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J. E. Lilienfeld
""Julius Edgar Lilienfeld (1881-1963).jpg
Born (1882-04-18)April 18, 1882
"Lemberg, Galicia, "Austro-Hungarian Empire
Died August 28, 1963(1963-08-28) (aged 81)
"Charlotte Amalie, Virgin Islands, "U.S.
Residence Austria-Hungary
"United States
Nationality German
Citizenship "Austro-Hungarian (1882-1934)
"American (1934-1963)
Alma mater "Friedrich-Wilhelms-Universität
Known for "MOSFET
"Electrolytic capacitor
Scientific career
Fields "Physicist and "Electronic engineer
Institutions "Leipzig University
Amrad, Inc
Ergon Research Laboratories
"Doctoral advisor "Max Planck
"Emil Warburg
Other academic advisors "Jacobus Henricus van 't Hoff
""Julius Lilienfeld signature.png

Julius Edgar Lilienfeld (April 18, 1882 – August 28, 1963) was a Jewish "Austro-Hungarian-born German-American physicist and electronic engineer, credited with the first patents on the "field-effect transistor (FET) (1925) and "electrolytic capacitor (1931). Because of his failure to publish articles in learned journals and because high-purity semiconductor materials were not available yet, his FET patent never achieved fame, causing confusion for later inventors.[1]


Early life[edit]

Lilienfeld was born in Lemberg in "Austria-Hungary (now called "Lviv in "Ukraine).


Between 1900 and 1904 Lilienfeld studied at the "Friedrich-Wilhelms-Universität (renamed Humboldt University in 1949), in "Berlin, where he received his Ph.D. on February 18, 1905. In 1905 he started work at the physics institute at "Leipzig University as an untenured professor.


Lilienfeld's early career, at the University of Leipzig, saw him conduct important early work on electrical discharges in "vacuum", between metal electrodes, from about 1910 onwards.[2] His early passion was to clarify how this phenomenon changed as vacuum preparation techniques improved. More than any other scientist, he was responsible for the identification of "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 was explained by "Fowler and "Nordheim in 1928.

Lilienfeld moved to the United States in 1921 to pursue his patent claims, resigning his professorship at Leipzig to stay permanently in 1926. In 1928 he began working at Amrad in "Malden, Massachusetts, later called Ergon Research Laboratories owned by Magnavox, which closed in 1935.[1]

In the United States Lilienfeld did research on anodic aluminum oxide films, patenting the "electrolytic capacitor in 1931, the method continuing to be used throughout the century. He also invented an ""FET-like" transistor, filing several patents describing the construction and operation of transistors, as well as many features of modern transistors. (US patent #1,745,175[3] for an FET-like transistor was granted January 28, 1930.)[4] When "Brattain, "Bardeen, and their colleague chemist Robert Gibney tried to get patents on their earliest devices, most of their claims were rejected due to the Lilienfeld patents.[5]

The optical radiation emitted when electrons strike 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.[6][7][8]

The American Physical Society has named one of its major prizes after Lilienfeld.

Personal life[edit]

Lilienfeld married an American, Beatrice Ginsburg, in New York City on May 2, 1926. They lived in "Winchester, Massachusetts, where Lilienfeld was director of the Ergon Research Laboratories in "Malden, Massachusetts, becoming a United States citizen in 1934. In 1935 after it closed he and his wife built a house on "St. Thomas in the U.S. Virgin Islands in hope of escaping an allergy associated with wheat fields, from which Lilienfeld had suffered for most of his life. Lilienfeld frequently traveled between St. Thomas and various mainland locations and continued to test new ideas and patent the resulting products.

Lilienfeld's patents[edit]

See also[edit]


  1. ^ a b American Dictionary of National Biography: Supplement 2 by Mark C. Carnes, 2005
  2. ^ "A Very Early Conception of a Solid State Device". IEEE Global History Network. IEEE. Retrieved 21 July 2011. 
  3. ^ U.S. Patent 1,745,175 Method and apparatus for controlling electric currents
  4. ^ Thomas H. Lee, The design of CMOS radio-frequency integrated circuits. Cambridge University Press, 2004 ,p.167ff
  5. ^ Joel N. Shurkin (8 January 2008). Broken genius: the rise and fall of William Shockley, creator of the electronic age. Palgrave Macmillan. pp. 116–. "ISBN "978-0-230-55192-3. Retrieved 10 September 2011. 
  6. ^ J.E. Lilienfeld (1919). "Die sichtbare Strahlung des Brennecks von Röntgenröhren". Physikalische Zeitschrift. 20 (12): 280. 
  7. ^ Boersch, Hans; Radeloff, C.; Sauerbrey, G. (1961). "Über die an Metallen durch Elektronen ausgelöste sichtbare und ultraviolette Strahlung". Zeitschrift für Physik A (in German). 165 (4): 464–484. "Bibcode:1961ZPhy..165..464B. "doi:10.1007/BF01381902. 
  8. ^ Boersch, Hans; Radeloff, C.; Sauerbrey, G. (1961). "Experimental detection of transition radiation". Phys. Rev. Lett. 7 (2): 52–54. "Bibcode:1961PhRvL...7...52B. "doi:10.1103/PhysRevLett.7.52. 

External links[edit]

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