OLED with minimal plasmonic losses

A top-emitting organic light emitting device (OLED) comprising:

• a substrate having an inward side and an outward side;
• a non-metallic, diffuse reflective layer with a roughened top surface and a bottom surface disposed over the substrate with the roughened top surface disposed over the bottom surface;
• a high refractive index waveguide layer disposed over the reflective layer;
• and
• an OLED body disposed over the reflective layer, the OLED body comprising:
• a transparent bottom electrode disposed over high refractive index waveguide layer,
• an organic emissive layer disposed over the transparent bottom electrode, and
• a transparent top electrode disposed over the organic emissive layer;
• wherein a majority of light emitted by the OLED during operation is emitted through the transparent top electrode.