ABSTRACT This study designs, fabricates, and evaluates both conventional AC‐dispersive inorganic electroluminescent (EL) devices and novel planar electrode‐type EL devices. The devices utilize a copper‐ and chlorine‐doped zinc sulfide (ZnS:Cu,Cl) luminescent layer and comb‐shaped electrode structures made of ITO, Au, and Pt. The influences of the electrode material conductivity and transparency on the luminescence characteristics and brightness were systematically investigated through comprehensive electrical characterization including impedance analysis, I–V characteristics, and voltage retention measurements. Optical pathway differences between device architectures were analyzed, considering light extraction efficiency and surface plasmon effects. Basic electromagnetic field simulations were performed to visualize field patterns. We discovered that the luminescence characteristics and brightness of the devices were primarily affected by the transparency of the comb electrodes rather than by the conductivity of the electrode materials. The absence of a dielectric layer in comb‐electrode devices resulted in reduced brightness due to limited charge accumulation and optical losses. This research provides valuable insights into inorganic EL device design and evaluation methodologies.
Tsuruta et al. (Mon,) studied this question.