Toward functional π-conjugated organophosphorus materials: Design of phosphole-based oligomers for electroluminescent devices

Hai-Ching Su, Omrane Fadhel, Chih Jen Yang, Ting Yi Cho, Claire Fave, Muriel Hissler, Chung Chih Wu*, Régis Réau

*Corresponding author for this work

Research output: Contribution to journalArticle

214 Scopus citations

Abstract

The photophysical, electrochemical, and optoelectronic properties of conjugated systems incorporating dibenzophosphole or phosphole moieties are described. Dibenzophosphole derivatives are not suitable materials for OLEDs due to their weak photoluminescence (PL) in the solid state and the instability of the devices. Variation of the substitution pattern of phospholes and chemical modification of their P atoms afford thermally stable derivatives, which are photo- and electroluminescent. Comparison of the optical properties of solution and thin film of thioxophospholes shows that these compounds do not form aggregates in the solid state. This property, which is also supported by an X-ray diffraction study of three novel derivatives, results in an enhancement of the fluorescence quantum yields in the solid state. In contrast, (phosphole)gold(I) complexes exhibit a broad emission in thin film, which is due to the formation of aggregates. Single- and multilayer OLEDs using these P derivatives as the emissive layer have been fabricated. The emission color of these devices and their performances vary with the nature of the P material. Interestingly, di(2-thienyl)thiooxophosphole is an efficient host for the red dopant DCJTB, and devices using the gold complexes have broad emission spectra.

Original languageEnglish
Pages (from-to)983-995
Number of pages13
JournalJournal of the American Chemical Society
Volume128
Issue number3
DOIs
StatePublished - 25 Jan 2006

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