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 language | English (US) |
|---|---|
| Title of host publication | 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 |
| Publisher | IEEE Computer Society |
| DOIs | |
| State | Published - 2013 |
| Event | 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany Duration: May 12 2013 → May 16 2013 |
Other
| Other | 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 |
|---|---|
| Country | Germany |
| City | Munich |
| Period | 5/12/13 → 5/16/13 |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
Cite this
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 proceeding › Conference contribution
}
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 -