AES Semigas


14 October 2022

Silanna UV launches far UV-C 235nm and deep UV-C 255nm LEDs

Silanna UV of Brisbane, Australia has launched far UV-C and deep UV-C LEDs that take advantage of the firm’s patented short-period superlattice (SPSL) technology for what it claims is industry-leading performance in the difficult-to-obtain 230–265nm UV range – including the highest output power in any mass-produced UV LED at 235nm.

Silanna UV says that its patented SPSL approach overcomes many of the difficulties that plague competing aluminium gallium nitride (AlGaN) UV-C LED technologies. By engineering a nanostructure from alternating layers of AlN and GaN, Silanna UV has developed a new material that is said to be easier to control and have far superior properties to traditional AlGaN. Silanna says that its SPSL mitigates several issues that AlGaN has for short-wavelength LEDs, particularly the older method’s poor light extraction and electrical performance.

The new far UV-C 235nm SF1 series and deep UV-C 255nm SN3 series are both available in either 120º or 30º viewing-angle SMD packages, making them suitable for a wide range of applications. The 30º package’s parabolic lens provides greater irradiance than even traditional UV lamps, the firm says. Both the SF1 and SN3 series have low power consumption and long operating lifetimes.

The new LEDs are suitable for various deep UV and far UV sterilization, water and gas sensing, and instrumentation applications. The SF1 and SN3 series are powerful, small-footprint deep UV-C emitters that deliver long lifetimes and high conversion efficiency. 

The 235nm peak-wavelength SF1 series comprises the 120º viewing-angle (SF1-3C3FWL1) and the 30º viewing-angle (SF1-3U8P3L1). The far UV LEDs are effective for water quality detection of nitrate (NO3) and nitrite (NO2) gas detection and high-performance liquid chromatography (HPLC). Sensing applications can be enhanced by the higher irradiance of the SF1-3U8P3L1’s 30º collimated source design.

The 255nm deep UV-C SN3 series is suitable for water quality applications, including UV254 organic compound sensors, chemical oxygen demand monitoring, and the measurement of suspended solids. Other application include ozone gas (O3) detectors and medical analyzers. Both 120º (SN3-5C3FWL1) and 30º (SN3-5U8P3L1) package versions are available. The 30º collimated source design of the SN3-5U8P3L1 package offers higher irradiance for enhanced resolution in sensing applications.

Tags: UVC LEDs