Abstract
This work examines the effects of polarization-related electric fields on the
energy band diagrams, wavelength shift, wave function overlap, and efficiency droop for
InGaN quantum wells on various crystal orientations, including polar (0001) (<i>c</i>-plane),
semipolar (20<sup>-</sup>21), semipolar
(20<sup>-</sup>2<sup>-</sup>1, and nonpolar
(10<sup>-</sup>10) (<i>m</i>-plane). Based on simulations, we show
that the semipolar (20<sup>-</sup>2<sup>-</sup>1) orientation exhibits
excellent potential for the development of high-efficiency, low-droop light-emitting
diodes (LEDs). We then present recent advancements in crystal growth, optical
performance, and thermal performance of semipolar
(20<sup>-</sup>2<sup>-</sup>1) LEDs. Finally, we demonstrate a
low-droop, high-efficiency single-quantum-well blue semipolar
(20<sup>-</sup>2<sup>-</sup>1) LED with an external quantum efficiency
of more than 50% at 100 A/cm<sup>2</sup>.
© 2013 IEEE
PDF Article
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