Designs, Synthesis And Performances Research Of Novel Organic Light-Emitting Materials Base On Carbazole

Organic light-emitting device (OLED) can be used to produce a new generation of large-area flatpanel displays and semiconductor solid lighting for its spontaneous emission, fast response and highbrightness. OLED materials are keys of the devices, and have drawn much attention all over theworld.In the paper, a series of2-(2-hydroxyphenyl)benzothiazole and Poly-salen ligands andcorresponding zinc(II)-chelate complexes were successfully synthesized, which have these properties,arising from the combination of both the metal complex (opto-electronic) and the polymer(processability, mechanical strength, thin film formation, ect.). The chemical structure, luminescenceproperties, electrochemical properties and thermal stability of the complexes were characterized by1HNMR,13C NMR spectra, IR spectra, UV-Vis absorption spectra, fluorescence spectra, cyclicvoltammetry and thermogravimetric analysis (TGA) measurements.The experimental results indicate:1. The2-(2-hydroxyphenyl)benzothiazole, poly-salen ligands and their zinc(II) complexes hadfeaturable absorption at the wavelength between200~350nm, coordinated with metal leading to thefeaturable absorption peak’s red-shift.2. The2-(2-hydroxyphenyl)benzothiazole, poly-salen ligands and their zinc(II) complexes hadfeaturable emission at the the wavelength between420~550nm, coordinated with metal leading to thefeaturable emission peak’s blue-shift.3. The fluorescence quantum yields of the2-(2-hydroxyphenyl)benzothiazole and Poly-salenligands and zinc(II) complexes were between83.6%~89.3%,56.3%~71.6%respectively.4. Cyclic voltammetry revealed that EHOMOand ELUMOof the2-(2-hydroxyphenyl)benzothiazolecomplexes were-5.07~-5.03eV,-2.33~-2.07eV; the EHOMOand ELUMOof the Poly-salen-zinc(II)complexes were-5.46~-4.98eV,-2.77~-1.68eV.5. The thermogravitometric analysis showed that the decomposition temperature of metal-chelatecomplexes were ranging from400~450℃.In summary, the metal-chelate complexes based on carbazole have excellent thermal stabilityand appropriate energy band gap, which may be a promising type of OLEDmaterials...