
319Gallium Nitride-Based Interband Tunnel Junctions
The cascaded LED structure not only provides an enhancement of external quan-
tum efciency (EQE) but also suppresses joule heating. The total power dissipated due
to series resistance of an LED is P
R
= I
2
R
s
. For a given output power, R
s
∝ N and I ∝
1/N, and therefore, power dissipated is proportional to 1/N, which implies that increas-
ing N enables high power operation of LEDs with higher efciency while reducing
overall heat generation. This not only can enhance efciency but also can enable LED
operation at elevated output power, and could eliminate thermal management issues.
Although the proof ...