| 초록 |
High performance polymer light-emitting diodes (PLEDs) have been demonstrated by introducing an innovative conjugated polyelectrolyte, poly[9,9-bis(4’-sulfonatobutyl) fluorene-alt-co-1,4-phenylene) (PFP-Na). By controlling the degree of doping concentration, PFP-Na layer functions as an electron transport layer (ETL) and a hole transport layer (HTL) selectively. The PLED with a pristine PFP-Na as an ETL exhibits an improved performance compared with conventional PLED without PFP-Na (ITO/PEDOT:PSS /MEH-PPV/Al). In addition, PLED with p-type doped PFP-Na as a HTL shows better efficiency by ~2 times than conventional PLED. The p-type doped PFP-Na (p-PFP-Na) could be obtained by self-oxidizing the polymer backbones using hydrogen peroxide (H2O2). Since PFP-Na is water-based and non-acidic, device lifetime for both are significantly extended. |
