230nm Far UV-C LEDs: Advancing the Next Generation of Analytical Sensing

Ultraviolet wavelengths below 240nm play a crucial role in modern analytical science. In this spectral region, many chemical compounds exhibit strong absorption characteristics, enabling precise detection using spectroscopic techniques. For decades, analytical instruments have relied on traditional light sources such as deuterium or mercury lamps to generate these wavelengths.

Although these legacy technologies remain functional, they bring several disadvantages. They are often bulky, fragile, and require high operating voltages. In addition, they need warm-up time before reaching stable output. The presence of hazardous materials like mercury also raises environmental and regulatory concerns.

Recent progress in solid-state ultraviolet technology is changing this landscape. UV-C LEDs offer a compact, durable alternative that can switch on instantly and operate more efficiently. However, producing reliable LEDs in the far UV-C region has historically been challenging. Conventional semiconductor approaches typically struggle with low efficiency and reliability at very short wavelengths.

Silanna UV’s latest innovation aims to overcome these barriers.

Introducing a New Generation of Far UV-C LEDs

Silanna UV has developed the SF2 series, a new generation of far UV-C LEDs that operate around 230nm. The devices are built using the company’s proprietary Short Period Superlattice (SPSL) technology, designed to address many of the limitations associated with earlier deep-UV LED designs.

This new architecture delivers significant improvements in optical output and operational stability compared with previous generations. The result is a high-performance light source tailored for analytical instruments where accuracy and reliability are essential.

Typical specifications include:

These characteristics position the SF2 LED as a precise and stable light source for analytical sensing applications.

Enabling More Precise Environmental Monitoring

Accurate chemical analysis is fundamental to environmental monitoring and industrial process control. In many sensing applications, the choice of light source directly determines the accuracy and sensitivity of the measurement system.

Water Quality Monitoring

One important application is the detection of nitrate (NO₃⁻) and nitrite (NO₂⁻) in water. These compounds have strong absorption features in the far UV region, particularly near 230nm. LEDs designed to emit within a tightly controlled wavelength range allow sensing systems to target these absorption peaks more precisely, improving measurement accuracy.

Gas Detection

Far UV-C light sources are also useful in gas sensing technologies. At wavelengths around 230nm, instruments can measure gases such as carbon dioxide (CO₂) and nitric oxide (NO). Stable and spectrally narrow LED emission helps designers build gas analysers that are both selective and reliable.

Performance Characteristics that Matter to Instrument Designers

When integrating a UV source into analytical equipment, several parameters determine overall performance. The SF2 LED series focuses on improvements in these key areas.

Narrow Wavelength Control

The SF2 LEDs typically emit at around 233nm, with a tight wavelength distribution between 230nm and 234nm. This narrow range allows instrument developers to match the light source precisely to the absorption features of target molecules, improving detection accuracy.

High Radiant Intensity

Radiant intensity determines how much usable optical power can be delivered to the sample. Operating at a standard 20mA drive current, the device generates concentrated optical output shaped by an integrated lens into a narrow beam. This focused emission improves optical coupling and enhances signal-to-noise ratios during measurement.

Temperature Stability

Environmental sensors often operate in varying temperatures. The SF2 series demonstrates improved thermal stability, with relatively small output variation across a broad temperature range. Maintaining consistent optical output reduces the need for recalibration and ensures reliable measurements in field deployments.

Efficient Electrical Operation

Another advantage is the ability to achieve strong optical performance with modest electrical requirements. With a typical forward current of about 20mA and a forward voltage around 6.5V, system designers can simplify driver electronics and reduce thermal management demands. This makes it easier to design compact, cost-effective instruments.

Improvements Over Earlier LED Generations

The SF2 platform represents a significant advancement over earlier far UV-C LED technologies.

Key improvements include:

• Tighter wavelength control, allowing more accurate targeting of chemical absorption peaks

• Substantially higher radiant intensity, delivering stronger signals for optical detection

• Improved temperature stability, ensuring more consistent measurement performance

Together, these enhancements enable more reliable analytical instruments and expand the practical applications of far UV-C LEDs.

Designed for Robust Long-Term Operation

Analytical systems are often deployed in challenging environments and expected to operate continuously for extended periods. To support this requirement, the SF2 LEDs are packaged in a hermetically sealed TO-39 metal can.

This packaging approach offers improved resistance to moisture, dust, and other environmental contaminants compared with many surface-mount LED packages. The rugged construction helps ensure long-term reliability in demanding industrial or environmental monitoring systems.

Supporting Innovation in Analytical Instrumentation

Advances in UV-C LED technology are enabling a new generation of analytical instruments that are smaller, more efficient, and more reliable than systems based on traditional lamps.

With its improved power output, enhanced thermal stability, and precisely controlled emission wavelength, the SF2 series demonstrates how far UV-C LEDs can accelerate the development of advanced sensing technologies for environmental monitoring, gas analysis, and industrial process control.

As solid-state UV sources continue to evolve, they are poised to become a key enabling technology for future analytical instrumentation.

For more information on 230nm Far UV-C LED: A Leap Forward in Analytical Sensing from Silanna UV talk to AP Technologies Ltd