Electroluminescence properties of systematically derivatized organic chromophores containing electron donor and acceptor groups

Amitava Patra, Michael Pan, Christopher S. Friend, Tzu Chau Lin, Alexander N. Cartwright, Paras N. Prasad, Ryszard Burzynski

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

We present electroluminescent (EL) properties of new blue-green organic dyes. The molecular structures of these dyes are based on 2,7-divinyl-9,9-bis(tert-butyl)fluorene, a π-electron bridge, end-capped with electron donor (D) and/or electron acceptor (A) group(s) to form D-π-A, D-π-D, and A-π-A structures. The donor group is a triphenylamine, and the acceptor group is a diphenyloxadiazole. We studied EL properties of these dyes in a single-layer EL device having the following structure: ITO/PVK:DYE/Ca/Al. We found that both the wavelength of maximum emission and the threshold of EL depend on the structure and the concentration of the dye. Among the structure reported here, the D-π-A dye shows the highest EL performance, exhibiting a brightness of 498 cd/m2 at an applied voltage of 25 V.

Original languageEnglish
Pages (from-to)4044-4048
Number of pages5
JournalChemistry of Materials
Volume14
Issue number10
DOIs
StatePublished - 1 Oct 2002

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