What is a SWIR LED?

A SWIR LED is a light-emitting diode that emits short-wave infrared light, typically in the 1000-1950 nm range. SWIR LEDs are built on indium gallium arsenide (InGaAs) semiconductor material and require InGaAs camera sensors for detection because they emit beyond the silicon detector cutoff at ~1100 nm.

Which SWIR LED wavelength should I use for my application?

Selection depends on the target’s absorption profile. For moisture detection: 1450 nm (water absorption peak). For eye-safe outdoor sensing: 1550 nm (above the 1400 nm vitreous absorption threshold). For oil and plastic sorting: 1650 nm (C-H bond absorption). For machine vision through silicon or fog: 1050-1200 nm. For multispectral imaging: combine multiple wavelengths in an array.

What’s the difference between SWIR LEDs and NIR LEDs?

NIR (infravermelho próximo) LEDs emit at 750-1000 nm and are detected by silicon cameras and photodiodes. SWIR (infravermelho de ondas curtas) LEDs emit at 1050-1700 nm and require InGaAs sensors. SWIR LEDs reveal information silicon-based systems cannot see: material composition through absorption signatures, water content, hydrocarbon presence, and through-fog imaging.

Are SWIR LEDs eye-safe?

SWIR wavelengths above approximately 1400 nm (por exemplo, 1450, 1550, 1650, 1750 nm) are strongly absorbed by the vitreous fluid in the eye before reaching the retina, providing an inherent eye-safety advantage. This is why 1550 nm is the standard for eye-safe industrial sensing and automotive LiDAR. SWIR LEDs below 1400 nm (1050, 1200 nm) do not have this advantage and require IEC 60825-1 laser/LED safety classification per application.

Can I use a regular CMOS or CCD camera with SWIR LEDs?

Não. Silicon-based image sensors (CMOS, CCD) become insensitive past approximately 1000 nm and are effectively blind by 1100 nm. SWIR LEDs require InGaAs or extended-InGaAs sensors for detection. This is the largest cost driver in SWIR system design: InGaAs cameras typically cost 10-50x more than equivalent silicon cameras.

Why are SWIR LEDs more expensive than NIR LEDs?

SWIR LEDs use InGaAs semiconductor material, which is harder to fabricate, has lower wall-plug efficiency, and lower production volume than the InGaN (UV/visible) or GaAs (NIR) materials used in shorter-wavelength LEDs. Industrial SWIR LEDs typically cost 10-100x more per milliwatt of optical output than equivalent visible LEDs. Volume pricing improves as commercial demand grows for SWIR imaging applications.

What’s the typical lifetime of a SWIR LED?

Industrial SWIR LEDs rate L70 (time to 70% output) no 10,000-30,000 hours when operated within thermal and electrical specifications. Lifetime is highly sensitive to junction temperature; derating drive current and adding heat sinking can substantially extend operational life. Pulsed operation (low duty cycle) also extends lifetime by reducing average junction temperature.

How do I design a multispectral SWIR imaging system?

Four interlocked components: (1) select the wavelength set based on the target’s spectral signatures; (2) match the SWIR LEDs and InGaAs camera spectral responses; (3) use SWIR-transparent optics (quartz, sapphire, SWIR-rated glasses, silicon and standard polymers don’t work); (4) drive the LEDs with per-channel current regulation and synchronize pulses with camera exposure. Custom multispectral array modules from a SWIR LED component supplier are often more cost-effective than building from individual emitters for production volumes.

What is a multispectral SWIR LED system?

A multispectral SWIR LED system combines two or more discrete short-wave infrared wavelengths between 1050 e 1750 nm in one illuminator, paired with an InGaAs camera, so it can read several absorption features in a single inspection. Each wavelength targets a specific signature (por exemplo 1450 nm for water, 1650 nm for hydrocarbons), and the captured band intensities classify material that looks identical under visible light. See the Multispectral LED arrays section above for array architectures and drive considerations.

Is there a component selection guide for 1050 para 1750 nm SWIR LEDs?

Sim. Start from the target absorption feature to fix the center wavelength (the spectrum table above), then work the seven-step component selection checklist: wavelength bin, spectral bandwidth, radiant output and irradiance, beam angle and uniformity, package and thermal path, drive scheme, and detector and optics match. That sequence turns an application into a buildable SWIR LED specification across the full 1050 para 1750 banda nm.