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Energies 2017, 10(9), 1277; doi:10.3390/en10091277

The Effect of Imbalanced Carrier Transport on the Efficiency Droop in GaInN-Based Blue and Green Light-Emitting Diodes

1
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; junhyuk@postech.ac.kr
2
School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 54896, Korea
3
Department for Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA; efschubert@rpi.edu
*
Authors to whom correspondence should be addressed.
Received: 21 July 2017 / Revised: 18 August 2017 / Accepted: 24 August 2017 / Published: 27 August 2017
(This article belongs to the Special Issue Solid State Lighting)
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Abstract

The effect of strongly-imbalanced carrier concentration and mobility on efficiency droop is studied by comparing the onset voltage of high injection, the onset current density of the droop, and the magnitude of the droop, as well as their temperature dependence, of GaInN-based blue and green light-emitting diodes (LEDs). An n-to-p asymmetry factor is defined as σn/σp, and was found to be 17.1 for blue LEDs and 50.1 for green LEDs. Green LEDs, when compared to blue LEDs, were shown to enter the high-injection regime at a lower voltage, which is attributed to their less favorable p-type transport characteristics. Green LEDs, with lower hole concentration and mobility, have a lower onset current density of the efficiency droop and a higher magnitude of the efficiency droop when compared to blue LEDs. The experimental results are in quantitative agreement with the imbalanced carrier transport causing the efficiency droop, thus providing guidance for alleviating the phenomenon of efficiency droop. View Full-Text
Keywords: nitride semiconductor; LED; efficiency droop; carrier transport nitride semiconductor; LED; efficiency droop; carrier transport
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Park, J.H.; Cho, J.; Schubert, E.F.; Kim, J.K. The Effect of Imbalanced Carrier Transport on the Efficiency Droop in GaInN-Based Blue and Green Light-Emitting Diodes. Energies 2017, 10, 1277.

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