TeO 2 up to 40 mol% into a lead—germanate glass network increases the luminescence efficiency due to the increased refractive index and decreased maximum phonon energy of the host glass.

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