The authors have demonstrated the structure optimization for high-efficiency white organic light-emitting diodes (WOLEDs) using codoped blue emitting layers with different functional materials or hybrid-spacer between emitting layers. The optimized WOLEDs characteristics showed the maximum external quantum efficiency of 11.8%, the maximum luminous efficiency of 25.29 cd/A, and Commission Internationale de I'Eclairage coordinates of (x=0.37, y=0.38), respectively.

© 2008 Optical Society of America

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