Highly improved electroluminescence from double-layer devices based on a carbazole-functionalized europium3+ complex

Kun Yin, Hui Xu, Gaoyu Zhong, Gang Ni, Wei Huang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A novel europium complex Eu(TTA)3(CPPO)2 (1) (TTA=thenoyltrifluoroacetone, CPPO=9-[4-(diphenyl-phosphinoyl)-phenyl]-9H- carbazole) based on the phosphine oxide ligand with bipolar structure was used to fabricate double-layer devices. The strong hole injection and transport ability of 1 was proved. The luminance of 414 cd∈m-2 was achieved with the device configuration ITO/Eu(TTA)3(CPPO) 2(40 nm)/BCP (30 nm)/Mg:Ag (BCP∈=∈2,∈9-dimethyl-4, ∈7-diphenyl-1,∈10-phenanthroline), which is favorable among double-layer organic light emitting devices based on small molecular Eu 3+ complexes. The maximum current efficiency of 2.44 cd∈A -1 and external quantum efficiency of 1.55% demonstrate the potential application of 1 as a promising candidate for high-efficiency, simple-structure and pure red-emitting devices.

Original languageEnglish
Pages (from-to)595-600
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume95
Issue number2
DOIs
StatePublished - May 2009
Externally publishedYes

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