烷氧基取代8-羟基喹啉铝锌配合物的合成及其发光与液晶性质

Synthesis of Alkyl-substituted 8-Hydroxyl Quinoline Metal Complex and Its Properties of Luminescence and Liquid Crystal

8-羟基喹啉铝(Alq3)是目前最有效的有机电致发光材料之一.但是Alq3难溶,一般通过真空蒸镀制作器件,成本高.将其掺杂在高分子基质制作的器件因器件发热发生聚集结晶而导致其稳定性下降.为了克服这些不足,合成了8种烷氧基取代的8-羟基喹啉的Al(Ⅲ)和Zn(Ⅱ)配合物, 其结构经红外、紫外、核磁共振及元素分析确证.测定了配合物的光致发光光谱,证实其具有良好的光致发光性能.并通过DSC、TGA和偏光显微镜考察了热力学及液晶性质,Tm为341～269 ℃,Tg为158.3～119.6 ℃,4个Zn(Ⅱ)配合物均有液晶性.证实随柔性侧链链长的增长,其玻璃化温度及熔点均有不同程度的降低.研究了一种Al(Ⅲ)配合物的电致发光性质,在28.6 V的驱动电压下得到最高亮度为27 cd/m2.

8-Hydroxylquinoline aluminium （Alq3） is one of the best electroluminescent materials with good electrontransporting ability. Due to its poor solubility, Alq3 is used in OELD by vacuum evaporation mostly and easily recrystallizes from the OELD, leading to the OELD＇s stability decreased. To overcome the defects of Alq3, a series of alkoxyl-substituted 8-Hydroxylquinoline metal complex were designed and synthesized. Their chemical structures were determined by FTIR, ^1H NMR and elementary analysis. These derivatives of Alq3 showed the good solubihty in common solvent. Their photoluminescence （PL） and thermodynamic proeperties as well as textures of liquid crystals was studied. Tm were 341～269℃, Tg were 158.3～119.6℃. The all Zn（Ⅱ） complexes had the liquid crystal properties, and showed that the glass transition temperature（Tg） and the melt temperature descend with the longer side chain. The electroluminescence （EL） properties of Alq-1 was also studied. The results showed that the highest EL brightness of the device reachs 27 cd/m^2 at the voltage of 28.6 V.