Materials and methods for organic light-emitting device microcavity

A microcavity for an organic light-emitting device, the microcavity comprising:

• a substrate comprising a first reflective electrode;
• a dry film organic material layer formed on the substrate and comprising a first surface facing the substrate and a second surface opposite the first surface;
• an emitting layer over the dry film organic material layer such that the dry film organic material layer is between the first reflective electrode and the emitting layer, the emitting layer comprising a light-emitting organic material that emits light, upon excitation, at a peak emission wavelength;
• and
• a second reflective electrode over the emitting layer such that the emitting layer is between the first reflective electrode and the second reflective electrode,
• wherein the second surface exhibits a surface roughness of from about 5.0 nm to about 1.0 μm as the root mean squared of surface thickness deviations in an area 10×10 μm2, the organic light-emitting device stack exhibits an increase in luminosity by a factor of from about 1.01 to about 2.0 relative to the luminosity of the same microcavity but with a second surface having surface roughness of less than 5.0 nm expressed as the root mean square of the surface thickness deviation in an area 10×10 μm2, at least one of the first and second reflective electrodes is semi-transparent, the first reflective electrode and the second reflective electrode are separated from one another by a distance, the distance corresponds to a depth of the microcavity, and the depth of the microcavity is configured for resonance emission of the peak emission wavelength.