Study on application of carbon nanotubes for OLED packaging

• Main Authors: Yan-Syun Li, 李彥勳
• Other Authors: Wen-Tuan Wu
• Format: Others
• Language: zh-TW
• Published: 104
• Online Access: http://ndltd.ncl.edu.tw/handle/94415355312358997615

碩士 === 南臺科技大學 === 光電工程系 === 103 === A major decline in an organic light-emitting diode (OLED) device performance is caused by the water vapor and oxygen permeability, which result in the formation of black spots in OLEDs, reducing their light output and lifetimes. In this study, Multi-Walled Carbon Nanotubes (MWNTs) were synthesizedon a silicon substrate at relatively low temperature 500℃,using an Electron Cyclotron Resonance Chemical Vapor Deposition (ECR-CVD). Mixing gases of Methane (CH4) and Nitrogen (N2) were used as carbon source and the plasma treated 3-nm-thick Ni film as catalyst. The other method to fabricate Carbon Nanotubes(CNT) samples is sand blasting. UV glue is spin-coated on glass as an adhesive, and then MWNTs powder can be attached onto the glass by sand-blast technique.To enhance the surface hydrophilicity, the surface of (CNTs) is functionalized by C2H5OH treatment, oxygen plasma or UV/Ozone treatment. The surface morphologies and microstructures of carbon nanotubes are examined by scanning electron microscopy (SEM), and functionalization of carbon nanotubes are examined by the Fourier Transform Infrared Spectroscopy (FTIR) to analysis the chains.The results show that ECR-CVD grown CNTs reveal vertically aligned character and the length of CNTs is varied from 1.8 to 4.5 μm. The vertically aligned character results in a good moisture absorption property by trapping the chains of water molecules near the nanotubes surface via the pores in adjacent nanotubes. Different samples, such as CNTs/Si, CNTs/UV glue/glass and CNTs/glass are used as back plates for OLED encapsulations.The heat dispersion properties of back plates are characterized by thermal imaging camera at OLED luminance of 24,000 cd/m2.The results show that the longer CNTs have the better thermal dispersion. For different back plates, theproperties of thermal dispersion are CNTs/Si or CNTs/glass > CNTs/UV glue/glass> glass. The purpose of this study is using CNT as hygroscopic agent in OLED encapsulation to enhance hygroscopic and improve thermal dispersion.