Low-voltage organic electroluminescence device with an ultrathin, hybrid structure

Heithecker, Dirk; Kammoun, Anis; Dobbertin, Thomas; Riedl, Thomas; Becker, Eike; Metzdorf, Dirk; Schneider, Daniel; Johannes, Hans-Hermann; Kowalsky, Wolfgang
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4178
Academic Journal
We have prepared organic light-emitting diodes with a narrow recombination zone confined by an organic double-heterojunction structure using both polymer and small molecules (a hybrid structure). In these light-emitting diodes, we used very thin small molecule layers, down to a total thickness of 40 nm, to achieve an exponential forward characteristic. These layers were evaporated on a highly conductive layer of PEDT:PSS for a high-yield process and for good charge injection at the anode. Although no doping processes were applied during device fabrication, either at the injecting electrodes or in the Alq[SUB3] layer, the diodes attained high brightness at very low voltage, for instance, 10.000 cd/m[SUP2] at voltage of 4.7 V.


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