Expanding broadband emission in the near-IR via energy transfer between Er3+-Tm3+ co-doped tellurite-glasses

Processes of energy transfer in Er3+-Tm3+ co-doped tellurite glasses has permitted to obtain an expanding broadband emission in the near-infrared region covering the bands S, C+L and U of the optical telecommunications and extending up to the 1700-1900 nm range under excitation by a 976 nm laser diode. This widening of the emission band is achieved through an integrated emission, where the Er3+ ions act as donor and the Tm3+ ions as acceptor following the route (Er3+)I-4(11/2)->(Tm3+)H-3(5), (Er3+)I-4(13/2)->(Tm3+)H-3(4) and (Er3+)I-4(13/2)->(Tm3+)F-3(4). The relative intensity emission and lifetime of the I-4(13/2)-> I-4(15/2) transition of the Er3+ ions decrease with increasing the Tm3+ concentration. Besides, high Tm3+ concentrations produce an emission quenching for the H-3(4)-> F-3(4) and F-3(4)-> H-3(6) radiative transitions, due to cross-relaxation between Tm3+ ions. These effects are studied by means of probability and quantum yield of the energy transfer. The most intense and widest emission band is measured in the glass co-doped with 0.075 and 1 mol% of Tm2O3 and Er2O3, respectively. (C) 2013 Elsevier B.V. All rights reserved.