基于高效深蓝有机电致发光材料的双极传输型磷光主体材料的设计、合成及其应用

Phosphorescent organic light-emitting diodes (PhOLEDs) show a bright future for flat-panel displays and solid state lighting due to higher quantum efficiencies compared with traditional fluorescent OLEDs. Fine quality full-color displays or white color lighting sources need to be constructed by doping blue, green, and red phosphors into different corresponding host materials, which lead to complicated fabrication process and expensive manufacture cost of materials. Recently, red and green PhOLEDs based on one deep blue fluorescent host were reported, but most of their efficiency decayed very rapidly at high brightness due to low triplet energy and poor transporting properties of the host materials. .In this proposal, combining two advantages of deep blue organic materials′ high-efficiency luminescence and bipolar host materials′ high triplet energy and bipolar transporting properties organically, several series of novel deep blue organic light-emitting materials will be designed and synthesized. Relationship between molecular structure and fluorescence quantum yield, triplet energy and carrier transporting properties will be systematically investigated. We will discuss the possibility of obtaining high-efficiency deep blue organic light-emitting materials as red and green phosphorescent bipolar hosts simultaneously with high fluorescent quantum yield, proper triplet energy and balanced carrier transporting properties and realizing high-efficiency, stable and long life-time phosphorescent devices at high brightness which are of theoretical significance and great application.

磷光有机发光二极管相对于传统的荧光有机电致发光具有更高的量子效率, 在平板显示和固态照明方面有极大的应用前景。但高性能的器件需要将不同的红、绿、蓝等磷光发光材料掺杂在不同的主体材料中，制备工艺非常繁琐，材料成本高！共用一种有机蓝光发光主体材料的红、绿等磷光器件最近虽有所报道，但器件效率在高亮度下衰减很快！这主要归因于主体材料的三重态能量低、载流子传输不平衡。.本项目拟将深蓝有机发光材料的高效发光性能与双极传输主体材料的高三重态能级和双载流子传输性能等优点有机结合起来，设计、合成几个系列的新型有机电致发光材料，系统研究分子结构与其荧光量子产率、三重态能级、载流子传输等性能之间的构效关系，探讨获得发光量子产率高、三重态能级合适、载流子传输平衡的高效深蓝有机电致发光材料可以同时作为红、绿等磷光的双极传输型主体材料，实现高亮度下的高效、稳定、长寿命的磷光器件的可能性，具有一定的理论意义和实用价值。

原则上，载流子传输平衡、三重态能级较高的深蓝发光材料可以同时用作红光、绿光等低能量磷光材料的主体材料，有利于简化器件制备工艺，降低成本。然而，高效的非掺杂深蓝有机电致发光材料往往不适合做磷光有机电致发光器件的主体材料，这主要归因于它们的三重态能级较低、载流子传输性能差。另一方面，高效的红光、绿光等磷光的主体材料单独作为发光材料时效率往往也很差，这主要因为其固体发光量子产率低。..本项目将深蓝有机发光材料的高效发光性能与双极传输主体材料的高三重态能级和双载流子传输性能等优点有机结合起来，设计、合成了几个系列的新型有机电致发光材料，系统研究了分子结构与其荧光量子产率、三重态能级、载流子传输等性能之间的构效关系，获得了发光量子产率高、三重态能级合适、载流子传输平衡的高效深蓝有机电致发光材料，兼具红、绿等长波长磷光主体材料，实现了高效非掺杂深蓝荧光器件和长波长磷光器件，结合蓝光荧光和磷光器件，实现了高性能的荧光/磷光复合型白光器件，器件效率可以跟文献所报道的媲美。.在Chem. Sci.、ACS Appl. Mater. Interfaces、Adv. Opt. Mater.和J. Mater. Chem. C等国际化学和材料权威杂志发表高水平论文33篇，其中包括4篇封面文章，JCR分区一区14篇，二区15篇，远超原计划的8-12篇预期研究成果！