TY - JOUR
T1 - Temperature effects on optical properties and efficiency of red AlGaInP-based light emitting diodes under high current pulse pumping
AU - Yadav, Amit
AU - Titkov, Ilya E.
AU - Sokolovskii, Grigorii S.
AU - Karpov, Sergey Yu.
AU - Dudelev, Vladislav V.
AU - Soboleva, Ksenya K.
AU - Strassburg, Martin
AU - Pietzonka, Ines
AU - Lugauer, Hans-juergen
AU - Rafailov, Edik U.
N1 - Copyright © 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 124, 013103 (2018); and may be found at https://doi.org/10.1063/1.5020266
PY - 2018/7/7
Y1 - 2018/7/7
N2 - In this paper, current-dependent emission spectra and efficiency measured on the same AlGaInP red light-emitting diode (LED) pumped with the current pulses of very different durations are recorded. This enabled for the first time distinguishing between high-carrier concentration and self-heating effects on the efficiency decline at high current magnitudes. The electron leakage to the p-side of the LED structure, which is the major mechanism of the efficiency reduction, is found to rise substantially when the device self-heating starts to develop. As a result, in comparison to continuous-wave excitation, driving the LED with sub-microsecond current pulses allows suppressing the device self-heating and, eventually, increasing the operating current by an order of magnitude without noticeable efficiency losses. Based on the reduced ABC-model, neglecting Auger recombination, the light extraction efficiency, injection efficiency, and internal quantum efficiency of the LED are estimated, suggesting light extraction to be the most critical factor for the overall efficiency of the LED. The coupled spectral/power LED characterization using the variable-duration current pulse pumping is found to be an effective approach for analyzing mechanisms of the device operation.
AB - In this paper, current-dependent emission spectra and efficiency measured on the same AlGaInP red light-emitting diode (LED) pumped with the current pulses of very different durations are recorded. This enabled for the first time distinguishing between high-carrier concentration and self-heating effects on the efficiency decline at high current magnitudes. The electron leakage to the p-side of the LED structure, which is the major mechanism of the efficiency reduction, is found to rise substantially when the device self-heating starts to develop. As a result, in comparison to continuous-wave excitation, driving the LED with sub-microsecond current pulses allows suppressing the device self-heating and, eventually, increasing the operating current by an order of magnitude without noticeable efficiency losses. Based on the reduced ABC-model, neglecting Auger recombination, the light extraction efficiency, injection efficiency, and internal quantum efficiency of the LED are estimated, suggesting light extraction to be the most critical factor for the overall efficiency of the LED. The coupled spectral/power LED characterization using the variable-duration current pulse pumping is found to be an effective approach for analyzing mechanisms of the device operation.
UR - https://aip.scitation.org/doi/10.1063/1.5020266
U2 - 10.1063/1.5020266
DO - 10.1063/1.5020266
M3 - Article
SN - 0021-8979
VL - 124
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 1
M1 - 013103
ER -