| 초록 |
Semitransparent cathode of TEOLED (Top Emission Organic Light Emitting Devices) is known to be directly related to optical and electrical properties of TEOLED because of the TEOLED characteristics that the generated light is emitted through the top cathode. For improved device property, low work function and high transmittance of top cathode are essential. Ca is a low work function metal (2.9eV) and relatively higher transmittance compared with Ag, Al. But additional protecting layer is required because Ca is very reactive metal. In this research, multi-layer structures of Ca base cathode are tested for semitransparent top cathode. Relatively stable metals such as Ag, Al and inorganic material layers are applied as protecting cathode. And optical and electrical properties of cathode structure are investigated by using transmittance measurement and analyzing I-V characteristics of TEOLED. |
