Efficient waveguide mode extraction in white organic light emitting diodes using ITO-anodes with integrated MgF_2-columns

Tobias Bocksrocker, Florian Maier-Flaig, Carsten Eschenbaum, Uli Lemmer
2012 Optics Express  
We report a simple approach to enhance the out-coupling efficiency in white organic light emitting diodes (WOLEDs). By incorporating MgF 2columns into the ITO-anode and optimizing of their geometry, an overall efficiency enhancement of up to 38% is achieved. In addition, the structuring of the anode does not lead to a change in the electrical behaviour of the devices. As evidenced by goniometric measurements, the angular emission characteristics of the WOLEDs remain unchanged. Simulations,
more » ... . Simulations, performed with the T-matrix method, reveal the effect of the enhanced outcoupling efficiency of this approach.
doi:10.1364/oe.20.006170 pmid:22418497 fatcat:i3juo7yklbhwdl4tyjr4t6hm5u