Abstract

Significant performance enhancement of a green hybrid inorganic-organic light-emitting diode (HyLED) based on a simplified ${{WO}}_{3}$ /organic layer structure has been achieved through structure optimization. A 20–50 nm as-deposited ${{WO}}_{3}$ layer allowed for facile hole injection and transport. In the meantime, it had high transparency and good robustness required for efficient and reliable operation of the HyLED. Inserting a 30 nm undoped 4,4 $^{\prime}$ -N,N $^{\prime}$ -dicarbazolebiphenyl (CBP) layer between the ${{WO}}_{3}$ and emitting layer resulted in a broadened exciton generation zone and improved the brightness by 87.4% at 20 ${{mA/cm}}^{2}$ . At this injection level, the optimized HyLED reached a luminance of 11642 ${{cd/m}}^{2}$ and a current efficiency of 58.2 cd/A, and exhibited good reliability under constant-current stressing.

© 2013 IEEE

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