Patent ID: 7816859

Claim:
A tandem white light-emitting OLED device comprising: a. a spaced anode and cathode wherein the cathode is reflective metal including aluminum or an alloy of aluminum and the anode is a light transmissive conductive metal oxide; b. a first white light emitting unit having an emission spectrum that includes a first set of at least two emission peaks that are more intense than any other emission peaks that may be present in the emission spectrum of the first white light-emitting unit, such first set including: i. a first blue spectral component having a first blue peak emission wavelength of between 440 and 490 nm; and ii. a yellow spectral component having a yellow peak emission wavelength of between 550 and 590 nm; c. a second white light-emitting unit disposed closer to the reflective metal cathode than the first white light-emitting unit, such second white light-emitting unit having an emission spectrum that includes a second set of at least three emission peaks that are more intense than any other emission peaks that may be present in the emission spectrum of the second white light-emitting unit, such second set including: i. a second blue spectral component having a second blue peak emission wavelength of between 440 and 490 nm; ii. a green spectral component having a peak emission wavelength of between 500 and 540 nm; and iii. a red spectral component having a peak emission wavelength of between 600 and 700 nm; and d. an intermediate connector disposed between the first and second white light-emitting units.