Copolyfluorenes containing partially hydrolyzed phosphonate pendant groups: Synthesis, characterization and application as electron injection layers for enhanced electroluminescence of PLEDs

Chia Shing Wu, Chen Yi Chou, Yun Chen

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

Balance in charge injection is crucial to improve the device performance of polymer light-emitting diodes (PLEDs); however, hole injection is much easier than electron injection in most PLEDs. We synthesized copolyfluorenes containing pendant phosphonate groups (PF-EP) or partially hydrolyzed phosphonate groups (PF-EPK) and successfully applied them as electron injection layers (EILs) in PLEDs to significantly enhance the device performance. Multilayer PLEDs [ITO/PEDOT:PSS/Superyellow (SY)/PF-EP + PF-EPK/Al] were readily fabricated using blends of PF-EPK and PF-EP as EILs by the solution process. The device with PF-EP doped with 2.5% PF-EPK as an EIL exhibited the best performance. The device performances were enhanced to 12052 cd m-2, 3.62 cd A -1 and 1.38 lm W-1, respectively, from 725 cd m -2, 0.16 cd A-1 and 0.05 lm W-1 of a non-EIL device. The performance enhancement has been attributed to improved electron injection which has been confirmed by the increase in open-circuit voltage (Voc) obtained from photovoltaic measurements. The results indicate that PF-EPK is a promising electron-injection material for optoelectronic devices with a high work function Al cathode. This journal is

原文English
頁(從 - 到)6665-6674
頁數10
期刊Journal of Materials Chemistry C
2
發行號32
DOIs
出版狀態Published - 2014 八月 28

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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