Organic electroluminescent devices

A device comprising:

• at least one pixel comprising three or more sub-pixels, with each sub-pixel comprising:
• a substrate;
• a first electrode;
• an organic emissive layer comprising an organic emissive material disposed over the electrode;
• and
• an enhancement layer, comprising a plasmonic material exhibiting surface plasmon resonance that non-radiatively couples to the organic emissive material and transfer excited state energy from the emissive material to non-radiative mode of surface plasmon polaritons, disposed over the organic emissive layer opposite from the first electrode,
• an outcoupling layer disposed over the enhancement layer, wherein the outcoupling layer scatters or extracts the energy from the surface plasmon polaritons as photons to free space;
• and
• a color altering layer disposed over the outcoupling layer, where there is an overlap between a transmission spectrum of the color altering layer and an emission spectrum of light output from the outcoupling layer,
• wherein for at least one sub-pixel of the three or more sub-pixels, a full width half maximum (FWHM) of a light emission or transmission spectrum from the color altering layer is between 30 nm greater than or 30 nm less than the FWHM of a light emission spectrum from the outcoupling layer.