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

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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 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.
Original languageEnglish
Article number112110
Number of pages6
JournalApplied Physics Letters
Volume123
Issue number11
DOIs
Publication statusPublished - 15 Sept 2023

Keywords

  • hyperspectral imaging
  • light-emitting diodes
  • liquid crystal tunable filter

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