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Electronic structure calculations for hole-transporting triphenylamine derivatives in polymer light-emitting diodes

: Kröner, D.; Krüger, H.; Thesen, M.W.


Macromolecular theory and simulations 20 (2011), No.9, pp.790-805
ISSN: 1022-1344
Journal Article
Fraunhofer IAP ()

Hole-transporting polymers based on polyethene-triphenylamine derivatives are investigated with respect to their UV/Vis spectra. Two substituents, N-phenyl-1-naphthylamine and carbazole, are examined as their respective polymer light-emitting diodes (PLEDs) show very different luminous efficiencies. In order to identify the origin of these phenomena electronic structure calculations based on TD-DFT were performed using monomer models of the hole-transporting polymers. In experiment these hole-transporting polymers show very specific differences in their absorption and emission (fluorescence and phosphorescence) spectra. The analysis of the simulated absorption and emission spectra, the MOs as well as the ground and excited state geometries give explanations for the different optical performances of the corresponding PLEDs. Polymer light-emitting diodes show very different luminous efficiencies depending on the chemical structure of the used hole-transporting polymers (H TP). For two different HTPs the absorption and emission spectra were simulated in order to identify structural and electronic differences that can explain the differences in their luminous efficiencies in the OLED.