有机小分子电致磷光材料研究进展

在过去20年对小分子电致发光器件的研究中,由于没有充分利用三线态激子能量,器件的内量子效率存在25%的理论极限.由于有机磷光染料可以同时利用其单线态和三线态激子,理论上可以使器件的内量子效率达到100%,突破了25%的理论极限,因而近几年在小分子主体材料中掺杂磷光染料制成器件的研究备受关注.综述了近几年金属有机电致磷光材料的研究进展,重点评述了金属铱配合物在分子设计上的研究进展,同时论述了其发光机理和掺杂剂材料以及器件制作的研究进展,展望了金属有机配合物电致磷光材料的发展前景,并提出了今后磷光材料的发展方向.

Progress in Research on Organic Small Molecule Electrophosphorescent Materials

During the past two decades, the triplet exciton states of electrophosphorescent materials are not fully utilized. Later, electroluminescences based on organic phosphorescent complexes have drawn particular attention in recent years. The notable advantage of phosphorescences is that they can simultaneously utilize both singlet and triplet exciton states which can reach to 100% internal quantum efficiency theoretically. This article reviews the progress in research on organometallic complexes used as electrophosphorescent materials in organic light-emitting diodes(OLED) in recent years, focusing on the development of heavy metal iridium complexes. It also discusses the genuine electrophosphorescent mechanism and some developments in using phosphorescent dopants.It includes the prospect of the development of organometallic electrophosphorescent materials. And it also puts forward the ways of future development for phosphorescent materials.