| Organic photoelectronic materials have become a study hotspot in flat panel display and illuminance fileds.In this technology the design and synthesis of materials are core,studies on their physical properties in relation to organic photoelectronic materials are keys.In this paper,two Benzimidazole-based zinc complexes as photoelectronic materials were mainly synthesized.Their physical properties in relation to organic photoelectronic were investigated in details.The developments obtained in designs of materials structure and optical properties are as fellows:1.Two Benzimidazole-based zinc complexes,2,6-bis(benzimidazol-2-yl) pyridine-zinc acetate(Zn(bbp)(OOCCH3)2)and Bis-2-(2-hydroxyphenyl) benzimidazole zinc(Zn(pbm)2)with high purity,were synthesized by liquid-phase reaction and purified by vacuum sublimation,molecular structures were confirmed by element analysis,1H NMR spectra and FT-IR spectra;their thermal stabilities were characterized by TG-DTG curves;phase structures were analyzed by X-ray diffraction(XRD);their film-forming abilities were identified by atomic force microscope(AFM).Experimental results showe that:①Zn(bbp)(OOCCH3)2 was a polycrystalline material, with decomposition temperature being 429℃;②Zn(pbm)2 was a sheet polycrystalline material,with preliminary decomposition temperature being 404℃.2.Zn(bbp)(OOCCH3)2 and Zn(pbm)2's luminescent properties were studied by UV absorption spectra and fluorescence spectra.In addition,the structures of energy band,photophysical and photochemical properties of those were studied by cyclic voltammetry,UV absorption spectra and fluorescence spectra in details.The results showe that:①Zn(bbp) (OOCCH3)2 in N,N-dimethylfomamide emitted intensive blue fluorescence at peak wavelength of 458 nm under UV excitation and had high quantum fluorescence yield;HOMO level,LUMO level and optical gap of Zn(bbp)(OOCCH3)2 were -6.025eV,-3.087eV and 2.938eV,respectively.②Zn(pbm)2 powder emitted blue fluorescence,the maximum emission peak was at 411nm,and it's HOMO level,LUMO level and optical gap were -5.72eV,-2.69eV and 3.03eV,respectively.3.Single-layer device ITO/Zn(pbm)2/Al,with Zn(pbm)2 as the emissive layer,was fabricated to realize blue light.4.Besides,other five Benzimidazole-based organic metal complexes were synthesized and their fluorescence emission spectra were compared with those of Zn(bbp)(OOCCH3)2 and Zn(pbm)2 to explore their luminous mechanisms.
|
PDF Full Text Request