A device having a four sub-pixels pixel, the pixel comprising: a first organic light emitting device that emits light having a peak wavelength in the visible spectrum of 600 - 700 nm, further comprising a first emissive layer having a first emissive material, wherein the first emissive material emits light from its triplet state; a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500 - 600 nm, further comprising a second emissive layer having a second emissive material, wherein the second emissive material emits light from its triplet state; a third organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 - 500 nm, further comprising a third emissive layer having a third emissive material, wherein the third emissive material emits light from its triplet state; and a fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, further comprising a fourth emissive layer having a fourth emissive material; wherein the third and fourth organic light-emitting devices have different emissive materials; wherein at least one of the following (a) and (b) holds true: (a) the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device; and (b) the third organic light emitting device emits light having a CIE y coordinate less than 0.25 and the fourth organic light emitting device emits light having a CIE y coordinate at least 0.02 less than that of light emitted by the third organic light emitting device. a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500 - 600 nm, further comprising a second emissive layer having a second emissive material, wherein the second emissive material emits light from its triplet state; a third organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 - 500 nm, further comprising a third emissive layer having a third emissive material, wherein the third emissive material emits light from its triplet state; and a fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, further comprising a fourth emissive layer having a fourth emissive material; wherein the third and fourth organic light-emitting devices have different emissive materials; wherein at least one of the following (a) and (b) holds true: (a) the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device; and (b) the third organic light emitting device emits light having a CIE y coordinate less than 0.25 and the fourth organic light emitting device emits light having a CIE y coordinate at least 0.02 less than that of light emitted by the third organic light emitting device. (a) the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device; and (b) the third organic light emitting device emits light having a CIE y coordinate less than 0.25 and the fourth organic light emitting device emits light having a CIE y coordinate at least 0.02 less than that of light emitted by the third organic light emitting device. <EOS>