新型蓝光有机电致磷光主体材料的设计、合成与性能研究

项目名称： 新型蓝光有机电致磷光主体材料的设计、合成与性能研究

项目编号： No.51303099

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 王强

作者单位： 陕西师范大学

项目金额： 25万元

中文摘要： 针对全磷光白光有机电致发光二极管的寿命受限于其中蓝光部分的问题，本研究将开发一类适用于蓝光有机电致磷光二极管的新型非共轭双极传输主体材料。将电子传输单元和空穴传输单元由σ-键组成的柔性间隔基团连接，可打断二者之间的π-共轭效应，使主体三线态能级不再受限于能隙宽度。通过电子和空穴传输单元在分子等级不同比例的混合，可以达到有机电致磷光二极管发光层内载流子传输的平衡。通过在主体分子设计中引入必要的化学基团，抑制主体材料结晶和激基复合物的形成。通过研究这类主体材料在掺杂和不掺杂蓝光客体条件下的能级、相稳定性、膜结构、光物理、载流子传输特性以及相应蓝光有机电致磷光器件的性能，优化改进材料结构，进而改进蓝光有机电致磷光器件的结构和改善器件寿命。通过将性能优异的主体材料用于白光器件的优化，制备高效稳定的全磷光白光有机电致发光二极管。本研究将促进蓝光主体材料和全磷光白光有机电致发光二极管的发展。

中文关键词： 有机电致发光二极管；双极传输主体材料；给体；受体；非共轭间隔基团

英文摘要： Previous research and development data show white phosphorescent organic light-emitting diode (PhOLED) operating lifetimes to be limited by the blue portion of the PhOLED. Therefore, a new class of non-conjugated bipolar hybrid hosts for blue PhOLEDs is being developed in which the electron transport moiety (ETM) and hole transport moiety (HTM) are covalently coupled together and the π-conjugation between the two moieties is interrupted by inserting a flexible spacer consisting of σ-bonds. These non-conjugated bipolar hybrids' triplet energies will not be constrained by the electrochemical energy gap. Molecular-level mixing across a range of ETM/HTM ratios will be achieved, which allows for adjustment of charge transport balance in PhOLEDs. The new PhOLED host materials will be designed to incorporate chemical groups that serve to suppress crystallization and exciplex formation. The energetics, phase stability, film structure, photophysical and charge transport properties of these host materials with and without blue phosphorescent dopants incorporated, and the blue PhOLEDs using these host materials will be thoroughly characterized. The information gleaned from analytical work will be used to guide further synthetic work to protect chemically weak spots in the materials. The results obtained from these studies

英文关键词： organic light-emitting diodes；bipolar host materials；donor；acceptor；non-conjugated spacer