| 摘要 |
A transparent conductive film for use in organic EL devices, etc.; and a transparent conductive base material utilizing the same. Tin-doped indium oxide films among transparent conductive films are called ITO films and used in various devices. In organic EL devices consisting fundamentally of a laminate of positive electrode/luminescent layer/negative electrode, tin-doped indium oxide films are used as a transparent positive electrode disposed on a substrate, such as a glass plate. Although the work function of the positive electrode is preferably 5.0 eV or greater, the work function of ITO film has generally been about 4.4 eV. Thus, there has been a problem that the work function thereof is not satisfactory for use as the positive electrode of organic EL devices. This problem can be solved by, for example, transparent conductive film (1) comprising at least two laminated transparent conductive thin films (10,20) wherein the uppermost transparent conductive thin film is an amorphous oxide thin film composed of gallium, indium and oxygen, the gallium contained in an amount of 49.1 to 65 atomic% based on all the metal atoms, which transparent conductive film (1) exhibits a work function of 5.1 eV or greater and a surface resistance of 100 ohm/□ or below. |
