Regensburg 2004 – wissenschaftliches Programm
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SYOH: Organic and Hybrid Systems for Future Electronics
SYOH 5: Poster
SYOH 5.81: Poster
Donnerstag, 11. März 2004, 18:00–21:00, B
Polymer electrophosphorescence with high power conversion efficiencies — •Xiaohui Yang1, Frank Jaiser1, Dieter Neher1, Dirk Hertel2, Thomas Däubler2, and Klaus Bonrad2 — 1University of Potsdam, Institute of Physics, Am Neuen Palais 10, 14469 Potsdam, Germany — 2Schott Spezialglas GmbH, Hattenbergstraße 10, 55122 Mainz, Germany
We demonstrate efficient single-layer polymer phosphorescent light-emitting devices based on a green-emitting iridium-complex blended into the polymer host poly (N-vinyl carbazole), co-doped with electron-transporting and hole-transporting molecules. Efficiencies and current densities of the devices increase with increasing iridium-complex concentration. The devices with high iridium complex concentration can be operated at relatively low voltages, resulting in a large power conversion efficiency of up to 19.2 lm/W at luminance efficiencies exceeding 30 cd/A. The overall performances of these devices are approaching those of small molecule multilayer devices, which suggests that efficient electrophosphorescent devices with acceptable operating voltages can be achieved in very simple device structure fabricated by spin-coating.