His primary areas of investigation include Analytical chemistry, Luminescence, Phosphor, Photoluminescence and Doping. His research in Analytical chemistry intersects with topics in Ion, Pulsed laser deposition, Thin film and Scanning electron microscope. His Luminescence research is multidisciplinary, incorporating elements of Emission spectrum, Solvothermal synthesis, Crystal structure, Mineralogy and Chromaticity.

His research in Phosphor intersects with topics in Photoluminescence excitation, Excitation, Light-emitting diode and Diffraction. His Photoluminescence study integrates concerns from other disciplines, such as Excited state, Activator, Dopant, Crystallinity and Diffuse reflection. Jung Hyun Jeong has researched Doping in several fields, including Fourier transform infrared spectroscopy, Hydrothermal circulation, Differential thermal analysis, Sol-gel and Nanocrystal.