Highly Stable Red-Light-Emitting Electrochemical Cells.
The synthesis and characterization of a series of new cyclometalated iridium(III) complexes [Ir(ppy)2(N∧N)][PF6] in which Hppy = 2-phenylpyridine and N∧N is (pyridin-2-yl)benzo[d]thiazole (L1), 2-(4-(tert-butyl)pyridin-2-yl)benzo[d]thiazole (L2), 2-(6-phenylpyridin-2-yl)benzo[d]thiazole (L3), 2-(4-(tert-butyl)-6-phenylpyridin-2-yl)benzo[d]thiazole (L4), 2,6-bis(benzo[d]thiazol-2-yl)pyridine (L5), 2-(pyridin-2-yl)benzo[d]oxazole (L6), or 2,2'-dibenzo[d]thiazole (L7) are reported. The single crystal structures of [Ir(ppy)2(L1)][PF6]·1.5CH2Cl2, [Ir(ppy)2(L6)][PF6]·CH2Cl2, and [Ir(ppy)2(L7)][PF6] have been determined. The new complexes are efficient red emitters and have been used in the active layers in light-emitting electrochemical cells (LECs). The effects of modifications of the 2-(pyridin-2-yl)benzo[d]thiazole ligand on the photoluminescence and LEC performance have been examined. Extremely stable red-emitting LECs are obtained, and when [Ir(ppy)2(L1)][PF6], [Ir(ppy)2(L2)][PF6], or [Ir(ppy)2(L3)][PF6] are used in the active layer, device lifetimes greater than 1000, 6000, and 4000 h, respectively, are observed.
Department of Chemistry, University of Basel , Spitalstrasse 51, CH-4056 Basel, Switzerland.
Cathrin D
CD
Ertl
Instituto de Ciencia Molecular, Universidad de Valencia , C/Catedrático José Beltrán 2, ES-46980 Paterna (Valencia), Spain.
Cristina
C
Momblona
Instituto de Ciencia Molecular, Universidad de Valencia , C/Catedrático José Beltrán 2, ES-46980 Paterna (Valencia), Spain.
Antonio
A
Pertegás
Instituto de Ciencia Molecular, Universidad de Valencia , C/Catedrático José Beltrán 2, ES-46980 Paterna (Valencia), Spain.
José M
JM
Junquera-Hernández
Instituto de Ciencia Molecular, Universidad de Valencia , C/Catedrático José Beltrán 2, ES-46980 Paterna (Valencia), Spain.
Maria-Grazia
MG
La-Placa
Department of Chemistry, University of Basel , Spitalstrasse 51, CH-4056 Basel, Switzerland.
Alessandro
A
Prescimone
Instituto de Ciencia Molecular, Universidad de Valencia , C/Catedrático José Beltrán 2, ES-46980 Paterna (Valencia), Spain.
Enrique
E
Ortí
Department of Chemistry, University of Basel , Spitalstrasse 51, CH-4056 Basel, Switzerland.
Catherine E
CE
Housecroft
Department of Chemistry, University of Basel , Spitalstrasse 51, CH-4056 Basel, Switzerland.
Edwin C
EC
Constable
Instituto de Ciencia Molecular, Universidad de Valencia , C/Catedrático José Beltrán 2, ES-46980 Paterna (Valencia), Spain.
Henk J
0000-0001-9784-6253
HJ
Bolink