67.2: Invited Paper: High-Efficiency Phosphorescent Polymer LEDs

Abstract

In this paper, we present the results of our ongoing work towards achieving high-efficiency high-energy (i.e. green and blue) phosphorescent polymer light-emitting diodes (pLEDs). Green phosphorescent pLEDs have been prepared with efficiencies that are comparable to those of state-of-the art OLEDs based on small molecules (smOLEDs), and the first steps towards extending these concepts to blue phosphorescent pLEDs are shown.

Solution-processed bilayer photovoltaic devices with nematic liquid crystals

“…The IP of 5 is significantly lower than that of 2 as a result of the electron-donating nature of the nitrogen atom of the carbazole unit, which replaces the fluorene moiety. [25,33,34] Most donor-acceptor materials have similar values of Eg ec and Eg opt because the charge transfer transitions originate between the HOMO and LUMO. [35,36] Here Eg ec is significantly smaller than Eg opt , providing confirmation that optical transitions do not couple energy states localized on the donor and acceptor regions of the molecules.…”