Polyimide as a Plastic Substrate for the Flexible Organic Electroluminescent Device

Abstract

In this work, transparent flexible substrates based on polyimides(PI) with indium tin oxide (ITO) thin films for organic electroluminescent devices have been prepared. 2,2'-bis-(3,4-dicarboxyphenyl) hexafluoropropanedianhydride (6FDA) and 2,2'-bis-(trifluoromethyl)-4,4'-diaminobiphenyl (TFDB) PI films were used for transparent flexible substrates. ITO thin films were prepared at two substrate deposition temperatures of 25˚C and 150˚C with a typical radiofrequency (r.f.) planar magnetron sputtering system. The sheet resistance and the optical transmission properties of the fluorinated PI substrate were comparable with those for the slide glass substrate. The substrate properties are better when the deposition temperature is higher. SiO 2 coating onto the fluorinated PI substrate by sol-gel reaction was also attempted to improve the optical transmission of the ITO/PI substrate. It was found that the coating of SiO 2 affected on the morphology of the PI substrates.

High performance organic-inorganic hybrid barrier coating for encapsulation of OLEDs

“…High performance transparent gas barrier coating materials have attracted much attention in conjunction with the use of plastic substrates enable the fabrication of the flexible displays, solar cells, and opto-devices due to their high flexibility, thermal stability, and optical transparency. [1][2][3] OLEDs are promising candidates for next generation displays. However, their organic functional layers have high sensitivity to water and oxygen.…”