Efficiency droop of GaN lasers and LEDs

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The density/current dependence of the internal efficiency (IQE) in GaN-based light emitting devices (LED) is commonly modelled using a cubic polynomial called the ABC law. Here, a linear density (N) dependence, AN, represents defect recombinations, a quadratic term, BN2, is used for radiative losses and an Auger-like cubic term, CN3, is used to model the droop-causing losses. The model has been shown to be able to reproduce experimentally measured data quite successfully. However, when treating all three parameters, A, B, and C, as freely adjustable parameters fits of a single IQE curve usually leave a rather high degree of uncertainty. E.g., virtually identical results can be obtained varying the Auger coefficient by more than one order of magnitude if at the same time A and B are adjusted accordingly. This uncertainty not only obscures the accurate values for the strengths of the underlying mechanisms, but also prevents the model to be able to determine other dependencies like that on temperature which could yield more insight into which physical processes may be responsible for the droop.

Original languageEnglish (US)
Title of host publication2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
PublisherIEEE Computer Society
DOIs
StatePublished - 2013
Event2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany
Duration: May 12 2013May 16 2013

Other

Other2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
CountryGermany
CityMunich
Period5/12/135/16/13

Fingerprint

Light emitting diodes
Lasers
Current density
Polynomials
Defects
Temperature
Uncertainty

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Hader, J., Moloney, J. V., & Koch, S. W. (2013). Efficiency droop of GaN lasers and LEDs. In 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 [6800733] IEEE Computer Society. https://doi.org/10.1109/CLEOE-IQEC.2013.6800733

Efficiency droop of GaN lasers and LEDs. / Hader, Jorg; Moloney, Jerome V; Koch, Stephan W.

2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013. IEEE Computer Society, 2013. 6800733.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hader, J, Moloney, JV & Koch, SW 2013, Efficiency droop of GaN lasers and LEDs. in 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013., 6800733, IEEE Computer Society, 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013, Munich, Germany, 5/12/13. https://doi.org/10.1109/CLEOE-IQEC.2013.6800733
Hader J, Moloney JV, Koch SW. Efficiency droop of GaN lasers and LEDs. In 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013. IEEE Computer Society. 2013. 6800733 https://doi.org/10.1109/CLEOE-IQEC.2013.6800733
Hader, Jorg ; Moloney, Jerome V ; Koch, Stephan W. / Efficiency droop of GaN lasers and LEDs. 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013. IEEE Computer Society, 2013.
@inproceedings{8cc4b976a0774eccbb4b36e1cf308889,
title = "Efficiency droop of GaN lasers and LEDs",
abstract = "The density/current dependence of the internal efficiency (IQE) in GaN-based light emitting devices (LED) is commonly modelled using a cubic polynomial called the ABC law. Here, a linear density (N) dependence, AN, represents defect recombinations, a quadratic term, BN2, is used for radiative losses and an Auger-like cubic term, CN3, is used to model the droop-causing losses. The model has been shown to be able to reproduce experimentally measured data quite successfully. However, when treating all three parameters, A, B, and C, as freely adjustable parameters fits of a single IQE curve usually leave a rather high degree of uncertainty. E.g., virtually identical results can be obtained varying the Auger coefficient by more than one order of magnitude if at the same time A and B are adjusted accordingly. This uncertainty not only obscures the accurate values for the strengths of the underlying mechanisms, but also prevents the model to be able to determine other dependencies like that on temperature which could yield more insight into which physical processes may be responsible for the droop.",
author = "Jorg Hader and Moloney, {Jerome V} and Koch, {Stephan W}",
year = "2013",
doi = "10.1109/CLEOE-IQEC.2013.6800733",
language = "English (US)",
booktitle = "2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013",
publisher = "IEEE Computer Society",

}

TY - GEN

T1 - Efficiency droop of GaN lasers and LEDs

AU - Hader, Jorg

AU - Moloney, Jerome V

AU - Koch, Stephan W

PY - 2013

Y1 - 2013

N2 - The density/current dependence of the internal efficiency (IQE) in GaN-based light emitting devices (LED) is commonly modelled using a cubic polynomial called the ABC law. Here, a linear density (N) dependence, AN, represents defect recombinations, a quadratic term, BN2, is used for radiative losses and an Auger-like cubic term, CN3, is used to model the droop-causing losses. The model has been shown to be able to reproduce experimentally measured data quite successfully. However, when treating all three parameters, A, B, and C, as freely adjustable parameters fits of a single IQE curve usually leave a rather high degree of uncertainty. E.g., virtually identical results can be obtained varying the Auger coefficient by more than one order of magnitude if at the same time A and B are adjusted accordingly. This uncertainty not only obscures the accurate values for the strengths of the underlying mechanisms, but also prevents the model to be able to determine other dependencies like that on temperature which could yield more insight into which physical processes may be responsible for the droop.

AB - The density/current dependence of the internal efficiency (IQE) in GaN-based light emitting devices (LED) is commonly modelled using a cubic polynomial called the ABC law. Here, a linear density (N) dependence, AN, represents defect recombinations, a quadratic term, BN2, is used for radiative losses and an Auger-like cubic term, CN3, is used to model the droop-causing losses. The model has been shown to be able to reproduce experimentally measured data quite successfully. However, when treating all three parameters, A, B, and C, as freely adjustable parameters fits of a single IQE curve usually leave a rather high degree of uncertainty. E.g., virtually identical results can be obtained varying the Auger coefficient by more than one order of magnitude if at the same time A and B are adjusted accordingly. This uncertainty not only obscures the accurate values for the strengths of the underlying mechanisms, but also prevents the model to be able to determine other dependencies like that on temperature which could yield more insight into which physical processes may be responsible for the droop.

UR - http://www.scopus.com/inward/record.url?scp=84900335891&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84900335891&partnerID=8YFLogxK

U2 - 10.1109/CLEOE-IQEC.2013.6800733

DO - 10.1109/CLEOE-IQEC.2013.6800733

M3 - Conference contribution

AN - SCOPUS:84900335891

BT - 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013

PB - IEEE Computer Society

ER -