Spatial inhomogeneity investigation of QW emission in InGaN MQW LEDs

R. Xia; I. Harrison; E. C. Larkins; A. V. Andrianov; S. R.A. Dods; J. Morgan; P. J. Parbrook; C. C. Button; G. Hill

doi:10.1016/S0921-5107(02)00023-5

Spatial inhomogeneity investigation of QW emission in InGaN MQW LEDs

R. Xia
, I. Harrison
, E. C. Larkins
, A. V. Andrianov
, S. R.A. Dods
, J. Morgan
, P. J. Parbrook
, C. C. Button
, G. Hill

Research output: Contribution to journal › Article › peer-review

Abstract

The luminescence properties of InGaN multiquantum well (MQW) light emitting diodes (LEDs) with various emission wavelengths were investigated using electroluminescence (EL) microscopy (ELM) and micro-EL (μ-EL) spectroscopy. Spatial inhomogeneity of the QW emission was observed as a function of the emission wavelength in spectrally resolved ELM images. The results show that the emission from diodes with shorter emission wavelengths exhibit less spatial inhomogeneity, while bright features were observed on the surface of samples with longer emission wavelengths. μ-EL spectra obtained from 5 × 5 μm² regions show an increase in the full width at half maximum (FWHM) of the spectra with increasing injection current and emission wavelength. With increasing emission wavelength, there is a shift in the main emission area from the p-contact area to the n-contact. The μ-EL spectra obtained from different bright spots in the ELM images demonstrate the variation of main emission peak position and FWHM of the EL spectra. The results suggest that the band-tailing effect due to small self-organised In-rich regions play a key role in the emission of the InGaN MQWs.

Original language	English
Pages (from-to)	234-238
Number of pages	5
Journal	Materials Science and Engineering: B
Volume	93
Issue number	1-3
DOIs	https://doi.org/10.1016/S0921-5107(02)00023-5
Publication status	Published - 30 May 2002
Externally published	Yes

Keywords

Electroluminescence microscopy
InGaN
LEDs
Micro-EL
MQW

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10.1016/S0921-5107(02)00023-5

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@article{a97b7dd47e14493d88b4db0e56907ecc,

title = "Spatial inhomogeneity investigation of QW emission in InGaN MQW LEDs",

abstract = "The luminescence properties of InGaN multiquantum well (MQW) light emitting diodes (LEDs) with various emission wavelengths were investigated using electroluminescence (EL) microscopy (ELM) and micro-EL (μ-EL) spectroscopy. Spatial inhomogeneity of the QW emission was observed as a function of the emission wavelength in spectrally resolved ELM images. The results show that the emission from diodes with shorter emission wavelengths exhibit less spatial inhomogeneity, while bright features were observed on the surface of samples with longer emission wavelengths. μ-EL spectra obtained from 5 × 5 μm2 regions show an increase in the full width at half maximum (FWHM) of the spectra with increasing injection current and emission wavelength. With increasing emission wavelength, there is a shift in the main emission area from the p-contact area to the n-contact. The μ-EL spectra obtained from different bright spots in the ELM images demonstrate the variation of main emission peak position and FWHM of the EL spectra. The results suggest that the band-tailing effect due to small self-organised In-rich regions play a key role in the emission of the InGaN MQWs.",

keywords = "Electroluminescence microscopy, InGaN, LEDs, Micro-EL, MQW",

author = "R. Xia and I. Harrison and Larkins, \{E. C.\} and Andrianov, \{A. V.\} and Dods, \{S. R.A.\} and J. Morgan and Parbrook, \{P. J.\} and Button, \{C. C.\} and G. Hill",

year = "2002",

month = may,

day = "30",

doi = "10.1016/S0921-5107(02)00023-5",

language = "English",

volume = "93",

pages = "234--238",

journal = "Materials Science and Engineering: B",

issn = "0921-5107",

publisher = "Elsevier Ltd",

number = "1-3",

}

TY - JOUR

T1 - Spatial inhomogeneity investigation of QW emission in InGaN MQW LEDs

AU - Xia, R.

AU - Harrison, I.

AU - Larkins, E. C.

AU - Andrianov, A. V.

AU - Dods, S. R.A.

AU - Morgan, J.

AU - Parbrook, P. J.

AU - Button, C. C.

AU - Hill, G.

PY - 2002/5/30

Y1 - 2002/5/30

N2 - The luminescence properties of InGaN multiquantum well (MQW) light emitting diodes (LEDs) with various emission wavelengths were investigated using electroluminescence (EL) microscopy (ELM) and micro-EL (μ-EL) spectroscopy. Spatial inhomogeneity of the QW emission was observed as a function of the emission wavelength in spectrally resolved ELM images. The results show that the emission from diodes with shorter emission wavelengths exhibit less spatial inhomogeneity, while bright features were observed on the surface of samples with longer emission wavelengths. μ-EL spectra obtained from 5 × 5 μm2 regions show an increase in the full width at half maximum (FWHM) of the spectra with increasing injection current and emission wavelength. With increasing emission wavelength, there is a shift in the main emission area from the p-contact area to the n-contact. The μ-EL spectra obtained from different bright spots in the ELM images demonstrate the variation of main emission peak position and FWHM of the EL spectra. The results suggest that the band-tailing effect due to small self-organised In-rich regions play a key role in the emission of the InGaN MQWs.

AB - The luminescence properties of InGaN multiquantum well (MQW) light emitting diodes (LEDs) with various emission wavelengths were investigated using electroluminescence (EL) microscopy (ELM) and micro-EL (μ-EL) spectroscopy. Spatial inhomogeneity of the QW emission was observed as a function of the emission wavelength in spectrally resolved ELM images. The results show that the emission from diodes with shorter emission wavelengths exhibit less spatial inhomogeneity, while bright features were observed on the surface of samples with longer emission wavelengths. μ-EL spectra obtained from 5 × 5 μm2 regions show an increase in the full width at half maximum (FWHM) of the spectra with increasing injection current and emission wavelength. With increasing emission wavelength, there is a shift in the main emission area from the p-contact area to the n-contact. The μ-EL spectra obtained from different bright spots in the ELM images demonstrate the variation of main emission peak position and FWHM of the EL spectra. The results suggest that the band-tailing effect due to small self-organised In-rich regions play a key role in the emission of the InGaN MQWs.

KW - Electroluminescence microscopy

KW - InGaN

KW - LEDs

KW - Micro-EL

KW - MQW

UR - https://www.scopus.com/pages/publications/0037198534

U2 - 10.1016/S0921-5107(02)00023-5

DO - 10.1016/S0921-5107(02)00023-5

M3 - Article

AN - SCOPUS:0037198534

SN - 0921-5107

VL - 93

SP - 234

EP - 238

JO - Materials Science and Engineering: B

JF - Materials Science and Engineering: B

IS - 1-3

ER -

Spatial inhomogeneity investigation of QW emission in InGaN MQW LEDs

Abstract

Keywords

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