Document Type

Article

Original Publication Date

2009

Journal/Book/Conference Title

Applied Physics Letters

Volume

95

Issue

12

DOI of Original Publication

10.1063/1.3236538

Comments

Originally published at http://dx.doi.org/10.1063/1.3236538

Date of Submission

April 2015

Abstract

We investigated the internal quantum efficiency (IQE) and the relative external quantum efficiency (EQE) of m-plane InGaN light emitting diodes(LEDs) grown on m-plane freestanding GaN emitting at ∼400 nm for current densities up to 2500 A/cm2. IQE values extracted from intensity and temperature dependent photoluminescencemeasurements were consistently higher, by some 30%, for the m-plane LEDs than for reference c-plane LEDs having the same structure, e.g., 80% versus 60% at an injected steady-state carrier concentration of 1.2×1018 cm−3. With increasing current injection up to 2500 A/cm2, the maximum EQE is nearly retained in m-plane LEDs, whereas c-plane LEDs exhibit approximately 25% droop. The negligible droop in m-plane LEDs is consistent with the reported enhanced hole carrier concentration and light holes in m-plane orientation, thereby enhanced hole transport throughout the active region, and lack of polarization induced field. A high quantum efficiency and in particular its retention at high injection levels bode well for m-plane LEDs as candidates for general lighting applications.

Rights

Li, X., Ni, X., Lee, J., et al. Efficiency retention at high current injection levels in m-plane InGaN light emitting diodes. Applied Physics Letters, 95, 121107 (2009). Copyright © 2009 AIP Publishing LLC.

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VCU Electrical and Computer Engineering Publications

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