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We have developed highly efficient white top-emitting organic light-emitting devices (TOLEDs) with broad emission by modifying both anode and cathode. To alleviate the undesirable microcavity effect and obtain "broad" white emission, CF xcoated Ag anode with modified reflectivity and an index-matching layer (SnO 2 ) capped on thin Ca/Ag cathode with a maximal transparency of 80% were employed. A top-emitting broad white light device based on the dual layer architecture of light blue and yellow emitters with one of the highest EL efficiencies of 22.2 cd/A (9.6 lm/W) at 20 mA/cm 2 and 7.3 V with Commission Internationale d'Eclairage (CIE) coordinates of (x＝0.31, y＝ 0.47) has been demonstrated.

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