Infrared emitting tube (IRLED) is also called infrared emitting diode, which belongs to the diode category. It is a light-emitting device that can directly convert electrical energy into near-infrared light (invisible light) and radiate out. It is mainly used in various photoelectric switches, touch screens and remote control transmitter circuits. The structure and principle of the infrared emitting tube are similar to those of ordinary light emitting diodes, but the semiconductor materials used are different. Infrared light-emitting diodes usually use materials such as gallium arsenide (GaAs) and gallium aluminum arsenide (GaAlAs), and are packaged in fully transparent or light blue, black resin.

　　 There are two ways to transmit and receive infrared, one is direct type, and the other is reflection type. Direct type means that the luminous tube and the receiving tube are placed at the two ends of the transmitter and the controlled object, with a certain distance between them; the reflective type means that the luminous tube and the receiving tube are arranged side by side, and the receiving tube is always without light, only the infrared emitted by the luminous tube When the light meets the reflector, the receiving tube will only work after receiving the reflected infrared light. The dual-tube infrared emission circuit can increase the emission power and increase the range of infrared emission.

      According to the characteristics of the infrared emitting tube chip, it can be more widely used according to different wavelengths, such as:

　　Wavelength: 940nm, suitable for remote control, such as the remote control of household appliances;

　　Wavelength: 808nm, suitable for medical equipment, space optical communication, infrared lighting, pump source of solid laser;

　　Wavelength: 830nm, suitable for automatic card swiping system on highways (night vision system is best, you can see a little red light on the die, the effect is better than 850nm);

　　Wavelength: 840nm, suitable for camera color zoom infrared waterproof;

　　Wavelength: 850nm, suitable for camera (video shooting) digital photography, monitoring, building intercom, anti-theft alarm, infrared waterproof;

　　 Wavelength: 870nm, suitable for cameras in shopping malls and intersections.