The purpose of this study is to develop a planar field electron emission source that can be driven stably for a long time with low energy consumption and output power control to realize field-emission–cathodoluminescence (CL) devices with excellent energy efficiency. This was achieved driven by the motivation that the use of CLs with excellent quantum efficiency can create new values for society by realizing energy-saving lighting. We attempted to prepare dispersion coatings of highly crystalline single-walled carbon nanotubes (hc-SWCNTs) with guaranteed chemical stability by an industrial dispersion process. The change in chemical stability owing to the adoption of the dispersion process was traced by quantifying the shape of the thermogravimetric analysis (TGA) curve, and the process suitable for the dispersion of hc-SWCNTs was investigated. As a result, it was shown that the wet jet mill dispersion process could be combined to achieve dispersion with slightly deteriorated chemical stability. This was achieved by reducing the milling effect of foreign matter and by controlling the shear force and the number of shear cycles applied to the dispersion.