| 초록 |
The conjugated polymers containing Selenium have been attracting much attention in light emitting diode (LED) and field effect transistor (FET). We have synthesized a new soluble conjugated copolymer derived from 9, 9’-dioctylfluorene (DOF) and 2, 2’-biselenophene by a palladium-catalyzed Suzuki coupling reaction. The synthesized polymer was characterized by 1H NMR, UV-vis spectroscopy, PL, TGA, GPC and DSC. In the solid film, the UV absorption maximum appeared at 486 and 517nm, and the PL emission maximum appeared at 540, 578, 623 nm. EL device was fabricated in the ITO/PEDOT/polymer/Ca/Al configuration and characterized as a function of applied voltage. A significant red shift of the emission of Se-containing copolymer in comparison with its sulfur analogue, poly(9,9'-dioctylfluorene-alt-biselenophene), is related to the stronger chain interaction between selenophene neighboring copolymer chains. Also, Solution-processed TFT of F8Se2 was fabricated using bottom-contact geometry. The TFT of F8Se2 showed the typical p-channel field effect transistor (FET) characteristics. Detailed synthesis and characterization will be presented.
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