新型蓝色磷光嘧啶铱(Ⅲ)配合物的合成及发光性质  

Synthesis and Luminescence Property of Two New Blue Phosphorescent Iridium(Ⅲ) Diazine Complexes

作　　者：葛国平[1] 李春艳[1] 郭海清[2] 

机构地区：[1]宁波大学材料科学与化学工程学院 宁波市新型功能材料及其制备科学实验室-省部共建国家重点实验室培育基地,浙江宁波315211 [2]北京大学化学与分子工程学院北京分子科学国家实验室稀土材料化学与应用国家重点实验室,100871

出　　处：《发光学报》2012年第6期591-595,共5页Chinese Journal of Luminescence

基　　金：宁波市自然科学基金(2010 A610164);宁波大学学科项目(xkl073);宁波大学王宽城基金资助项目

摘　　要：设计并合成了以2-(2,4-二氟苯基)嘧啶(DFPPM)为主配体的两种新型二嗪铱配合物[(DFPPM)2IrCl-(PPh3)](Ph:苯基)和[(DFPPM)2Ir(CN)(PPh3)],用核磁共振(NMR)和质谱等方法对其进行了表征,并用紫外-可见吸收光谱和光致发光光谱对其光学性质进行了研究。光致发光光谱结果显示:配合物[(DFPPM)2IrCl(PPh3)]的发射峰波长为472 nm和489 nm;而配合物[(DFPPM)2Ir(CN)(PPh3)]的发射峰波长为447 nm和472 nm,1931CIE色度坐标为(0.14,0.15),是一种深蓝色磷光材料。以[(DFPPM)2Ir-(CN)(PPh3)]为客体材料、PVK为主体材料制备了电致发光器件,研究了其电致发光光谱。结果表明,电致发光光谱与光致发光光谱相比有较大程度的红移。We designed and synthesized two new iridium （ Ⅲ ） diazine complexes [ （DFPPM）2IrCl- （ PPh3 ） ] and [ （ DFPPM）2 Ir （CN） （ PPh3 ） ], where Ph = phenyl, containing 2- （2,4-difluorophenyl）- pyrimidine （DFPPM） as the cyclometalated ligands. OLEDs with iridium（m） diazine complexes as phosphor have high-efficiency and long luminance half-life, however, diazine compounds show a sig- nificantly redshift of the emission band than pyridine compounds. Therefore, it will be a great challenge to synthesize blue phosphorescent materials with diazine compounds as ligands. The complexes were characterized by nuclear magnetic resonance （NMR） spectroscopy and mass spectrometry （MS） and their photophysical properties were investigated by UV-Vis spectroscopy and photolumi- nescence （PL） technique. The PL spectrum of [ （DFPPM）2IrCI（PPh3）]in solution has its maximum emission mum emission peak at 472 nm and 489 nm, whereas [ （ DFPPM）2Ir（CN） （PPh3 ） ] has its maxipeak at 447 nm and 472 nm. The luminescence of [ （DFPPM）2IrCl（ PPh3 ） ] shifts to the blue region compared to that of （DFPPM）2Ir （acac）, indicating that the HOMO-LUMO gap is increased due to the higher ligand field strength of the phosphine. Compared with [ （DFPPM）2IrCl- （ PPh3 ） , [ （DFPPM） 2Ir（CN） （ PPh3 ） ] shows a significantly blue-shift of the emission band. The ligand field strength of CN is larger than Cl due to its strong donor and w acceptor ability. This causes larger splitting of the d-orbital and consequently more lowering of the metal-centered HOMO. Complex of （DFPPM）zIr（CN） （PPh3 ） emits deep blue light with Commission Internationale de l＇Eclairage （CIE） coordinates of （0.14, 0.15）. Electroluminescence （EL） device was fabricated when the complex of [ （DFPPM）2It（CN） （PPh3 ）] was doped into polymer host polyvinylcarbazole （PVK）. Compared to the photoluminescence spectrum, a red-shifted of emission was observed from the

关 键 词：二嗪铱配合物 有机电致发光器件 磷光材料 蓝光材料 

分 类 号：TN383.1[电子电信—物理电子学]