Field Emission of Nanostructured AlQ3 Amorphous Film and the Heat Treatment Effect
C-P Cho and T-P Perng
National Tsing Hua University, TW
field emission, AlQ3, thin film, heat treatment
There has been a particular interest in tris-(8-hydroxyquinoline) aluminum (AlQ3)-based devices for the development of large-area displays due to the unique properties such as excellent flexibility, high photoconductivity, and nonlinear optical behavior. It is then of great interest to prepare AlQ3 nanostructures for potential applications in nano-optoelectronic devices. Previously it has been revealed that some nanostructures of AlQ3 could be synthesized, and some optoelectronic properties of them have also been reported elsewhere. The amorphous AlQ3 thin film with nanostructured protrusions on the surface could be fabricated by vapor condensation. A heat treatment was subsequently performed on this amorphous film. The highly crystalline AlQ3 obtained from heat treatment also revealed field emission character, but much worse than that of amorphous thin film. Apparently, the field emission property is quite related to the crystallinity, and increased crystallinity is detrimental to field emission.
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Nanotech 2005 Conference Program Abstract