Abstract
The improvement in efficiency of nitride-based light-emitting diodes by the implementation
of a vertically stacked tandem structure is investigated. The electrical and optical
characteristics of an LED with a tunnel junction inserted between two active regions are modeled,
and the wall-plug efficiency gain of the tandem LED is shown to start at 4.2% at low output powers
(27.6 mW), with increasing efficiency gains with increased output power due to the alleviation of
efficiency droop. The TLED concept further enables optimization of device structure, allowing
removal of electron blocking layer, and optimization of number of quantum wells for improvement in
efficiency.
© 2014 IEEE
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