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  • Efficient waveguide mode extraction in white organic light emitting diodes using ITO-anodes with integrated MgF₂-columns.

Efficient waveguide mode extraction in white organic light emitting diodes using ITO-anodes with integrated MgF₂-columns.

Optics express (2012-03-16)
Tobias Bocksrocker, Florian Maier-Flaig, Carsten Eschenbaum, Uli Lemmer
ABSTRACT

We report a simple approach to enhance the out-coupling efficiency in white organic light emitting diodes (WOLEDs). By incorporating MgF₂-columns 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, performed with the T-matrix method, reveal the effect of the enhanced outcoupling efficiency of this approach.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Magnesium fluoride, technical grade
Sigma-Aldrich
Magnesium fluoride, pieces, 3-6 mm, 99.9% trace metals basis (excluding Na)
Sigma-Aldrich
Magnesium fluoride, random crystals, optical grade, ≥99.99% trace metals basis