With the rapid development of technology, infrared (IR) LEDs have become an essential component in various applications, ranging from consumer electronics to industrial automation. In this article, we will delve into the world of IR LEDs with a focus on the crucial parameter - nm (nanometers). Understanding the different nm values of IR LEDs is vital for selecting the right device for specific applications.

Introduction to IR LEDs

Infrared LEDs, also known as IR emitters or IR diodes, are semiconductor devices that emit infrared light when an electric current passes through them. They are widely used in various applications, such as remote controls, surveillance systems, communication, and medical devices. IR LEDs come in different wavelengths, which determine the color and application of the emitted light.

Understanding nm in IR LEDs

The nm value in IR LEDs refers to the wavelength of the emitted light, measured in nanometers. Wavelength is the distance between two consecutive crests or troughs of a wave, and it is a crucial factor in determining the properties and applications of an IR LED. Different nm values of IR LEDs produce light with different colors and properties, making them suitable for various applications.

Types of IR LEDs based on nm values

IR LEDs are available in various nm values, each with its unique characteristics and applications. Here are some common types of IR LEDs based on their nm values:

IR LEDs with nm values of 780-790 nm

This range of IR LEDs emits near-infrared light, which is invisible to the human eye. They are commonly used in remote controls, communication systems, and surveillance cameras. The 780 nm wavelength is often used in consumer electronics, while the 790 nm wavelength is more suitable for industrial applications.

IR LEDs with nm values of 850-870 nm

IR LEDs in this nm range emit light with a longer wavelength than near-infrared, making them less visible to the human eye. They are used in medical devices, such as endoscopes, and in industrial applications, such as barcode scanners and optical sensors.

IR LEDs with nm values of 940-950 nm

This range of IR LEDs emits far-infrared light, which is barely detectable by the human eye. They are widely used in automotive and industrial applications, such as automotive reverse sensors, motion detection, and thermal imaging cameras.

Choosing the right IR LED for your application

Selecting the appropriate IR LED for your application requires considering various factors, including the nm value, the intensity of the emitted light, and the specific requirements of your application. Here are some tips for choosing the right IR LED:

• Identify the application: Determine the purpose of the IR LED in your application. For example, if you need a remote control, you would choose an IR LED with a 780-790 nm wavelength.
• Consider the intensity: Ensure that the IR LED has enough intensity to meet the requirements of your application. Intensity is usually measured in milliwatts (mW) or watts (W).
• Check the viewing angle: The viewing angle of an IR LED determines the area where the emitted light is concentrated. Choose an IR LED with a viewing angle that suits your application.
• Assess the package type: IR LEDs are available in various package types, such as TO-5, TO-18, and SMD. Select the package type that best fits your design requirements.

Conclusion

Infrared LEDs with different nm values play a crucial role in a wide range of applications. Understanding the characteristics and applications of IR LEDs with various nm values is essential for selecting the right device for your specific needs. By considering factors such as the application, intensity, viewing angle, and package type, you can ensure that your IR LED meets the requirements of your project.