2-(2-羟基苯基)苯并咪唑锌的合成及其光谱性能研究

Synthesis and photoluminescent properties of bis-2-(2-hydroxyphenyl)benzimidazole zinc

合成了一种纯蓝的发光材料2-(2-羟基苯基)苯并咪唑锌(Zn(pbm)2),用元素分析、核磁共振、红外光谱、紫外-可见光吸收光谱、循环伏安曲线、原子力显微镜以及光致发光光谱、热重等表征了材料的结构、光学带隙、能带结构、成膜性能、发光性能以及热稳定性。实验结果表明,配合物具有较好的热稳定性;在DMSO溶液中Zn(pbm)2的紫外吸收峰波长为299、334、357nm;光学带隙为3.03eV。利用真空热蒸镀法可以得到均匀致密的Zn(pbm)2薄膜,其粗糙度为7.05nm。在365nm紫外光的激发下,产生发光峰在445nm附近,半高宽(FWHM)为81nm的纯蓝光发射。

A pure blue light emitting material bis-2-（2-hydroxyphenyl）benzimidazole zinc has been synthesized. Its structure, energy band, photoluminescent property, film-forming ability, and thermal properties were charaterized by elemental analysis, ^1H-NMR, IR, UV-vis absorption, cyclic voltammetry, photoluminescent spectra, atomic force microscopy, and TG-DTG technique. The results show that the complex had a good thermal stability. UV-vis absorption bands of Zn（pbm）2 were located at about 299, 334, 357. Its optical gap, HO- MO energy and LUMO energy were 3.03, -5.72 and -2.69eV, respectively. Zn（pbm）2 formed dense film by vacuum vapor deposition. The maximum emitting wavelength of Zn（pbm）2 was 445nm, with FWHM being 81nm and color purity being 0. 8599, which indicates that this complex is an excellent blue-emitting material. The complexe was expected to find applications in organic electroluminesence diodes through appropriate device design.