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研究了一种新型红色磷光材料及其在有机电致磷光器件(OLEDs)中应用。在经典红色磷光材料btp2Ir(acac)的配体2-苯并噻吩吡啶的吡啶环的5位引入吸电子基团CF3,将辅助配体换为2-吡啶甲酸,成功研制出了双(2 -(2′-苯并[b]噻吩基)吡啶)吡啶甲酸合铱配合物[(btfmp)2Ir(pic)]。这种结构可以改变了原配合物的电子云分布,三氟甲基的引入将导致原分子的LUMO能下降,减小了HOMO与LUMO的能隙,引起发光峰位的红移,但2-吡啶甲酸又可引起发光蓝移,最终得到了最大峰位为637 nm的饱和红光新的铱(Ⅲ)配合物,为通过简单配体修饰设计和制备新的有机磷光材料提供了一种简洁途径。
A new red phosphorescent material was studied and its application in organic electro-phosphorescent devices (OLEDs). The electron-withdrawing group CF3 was introduced to the 5-position of the pyridine ring of the ligand 2-benzothiophene pyridine, which is the ligand of the classic red phosphorescent material btp2Ir (acac), and the bis- (2- (2’-benzo [b] thienyl) pyridine) iridium complex picolinate [(btfmp) 2Ir (pic)]. This structure can change the distribution of the original complex electron cloud, the introduction of trifluoromethyl will lead to the original molecule LUMO energy decreases, reducing the energy gap HOMO and LUMO, causing the red-shifted emission peaks, but 2- Picolinic acid can cause a blue-shift of luminescence. Finally, a new saturated iridium (III) complex with a maximum peak position of 637 nm is obtained, which provides a concise form for designing and preparing new organic phosphorescent materials through simple ligand modification way.