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Light emitting diodes, lasers 1. Describe what physical property of a semiconductor will deem it good or...

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Physics

Light emitting diodes, lasers

1. Describe what physical property of a semiconductor will deemit good or bad for use in an LED.

2. Describe general operation and configuration of an LED, whatdetermines the emission wavelength (color).

3. Describe the role of defects in emission in terms of anenergy band diagram.

4. Define heterojunction, homojunction, epitaxy

5. Describe why lattice matching is important (broadly)

6. Describe why LED emission does not occur at a singlewavelength, and how you expect this to change with temperature

7. Describe the general operation of a laser and the concept ofpopulation inversion

8. Describe why the linewidth of a laser is more narrow thanthat of a light emitting diode

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