Photonic Band Engineering in Metallic Microcavity OLEDs
Allemeier, David
Allemeier, David
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Abstract
A periodic metallic OLED microvaity structure is shown to constitute a 1D photonic crystal, with the potential to provide a new pathway towards electrically pumped organic lasers, white OLEDs and narrow linewidth emission sources. We demonstrate the formation of photonic energy bands by stacking up to six metallic microcavities and observing the angle-resolved photoemission under electrical pumping. The experimental work allows direct observation of the interaction of individual cavity modes with the coupled microcavity superlattice and confirms predictions made by transfer matrix simulations of the device structures. The splitting of the local cavity modes is found to directly mimic the formation of energy bands from Bloch and molecular orbital (MO) theory. The resulting energy band structure is manipulated by varying the thickness of the metallic mirrors and the cavities, including the formation of a photonic band gap by the introduction of a Peierls distortion to the 1D crystal.
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Graduate
Date
2021-01-01