Introduction. AlGaInP Material Properties. AlGaInP LED Device Design. Epitaxial Growth. Device Fabrication and Packaging. AlGaInP Device Performance. Conclusions.
The volume "Electroluminescence" for the first time covers (almost) all kinds of electroluminescence. In its broadest sense electroluminescence is the conversion of electric power into optical power - light. The way, in which this goal is accomplished, and the goal, the application itself, has varied over time. First reported in the scientific literature in 1936 by the French physicist G. Destriau, it was for quite some decades the glow of a powder embedded in a resin under the action of an alternating voltage. The dream of "cold light" for illumination was born in the 50s. Modern semiconductor technology, using p-n juntion, but not in silicon or germanium, but in GaAs and GaP, created in the 70s the tiny Light emitting Diodes. Today about 50 for every human being have been sold. They are everywhere for signaling and display of numbers and short texts. And they are at the verge of an era of solid state lighting, replacing gradually incandescent bulbs and fluorescent lamps. In the first half of 1999 several j oint ventures between giants of the lighting industry and manufacturers of LEDs became known, including names as Philips, General Electric, Osram and Hewlett Packard, Emtron and Siemens, The reason, blue light emission of LEDs, for so long researched for unsuccessfully, has been achieved. Signaling, lighting will be the domains of LEDs in the next decades - a good start in the 21st millenium. But a the same time a paradigm shift in the display industry could come about. Dominated for the last 10 years by Liquid Crystal Displays (LCD), which are reflecting or transmitting light from extra light sources, self-emitting displays will challenge this dominance. Capable of handling very complex information by multiplexed addressing of millions of picture elements (pixels) in full color electroluminescence in the form of Organic LEDs and Thin Film Electroluminescence is gaining markets. Both technologies, much less matured than LED, incorporate
Scientists and engineers in any field of electroluminescence; semiconductor engineers; application engineers in lighting, signaling, instrumentation, information displays, measuring, communication technology, and bio-medicine; materials scientists and engineers; college and university teachers, professors; business developers; technicians in all the above mentioned disciplines; interested amateurs.
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- © Academic Press 2000
- 15th October 1999
- Academic Press
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WILLARDSON CONSULTING SPOKANE, WASHINGTON
Fraunhofer-Institut für Solare Energiesysteme ISE, Freiburg, Germany
Dr. Gerd Mueller earned a Masters degree in physics and mathematics, and a Ph.D. in physics, from Humboldt University. Currently a Department Scientist at the Communications and Optics Laboratory of Hewlett Packard Laboratories, he is also an author of monographs and chapters in scientific books and of about 90 scientific papers, and holds 30 patents.
Hewlett Packard Laboratories, Freemont, California, U.S.A.