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When is a light-emitting diode a receiver?

When is a light-emitting diode a receiver?

Item no.: P1418401

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Performing this experiment is not difficult and it can be carried out in daylight as any light interference is shielded by the tube.


  • Specified for the requirements of the german final secondary-school examinations
  • Especially for secondary schools
  • Quantum and wave optics in a student experiment


When is an LED a receiver? A light emitting diode or LED is an electronic semiconductor component. If a current flows through the LED in the conduction direction it emits light. Physically, semiconductors are characterised by a band gap, i.e. an energetically forbidden zone for electrons. This energy gap between the valence band and the conducting band essentially determines the electrical and optical properties. E.g. a photon whose energy is less than the band gap energy of the semiconductor cannot create an electron-hole pair. In this experiment you will determine the size of the band gaps of the LED relative to one other.

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p1418401e.pdf Experiment guide, English 295.04 KB

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