{"id":1973,"date":"2026-05-25T07:50:51","date_gmt":"2026-05-25T07:50:51","guid":{"rendered":"https:\/\/photo-detector.com\/?p=1973"},"modified":"2026-05-25T07:50:55","modified_gmt":"2026-05-25T07:50:55","slug":"855nm-nir-led","status":"publish","type":"post","link":"https:\/\/photo-detector.com\/es\/855nm-nir-led\/","title":{"rendered":"LED NIR de 855 nm frente a 850 nm para sensores de precisi\u00f3n"},"content":{"rendered":"\n

If you are an R&D engineer designing high-precision optical sensors, you have probably faced the classic dilemma of choosing the right wavelength. While the standard 850nm wavelength gets most of the industry spotlight, the specialized 855nm NIR LED<\/strong> is quietly solving some of the toughest alignment and filtering issues in high-resolution scanning, rotary encoders, and industrial optical barriers.<\/p>\n\n\n\n

At first glance, a 5nm difference seems trivial. After all, what is 5 nanometers when you are dealing with a broad near-infrared spectral curve? But in the world of high-performance optoelectronics, that tiny offset can represent the difference between a sensor that drifts out of spec in warm temperatures and one that operates reliably for years.<\/p>\n\n\n\n

Let’s dive into the core differences between a standard 850nm emitter and an 855nm NIR LED<\/strong> so you can make the best choice for your next prototype.<\/p>\n\n\n\n

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Decoding the Basics: What is an 855nm NIR LED?<\/h2>\n\n\n\n

An 855nm NIR LED<\/strong> is a near-infrared light-emitting diode specifically engineered to emit light with a peak spectral distribution centered at 855 nanometers. Most of these diodes are fabricated using Gallium Aluminum Arsenide (GaAlAs or AlGaAs) semiconductor materials. By adjusting the ratio of aluminum to gallium in the active layers during the metal-organic chemical vapor deposition (MOCVD) growth process, engineers can fine-tune the bandgap to target this exact wavelength.<\/p>\n\n\n\n

In B2B industrial applications, we often recommend the 855nm NIR LED<\/strong> for tasks requiring tight spatial control, highly collimated beams, or specific matching with narrow-bandpass optical filters. While standard LEDs are designed to emit as much raw light power as possible across a wide angle, a premium 855nm NIR LED<\/strong> is frequently designed as a point source emitter. This means the light is restricted to a microscopic emitting area, making it an excellent candidate to collimate.<\/p>\n\n\n\n

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The Nanometer Showdown: 850nm vs 855nm IR LED<\/h2>\n\n\n\n

When comparing a standard 850nm source with an 855nm NIR LED<\/strong>, we are looking at two emitters that share the same general near-infrared band (IR-A). However, their real-world performance characteristics differ in key physical and optical areas.<\/p>\n\n\n\n

Semiconductor Physics: Wavelength vs. Bandgap<\/h3>\n\n\n\n

To understand why these two wavelengths differ, we have to look at the semiconductor bandgap. The peak wavelength of a light-emitting diode is inversely proportional to the bandgap energy of the active layer. We can express this using a simple, universal formula:<\/p>\n\n\n\n

Wavelength (lambda) = (h * c) \/ Eg<\/p>\n\n\n\n

To make this practical for optical engineering, we can simplify it:<\/p>\n\n\n\n

Wavelength (in nm) \u2248 1240 \/ Eg (in eV)<\/p>\n\n\n\n

If we rearrange this to find the bandgap energy (Eg) for both emitters:<\/p>\n\n\n\n