Dresden 2009 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 22: Organic Thin Films II

DS 22.4: Vortrag

Mittwoch, 25. März 2009, 12:00–12:15, GER 38

Optical modelling of organic light emitting diodes — •Mauro Furno, Robert Nitsche, Rico Meerheim, Björn Lüssem, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Straße 1, 01062 Dresden, Germany

The general structure of an organic light emitting diode (OLED) consists of various organic and metallic layers with different functionalities [1]. Since the complexity of the device structures is rapidly increasing, optical models are more and more required for the effective design and optimization of OLEDs. We present in this contribution a numeric optical model suitable for planar OLED structures. The model exploits the well-established equivalence between light emission from electrical dipole transitions and radiation from mutually-incoherent classical electromagnetic antennas, and a transfer matrix description of the OLED coherent multilayered structure [2]. To validate model results, we fabricated and electrically and optically characterized small-molecule p-i-n type OLED [3]. The whole of angularly and spectrally resolved radiometric and photometric intensities, as well as current, power and quantum efficiencies, and CIE coordinates are fitted by calculation results exploiting consistent parameters for devices with different structural features. Due to the excellent overall agreement betweeen measurements and calculations, we generalize the model results and provide design guidelines for optically optimized OLEDs.

[1] K. Walzer et al., Chem. Rev. 107, 1233 (2007)

[2] H. Benisty et al., J.Opt. Soc. Am. A 15, 1192 (1998)

[3] R. Meerheim et al. Appl. Phys. Lett. 93, 043310 (2008)