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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.6: Poster

Monday, March 7, 2005, 18:00–20:00, Poster TU A

A highly efficient top emission organic light-emitting diode with gold as the top electrode — •Qiang Huang, Karsten Walzer, Martin Pfeiffer, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden

We demonstrate an efficient top-emitting organic light-emitting diode (OLED) with organic layers sandwiched between a highly reflective metal anode and a semi-transparent thin Au film as cathode. The device shows deep red color with external quantum efficiency of 4.5% at the luminance of 100cd/m2. To improve the electron injection from Au, an n- doped CuPc layer is used. The OLED exhibits superior current-voltage characteristics over a comparable bottom emission device with ITO as anode. Since the device uses doped transport layers, a luminance of 100cd/m2 and 1000cd/m2 can be reached already at voltages as low as 2.6V and 3.3V respectively. By further introducing of an organic layer such as Bphen above the top electrode, the efficiency of the device can be improved by around 50%.