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Observation of 1.5 μm photoluminescence and electroluminescence from a holmium organic complex

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7 Author(s)
Zang, F.X. ; The Key Laboratory of the Excited State Processes, Chinese Academy of Sciences, 16-Dong NanHu Road, Economic Development Area, Changchun, 130033, People’s Republic of China and Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, People’s Republic of China ; Li, W.L. ; Hong, Z.R. ; Wei, H.Z.
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Electroluminescence (EL) and photoluminescence in both the visible and near-infrared spectral range were observed from a holmium(dibenzoylmethanato)3(bathophenanthroline) [Ho(DBM)3bath]. Five peaks at 580 nm, 660 nm, 980 nm, 1200 nm, and 1500 nm, respectively, were attributed to the internal 4f electronical transitions of the Ho3+ ions. Except for the emissions of the Ho3+ ions, a broadband exciplex emission from 480 nm to 670 nm appeared in the EL cases. The emission intensity of the exciplex at organic interface showed a tendency to saturation beyond a certain driving voltage, while the emissions of the Ho3+ ions kept increasing. This evolution of visible EL spectra was discussed in terms of the extension of the charge recombination zone. The 1500 nm emission corresponding to the 5F55I6 transition suggests that the Ho(DBM)3bath is a potential candidate for optical communications.

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Applied Physics Letters  (Volume:84 ,  Issue: 25 )