7 April 2023
Silanna UV presenting 235nm far-UVC LEDs using new SPSL technology
At the International Conference on UV LED Technologies & Applications (ICULTA 2023) in Berlin, Germany (23-26 April), as well as being a Silver sponsor UV-C LED maker Silanna UV of Brisbane, Australia is presenting new technology that is said to push the boundaries of far-UVC LEDs to emit at shorter wavelengths, at higher power, and with longer lifetimes.
On 24 April (10-10.30am), product development manager William Lee is giving a talk ‘High Power 235nm far UVC LED using SPSL technology’. The firm is also exhibiting its SF1 series 235nm and SF3 series 255nm UV LEDs.
The new UVC LED technology offers advantages for applications as diverse as disinfection, water quality monitoring, gas sensing, liquid chromatography, and chemical and biological analysis.
Conventional aluminium gallium nitride (AlGaN)-based far-UVC LEDs in general suffer from poor carrier injection, low light emission and high drive voltage, due to the inherit limitations of high-aluminium-content AlGaN.
Silanna’s new short-period superlattice (SPSL) far-UVC LED structure helps to overcome these issues. In an SPSL device, composed of repeating layers of AlN and GaN, the presence of GaN maintains the TE (transverse electric) dominance of the emission as well as lowering the activation energy of donors, resulting in more efficient devices compared with LEDs made with the conventional AlGaN technology. Furthermore, the emission wavelength can be easily tuned using the thickness of the GaN well. This process is significantly easier to control than tuning of Al composition in the barrier and well, notes Silanna UV.
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