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Saint Petersburg, Russia

Zakheim D.A.,RAS Ioffe Physical - Technical Institute | Pavluchenko A.S.,Epi Center | Bauman D.A.,JSC Svetlana Optoelectronics | Bulashevich K.A.,STR Group Soft Impact Ltd. | And 2 more authors.
Physica Status Solidi (A) Applications and Materials Science | Year: 2012

In this paper, we report on the results of experimental and theoretical study of a promising way for suppression of the efficiency droop with current in InGaN-based light emitting diodes. Simulations carried out using a drift-diffusion approach with quantum-mechanical corrections clearly show that non-radiative Auger recombination is the principal mechanism limiting the device performance at high-injection level. New design of LED heterostructure with short-period superlattice in the active region is proposed and assessed theoretically. Experimentally, the implementation of the structure design in high-power devices has resulted in substantial suppression of the efficiency droop compared to conventional multiquantum-well InGaN LEDs. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Avakyants L.P.,Moscow State University | Bokov P.Y.,Moscow State University | Chervyakov A.V.,Moscow State University | Chuyas A.V.,Moscow State University | And 5 more authors.
Semiconductors | Year: 2010

Interference effects in InGaN/AlGaN/GaN light-emitting-diode heterostructures of blue emission are studied by spectroscopy of electroreflectance and electroluminescence. The periodic bands observed in the electroreflectance and electroluminescence spectra in a blue spectral range are caused by interference effects in the structure in general. The emergence of interference fringes in the electroreflection spectra is explained by modulation of built-in electric fields in the active region of the heterostructure. The long-period interference fringes observed in the electroreflectance spectra in a wide spectral range from infrared to ultra-violet allows one to determine the location of the active region of the heterostructure with respect to different reflecting surfaces in the cavity. © 2010 Pleiades Publishing, Ltd.

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