| abstract |
An OLED device is described comprising a substrate having thereon a cascaded organic electroluminescent device comprising: a) an anode; b) a cathode; c) a plurality of cascaded organic electroluminescent units disposed between the anode and the cathode, wherein each organic electroluminescent unit includes at least one light-emitting layer and wherein the plurality of cascaded units includes at least two units that emit light of different colors; and d) a connecting unit disposed between each adjacent cascaded organic electroluminescent unit; and e) a colored filter that filters the emitted light. |