新型铱配合物的合成和有机电致发光性能研究

In recent decades, organic light-emitting diodes (OLEDs) are evolving because of low power consumption and the possibility to fabricate large and brilliant flat panel display at a moderate price, to prepare illuminating wall papers and micro display for all types of applications. As the emitters, phosphorescent Ir(III) complexes play an important part in efficient OLEDs fabrication due to the high quantum efficiency and short lifetime of triplet excited states. The photoluminescence, carrier-transporting ability and electroluminescence properties of the iridium complexes can be affected greatly by the main ligands (C∧N) and ancillary ligands (LX and N∧N). To improve the performances of OLEDs based on iridium complexes, we designed some novel ancillary ligands, such as tetraphenylimidodiphosphinate, acyclic phosphazene, guanidinate, 1,3,5-triazapentadienyl derivatives with different substitutes and main C∧N ligands, such as introduce F, CF3 and 1,3,4-oxadiazole, bisphenylphosphine oxide, triphenylsilicon or pyrazine, pyrimidine, triazine units to the ppy or piq etc. Through the study of the luminescence properties of the complex, we want to the find the relationship of the photoluminescence and carrier mobility with molecular structure. Then by the investigation of the OLEDs properties with the iridium complexes as the emitters, we try to obtain the law of the electroluminescence with the device and molecular structure. From the research we hope the results can guide us to design the new materials and the OLEDs structure with improved device performances. The target of this research is to provide the theory and experiment support for the commercial application in OLEDs of the phosphorescence metal complexes.

有机电致发光器件(OLEDs)在平板显示、照明等方面有广阔的应用前景。作为器件的发光材料，铱配合物的发光、载流子传输和有机电致发光性能与配合物的主配体、辅助配体的结构密切相关。本项目从含有新型辅助配体和功能化铱配合物的合成及OLEDs的制备出发，设计新型的辅助配体(如二(二苯基膦酰)胺衍生物类、二(二苯基膦腈-N-R)胺类、胍基配体和1,3,5-三氮杂戊二烯(氮杂beta-二亚胺) 配体等）、主配体（如在ppy或piq等的芳环及N杂环(吡嗪、嘧啶、三嗪等)的配体上引入F、CF3或者1,3,4-噁二唑、二苯基氧膦、三苯基硅等基团）和相应的铱配合物，研究其光致发光、载流子迁移率和配合物结构的关系，探索电致发光性能和材料的结构、载流子迁移率和器件结构之间的规律。为配合物和器件两方面的设计提供理论和实验指导，显著提高铱配合物功能材料的性能，从而能够为其电致发光器件的最终商业应用提供技术支持。

有机电致发光二极管（OLED）拥有诸多无可比拟的优势，被誉为新一代显示技术，是我国七大战略性新兴产业重点发展方向之一。在目前国际上商业化的OLED产品中，红光和绿光材料多数都是使用铱配合物磷光材料。但目前OLED产业光电材料核心技术多被国外公司所垄断，我国材料企业主要参与OLED材料中间体和单体粗品的供应，要直接提供单体产品面临着较高的专利门槛和应用壁垒。. 本项目的研究目的通过引入不同的功能基团设计辅助配体、在主配体的苯环以及N杂环的不同位置上引入电子传输基团，合成新型铱配合物并改善配合物材料的综合光电性能，进一步制备电致发光器件；探索和发现铱配合物的结构与其光电性能间的规律，最终得到高性能的铱配合物材料和电致发光器件，打破国际垄断。. 四年来在经费的支持下项目开展的比较顺利，基本上按照项目的计划进行，在光电材料的合成和电致发光器件的性能研究方面取得了比较好的成果。本项目设计合成了几十种红绿蓝三基色铱配合物，制备的蓝光器件的最大电流效率达到60 cd/A，绿光器件的最大电流效率达到113 cd/A，红光器件的最大电流效率达到62 cd/A，并且都显示了比较小的器件效率滚降，部分材料正在马鞍山研究院进行中试和产业化推广。在Nat. Mater.、Adv. Opt. Mater.、Chem. Commun.、Sci. Rep.和J. Mater. Chem. C等发表论文38篇，申请国家发明专利37项，并多次受邀请在国内学术做邀请报告和口头报告，培养了博士后1名、博士生3名和硕士生3名，圆满的完成了计划的研究目标。