Charge trap assisted high efficiency in new polymer-blend based light emitting diodes

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

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Polymer blend system, F81-xSYx, based on mixture of poly (9,9-dioctylfluorene) (F8) and a poly (para-phenylenevinylene) (PPV) copolymer, superyellow (SY), has been proven to be a high performance blend material in polymer light emitting diode (PLED). This blend system exhibits luminance (L) >104cdm-2, luminous efficiency (η) >21cdA-1 and low operating voltage (V) ~3-10V. The performance can be credited to the large difference (~0.6eV) between the highest occupied molecular orbital (HOMO) levels of F8 (~5.8eV) and SY (~5.2eV), where, SY molecules serve as hole-traps in the F8 host polymer and reduce their mobility. This dictates a balanced charge injection into the emissive layer and results in overall increase in the device performance.

Original languageBritish English
Pages (from-to)62-70
Number of pages9
JournalNano Energy
Volume21
DOIs
StatePublished - 1 Mar 2016

Keywords

  • Light emitting diodes
  • Poly(para-phenylenevinylenes)
  • Polyfluorenes
  • Polymer-blend diodes

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