Electroluminescence hyperspectral imaging of light-emitting diodes using a liquid crystal tunable filter

Paul R. Edwards; Jochen Bruckbauer; Douglas Cameron; Robert W. Martin

doi:10.1063/5.0165060

Electroluminescence hyperspectral imaging of light-emitting diodes using a liquid crystal tunable filter

Paul R. Edwards, Jochen Bruckbauer, Douglas Cameron, Robert W. Martin

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

1 Citation (Scopus)

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Abstract

We demonstrate the use of a low-cost liquid-crystal-based wavelength-tunable filter and CMOS video camera to add hyperspectral imaging capabilities to a probe station equipped with a simple optical microscope. The resultant setup is used to rapidly resolve the spectral and spatial variations in electroluminescence typically observed for In_xGa_1−xN/GaN light-emitting diodes. Applying standard statistical analyses of variation within the multivariate datasets, such as moments and principal components, we observe inhomogeneities on a spectral scale significantly smaller than the bandwidth of the tunable filter. The resultant tool offers an alternative to scanning beam luminescence techniques for high-throughput hyperspectral analysis of optoelectronic devices.

Original language	English
Article number	112110
Number of pages	6
Journal	Applied Physics Letters
Volume	123
Issue number	11
DOIs	https://doi.org/10.1063/5.0165060
Publication status	Published - 15 Sept 2023

Funding

We thank Professor D. J. Wallis (Plessey Semiconductors Ltd., now at Cardiff University) for LED samples and Dr. J. J. D. McKendry and Professor M. D. Dawson (Institute of Photonics, University of Strathclyde) for the µLEDs. This work was supported by the UK EPSRC through Grant Nos. EP/P02744X/1, EP/P02744X/2, and EP/R03480X/1.

Keywords

hyperspectral imaging
light-emitting diodes
liquid crystal tunable filter

Access to Document

10.1063/5.0165060Licence: CC BY 4.0

Edwards-etal-APL-2023-Electroluminescence-hyperspectral-imaging-of-light-emitting-diodesFinal published version, 3.55 MBLicence: CC BY 4.0

'Hetero-print': A holistic approach to transfer-printing for heterogeneous integration in manufacturing
Dawson, M. (Principal Investigator), Martin, R. (Co-investigator), Strain, M. (Co-investigator), Watson, I. (Co-investigator) & Guilhabert, B. J. E. (Research Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/06/18 → 31/05/24
Project: Research
Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devices
Martin, R. (Principal Investigator), Dawson, M. (Co-investigator), Edwards, P. (Co-investigator), Skabara, P. (Co-investigator) & Watson, I. (Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/07/17 → 31/07/22
Project: Research

Electroluminescence hyperspectral images of light-emitting diodes
Edwards, P. (Creator), Bruckbauer, J. (Creator), Cameron, D. (Creator) & Martin, R. (Creator), University of Strathclyde, 4 Sept 2023
DOI: 10.15129/1d98de3e-6e96-418e-a782-4bfe464dd748
Dataset

Cite this

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title = "Electroluminescence hyperspectral imaging of light-emitting diodes using a liquid crystal tunable filter",

abstract = "We demonstrate the use of a low-cost liquid-crystal-based wavelength-tunable filter and CMOS video camera to add hyperspectral imaging capabilities to a probe station equipped with a simple optical microscope. The resultant setup is used to rapidly resolve the spectral and spatial variations in electroluminescence typically observed for InxGa1−xN/GaN light-emitting diodes. Applying standard statistical analyses of variation within the multivariate datasets, such as moments and principal components, we observe inhomogeneities on a spectral scale significantly smaller than the bandwidth of the tunable filter. The resultant tool offers an alternative to scanning beam luminescence techniques for high-throughput hyperspectral analysis of optoelectronic devices.",

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AB - We demonstrate the use of a low-cost liquid-crystal-based wavelength-tunable filter and CMOS video camera to add hyperspectral imaging capabilities to a probe station equipped with a simple optical microscope. The resultant setup is used to rapidly resolve the spectral and spatial variations in electroluminescence typically observed for InxGa1−xN/GaN light-emitting diodes. Applying standard statistical analyses of variation within the multivariate datasets, such as moments and principal components, we observe inhomogeneities on a spectral scale significantly smaller than the bandwidth of the tunable filter. The resultant tool offers an alternative to scanning beam luminescence techniques for high-throughput hyperspectral analysis of optoelectronic devices.

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KW - light-emitting diodes

KW - liquid crystal tunable filter

U2 - 10.1063/5.0165060

DO - 10.1063/5.0165060

M3 - Article

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VL - 123

JO - Applied Physics Letters

JF - Applied Physics Letters

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Electroluminescence hyperspectral imaging of light-emitting diodes using a liquid crystal tunable filter

Abstract

Funding

Keywords

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Projects

'Hetero-print': A holistic approach to transfer-printing for heterogeneous integration in manufacturing

Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devices

Datasets

Electroluminescence hyperspectral images of light-emitting diodes

Cite this