Abstract
The photo- and electroluminescence properties of solution-processed organic light-emitting diodes (OLEDs) consisting of composites of PVK as a host with [Zn(salophen)] or [Zn(sal-3,4-ben)] as guests were studied. Devices consisted of a single spin-coated active layer. The electro-optical properties (voltage turn-on (Von), brightness (Lmax) and current efficiency (ηcurr)) of the coordination compounds were better than those of the ligands. This improvement can be explained by the increase of the hole mobility (μp) compared to the PVK and PVK:salicylidenes composites. The Lmax and ηcurr were three times higher for the PVK:[Zn(sal-3,4-ben)] (Von = 6.5 V; Lmax = 131 cd m−2; ηcurr = 36 mcd A−1) diode than the PVK:[Zn(salophen)] (Von = 9.5 V; Lmax = 52 cd m−2; ηcurr = 11 mcd A−1) due to the increase of the hole mobilities of μp([Zn(sal-3,4-ben)]) ∼ 102xμp([Zn(salophen)]). Moreover, the PVK:[Zn(sal-3,4-ben)] diode presented Lmax and ηcurr comparable to the PVK:8-hydroxyquilinate compounds (Alq3 and Znq2) prepared using the same procedure which can be explained by the hole mobilities of these composites and photoluminescence quantum yields (PLQY) of the coordination compounds.
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