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Issue 40, 2017
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Enhancing light coupling and emission efficiencies of AlGaN thin film and AlGaN/GaN multiple quantum wells with periodicity-wavelength matched nanostructure array

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Abstract

Poor light extraction efficiency (LEE) has been one of the major challenges responsible for the low external quantum efficiency of AlGaN-based ultraviolet light emitting Diodes (UV-LEDs). In this study, AlGaN nanostructure arrays were fabricated using a large-scale nanosphere self-assembly technique followed by reactive ion etching, and the transmission property of the AlGaN thin film and the photoluminescence (PL) behavior of AlGaN/GaN multiple-quantum-wells (MQWs) were investigated. A 90% light transmission value was obtained for the AlGaN thin film and a 2.5-fold increase in the band edge luminescence of the MQWs were obtained with an optimized nanostructure periodicity. Essentially, a general rule of periodicity-MQW emission wavelength matching criteria-was provided. Both the light transmission properties of the Al0.55Ga0.45N/AlN/sapphire thin film and the photoluminescence (PL) behavior of the AlGaN/GaN MQWs contribute to an improved understanding of the light extraction mechanism of PhC patterned UV-LEDs. Raman spectra also demonstrated the strain relaxation inside the MQW after nanostructure fabrication and thermal annealing. This study provides a pathway towards higher efficiency UV-LEDs with the help of a periodicity-wavelength matched nanostructure array.

Graphical abstract: Enhancing light coupling and emission efficiencies of AlGaN thin film and AlGaN/GaN multiple quantum wells with periodicity-wavelength matched nanostructure array

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Publication details

The article was received on 16 Jun 2017, accepted on 19 Sep 2017 and first published on 21 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR04341D
Citation: Nanoscale, 2017,9, 15477-15483
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    Enhancing light coupling and emission efficiencies of AlGaN thin film and AlGaN/GaN multiple quantum wells with periodicity-wavelength matched nanostructure array

    W. Guo, Z. Yang, J. Li, X. Yang, Y. Zhang, J. Wang, K. W. A. Chee, P. Gao and J. Ye, Nanoscale, 2017, 9, 15477
    DOI: 10.1039/C7NR04341D

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