蓝色有机电致发光材料8-羟基喹啉硼化锂结构表征及其对荧光性质影响研究

Characterization of the organic blue-light-emitting material-lithium tetra-(8-hydroxy-quinolinato) boron

介绍了8-羟基喹啉硼化锂(LiBq4)的制备步骤及其提纯方法.通过X射线衍射谱、红外光谱、核磁共振谱、荧光光谱、紫外和可见光区域的吸收光谱测试分析,定性说明了物质结构形式;给出了中心原子B和配位体中的N,O原子之间的作用情况,指出B只与O形成共价键,而和N不形成共价键.给出了各种光现象发生所在的能级;指出了LiBq4是属于受B离子微扰的有机配位体(喹啉环)发光;实验结果还表明,除N和B间零共价作用外,B-O间的强共价键实际上是导致LiBq4荧光光谱发生蓝移的另一个非常重要的因素;在光谱分析基础上,对影响LiBq4荧光峰值波长的各种因素进行了研究.

A lithium tetra-(8-hydroxy-quinolinato) boron sample is synthesized and purified, which is prone to emit blue light. In view of that the comprehensive understanding of the characteristics of LiBq4 is meaningful for organic light-emit ting devices (OLEDs) and the characterization of LiBq4 (including X-ray diffraction spectra, infrared absorption spectra, hydrogen nuclear magnetic resonance spectra, absorption spectra and photoluminescence spectra etc.) is carried out. These spectra make clear the molecular structure, such that the existence of quinoline ring is confirmed, etc. Moreover, the interaction among the various atoms in LiBq4 molecule is illustrated too. The interaction between B atom and O atom, which is thought to play important role in the blue-shift of fluorescent peak, is especially demonstrated in detail. Furthermore, the light emitting results from 8-hydroxyquinoline rings is ascertained and the energy levels on which electrons transition happen are ascertained. Finally the factors which produce the fluorescent peak blueshift is demonstrated.