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- Title
Push-Pull Design of Bis(tridentate) Ruthenium(II) Polypyridine Chromophores as Deep Red Light Emitters in Light-Emitting Electrochemical Cells.
- Authors
Breivogel, Aaron; Park, Myeongjin; Lee, Donggu; Klassen, Stefanie; Kühnle, Angelika; Lee, Changhee; Char, Kookheon; Heinze, Katja
- Abstract
Light-emitting electrochemical cells (LECs) with a simple device structure were prepared by using heteroleptic bis(tridentate) ruthenium(II) complexes [ 1](PF6)2-[ 3](PF6)2 as emitters. The push-pull substitution shifts the emission energy to low energy, into the NIR region. The devices emit deep red light up to a maximum emission wavelength of 755 nm [CIE (International Commission on Illumination) coordinates: x = 0.731, y = 0.269 for [ 3](PF6)2], which, to the best of our knowledge, is the lowest emission energy for LECs containing bis(tridentate) ruthenium(II) complexes. A device structure of ITO/PEDOT:PSS/ruthenium(II) complex/Ag was used, and the thickness of the emitting layer was measured by AFM [ITO: indium tin oxide, PEDOT: poly(3,4-ethylenedioxythiophene), PSS: poly(styrenesulfonate), AFM: atomic force microscopy]. To enhance the external quantum efficiency (EQE), cells were fabricated with and without poly(methyl methacrylate) (PMMA) as additive in the emitting layer.
- Subjects
RUTHENIUM compounds; LIGHT emitting electrochemical cells; CHROMOPHORES; POLYPYRIDINES; MOLECULAR electronics; LUMINESCENCE; LIGANDS (Chemistry)
- Publication
European Journal of Inorganic Chemistry, 2014, Vol 2014, Issue 2, p288
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201301226