COMPOSITE SUBSTRATE AND EL DEVICE COMPRISING THE SAME

摘要

The invention aims to provide a method for preparing a composite substrate of substrate/electrode/dielectric layer structure having a thick-film dielectric layer with a smooth surface using a sol-gel solution of high concentration capable of forming a film to a substantial thickness without generating cracks, the composite substrate and an EL device using the same. The object is attained by a method for preparing a composite substrate including in order an electrically insulating substrate, an electrode and an insulator layer formed thereon by a thick film technique, wherein a thin-film insulator layer is formed on the insulator layer by applying to the insulator layer a sol-gel solution obtained by dissolving a metal compound in a diol represented by OH(CH2)nOH as a solvent, followed by drying and firing; the composite substrate and an EL device using the same. <IMAGE>