Additional Problem

An LED is created with a semiconductor that has the energy bands and gaps:

1. What is the energy gap of the semiconductor?
2. Determine, using the diagram above, the range of energies emitted by electrons in this solid.
3. Describe the spectrum of visible light emitted by this LED.
4. Use the LED Spectography computer program to check your answers.

Hint: The range of visible light goes from 1.6 eV (red) to 3.1 eV (violet).