A microcavity OLED, consisting of a conventional OLED stack with two metallic mirror electrodes, shows narrow-band emission centered around specific peak resonant wavelengths. These cavity modes are analogous to the energy states found in any resonator system, including musical instrument strings and 1-dimensional quantum square wells. Here we incorporate the microcavity OLED as a unit cell in a photonic crystal. Stacking N microcavities splits the resonant modes into N discrete states. We demonstrate methods to control the photonic density of states and to induce a photonic bandgap. Furthermore, we investigate the effect of various device variables, including N and the thickness of the semi-transparent metal electrodes, on emission properties such as peak wavelength, FWHM, and Q-factor for each of the photonic states. The experimental results are guided by a predictive computational modelling tool, which is critically important for the complex-architecture devices.
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