A mechanistic study of exciplex formation and efficient red light-emitting devices based on rare earth complexes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)149-154
Journal / PublicationOrganic Electronics: physics, materials, applications
Issue number2-3
Publication statusPublished - Sep 2003


The mechanisms of exciplex formation between hole-transporting material N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-diphenyl-4, 4′-diamine (TPD) and electron-transporting materials tris(dibenzoylmethanato)-mono(bathophenanthroline)-rare earth (RE(DBM) 3bath) in TPD/RE(DBM)3bath bilayer electroluminescence (EL) devices were studied. The formation process was identified by using fluorescent dye as dopant. It was found that interaction between the excited states of RE(DBM)3bath and the ground state of TPD molecules resulted in the exciplex. The recombination zone of the TPD/RE(DBM) 3bath device was proved to be mainly in the RE(DBM)3bath layer near the organic interface. On the other hand, by using dopant as efficient energy acceptor in RE-complex hosts, we found that exciplex emission was quenched thoroughly and efficient red light emission was observed, proving that RE(DBM)3bath may act as an efficient energy donor in EL devices. In the case of Eu3+ as the central ion, maximum EL efficiency and highest brightness of red light emission reached 2.6% and 2000 cd/m 2, respectively. © 2003 Elsevier B.V. All rights reserved.

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