Light-emitting diode based on oligo-phenylene vinylene and butyl-PBD blends

Jae Gyoung Lee, Byoungchoo Park, Hyung Suk Woo, Youngkyoo Kim, Chang Sik Ha, Choong Man Lee, Kwangho Jeong, Jeong Hyon Ha, Yong Rok Kim

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We have fabricated light-emitting diodes (LEDs) using organic materials; a polymer blend dispersing oligo-phenylene vinylene (oligo-PV), 1,4-distyrylbenzene and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-l,3,4-oxadiazole (butyl-PBD) as emissive materials into a soluble polyimide mixed with polyaniline (PANI) of emeraldine salt used as a hole transport material. These polymer dispersed materials were sandwiched between In and indium-tin-oxide (ITO) electrodes. In order to increase the electron injection into the emissive material, we have inserted a thin Mg layer between In and polymer blends. The electroluminescence (EL) spectra of LEDs showed noticeable enhancement of the oscillator strength of oligo-PV peak at 2.76 eV. This implies improved quantum efficiency of this blue light-emitting diode, resulting from the excitonic migration from butyl-PBD to oligo-PV. We have found that the EL device with host polymers, polyimide and PANI, displayed increasing device performance, lowering the turning point in I-V characteristics, compared to that of LED without PANI. Under normal illumination conditions, our devices with PANI showed visible blue-violet color at room temperature after applying a bias exceeding 8 V.

Original languageEnglish
Pages (from-to)895-898
Number of pages4
JournalSolid State Communications
Volume102
Issue number12
DOIs
Publication statusPublished - 1997 Jun

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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