Using photon emissions from individual molecules of silver, researchers at the Georgia Institute of Technology have created what may be the world's smallest electroluminescent light source.  The emission blinks on and off, a characteristic of single molecule emissions.  The colors vary due to differences in size of the molecules. 

Believed to be the first demonstration of electroluminescence from individual molecules, the work could lead to new types of nanometer-scale optical interconnects, high-resolution optical microscopy, nanometer-scale lithography and other applications that require very small light sources. And because single molecules are known to emit one photon at a time, the technique could ultimately be the basis for high-efficiency quantum information processing and cryptography.
 

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