Study of insulator on thick dielectric electroluminescent

With screen-printing technique, a ceramic thick film substrate was fabricated by printing and sintering Ag/Pt alloy internal electrodes and high dielectric constant ceramic thick film insulating layer on Al₂2O₃ ceramic substrate. Thereby a novel thick dielectric electroluminescent(TDEL)device was prepared by using the ceramic thick film substrate. The whole structure of the device is ceramic substrate/internal electrodes/thick dielectric film/light-emitting layer/thin dielectric film/ITO. The article studies the influence of different structure on TDEL. The dependence of brightness on voltage and frequency were measured, respectively. The results show that insulator not only protect the ZnS: Mn layer, but also improve the performance of TDEL. Insulator can accelerate electron before inject into ZnS: Mn layer. The dielectric layer doesn't influence the electroluminescent mechanism of TDEL.