| 초록 |
The two new compounds S1 and S2, with N-atom as linker containing phenylcarbazole and fluorenyl group as main core and SBF and SBFN end cappers were designed and synthesized for blue fluorescent organic light emitting diodes (FOLEDs). The introduction of SBF has render to achieve high thermal stability and this could suppress the intermolecular interactions. Their photophysical, thermal and electrochemical properties of the material were systematically investigated by UV-visible absorption, photoluminescence (PL), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and cyclic voltammetry (CV). The two compounds display blue emission in solution and solid state. Especially, S1 exhibit deep blue emission (441 nm) with an excellent color purity (y≤ 0.10). Solution-processed devices based on these materials exhibit high efficient and stable deep blue electro luminescence. The blue Fluorescent OLEDs were fabricated with the configuration of ITO/PEDOT:PSS/emitter/TPBI/LiF/Al. The optimized fluorescent OLEDs showed impressive device performance with maximum luminance efficiency of 3.0 cd/A, maximum power efficiency of 1.5 lm/W and maximum external quantum efficiency of 2.0% with CIE coordinate of (0.14, 0.19) at 3.1 V driving voltage. |
