Enhancement of spectral stability and efficiency on blue light-emitters via introducing dibenzothiophene-S,S-dioxide isomers into polyfluorene backbone
Enhancement of spectral stability and efficiency on blue light-emitters via introducing dibenzothiophene-S,S-dioxide isomers into polyfluorene backbone
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通过将二苯并噻吩-S,S-二氧化物异构体引入聚芴主链提高蓝光发射器的光谱稳定性和效率
DOI：
10.1016/j.orgel.2009.04.021
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发表时间：
2009-08
期刊：
影响因子：
--
通讯作者：
Li, Yuanyuan
中科院分区：
文献类型：
--
作者：
Cao, Yong;Zou, Jianhua;Yang, Wei;Wu, Hongbin;Ying, Lei;Li, Yuanyuan
通过铃木缩聚反应，将广泛使用的9，9-二辛基-2，7-荧烯单体与二苯并噻吩基-S、S-二氧化物异构体进行共聚反应。通过在聚荧烯主链中引入FSO单元，显著提高了蓝光聚荧烯的光谱稳定性和光谱效率。随着热处理温度和电流密度的变化，所得共聚物及其器件分别具有稳定的光致发光(PL)和电致发光(EL)光谱。此外，在发光和电致发光光谱中，通常与准分子/聚集或缺陷相关的绿色发射是不存在的。事实上，FSO单元对聚荧烯主链中的电子起到了深陷阱的作用，可以抑制长波长发射。此外，FSO单元降低了多荧烯的LUMO能级，从而可以在基于聚合物的器件中保持平衡的载流子注入和传输，从而提高了器件的效率。基于PF-2，8FSO1和PF-3，7FSO5的器件在CIE坐标为(0.16，0.07)时，外量子效率分别为3.6%和3.7cd/A；在CIE坐标为(0.15，0.12)时，外量子效率分别为3.8%和4.6cd/A。结果表明，聚(二苯并噻吩基-S，S-二氧化硅-9，9-二辛基-2，7-荧烯)S有望成为一种光谱稳定、发光效率高的蓝色发光聚合物。
Dibenzothiophene-S,S-dioxide isomer (FSO) monomers were copolymerized with extensively employed 9,9-dioctyl-2,7-fluorene monomer by Suzuki polycondensation. By introducing FSO unit into polyfluorene backbone, the spectral stability and efficiency of the blue-emitting polyfluorenes are significantly improved. All of the obtained copolymers and their devices exhibit stable photoluminescence (PL) and electroluminescence (EL) spectra, respectively, upon change of thermal annealing temperature and current densities. Furthermore green emission which is usually associated with excimer/aggregation or defects is absent in PL and EL spectra. In fact, the FSO unit acts as a deep trap for electron in the polyfluorene backbone, which could suppress the long wavelength emission. Moreover, the FSO unit lowers LUMO energy levels of the polyfluorenes, thus can maintain a balanced charge carrier injection and transport in the device based on the polymers, and therefore improves the device efficiencies. The device based on PF-2,8FSO1 and PF-3,7FSO5 show an external quantum efficiency (EQE) of 3.6% and a luminance efficiency (LE) of 3.7cd/A with CIE coordinate of (0.16, 0.07), and an EQE of 3.8% and a LE of 4.6cd/A with CIE coordinate of (0.15, 0.12), respectively. The results indicate that poly (dibenzothiophene-S,S-dioxide-co-9,9-dioctyl-2,7-fluorene)s could be a promising candidate for blue-emitting polymers with spectral stability and high efficiency.
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