This article describes advances in thermionic and photo-emission materials and applications dating back to the work on thermionic emission by Guthrie (1873) and the photoelectric effect by Hertz (1893). 2Birck Nanotechnology Center, School of Physics, Purdue University, West Lafayette, IN, USA.1Birck Nanotechnology Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA.
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