Functional nanostructured phosphorescent materials driven by weak closed-shell metal-metal interactions and metal-ligand coordination

Abstract

Self-assembly of organic and inorganic molecules into one-dimensional (1-D) micrometer- and nanometer-scale architectures has become a useful approach for fabrication of materials with extraordinary properties and applications. Recently, we have found that functionalized organometallic nano-wires with intriguing photoluminescent and optoelectronic properties that are directed by weak Pt°Ñ°Ñ°ÑPt interactions along the dimension of the aggregates can be readily obtained by self-assembly reactions. These platinum(II) nano-wires exhibit interesting photophysical properties, vapochromic behavior, and could be used in the fabrication of organic thin-film transistors. We have also found that thermally stable coordination polymers (with decomposition temperature up to 490 oC), employing Zn2+ or Eu3+ as template metal ions and Schiff base, terpyridine or quaterpyridine as repeating chelating units, could be easily synthesized using self-assembly reactions. These coordination polymers exhibit intense blue to red photoluminescence with quantum yields up to 0.55 in thin films. Polymer light-emitting devices (PLEDs) employing these coordination polymers as emitters give blue, green and red EL with turn-on voltage as low as 5 V and maximum efficiency up to 2.6 cd A-1. References:

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