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

Zang, F.X.; Li, W.L.; Hong, Z.R.; Wei, H.Z.; Li, M.T.; Sun, X.Y.; Lee, C.S.
June 2004
Applied Physics Letters;6/21/2004, Vol. 84 Issue 25, p5115
Academic Journal
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 5F5→5I6 transition suggests that the Ho(DBM)3bath is a potential candidate for optical communications.


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