| 摘要 |
<p>An improved thin-film EL element that exhibits electroluminescence in response to the application of an electric field, that maintains high brightness over a long period, and that exhibits improved brightness in blue display. A light-emitting layer (4) is made of a sulfide of an alkaline earth metal as the base material, and insulating layers (3) and (5) in contact with the light-emitting layer (4) are made of a sulfate or a carbonate of an alkaline earth metal. Further, the light-emitting layer (4) contains Ce as luminescence center in the base material of SrS and is doped with Pb as a coactivator.</p> |
