Leonardo A. Rocha

Photoluminescence and structural analysis of Er3+/Yb3+/Tm3+ triply doped Gd2O3

Spectroscopic and structural properties of Er 3+ :Yb 3+ :Tm 3+ triply doped Gd 2 O 3 nanocrystals were investigated. Materiais were heat treated at 800, 900, 1000 and 1100 oC for 4h, and heat treatment effect in the luminescence was discussed. The doping process with RE 3+ was effective on Gd 2 O 3 cubic phase, and structural parameters were determined for this phase. The morphology of the particles did not showed difference on shape and size, demonstrating the reproducibility of the synthesis methods. The luminescence at visible and infrared regions was studied when samples are excited at 980 nm. Materials present intense visible up-conversion and infrared emissions at 1550 nm, and Er 3+ emissions are favored in the materials, concluding that in Er 3+ :Yb 3+ :Tm 3+ triply doped materials the transfer between Yb 3+ and Er 3+ occurs preferentially. Materials due absorption at UV and IR regions can be availed in solar concentrators, as well as 1550nm for optical telecom applications in the C-band.