The Foundations of the Laser Diode
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Discovery of the LEDDiscovery of the LED ••
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Overlooked BeginningsOverlooked Beginnings ••
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The Glowing DiodeThe Glowing Diode
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(1927)(1927)
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Band Theory of SolidsBand Theory of Solids
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Schottky DiodeSchottky Diode
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Band Diagram of a Schottky DiodeBand Diagram of a Schottky Diode
vc EE hc −
Why LEDWhy LED’’s?s?
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LED SpectrumLED Spectrum
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Laser Diode
The SolutionThe Solution
HeterostructuresHeterostructures
HeterojunctionHeterojunction
Thank You
References (1) http://hyperphysics.phy-astr.gsu.edu/Hbase/solids/
(2) S. M. Sze, Physics of Semiconductor Devices, 2nd ed., John Wiley & Sons, New York, 1981 (3) E. Fred Schubert, Light-Emitting Diodes, 2nd ed., Cambridge University Press, New York, 2006
(4) Mitsuo Fukuda, Optical Semiconductor Devices, John Wiley & Sons, New York, 1999 (5) B Van Zeghbroeck, http://ece-www.colorado.edu/~bart/book/movie/movie1.htm, 2004
Overlooked Beginnings
The Solution