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

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