White electroluminescence of lanthanide complexes resulting from exciplex formation

被引：48

作者：

Zucchi, Gael ^{[1
]}

Jeon, Taewoo

Tondelier, Denis

Aldakov, Dmitry

Thuery, Pierre ^{[1
]}

Ephritikhine, Michel ^{[1
]}

Geffroy, Bernard ^{[2
]}

机构：

[1] CEA Saclay, CNRS, UMR 3299, IRAMIS,SIS2M,CEA, F-91191 Gif Sur Yvette, France

[2] Ecole Polytech, CNRS, UMR 7647, CEA LITEN,Lab Phys Interfaces & Couches Minces, F-91128 Palaiseau, France

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2010年 / 20卷 / 11期

关键词：

LIGHT-EMITTING-DIODES; EUROPIUM COMPLEX; IRIDIUM COMPLEXES; METAL-COMPLEXES; DEVICES; ELECTROPHOSPHORESCENCE; 2,2'-BIPYRIMIDINE; LUMINESCENCE; EMISSION; LEDS;

D O I：

10.1039/b921740a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Bimetallic complexes of the visible-emitting Eu3+, Tb3+ and Sm3+ ions with 2,2'-bipyrimidine (bpm) and acetylacetonate (acac) ligands have been synthesized and crystallographically characterized. They have been found to be isomorphous with the general formula [{Ln(acac)(3)}(2)(mu-bpm)] (Ln = Eu, 1; Ln = Tb, 2; Ln = Sm, 3). Their X-ray crystal structure shows that the aromatic polyamine ligand bridges the two metal ions. These volatile complexes have been thermally evaporated to be introduced in multilayer OLEDs as dopants. In addition to the electroluminescence of the lanthanide ion, a broad emission in the yellow-green region was obtained. This resulted in white electroluminescence of the devices doped with 1 or [{Eu(tta)(3)}(2)(mu-bpm)] (4) complexes (tta = 2-thenoyltrifluoromethanesulfonato). This broad emission is shown to be caused by the formation of an exciplex between the dopant and the host matrix within the emitting layer of the devices.

引用

页码：2114 / 2120

页数：7

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