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In a light-emitting diode (LED), which is used in displays on electronic equipment, watches, and clocks, a voltage is imposed across an n-p semiconductor junction. The electrons on the n side combine with the holes on the p side and emit light at the frequency of the band gap. This process can also be described as the emission of light as electrons fall from levels in the conduction band to empty levels in the valence band. It is the reverse of the production of electric current by illumination of a semiconductor. Many LEDS are made from semiconductors that have the general composition GaAs1-„Pr. When x is varied between 0 and 1, the band gap changes and, with it, the color of light emitted by the diode. When x = 0.4, the band gap is 2.9 × 10-19 J. Determine the wavelength and color of the light emitted by this LED.

In a light-emitting diode (LED), which is used in displays on electronic equipment, watches, and clocks, a voltage is imposed across an n-p semiconductor junction. The electrons on the n side combine with the holes on the p side and emit light at the frequency of the band gap. This process can also be described as the emission of light as electrons fall from levels in the conduction band to empty levels in the valence band. It is the reverse of the production of electric current by illumination of a semiconductor. Many LEDS are made from semiconductors that have the general composition GaAs1-„Pr. When x is varied between 0 and 1, the band gap changes and, with it, the color of light emitted by the diode. When x = 0.4, the band gap is 2.9 × 10-19 J. Determine the wavelength and color of the light emitted by this LED.

Modern Physics
Modern Physics
3rd Edition
ISBN:9781111794378
Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Chapter12: The Solid State
Section: Chapter Questions
Problem 1P
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In a light-emitting diode (LED), which is used in displays on electronic equipment, watches, and clocks, a voltage is imposed across an n-p semiconductor junction. The electrons on the n side combine with the holes on the p side and emit light at the frequency of the band gap. This process can also be described as the emission of light as electrons fall from levels in the conduction band to empty levels in the valence band. It is the reverse of the production of electric current by illumination of a semiconductor. Many LEDS are made from semiconductors that have the general composition GaAs1-„Pr. When x is varied between 0 and 1, the band gap changes and, with it, the color of light emitted by the diode. When x = 0.4, the band gap is 2.9 × 10-19 J. Determine the wavelength and color of the light emitted by this LED.
Transcribed Image Text:In a light-emitting diode (LED), which is used in displays on electronic equipment, watches, and clocks, a voltage is imposed across an n-p semiconductor junction. The electrons on the n side combine with the holes on the p side and emit light at the frequency of the band gap. This process can also be described as the emission of light as electrons fall from levels in the conduction band to empty levels in the valence band. It is the reverse of the production of electric current by illumination of a semiconductor. Many LEDS are made from semiconductors that have the general composition GaAs1-„Pr. When x is varied between 0 and 1, the band gap changes and, with it, the color of light emitted by the diode. When x = 0.4, the band gap is 2.9 × 10-19 J. Determine the wavelength and color of the light emitted by this LED.
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