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Conclusion
 The light output power of the step-stage LED measured
are 363.8 mW at 350 mA corresponding to an EQE
of36.7%, which represents a 23% increase over that of
dual-stage LED.
References
 [1] S. Nakamura, “InGaN-based blue light-emitting diodes
and laser diodes,” J. Cryst. Growth, vol. 201, pp. 290–295,
1999.
 [2] Y. T. Rebane, Y. G. Shreter, B. S. Yavich, V. E.Bougrov,
S. I. Stepanov, and W. N. Wang, “Light emitting diode
with charge asymmetric resonance tunneling,” Phys.
Status Solidi A, vol. 180, pp.121–126, 2000.