title: Low-voltage, high-brightness and deep-red light-emitting electrochemical cells (LECs) based on new ruthenium(ii) phenanthroimidazole complexes.
abstract: Light-Emitting Electrochemical Cells (LECs) with a simple device structure ITO/Ru complex/Ga:In were prepared by using heteroleptic ruthenium(ii) complexes containing 2-(2-hydroxyphenyl)-1-(4-bromophenyl)-1h-imidazo[4,5-f][1,10]phenanthroline (hpbpip) as the π-extended ligand. After ancillary ligand modification, the [Ru(hpbpip)(dmbpy)2](ClO4)2 complex shows a deep red electroluminescence emission (2250 cd m(-2) at 6 V) centered at 685 nm, 65 nm red-shifted compared to the [Ru(bpy)3](ClO4)2 benchmark red-emitter at a very low turn voltage (2.6 V), demonstrating its potential for low-cost deep-red light sources. Moreover, the PL quantum yield of the [Ru(hpbpip)(bpy)2](ClO4)2 complex was revealed to be higher (0.121) than the benchmark standard [Ru(bpy)3](2+) (0.095).
authors.affiliation: Chemistry Department, University of Zanjan, Zanjan, Iran. shahroos@znu.ac.ir.
authors.forename: Babak
authors.initials: B
authors.lastname: Nemati Bideh
authors.affiliation: Group for Molecular Engineering of Functional Materials, Ecole Polytechnique Federale de Lausanne Valais Wallis, Rue de l'Indutrie 17, 1950 Sion, Valais, Switzerland. mdkhaja.nazeeruddin@epfl.ch.
authors.forename: Cristina
authors.initials: C
authors.lastname: Roldán-Carmona
authors.affiliation: Chemistry Department, University of Zanjan, Zanjan, Iran. shahroos@znu.ac.ir.
authors.forename: Hashem
authors.initials: H
authors.lastname: Shahroosvand
authors.affiliation: Group for Molecular Engineering of Functional Materials, Ecole Polytechnique Federale de Lausanne Valais Wallis, Rue de l'Indutrie 17, 1950 Sion, Valais, Switzerland. mdkhaja.nazeeruddin@epfl.ch.
authors.forename: Mohammad Khaja
authors.initials: MK
authors.lastname: Nazeeruddin