Approaches for high internal quantum efficiency green InGaN light-emitting diodes with large overlap quantum wells | Zendy

Hongping Zhao | Zendy; Guangyu Liu | Zendy; Jing Zhang | Zendy; Jonathan D. Poplawsky | Zendy; Volkmar Dierolf | Zendy; Nelson Tansu | Zendy

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Approaches for high internal quantum efficiency green InGaN light-emitting diodes with large overlap quantum wells

Author(s) -

Hongping Zhao,

Guangyu Liu,

Jing Zhang,

Jonathan D. Poplawsky,

Volkmar Dierolf,

Nelson Tansu

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.00a991

Subject(s) - light emitting diode , optoelectronics , quantum well , quantum efficiency , materials science , indium gallium nitride , spontaneous emission , diode , nitride , carrier generation and recombination , optics , physics , semiconductor , layer (electronics) , laser , nanotechnology

Optimization of internal quantum efficiency (IQE) for InGaN quantum wells (QWs) light-emitting diodes (LEDs) is investigated. Staggered InGaN QWs with large electron-hole wavefunction overlap and improved radiative recombination rate are investigated for nitride LEDs application. The effect of interface abruptness in staggered InGaN QWs on radiative recombination rate is studied. Studies show that the less interface abruptness between the InGaN sub-layers will not affect the performance of the staggered InGaN QWs detrimentally. The growths of linearly-shaped staggered InGaN QWs by employing graded growth temperature grading are presented. The effect of current injection efficiency on IQE of InGaN QWs LEDs and other approaches to reduce dislocation in InGaN QWs LEDs are also discussed. The optimization of both radiative efficiency and current injection efficiency in InGaN QWs LEDs are required for achieving high IQE devices emitting in the green spectral regime and longer.

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