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On the formation mechanism for electrically generated exciplexes in a carbazole–pyridine copolymer

Title data

Hayer, Anna ; van Regemorter, Tanguy ; Höfer, Bianca ; Mak, Chris S. K. ; Beljonne, David ; Köhler, Anna:
On the formation mechanism for electrically generated exciplexes in a carbazole–pyridine copolymer.
In: Journal of Polymer Science Part B: Polymer Physics. Vol. 50 (2011) Issue 5 . - pp. 361-369.
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.23011

Official URL: Volltext

Abstract in another language

Although carbazole-containing copolymers are frequently used as hole-transporting host materials for polymer organic light-emitting diodes (OLEDs), they often suffer from the formation of undesired exciplexes when the OLED is operated. The reason why exciplexes sometimes form for electrical excitation, yet not for optical excitation is not well understood. Here, we use luminescence measurements and quantum chemical calculations to investigate the mechanism of such exciplex formation for electrical excitation (electroplex formation) in a carbazole–pyridine copolymer. Our results suggest that the exciplex is formed via a positively charged interchain precursor complex. This complex is stabilized by interactions that involve the nitrogen lone pairs on both chain segments. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: charge transfer;
light-emitting diodes (LED);
luminescence;
photophysics;
quantum chemistry;
UV–vis spectroscopy
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 13 Feb 2015 12:01
Last Modified: 13 Feb 2015 12:01
URI: https://eref.uni-bayreuth.de/id/eprint/6721