Berlin 2005 – scientific programme

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.1: Poster

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

White light emission from p-i-n OLEDs — •Gregor Schwartz, Karsten Fehse, Karsten Walzer, Sebastian Reineke, Martin Pfeiffer, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden

In the last several years, the development of new materials and device structures in the field of small molecule organic light emitting devices (OLEDs) have led to the demonstration of highly efficient single color devices. Therefore, as the next step, white OLEDs which combine multiple colors into one device are promising to become the future light sources for large area light emision, e.g. in display backlighting or illumination. We present first data on such devices that include two or three emission layers of different color into our well established p-i-n structure with electrically doped charge transport layers. We discuss their electro-optical properties like CIE color coordinates, color rendering and the important issue of power efficiency. Detailed studies on the charge carrier transport and balance are carried out to find optimum conditions both for electrical properties and color matching. We show that the white-point can be matched by following the three color approach. The aim of high power efficiency is followed by the preferred application of triplet emitters.