| 초록 |
We synthesized spirobifluorene-based copolymers, poly[{3',6'-bis(3,7-dimethyloctyloxy)-9,9'-spirobifluorenyl-2,7-vinylene)}-co-2-{methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene}]s [(RO)2-Spiro-PFV-co-MEH-PPVs], with various ratios of 2,7-bis(chloromethyl)-3',6'-bis(3,7-dimethyloctyloxy)-9,9'-spirobifluorene and 1,4-bis(chloromethyl)-2-(2'-ethylhexyloxy)-5-methoxybenzene through the Gilch polymerization method. The introduction of spirobifluorene units into the PPV backbone reduced interchain interactions and improved thermal stability. The resulting polymers had high molecular weight and were completely soluble in common organic solvents such as chloroform, THF, chlorobenzene, 1,2-dichlorobenzene. We could easily make a good films with (RO)2 -Spiro-PFV-co-MEH-PPVs by spin-coating. To study the performance of EL devices using these polymers as an emitter, the devices were made by sandwiching these polymers between indium tin oxide/poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (ITO/PEDOT:PSS) and Alq3/LiF/Al or LiF/Al. To investigate photovoltaic properties, bulk heterojunction solar cells were made from the active mixture that consisted of (RO)2-Spiro-PFV-co-MEH-PPVs as electron donors and [6,6]-Ph C61-butyric acid Me ester [PCBM] as an electron acceptor. |
