What is the difference between normal LED and infrared LED?

Infrared LEDs (infrared light emitting diodes), as a special type of LED, have many classification methods and are widely used in many fields. The following is a detailed answer to the classification and application of infrared LEDs:

Classification

Infrared LEDs can be mainly classified according to the following aspects:

Wavelength:

According to the wavelength range, infrared LEDs can be divided into near infrared, mid-infrared and far infrared. The near infrared wavelength range is 700 nanometers to 1000 nanometers, the mid-infrared wavelength range is 1000 nanometers to 1500 nanometers, and the far infrared wavelength range is 1500 nanometers to 2000 nanometers. In addition, there are subdivisions of short-wave infrared LEDs (such as around 850nm) and long-wave infrared LEDs (such as around 940nm).

Power:

The power of infrared LEDs can range from a few milliwatts to several watts. According to the power, it can be divided into low-power and high-power types. Low-power infrared LEDs are generally used in applications with low power requirements, while high-power infrared LEDs are suitable for applications with high power requirements.

Package form:

The package forms of infrared LEDs include SMD (surface mount package), DIP (plug-in package) and COB (chip-level package). SMD package is the most common because of its small size and suitable for high-density integration applications; DIP package is larger in size and suitable for special scenarios; COB package can achieve higher power and brightness output.

Field of view:

Depending on the field of view, infrared LEDs can be divided into wide-angle and narrow-angle types. Wide-angle infrared LEDs have a larger field of view and a wide radiation range, which are suitable for applications that require a wider coverage range; narrow-angle infrared LEDs have a smaller field of view and a narrow radiation range, which are suitable for applications that require precise irradiation.

Application

The application fields of infrared LEDs are very wide, including but not limited to the following aspects:

Remote control:

Infrared LEDs are widely used in various remote controls, such as TV remote controls, air conditioner remote controls, and car remote controls. They achieve remote control of devices by emitting infrared light signals.

Security monitoring:

In the field of security monitoring, infrared LEDs are often used in infrared cameras and infrared sensors. They can emit infrared light under low light conditions to improve the effect of night monitoring.

Infrared communication:

Infrared LEDs are also used in infrared communication, such as infrared remote control, infrared data transmission, etc. By emitting and receiving infrared light signals, wireless data transmission and communication are realized.

Biomedicine:

In the medical field, infrared LEDs are used in pulse rate detection, oximeter, infrared laser therapy device and other equipment. Infrared light can penetrate the skin, which is of great significance for non-contact medical detection and treatment.

Automobile field:

Infrared LEDs are also used in the automotive field, such as infrared cameras and infrared sensors in automobiles, which are used for assisted driving and safety monitoring.

Other fields:

Infrared LEDs can also be used in fiber optic communication, special lighting, display backlight, environmental monitoring, solar cells and other fields. For example, in fiber optic communication, infrared LEDs can convert electrical signals into optical signals to achieve high-speed data transmission; in environmental monitoring, infrared LEDs can be used to analyze air quality and water quality, etc.

In summary, infrared LEDs play an increasingly important role in modern science and technology due to their unique properties and wide range of applications.