论文部分内容阅读
利用向环金属配体的C—Ir键的对位进行苯基取代这一结构修饰策略,成功合成了两种新型铱(Ⅲ)配合物(3PhNbt)_2Ir(acac)和(3OMePhNbt)_2Ir(acac).相较其橙光发射的母体化合物(Nbt)_2Ir(acac),两个目标化合物的抗结晶性、非晶态热稳定性及溶解性均有显著提高,其磷光发射带也发生了5~10 nm的红移.以(3PhNbt)_2Ir(acac)和(3OMePhNbt)_2Ir(acac)为发光客体材料所制备的单层溶液加工电致红光器件,其最大发光亮度分别为1830 cd·m~(-2)和6630 cd·m~(-2),最大电流效率分别为2.4 cd·A~(-1)和8.7 cd·A~(-1),CIE1931色坐标分别为(0.61,0.39)和(0.62,0.38).相比之下,以母体化合物(Nbt)_2Ir(acac)为发光客体材料所制备的参比器件,其最大发光亮度则为1620 cd·m~(-2),最大电流效率仅为1.5 cd·A~(-1),CIE1931色坐标为(0.59,0.41).上述研究结果表明:向C—Ir键对位进行苯基修饰可以在提高铱(Ⅲ)配合物的可溶液加工性能的同时,获得更为红移的电致发光波长,是一种简单而有效的红光铱(Ⅲ)配合物的分子设计策略.
Two novel iridium (Ⅲ) complexes (3PhNbt) _2Ir (acac) and (3OMePhNbt) _2Ir (acac) were successfully synthesized by the structural modification strategy of phenyl substitution to the C-Ir bond of the cyclic metal ligand ) .Compared with the orange-emitting parent compound (Nbt) _2Ir (acac), the crystallinity, amorphous thermal stability and solubility of the two target compounds were significantly increased, and the phosphorescent emission bands also occurred in 5 ~ 10 nm red-shifted electroluminescence devices were fabricated by single layer solution prepared from (3PhNbt) _2Ir (acac) and (3OMePhNbt) _2Ir (acac) as luminescent guest materials with maximum luminescence intensity of 1830 cd · m ~ (-2) and 6630 cd · m ~ (-2), the maximum current efficiency was 2.4 cd · A ~ (-1) and 8.7 cd · A ~ (-1) respectively. The color coordinates of CIE1931 were (0.61,0.39 ) And (0.62,0.38) .In contrast, the reference device prepared with the host compound (Nbt) _2Ir (acac) as the luminescent guest material has a maximum luminance of 1620 cd · m -2, The maximum current efficiency is only 1.5 cd · A -1 and the color coordinate of CIE 1931 is (0.59, 0.41) .The results of the above studies show that the phenyl modification of the para-C-Ir bond can enhance the iridium (Ⅲ) complex The solution processing performance at the same time, get more Electrical photoluminescence wavelength red shift, is a simple and effective red Iridium (Ⅲ) complex molecular design strategy.