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Improvement of efficiency in π-conjugated polymer based on phenothiazine by introduction of oxadiazole pendant as a side chain
Macromolecular Research ( IF 2.4 ) Pub Date : 2009 , DOI: 10.1007/bf03218869
Jiyoung Choi , Bong Lee , Joo Hyun Kim , Kyehwan Lee

A new π-conjugated polymer, poly[(2-methoxy-(5-(2-(4-oxyphenyl)-5-phenyl-1,3,4-oxadiazole)-hexyloxy))-1,4-phenylene-1,2-ethenylene-alt-(10-hexyl-3,7-phenothiazine)-1,2-ethenylene] (PTOXDPPV), was synthesized by the Heck coupling reaction. The electron transporting unit, conjugated 1,3,4-oxadiazole (OXD), is attached on the main chain via linear 1,6-hexamethylenedioxy chain. The band gap and photoluminescence (PL) maximum of PTOXDPPV are 2.35 eV and 565 nm, respectively. These values are very close to those of poly[(2,5-didecyloxy-1,4-phenylene-1,2-ethenylene)-alt-(10-hexyl-3,7-phenothiazine)-1,2-ethenylene] (PTPPV), which does not have OXD pendant. The estimated HOMO energy level of PTOXDPPV was -4.98 eV, which is very close to that of PTPPV (-4.91 eV). The maximum wavelength of EL device based on PTOXDPPV and PTPPV appeared at 587 and 577 nm, respectively. In the PL and EL spectrum, the emission from OXD pendant was not observed. This indicates that the energy transfer from OXD pendants to main chain is occurred completely. The EL device based on PTOXDPPV (ITO/PEDOT/PTOXDPPV/Al) has an efficiency of 0.033 cd/A, which is significantly higher than the device based on PTPPV (ITO/PEDOT/PTPPV/Al) (4.28×10-3 cd/A). From the results, we confirm that the OXD pendants in PTOXDPPV facilitate hole-electron recombination processes in the emissive layer effectively.

中文翻译:

通过引入恶二唑侧链作为侧链提高基于吩噻嗪的π共轭聚合物的效率

一种新型的π共轭聚合物,聚[[(2-甲氧基-(5-(2-(4-氧苯基)-5-苯基-1,3,4-恶二唑)-己氧基))-1,4-亚苯基-1 ,2- ethenylene- ALT - (10-己基-3,7-噻嗪基)-1,2-亚乙烯基](PTOXDPPV),通过Heck偶联反应合成。电子传输单元共轭1,3,4-恶二唑(OXD)通过线性1,6-六亚甲基二氧基链连接在主链上。PTOXDPPV的带隙和最大光致发光(PL)分别为2.35 eV和565 nm。这些值非常接近那些聚[(2,5-二癸氧基-1,4-亚苯基-1,2-亚乙烯基) -中高音-(10-己基-3,7-吩噻嗪)-1,2-亚乙烯基](PTPPV),其没有OXD侧基。PTOXDPPV的估计HOMO能级为-4.98 eV,非常接近PTPPV(-4.91 eV)。基于PTOXDPPV和PTPPV的EL器件的最大波长分别出现在587和577 nm。在PL和EL光谱中,未观察到OXD悬垂物的发射。这表明从OXD侧链到主链的能量转移已完全发生。基于PTOXDPPV(ITO / PEDOT / PTOXDPPV / Al)的EL器件的效率为0.033 cd / A,大大高于基于PTPPV(ITO / PEDOT / PTPPV / Al)的器件(4.28×10 -3 cd /一种)。从结果,我们证实PTOXDPPV中的OXD悬垂物有效地促进了发射层中的空穴电子重组过程。
更新日期:2020-09-14
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