Improved operational stability of polymer light-emitting diodes based on silver nanowire electrode through pre-bias conditioning treatment

Yonghee Lee, Minwon Suh, Donghyuk Kim, Dongchan Lee, Hyein Chang, Ho Seok Lee, Yeon Won Kim, Taeyoung Kim, Kwang Suck Suh, Duk Young Jeon

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

For the first time, highly efficient and flexible polymer light emitting diodes (PLEDs) based on silver nanowire (AgNW) electrode, with improved operational stability by simply applying pre-bias conditioning treatment, are demonstrated. Reverse bias conditioning performed before J-V-L measurement of the PLEDs enables the rough AgNW networks to function properly as a bottom electrode by stabilizing current characteristics, and the devices continue to show consistent operational performances. Conditions of applied bias and thicknesses of active layer are controlled for optimization and it is found that high reverse voltage is required to obtain current stabilization. Adequate thickness of polymer is also necessary to avoid breakdown induced by reverse bias. The essential effect of pre-bias conditioning on the improved performances of PLEDs is investigated, and it is found that morphological change of AgNW networks contribute to the improvement in device performance. Some of the AgNWs that appear to be pathway of leakage current are deformed, and surface roughness (RMS) of the AgNW film is decreased while the sheet resistance of the film is maintained when the reverse bias conditioning is applied. It is also revealed that pre-bias conditioning is independent from directionality of the applied bias when utilizing insulating polymer sandwiched between two electrodes. Highly emissive and flexible polymer light-emitting diodes (PLEDs) based on silver nanowire (AgNW) electrodes with improved operational stability is demonstrated. Fluctuating features of leakage current become stabilized and the device performance is improved in the resulted PLEDs after simply running the devices once in reverse bias. Works to examine the morphological change of AgNW film are conducted in this work.

Original languageEnglish
Pages (from-to)6465-6472
Number of pages8
JournalAdvanced Functional Materials
Volume24
Issue number41
DOIs
Publication statusPublished - 2014 Nov 5

Keywords

  • leakage current
  • polymer light-emitting diodes
  • pre-bias conditioning
  • silver nanowires
  • welding

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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