Highly efficient top-emitting white organic electroluminescent devices

Hsu, Shih-Feng; Lee, Chung-Chun; Hwang, Shiao-Wen; Chen, Chin H.
June 2005
Applied Physics Letters;6/20/2005, Vol. 86 Issue 25, p253508
Academic Journal
We have developed highly efficient white top-emitting organic light-emitting devices with broad emission by modifying both the anode and cathode. To alleviate the undesirable microcavity effect and obtain “broad” white emission, a CFx-coated Ag anode and an index-matching layer (SnO2) capped on a thin Ca/Ag cathode with a maximum 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 coordinates of (x=0.31,y=0.47), has been demonstrated.


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