Liu Jie, Hu Sujun, Zhao Wei, Zou Qinghua, Luo Wen, Yang Wei, Peng Junbiao, Cao Yong
Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials, Ministry of Education, South China University of Technology, Guangzhou 510640, China.
Macromol Rapid Commun. 2010 Mar 2;31(5):496-501. doi: 10.1002/marc.200900547. Epub 2009 Dec 23.
Novel poly[(fluorene)-co-(2,8-dioctyldibenzothiophene-S,S-dioxide-3,7-diyl)]s were synthesized. The octyl group on the 2,8-dioctyldibenzothiophene-S,S-dioxide (DOSO) unit improved the solubility of the polymers and broadened the optical band gap from 2.95 to 3.20 eV as the content of DOSO unit increases. The electroluminescence (EL) spectra of polymers show CIE coordinates around (0.16, 0.07) independent of the ratio of DOSO units in the polymers, owing to the ICT and steric hindrance dual-function. A high efficiency of 3.1 cd · A(-1) (EQE = 3.9%) was obtained with the configuration of ITO/PEDOT:PSS/polymer/Ba/Al. The results indicate that PF-3,7DOSOs could be a promising candidate for saturated blue-emitting polymers with spectral stability and high efficiency.
合成了新型聚[（芴）-co-（2,8-二辛基二苯并噻吩-S,S-二氧化物-3,7-二基）]。随着2,8-二辛基二苯并噻吩-S,S-二氧化物（DOSO）单元含量的增加，2,8-二辛基二苯并噻吩-S,S-二氧化物单元上的辛基提高了聚合物的溶解性，并使光学带隙从2.95 eV拓宽至3.20 eV。由于分子内电荷转移（ICT）和空间位阻双重作用，聚合物的电致发光（EL）光谱显示，其CIE坐标约为（0.16, 0.07），与聚合物中DOSO单元的比例无关。采用ITO/PEDOT:PSS/聚合物/Ba/Al结构，获得了3.1 cd·A⁻¹（外量子效率EQE = 3.9%）的高效率。结果表明，PF-3,7DOSOs可能是具有光谱稳定性和高效率的饱和蓝光发射聚合物的有前途的候选材料。
