Broadband emission in Er–Tm codoped Al2O3 films: The role of energy transfer from Er to Tm
نویسندگان
چکیده
Er–Tm codoped a-Al2O3 thin films prepared by alternate pulsed laser deposition show a broad photoluminescence band with two characteristic peaks at 1540 and at 1640 nm, respectively, related to Er3+ and Tm3+ emissions. Two series of films have been prepared. For the first series, the Tm concentration Tm has been increased while keeping constant the Er concentration Er . The results show that the photoluminescence intensity at 1640 nm I1640 to that at 1540 nm I1540 decreases and that at 1640 nm I1640 increases, i.e., the I1640/ I1540 ratio increases as Tm is increased. For Tm / Er =3, a fairly flat emission spectrum I1640/ I1540 1 with a full width at half maximum of 230 nm is achieved. For the second series both Tm and Er are increased while keeping the Tm / Er ratio constant. The I1640/ I1540 ratio tends to be constant with a full width at half maximum of 150 nm. The lifetime values decrease in all cases as Tm increases. The evolution of the I1640/ I1540 and lifetimes as a function of Tm as well as the analysis of the latter considering Er as a donor and Tm as an acceptor evidence that there is an efficient energy transfer from Er3+ to Tm3+. These results suggest that enhanced performance with a flat broadband emission useful for planar integrated devices is achievable by further dopant engineering in the nanoscale. © 2007 American Institute of Physics. DOI: 10.1063/1.2433748
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