| 摘要 |
PURPOSE:To improve service life and heat resistance by using as an EL layer material or a charge implantation layer material, a polymer thin film of specified film thickness having at least one of EL, charge transport and charge implantation functions. CONSTITUTION:As a material of the EL layer of an organic thin film EL element or a polymer thin film serving as a charge transport layer, polyimide and the like is used which is obtained by reacting, as a heat resistive polymer forming monomer source, acid dianhydride with a diamino compound by the vapor polymerization method to form polyamic acid (perimide precursor). The thickness of EL layer or charge transport thin film shall be 0.5mum or less. If it is at 0.5mum or more, the brightness is remarkably reduced. It is thus possible to improve the service life and heat resistance.
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