基于苯基修饰策略的新型可溶液加工红光铱配合物的设计、合成及电致发光性能研究

doi:10.6023/A17010015

摘要/Abstract

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.

关键词: 电致发光, 红光铱配合物, 可溶液加工, 苯基取代, 非晶态稳定性

The exploitation of high-performance solution-processable phosphorescence organic light-emitting diode (PhOLED) materials is of great significance for the realization of large-area, low-cost and flexible display. On the basis of our previous findings that the para-phenylation (phenyl or 4-methoxyphenyl, with respect to the C-Ir bond) on the cyclometalated ligand (C^N ligand) of bis[2-phenylbenzothiazolato-N,C²']iridium(III)(acetylacetonate) can result in compounds with drastically enhanced film amorphism hence much improved electroluminescence (EL) performance, herein, this para-phenylation strategy was applied to Ir(III) complexes bearing a molecular platform of orange-emissive bis[2-(6-diphenylamino)phenylbenzothiazolato-N,C²']iridium(III)(acetylacetonate)[(Nbt)₂Ir(acac)] to afford two new Ir(III) complexes, namely (3PhNbt)₂Ir(acac) and (3OMePhNbt)₂Ir(acac). X-ray diffraction (XRD) characterization results revealed that both the two objective compounds possess much enhanced film amorphism than their parent compound (Nbt)₂Ir(acac), validating the efficacy of this para-phenylation strategy in achieving Ir(III) complexes with enhanced film amorphism. Addi-tionally, in comparison with (Nbt)₂Ir(acac), both (3PhNbt)₂Ir(acac) and (3OMePhNbt)₂Ir(acac) show much enhanced solubility in common organic solvents, together with 5~10 nm bathochromic-shifted phosphorescence band to red region. As a consequence, (3PhNbt)₂Ir(acac) and (3OMePhNbt)₂Ir(acac) were expected to be promising guest materials for the fabrication of high-performance solution-processed red PhOLEDs. EL characterization results indicated that for single-layer red solu-tion-processed PhOLEDs using (3PhNbt)₂Ir(acac) and (3OMePhNbt)₂Ir(acac) as the guest dopant, they show peak current efficiency of 2.4 cd·A^-1 and 8.7 cd·A^-1, maximum brightness of 1830 cd·m^-2 and 6630 cd·m^-2, and CIE coordinates of (0.61, 0.39) and (0.62, 0.38), respectively. In contrast, the contral device based on the orange-emissive (Nbt)₂Ir(acac) only shows a peak current efficiency of 1.5 cd·A^-1, maximum brightness of 1620 cd·m^-2, and CIE coordinates of (0.59, 0.41). These results confirmed that para-phenyl modification on the C^N ligand (with respect to the C-Ir bond) is indeed an effective approach to acquiring high-performance solution-processable PhOLED Ir(III) complexes with simultaneously red-shifted emission band.

Key words: electroluminescence, red iridium(III) complex, solution-processable, phenylation, amorphism

引用此文

陈仕琦, 代军, 周凯峰, 罗艳菊, 苏仕健, 蒲雪梅, 黄艳, 卢志云. 基于苯基修饰策略的新型可溶液加工红光铱配合物的设计、合成及电致发光性能研究[J]. 化学学报, 2017, 75(4): 367-374.

Chen Shiqi, Dai Jun, Zhou Kaifeng, Luo Yanju, Su Shijian, Pu Xuemei, Huang Yan, Lu Zhiyun. Synthesis and Characterization of New Solution-Processable Red Iridium (III) Complexes Based on a Phenylation Strategy[J]. Acta Chim. Sinica, 2017, 75(4): 367-374.

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