2,5-双〔4-(N,N-二苯基)氨基苯基〕吡啶的合成及光谱性质

三芳胺是传统的空穴传输材料,该文将其引入磷光配体2-苯基吡啶中,得到一种具有双重性质的磷光配体2,5-双〔4-(N,N-二苯基)氨基苯基〕吡啶,并通过元素分析,核磁共振氢谱对其结构进行了确认。通过比较其与另外两种磷光配体在二氯甲烷中的紫外吸收光谱和光致发光光谱表明,由于二苯胺这样一个强供电子性基团的引入,增强了π电子的离域范围,降低了这种磷光配体的HOMO轨道和LUMO轨道之间的能壑,使其最大吸收峰波长红移99 nm,最大发射峰波长红移48 nm,且吸收和发射的强度增加,Stokes位移为72 nm。

Synthesis of 2,5-Bis[4-(N,N-diphenyl)aminophenyl]pyridine and Its Photoluminescent Properties

A novel diphenylamino substituted 2-phenylpyridine derivative was synthesized,with its structure confirmed by elementary analysis and 1HNMR.In order to investigate its photoluminescent properties,the emission and absorption spectroscopies of three phosphorescent ligands in dichloromethane were studied.Electron-donating diphenylamino group is often used as the unit of hole transporting materials.When this group is introduced into 2-phenylpyridine,the π-conjugation on the flexible frameworks enhances the electron donation to the 2-phenylpyridine chelates,and the band gap between the HOMO and LUMO energy levels is strongly decreased.So the red shift is attributed to the resonance effect of the diphenylamino substituent.The max absorbance plays a red shift of 99 nm,and the max emittance plays a red shift of 48 nm and Stokes shift of 72 nm.