Highly efficient PLEDs based on poly(9,9-dioctylfluorene) and Super Yellow blend with Cs2CO3 modified cathode

M. U. Hassan, Yee Chen Liu, Kamran Ul Hasan, H. Butt, Jui Fen Chang, R. H. Friend

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Polymer light emitting diodes (PLEDs) based on the blend of 90% poly(9,9-dioctylfluorene) (F8) and 10% Super Yellow (SY) were used as the emissive layer and it exhibited high luminous efficiency up to ∼27 cd A-1. Hole-trapping nature native to the proposed blend system and efficient electron injection via Al/Ca/Cs2CO3 cathode was used against the conventional ITO/PEDOT:PSS anode which provided a well-balanced charge transport across the emissive layer. Thereby, the scheme maximizes the radiative recombination of these excitons within the bulk and away from the cathode. Consequently, non-radiative quenching effects at the cathode surface were avoided which resulted in ultrahigh efficiency of such devices.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalApplied Materials Today
Volume1
Issue number1
DOIs
StatePublished - 2015

Keywords

  • Cathode modification
  • Interfacial engineering
  • Light emitting diodes
  • Poly(para-phenylenevinylenes)
  • Polyfluorenes

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