Career
Lilienfeld's early career was at the University of Leipzig, where he conducted important early work on electrical discharges in "vacuum", between metal electrodes, from about 1910 onwards. His early passion was to clarify how the phenomena changed as vacuum preparation techniques improved. More than any other scientist, he was responsible for the identification of (presently named) field electron emission as a separate physical effect. (He called it "auto-electronic emission", and was interested in it as a possible electron source for miniaturised X-ray tubes, in medical applications.) Lilienfeld was responsible for the first reliable account in English of the experimental phenomenology of field electron emission, in 1922. The effect itself was explained by Fowler and Nordheim in 1928.
Lilienfeld moved to the United States in the early 1920s, originally in order to defend patents he possessed, and then made a scientific/industrial career there.
Among other things, he invented an "FET-like" transistor and the electrolytic capacitor in the 1920s. He filed several patents describing the construction and operation of transistors as well as many features of modern transistors. (US patent #1,745,175 for an FET-like transistor was granted January 28, 1930.) When Brattain, Bardeen, and Robert Gibney tried to get patents on their earliest devices, most of their claims were rejected due to the Lilienfeld patents.
The optical radiation emitted when electrons are hitting a metal surface is named "Lilienfeld radiation" after he first discovered it close to X-ray tube anodes. Its origin is attributed to the excitation of plasmons in the metal surface.
The American Physical Society has named one of its major prizes after Lilienfeld.
Read more about this topic: Julius Edgar Lilienfeld
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