Novel yellow phosphorescent iridium complexes with dibenzothiophene-S, S-dioxide-based cyclometalated ligand for white polymer light-emitting diodes
Novel yellow phosphorescent iridium complexes with dibenzothiophene-S, S-dioxide-based cyclometalated ligand for white polymer light-emitting diodes
复制标题
用于白色聚合物发光二极管的新型黄色磷光铱配合物与二苯并噻吩-S、S-二氧化物基环金属化配体
DOI：
10.1016/j.dyepig.2018.07.019
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发表时间：
2018
影响因子：
4.5
通讯作者：
Huang Fei
中科院分区：
文献类型：
--
作者：
Liang Aihui;Luo Ming;Liu Yusheng;Wang Han;Wang Zhiping;Zheng Xiaoyan;Cao Tian;Liu Dewang;Zhang Yong;Huang Fei
我们首次使用二苯并噻吩-S,S-二氧化物基环金属化配体设计并合成了两种新型黄色磷光铱配合物，能够生产高效的黄色和白色聚合物发光器件（PLED）。所得铱配合物表现出良好的热稳定性和高光致发光量子产率。黄色和白色 PLED 均采用相同的 ITO/PEDOT:PSS/发射层 (EML)/CsF/Al 单发射层配置制造。基于(p-CzFSOPy)2IrPic的黄色磷光PLED实现了最佳器件性能，峰值发光效率(LE)为13.3cd/A，峰值外量子效率(EQE)为5.3%。更重要的是，含有铱(III)双(2-(4,6-二氟苯基)-吡啶基-N,C2')吡啶甲酸铱(FIrpic)蓝色荧光粉和(p-CzFSOPy)2IrPic黄色荧光粉的双元件WPLED以适当的比例掺杂到PVK:OXD-7基质中，表现出最大LE为19.2cd/A，最大EQE为9.6%，极高的亮度为 18717cd/m2，国际照明委员会 (CIE) 坐标为 (0.317, 0.448)。而且，在实际应用亮度为1000cd/m2时，LE仍然高达19.0cd/A，略有下降。
We have designed and synthesized two novel yellow phosphorescent iridium complexes using dibenzothiophene-S,S-dioxide-based cyclometalated ligand for the first time, which are capable of producing highly efficient yellow and white polymer light-emitting devices (PLEDs). The resulted iridium complexes display good thermal stability and high photoluminescence quantum yields. Both yellow and white PLEDs are fabricated with an identical single-emission-layer configuration of ITO/PEDOT:PSS/emission layer (EML)/CsF/Al. For the yellow phosphorescent PLEDs based on (p-CzFSOPy)2IrPic, the best device performances with a peak luminous efficiency (LE) of 13.3 cd/A and a peak external quantum efficiency (EQE) of 5.3% are achieved. More importantly, the two-element WPLEDs containing iridium (III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2′) picolinate (FIrpic) as blue and (p-CzFSOPy)2IrPic as yellow phosphors doped into a PVK:OXD-7matrix at an appropriate ratio exhibited a maximum LE of 19.2 cd/A, a maximum EQE of 9.6%, an extremely high luminance of 18717 cd/m2and Commission Internationale de L'Eclairage (CIE) coordinate of (0.317, 0.448). Moreover, at a luminance for practical application of 1000 cd/m2, the LE still remains as high as 19.0 cd/A, with a very slight decrease.