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Numerical investigation on quantum-confined stark effect and polarization effect of short-wavelength LEDs



  1. College of New Energy of Xi’an Shiyou University, Xi’an 710065, China
  2. Longgi Green Energy Technology Co., Ltd, Block B, No.8989 Shangji Road, Economic and Technological Development Zone, Xi’an, China


Due to the intrinsic properties of larger-mismatched, stronger-polarization and non-equilibrium growth, the efficiency-droop effect has been a critical obstacle to improve the quantum efficiency of III-nitride short-wavelength LEDs under high current density. Quantum-Combined Stark Effect induced by built-in electric field existed within the active region of LEDs plays a key role to reduce the quantum efficiency and causes a redshift of luminous wavelength subsequently. In this study, the light output power, bandgap diagrams, radiative recombination efficiencies, carries concentrations, spontaneous emission properties and electrical properties of InGaN/AlGaN violet LEDs with different polarities (c-plane, m-plane and r-plane) at high current density of 600 A/m are investigated using APSYS software. Conclusions indicate that all the parameters of luminescence properties and electrical properties have strong dependence on the high current density of 600 A/m, which is contributive to eliminate the quantum-confined Stark effect and enhance the luminescence efficiency of polarity short-wavelength LEDs. The results of this paper provide theoretical bases for further optimizing and designing the active region and enhancing the luminous efficiency of short-wavelength LEDs.


LED, Polarization effect, Efficiency-droop effect, Non-polarity.


WANG DANGHUI, HAN YE, XU TIANHAN, ZHANG YANG, Numerical investigation on quantum-confined stark effect and polarization effect of short-wavelength LEDs, Optoelectronics and Advanced Materials - Rapid Communications, 17, 1-2, January-February 2023, pp.21-27 (2023).

Submitted at: March 21, 2022

Accepted at: Feb. 6, 2023