Optoelectric Devices

Light• Electromagnetic radiation visible to human

eye• Frequency range

300 to 300,000,000 gigahertz• Visible region

400,000 to 750,000 gigahertz

Figure 26-1. Photo cell.

Figure 26-3. Construction of a solar cell.

Figure 26-5. PN junction photodiode.

Figure 26-6. PIN junction photodiode.

Figure 26-7. Photodiode package.

Figure 26-9. Voltage divider using a photodiode.

Figure 26-12. Darkness-on DC switch.

Figure 26-13. LED construction.

Figure 26-14. Common LED packages.

Figure 26-19. Commercial optical coupler.

Semiconductor devices that interact with light• Light-detection devices• Light-conversion devices• Light-emitting devices

Light is electromagnetic radiation that is visible to the human eye

Light-sensitive devices include photo cells, solar cells, photodiodes, and phototransistors

Light-emitting devices include the LED (light-emitting diode)

An optical coupler combines a light-sensitive device with a light-emitting device