RT info:eu-repo/semantics/article
T1 Highly stable and efficient light-emitting electrochemical cells based on cationic iridium complexes bearing arylazole ancillary ligands
A1 Martínez Alonso, Marta
A1 Cerdá, Jesús .
A1 Momblona, Cristina .
A1 Pertegás, Antonio .
A1 Junquera Hernández, José M. .
A1 Heras Vidaurre, Aránzazu
A1 Rodríguez, Ana M. .
A1 Espino Ordóñez, Gustavo
A1 Bolink, Henk .
A1 Ortí, Enrique .
K1 Química analítica
K1 Chemistry, Analytic
AB A series of bis-cyclometalated iridium(III)complexes of general formula [Ir(ppy)2(N∧N)][PF6] (ppy−= 2-phenylpyridinate; N∧N = 2-(1H-imidazol-2-yl)pyridine(1), 2-(2-pyridyl)benzimidazole (2), 1-methyl-2-pyridin-2-yl-1H-benzimidazole (3), 2-(4′-thiazolyl)benzimidazole (4), 1-methyl-2-(4′-thiazolyl)benzimidazole (5)) is reported, andtheir use as electroluminescent materials in light-emittingelectrochemical cell (LEC) devices is investigated. [2][PF6]and [3][PF6] are orange emitters with intense unstructuredemission around 590 nm in acetonitrile solution. [1][PF6],[4][PF6], and [5][PF6] are green weak emitters withstructured emission bands peaking around 500 nm. Thedifferent photophysical properties are due to the effect that thechemical structure of the ancillary ligand has on the nature of the emitting triplet state. Whereas the benzimidazole unit stabilizesthe LUMO and gives rise to a 3MLCT/3LLCT emitting triplet in [2][PF6] and [3][PF6], the presence of the thiazolyl ringproduces the opposite effect in [4][PF6] and [5][PF6] and the emitting state has a predominant 3LC character. Complexes with3MLCT/3LLCT emitting triplets give rise to LEC devices with luminance values 1 order higher than those of complexes with3LC emitting states. Protecting the imidazole N−H bond with a methyl group, as in complexes [3][PF6] and [5][PF6], showsthat the emissive properties become more stable. [3][PF6] leads to outstanding LECs with simultaneously high luminance (904cd m−2), efficiency (9.15 cd A−1), and stability (lifetime over 2500 h).
PB American Chemical Society
SN 0020-1669
YR 2017
FD 2017-09
LK http://hdl.handle.net/10259/4939
UL http://hdl.handle.net/10259/4939
LA eng
NO Spanish Ministry of Economy andCompetitiveness (MINECO) of Spain (projects CTQ2014-58812-C2-1-R, MAT2014-55200, CTQ2014-55583-R,CTQ2014-61914-EXP, CTQ2015-71955-REDT, CTQ2015-70371-REDT, CTQ2015-71154-P, and Unidad de ExcelenciaMarıá de Maeztu MDM-2015-0538), European Feder funds(CTQ2015-71154-P), Obra Social “la Caixa” (OSLC-2012-007), Junta de Castilla y León (BU033-U16), and GeneralitatValenciana (Prometeo2016/135)
DS Repositorio Institucional de la Universidad de Burgos
RD 25-abr-2024