summary of Optoelectric Devices

summary

● Semiconductor devices that interact with light can be classified as light-detection devices, light- conversion devices, or light-emitting devices.

● Light is electromagnetic radiation that is visible to the human eye.

● The frequency range of light is as follows:

● Infrared light—less than 400,000 gigahertz

● Visible light—400,000 to 750,000 gigahertz

● Ultraviolet light—greater than 750,000 gigahertz

● Light-sensitive devices include photocells, solar cells, photodiodes, and phototransistors.

● The LED (light-emitting diode) is a light-emitting device.

● LEDs are available in many colors.

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

● The schematic symbols for light-sensitive devices are as shown here:

● Photocell

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