Regensburg 2019 – wissenschaftliches Programm
CPP 14.5: Vortrag
Montag, 1. April 2019, 16:15–16:30, H31
Barrier Heights in Contacts to Electroluminescent Thin Films of 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline Determined by Kelvin Probe Force Microscopy — •Clemens Geis1, Georg Albrecht1, Julia Ruhl2, Jasmin Martha Herr2, Richard Göttlich2, and Derck Schlettwein1 — 1Justus-Liebig-Universität Gießen, Institut für Angewandte Physik — 2Justus-Liebig-Universität Gießen, Institut für Organische Chemie
Thin films of 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline (PCIC) were prepared by physical vapor deposition and analyzed in situ by Kelvin probe force microscopy (KPFM). As contact phases, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and poly(9-vinylcarbazole) (PVK) were used as hole conductors and bathocuproine (BCP) as electron conductor. Charge carrier injection barriers were identified, electroluminescent layer structures were prepared and effects of contact formation on radiative recombination were studied. Aside from the expected blue emission, a significantly red-shifted emission was found and assigned to electroplex formation with BCP. Using PCIC in a host-guest system within a matrix of PVK led to blue emission at improved luminescence. The studied interactions of PCIC with typical contact materials reveal the potential and limitations of PCIC as an electroluminescent material.