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

Edwards, Paul R. and Bruckbauer, Jochen and Cameron, Douglas and Martin, Robert W. (2023) Electroluminescence hyperspectral imaging of light-emitting diodes using a liquid crystal tunable filter. Applied Physics Letters, 123 (11). 112110. ISSN 0003-6951 (https://doi.org/10.1063/5.0165060)

[thumbnail of Edwards-etal-APL-2023-Electroluminescence-hyperspectral-imaging-of-light-emitting-diodes]
Preview
 Text. Filename: Edwards_etal_APL_2023_Electroluminescence_hyperspectral_imaging_of_light_emitting_diodes.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo
Download (3MB)| Preview

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.

CORE (COnnecting REpositories)