Special Section on Organic Light-Emitting Materials and Devices

Periodic nanostructuring for guided mode extraction in organic light-emitting diodes

[+] Author Affiliations
Julian Hauss, Boris Riedel

Light Technology Institute, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, D-76131 Karlsruhe, Germany

Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, Kaiserstr. 2, D-24143 Kiel, Germany

Sebastian Gleiss, Uli Lemmer

Light Technology Institute, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, D-76131 Karlsruhe, Germany

Ulf Geyer, Martina Gerken

Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, Kaiserstr. 2, D-24143 Kiel, Germany

J. Photon. Energy. 1(1), 011012 (February 03, 2011). doi:10.1117/1.3544495
History: Received August 15, 2010; Revised December 17, 2010; Accepted December 30, 2010; Published February 03, 2011; Online February 03, 2011
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We investigated guided mode extraction in organic light-emitting diodes and compare the experimental findings to transfer matrix (T-matrix) and finite difference time domain (FDTD) simulations. To this end, we patterned the indium tin oxide anode with Bragg gratings with lattice constants from 300 to 600 nm and varied the depth of the grating structures. The structuring was done by laser interference lithography and plasma etching. Both techniques allow for a rapid large area processing. We measured angle resolved electroluminescent spectra of the nanostructured devices and reference devices. To obtain the mode distribution in the devices we made use of T-matrix simulations. In addition we performed FDTD simulations of the emission characteristics of the patterned devices. The simulations are in agreement with our experimental findings and give insight into the outcoupling mechanisms.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Julian Hauss ; Boris Riedel ; Sebastian Gleiss ; Ulf Geyer ; Uli Lemmer, et al.
"Periodic nanostructuring for guided mode extraction in organic light-emitting diodes", J. Photon. Energy. 1(1), 011012 (February 03, 2011). ; http://dx.doi.org/10.1117/1.3544495


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