Well and Polarization Effects on Carrier Distribution and Interband Transitions in NUV Light-Emitting Diodes

Fang Ming Chen, Yen-Kuang Kuo, Jih-Yuan Chang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The illumination efficiency and the relevant physical mechanism of near-ultraviolet (NUV) AlGaN-based light-emitting diodes (LEDs) are investigated numerically. In particular, the interrelationship of quantum well (QW) thickness and degree of polarization, and the relevant influence on the light output power of NUV LEDs are systematically studied. Simulation results indicate that the use of wider QWs with less polarization field is beneficial in suppressing the Auger recombination by reducing the carrier density. However, the structure with wider QWs suffers from severer spatial separation of electron and hole wave functions within the QW, which is more sensitive to the degree of polarization in its optical performance. To resolve this problem, the quaternary Al0.1In0.05Ga0.85N is proposed as the material of quantum barriers in wide QWs, in which the polarization mismatch between the QW and the barrier is reduced and the relevant quantum-confined Stark effect is relieved consequently.

Original languageEnglish
Article number7315023
JournalIEEE Journal of Quantum Electronics
Volume51
Issue number12
DOIs
Publication statusPublished - 2015 Dec 1

Fingerprint

ultraviolet radiation
Light emitting diodes
light emitting diodes
Polarization
Semiconductor quantum wells
quantum wells
polarization
Stark effect
Wave functions
Carrier concentration
Lighting
illumination
wave functions
Ultraviolet Rays
Electrons
output
electrons
simulation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "The illumination efficiency and the relevant physical mechanism of near-ultraviolet (NUV) AlGaN-based light-emitting diodes (LEDs) are investigated numerically. In particular, the interrelationship of quantum well (QW) thickness and degree of polarization, and the relevant influence on the light output power of NUV LEDs are systematically studied. Simulation results indicate that the use of wider QWs with less polarization field is beneficial in suppressing the Auger recombination by reducing the carrier density. However, the structure with wider QWs suffers from severer spatial separation of electron and hole wave functions within the QW, which is more sensitive to the degree of polarization in its optical performance. To resolve this problem, the quaternary Al0.1In0.05Ga0.85N is proposed as the material of quantum barriers in wide QWs, in which the polarization mismatch between the QW and the barrier is reduced and the relevant quantum-confined Stark effect is relieved consequently.",
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N2 - The illumination efficiency and the relevant physical mechanism of near-ultraviolet (NUV) AlGaN-based light-emitting diodes (LEDs) are investigated numerically. In particular, the interrelationship of quantum well (QW) thickness and degree of polarization, and the relevant influence on the light output power of NUV LEDs are systematically studied. Simulation results indicate that the use of wider QWs with less polarization field is beneficial in suppressing the Auger recombination by reducing the carrier density. However, the structure with wider QWs suffers from severer spatial separation of electron and hole wave functions within the QW, which is more sensitive to the degree of polarization in its optical performance. To resolve this problem, the quaternary Al0.1In0.05Ga0.85N is proposed as the material of quantum barriers in wide QWs, in which the polarization mismatch between the QW and the barrier is reduced and the relevant quantum-confined Stark effect is relieved consequently.

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