无机厚膜发光器件绝缘层的研究

采用丝网印刷技术,在Al2O3陶瓷基板上印刷、高温烧结内电极及绝缘层,制备出陶瓷厚膜基板,进而制备了新型厚膜电致发光显示器(TDEL)。整个器件结构为陶瓷基板/内电极/厚膜绝缘层/发光层/薄膜绝缘层/ITO透明电极。研究不同结构的无机厚膜发光器件对器件性能的影响,并对器件的亮度—电压、亮度—频率进行测量。结果显示绝缘层在无机发光器件中不是单纯的保护作用,它对器件的性能有十分重要的影响。主要是对注入电子的加速作用,从而提高发光亮度。绝缘层本身对无机厚膜发光器件的发光机理没有关系。

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 Al2O3 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 dosen't influence the electroluminescent mechanism of TDEL.