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 language | English |
|---|---|
| Pages (from-to) | 4652-4658 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry C |
| Volume | 114 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Mar 18 2010 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
Cite this
Exciplex formations at the HTL/Alq3 interface in an organic light-emitting diode : Influence of the electron-hole recombination zone and electric field. / Matsumoto, Naoki; Adachi, Chihaya.
In: Journal of Physical Chemistry C, Vol. 114, No. 10, 18.03.2010, p. 4652-4658.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exciplex formations at the HTL/Alq3 interface in an organic light-emitting diode
T2 - Influence of the electron-hole recombination zone and electric field
AU - Matsumoto, Naoki
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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UR - http://www.scopus.com/inward/citedby.url?scp=77949430420&partnerID=8YFLogxK
U2 - 10.1021/jp9121062
DO - 10.1021/jp9121062
M3 - Article
AN - SCOPUS:77949430420
VL - 114
SP - 4652
EP - 4658
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 10
ER -