High Symmetry Metal-Dielectric Photonic Crystal Organic Light Emitting Diodes With Single- Cavity Unit Cells

摘要

Vertically-stacked organic light emitting diode (OLED) microcavities form 1Dmetal-dielectric photonic crystals (MDPC) with many degrees of freedom forengineering complex emission profiles. The photonic band structure of theMDPC OLED is determined by the underlying unit cell and is particularly sensitiveto the properties of the metallic electrodes. The electronic requirementsof microcavity OLED fabrication often necessitate dissimilar metallic electrodesto achieve good performance. This can profoundly impact the photonicproperties of a MDPC by doubling the unit cell length. This work presents aMDPC OLED formed with single-cavity unit cells by employing optically similarAg alloys as the semi-transparent electrode materials. The crystal is foundto display a single photonic band without a band gap up to eight stacked cavities.The states within the band are evenly-spaced and clearly resolved, whichis critical for applications seeking to utilize specific photonic states. Designconsiderations are presented for optimizing the photonic behavior of MDPCOLEDs through selective control of the optical properties of metallic alloys.