| Summary: | 碩士 === 國立臺灣海洋大學 === 光電科學研究所 === 96 === The external quantum efficiency of the organic light-emitting diodes (OLEDs) is influenced by high refracting rate materials in organic layer and ITO glass substrate, etc. How improve the devices coupling-out efficiency is an important issue to study first field that pay much attention in the group.
In this thesis, through metallic high scattering characteristics, we utilize monolayer of gold nanoparticles as a scattering medium and evaporate nanoparticles in organic layer or deposited on ITO glass, and make the detailed discussion on external quantum efficiency of devices.
The alternative to enhance the extraction is to fabricate gold/silver nano-islands with the dewetting process. As the main part of the research topic, this technology has two advantages: (1) The metallic nanostructures do not increase the fabrication cost (2) It is apt to produce on the structure large-scale devices. Because of these two strengths, the nanostructures are distinguished from the pattern fabricated with the electron beam lithography.
We succeed in utilizing metal thin film dewetting technology, and achieve optimum of gold/silver dewetting thickness as the best scattering medium. With metallic nanostructures in peripheral area of emitting region on the ITO glass substrate, external quantum efficiency of devices enhances by about 13.6 %. In addition, fabricating metallic structures on the reverse side of ITO glass substrate can prevent leak current and transmission issue, quantum efficiency can improve about 25 %.
|
|---|
