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Reduction of efficiency droop in GaInN/GaN light-emitting diodes with thick AlGaN cladding layers
An Mao,조제희,E. Fred Schubert,Joong Kon Son,Cheolsoo Sone,하우진,Sunyong Hwang,김종규 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.1
GaInN/GaN multiple-quantum-well light-emitting diodes (LEDs) with 0.4 µm-thick AlGaN cladding layers and two quantum wells (QWs), designed for investigating the origin of efficiency droop, are demonstrated to have a lower efficiency droop than typical GaInN/GaN LEDs with 5 QWs. Considering the much less electron leakage over the active region, and the larger carrier density due to the smaller active volume of the LED with AlGaN cladding layers than those of the typical LED, it is suggested that the dominant mechanism responsible for the efficiency droop is electron leakage rather than the Auger recombination which scales with the cubic power of the carrier density.
Chung-Hyun Park,조용훈,Jae-Won Choi,Joong-Kon Son,Sang-In Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
We have studied the optical properties of Au-coated InGaN/GaN quantum wells (QWs) to investigate the interaction between the surface plasmon (SP) polariton mode and the InGaN QW emission by means of SP resonance, photoluminescence (PL), and time-resolved PL techniques. A clear dispersion curve of the SP mode was found from the Au-coated layer by using angle- and wavelength-resolved SP resonance experiments. We observed that the PL peaks related to GaN were unchanged regardless of whether the QW was under an Au-coated environment or not, while the PL peak related to the active InGaN QW showed a red-shifting behavior due to the Au-coated layer. From time-resolved PL, we found a slight decrease in the decay time for the emission from the Au-coated InGaN QW area compared to that for the uncoated InGaN QW area. Although the sizes of the changes in the emission wavelength and the decay time were not so large, we can found that the SP polariton mode still affected the PL spectrum in the longer wavelength region for the Au-coated InGaN QW.