Enhanced light output in bilayer light-emitting diodes with film thickness variations

Jong Hyeok Park, Kwang Jik Lee, O. Ok Park, Jae Woong Yu, Young Chul Kim, Jai Kyeong Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Electroluminescence (EL) and the dynamics of charge carrier recombination in the PVK/poly(9,9′-dihexylfluorene-2,7-divinylene-m-phenylenevinylene- stat-p-phenylenevinylene)(PDHFPPV) bilayer EL devices, which have various film thickness ratios, were studied. The indium-tinoxide (ITO)/(PVK/PDHFPPV bilayer)/Li:Al devices showed more enhanced color quality compared with those of single and blended devices. The current-voltage-luminescence characteristics of the devices, which have a different PVK/PDHFPPV thickness ratio, are systematically studied and compared with a best PVK:PDHFPPV blended device. The EL light output of bilayer devices can be improved remarkably by controlling PVK and PDHFPPV polymer thickness. The ITO/(PVK (60 nm)/PDHFPPV (50 nm) bilayer)/Li:Al device showed ∼50 times improved light output compared with that of best blended device.

Original languageEnglish
Pages (from-to)101-104
Number of pages4
JournalChemical Physics Letters
Volume386
Issue number1-3
DOIs
Publication statusPublished - 2004 Mar 1

Fingerprint

Electroluminescence
Light emitting diodes
Film thickness
Indium
film thickness
light emitting diodes
output
electroluminescence
Charge carriers
thickness ratio
Luminescence
Polymers
Color
indium
Electric potential
charge carriers
luminescence
color
polymers
electric potential

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Park, Jong Hyeok ; Lee, Kwang Jik ; Park, O. Ok ; Yu, Jae Woong ; Kim, Young Chul ; Kim, Jai Kyeong. / Enhanced light output in bilayer light-emitting diodes with film thickness variations. In: Chemical Physics Letters. 2004 ; Vol. 386, No. 1-3. pp. 101-104.
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Enhanced light output in bilayer light-emitting diodes with film thickness variations. / Park, Jong Hyeok; Lee, Kwang Jik; Park, O. Ok; Yu, Jae Woong; Kim, Young Chul; Kim, Jai Kyeong.

In: Chemical Physics Letters, Vol. 386, No. 1-3, 01.03.2004, p. 101-104.

Research output: Contribution to journalArticle

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