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

Light emitting diodes, lasers

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

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

3. Describe the role of defects in emission in terms of an energy 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 single wavelength, and how you expect this to change with temperature

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

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

Expert Solution

genius_generous answered 1 year ago

Light emitting diodes (LED) light bulbs have become required in recent years, but do they make...

Light emitting diodes (LED) light bulbs have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent light bulb costs $.39 and lasts 1,000 hours. A 15-watt LED, which provides the same light, costs $3.10 and lasts for 12,000 hours. A kilowatt-hour of electricity costs $.115. A kilowatt-hour is 1,000 watts for 1 hour. If you require a return of 11 percent and use a light fixture 500 hours per year, what is the...

The physical property that describes the speed of light within a substance is known as a....

The physical property that describes the speed of light within a substance is known as a. specific heat b. melting point c. state of mater d. none of the above

What is not a physical property of matter

What are mechanical property parameters and what are physical property parameters? What are their differences?

a) Describe an experiment that points to the particle property of light. b) Describe an experiment...

a) Describe an experiment that points to the particle property of light. b) Describe an experiment that describes the wave property of light.

what is the main property of a lens? what 2 physical parameters create this property?

1. Silicon is the main ingredient of both glass and semiconductor materials. Why are the physical...

1. Silicon is the main ingredient of both glass and semiconductor materials. Why are the physical properties of glass different from those of semiconductors? 1. The silicon atoms in semiconductors are bonded with oxygen atoms to form a crystal; in semiconductors the silicon is pure and thus forms the amorphous structure. 2. Silicon has no effect on the properties of glass and semiconductors. 3. The silicon atoms in semiconductors form a crystal; in glass they are bonded with oxygen atoms...

3. What are the implications for the semiconductor industry that silicon has a relatively good heat...

3. What are the implications for the semiconductor industry that silicon has a relatively good heat conductivity?

What physical (structural) property classifies a oligomer of catechin as a nonhydrolyzable tannin? What chemical property...

What physical (structural) property classifies a oligomer of catechin as a nonhydrolyzable tannin? What chemical property classifies catechin as a nonhydrozable tannin?

What property allowed us to observe analgesics under the UV light?

Question