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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