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

Titelangaben

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. Bd. 50 (2012) Heft 5 . - S. 361-369.
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.23011

Volltext

Link zum Volltext (externe URL):

Abstract

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