Berlin 2005 – scientific programme
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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.13: Poster
Monday, March 7, 2005, 18:00–20:00, Poster TU A
Multilayer OLED based on derivatives of perylene — •Stephan Benning1, Marcus Lauhof1, Heinz Langhals2, Harald Bock3, and Heinz Kitzerow1 — 1University of Paderborn, Warburger Str. 100, 33098 Paderborn — 2Department of Chemistry, LMU University Munich, Butenandtstr. 13, D-81377 Munich — 3Centre de Recherche Paul Pascal, CNRS, Université Bordeaux I, Avenue A. Schweitzer, F-33600 Pessac
Recently, we presented single layer organic light emitting diodes with perylene-3,4:9,10-tetracarboxylic-acid ethylester (PeC2). A brightness up to 100 Cd/m2 was achieved which is comparable to a notebook panel [1]. Here, efforts to improve the efficiency by additional layers are described. TPD is used as hole transporting layer and N,N’-bis(1-hexylheptyl)-3,4:9,10-perylene-bis-(dicarboximide) as an electron conducting layer. The latter compound (also known as S-13) is a convenient standard for the determination of fluorescence quantum efficiencies [2]. A device containing three organic layers with the layer sequence ITO / TPD / PeC2 / S-13 / Al shows a brightness of 400 Cd/m2. We speculate that both, PeC2 and S-13, contribute to the emission.
[1] Th. Hassheider, S. A. Benning, H.-S. Kitzerow, M.-F. Achard, H. Bock, Angewandte Chemie International Edition, Vol. 40, No. 11, 2060-2063, 2001 [2] H. Langhals, J. Karolin, L. B.-A. Johansson, J. Chem. Soc., Faraday Trans., Vol. 94, 2919-2922, 1998