Enhanced OLED outcoupling by suppressing surface plasmon modes

A organic light emitting device (OLED), comprising:

• a transparent substrate having a first side and a second side;
• an emissive region disposed over the first side of the transparent substrate, the emissive region comprising:
• a transparent first electrode disposed over the transparent substrate;
• at least one organic emissive layer disposed over the transparent first electrode;
• and
• a transparent second electrode disposed over the at least one organic emissive layer;
• an organic layer disposed over the second electrode layer;
• a metal optical grating layer disposed on the organic layer, wherein the metal optical grating layer having a grating structure having a sub-wavelength periodicity disposed on the transparent second electrode;
• and
• a reflective layer disposed over the metal optical grating layer.