4.2: Highly Efficient Top-Emitting White Organic Electroluminescent Devices
نویسندگان
چکیده
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, CFxcoated Ag anode with modified reflectivity and an index-matching layer (SnO2) 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/cm2 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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