An infrared transmitting tube, also known as an infrared LED, is a semiconductor device that converts electrical energy directly into near-infrared light (invisible to the human eye). It is commonly used in photoelectric switches, remote control systems, and IR communication circuits.

Structurally and functionally similar to standard LEDs, infrared LEDs differ by using specialized semiconductor materials such as gallium arsenide (GaAs) or aluminum gallium arsenide (GaAlAs). These components are often encapsulated in transparent, light blue, or black resin for optimal IR emission. Their reliable performance and efficiency make them essential in a wide range of electronic and automation applications.