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24 April 1998 STM electroluminescence probes of metallic and polymeric materials
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The STM-electroluminescence technique is shown to be a valuable tool for characterizing optoelectronic properties and understanding structure-function relationships in heterogenous or disordered material on nanometer length scales. The intensity of photon emission induced by tunneling electrons from rough Au films is found to depend on the surface feature size. This size-dependent photon emission yield is shown to agree with the theoretically predicted trend based on the inelastic electron tunneling mechanism. Correlated STM 'topography' and electroluminescence measurement of polypyridine (PPy) showed electroluminescence almost exclusively result from low conductivity regions of the film .This anomalous correlation between STM topography and photon emission maps of PPy films is interpreted as the consequence of the spatial variation of the carrier mobility. The results have important implications for understanding the underlying physics of electroluminescence of polymer films as well as for development of optoelectronic devices based on polymeric materials.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yish-Hann Liau and Norbert F. Scherer "STM electroluminescence probes of metallic and polymeric materials", Proc. SPIE 3273, Laser Techniques for Condensed-Phase and Biological Systems, (24 April 1998);

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