Effect of carbazole-oxadiazole excited-state complexes on the efficiency of dye-doped light-emitting diodes

Xuezhong Jiang, Richard Alan Register, Kelly A. Killeen, Mark E. Thompson, Florian Pschenitzka, Thomas R. Hebner, James Christopher Sturm

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

Interactions between hole-transporting carbazole groups and electron-transporting 1,3,4-oxadiazole groups were studied by photoluminescence and electroluminescence (EL) spectroscopy, in blends of poly(N-vinylcarbazole) with 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PVK:PBD) and in random copolymers with carbazole and oxadiazole groups attached as side chains. Different excited-state complexes form in the blends, which exhibit exciplexes, and in the copolymers, which manifest electroplexes, due to topological constraints on the position of carbazole and oxadiazole units in the polymer. Both types of complex red-shift the EL spectra of the matrices compared with pure PVK homopolymer, although the shift is significantly greater for the electroplex. The presence of these complexes has a profound effect on the external quantum efficiency of dye-doped organic light-emitting diodes employing the blends or copolymers as matrices, as it strongly affects the efficiency of Förster energy transfer from the matrix to the dye. Single-layer devices doped with either coumarin 47 (C47), coumarin 6 (C6), or nile red (NR) were compared. Among the three dye-doped PVK:PBD devices, C6 doping yields the highest efficiency, while NR doping produced the most efficient copolymer devices, consistent with the degree of overlap between the EL spectrum of the matrix material and the absorption spectrum of the dye.

Original languageEnglish (US)
Pages (from-to)6717-6724
Number of pages8
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
StatePublished - May 15 2002

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carbazoles
copolymers
light emitting diodes
dyes
electroluminescence
excitation
matrices
material absorption
matrix materials
red shift
quantum efficiency
energy transfer
absorption spectra
photoluminescence
shift
polymers
spectroscopy
electrons
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Jiang, Xuezhong ; Register, Richard Alan ; Killeen, Kelly A. ; Thompson, Mark E. ; Pschenitzka, Florian ; Hebner, Thomas R. ; Sturm, James Christopher. / Effect of carbazole-oxadiazole excited-state complexes on the efficiency of dye-doped light-emitting diodes. In: Journal of Applied Physics. 2002 ; Vol. 91, No. 10 I. pp. 6717-6724.
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Effect of carbazole-oxadiazole excited-state complexes on the efficiency of dye-doped light-emitting diodes. / Jiang, Xuezhong; Register, Richard Alan; Killeen, Kelly A.; Thompson, Mark E.; Pschenitzka, Florian; Hebner, Thomas R.; Sturm, James Christopher.

In: Journal of Applied Physics, Vol. 91, No. 10 I, 15.05.2002, p. 6717-6724.

Research output: Contribution to journalArticle

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