Exciplex formations at the HTL/Alq3 interface in an organic light-emitting diode

Influence of the electron-hole recombination zone and electric field

Naoki Matsumoto, Chihaya Adachi

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In this work, we investigate the influence of weak intermolecular interactions, which have not previously been carefully considered, in hole transport material (HTM)/tris(8-hydroxyquinoline)aluminum (Alq 3)-based organic light-emitting diodes (OLEDs). Although such weak interactions quench Alq3 fluorescence, no significant spectral shift is identified. Electroluminescence of OLEDs containing HTM:Alq3 codeposited (mixed) emitter is quenched by the formation of such exciplexes. In general, the electroluminescence quantum efficiency of OLEDs correlates closely with the photoluminescence quantum yields of HTM:Alq3 codeposited films. In contrast, in an OLED containing a layered structure of HTM/Alq 3, exciplexes are less effective at quenching the electroluminescence of Alq3. Because exciplexes form only at the interface between the HTM and Alq3 layers in HTM/Alq3-based OLEDs, exciplex formation is affected not only by the electron donating nature of the HTM but also by the position of the electron-hole recombination zone and the application of an external electric field during OLED operation.

Original languageEnglish
Pages (from-to)4652-4658
Number of pages7
JournalJournal of Physical Chemistry C
Volume114
Issue number10
DOIs
Publication statusPublished - Mar 18 2010

Fingerprint

Organic light emitting diodes (OLED)
light emitting diodes
Electric fields
electric fields
Electrons
Electroluminescence
electroluminescence
Quantum yield
Quantum efficiency
Quenching
Photoluminescence
quantum efficiency
Fluorescence
emitters
Aluminum
quenching
aluminum
photoluminescence
fluorescence
shift

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

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title = "Exciplex formations at the HTL/Alq3 interface in an organic light-emitting diode: Influence of the electron-hole recombination zone and electric field",
abstract = "In this work, we investigate the influence of weak intermolecular interactions, which have not previously been carefully considered, in hole transport material (HTM)/tris(8-hydroxyquinoline)aluminum (Alq 3)-based organic light-emitting diodes (OLEDs). Although such weak interactions quench Alq3 fluorescence, no significant spectral shift is identified. Electroluminescence of OLEDs containing HTM:Alq3 codeposited (mixed) emitter is quenched by the formation of such exciplexes. In general, the electroluminescence quantum efficiency of OLEDs correlates closely with the photoluminescence quantum yields of HTM:Alq3 codeposited films. In contrast, in an OLED containing a layered structure of HTM/Alq 3, exciplexes are less effective at quenching the electroluminescence of Alq3. Because exciplexes form only at the interface between the HTM and Alq3 layers in HTM/Alq3-based OLEDs, exciplex formation is affected not only by the electron donating nature of the HTM but also by the position of the electron-hole recombination zone and the application of an external electric field during OLED operation.",
author = "Naoki Matsumoto and Chihaya Adachi",
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AU - Adachi, Chihaya

PY - 2010/3/18

Y1 - 2010/3/18

N2 - In this work, we investigate the influence of weak intermolecular interactions, which have not previously been carefully considered, in hole transport material (HTM)/tris(8-hydroxyquinoline)aluminum (Alq 3)-based organic light-emitting diodes (OLEDs). Although such weak interactions quench Alq3 fluorescence, no significant spectral shift is identified. Electroluminescence of OLEDs containing HTM:Alq3 codeposited (mixed) emitter is quenched by the formation of such exciplexes. In general, the electroluminescence quantum efficiency of OLEDs correlates closely with the photoluminescence quantum yields of HTM:Alq3 codeposited films. In contrast, in an OLED containing a layered structure of HTM/Alq 3, exciplexes are less effective at quenching the electroluminescence of Alq3. Because exciplexes form only at the interface between the HTM and Alq3 layers in HTM/Alq3-based OLEDs, exciplex formation is affected not only by the electron donating nature of the HTM but also by the position of the electron-hole recombination zone and the application of an external electric field during OLED operation.

AB - In this work, we investigate the influence of weak intermolecular interactions, which have not previously been carefully considered, in hole transport material (HTM)/tris(8-hydroxyquinoline)aluminum (Alq 3)-based organic light-emitting diodes (OLEDs). Although such weak interactions quench Alq3 fluorescence, no significant spectral shift is identified. Electroluminescence of OLEDs containing HTM:Alq3 codeposited (mixed) emitter is quenched by the formation of such exciplexes. In general, the electroluminescence quantum efficiency of OLEDs correlates closely with the photoluminescence quantum yields of HTM:Alq3 codeposited films. In contrast, in an OLED containing a layered structure of HTM/Alq 3, exciplexes are less effective at quenching the electroluminescence of Alq3. Because exciplexes form only at the interface between the HTM and Alq3 layers in HTM/Alq3-based OLEDs, exciplex formation is affected not only by the electron donating nature of the HTM but also by the position of the electron-hole recombination zone and the application of an external electric field during OLED operation.

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