Mr. Murali Kumar Profile

Murali Kumar

at Luminus Inc

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Proceedings Article | 1 March 2019 Presentation + Paper

Advances in UV-A and UV-C LEDs and the applications they enable

M. Kumar

Proceedings Volume 10940, 1094008 (2019) https://doi.org/10.1117/12.2507074

KEYWORDS: Light emitting diodes, Blue light emitting diodes, Lamps, 3D printing, Ultraviolet radiation, Ultraviolet light emitting diodes, Reliability, Additive manufacturing

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UV-A LEDs have seen efficiencies reach almost 70% and a substantial reduction in cost over the last few years. These trends have enabled UV-LED-based curing to become a mainstream application with most LEDs being driven at 1-2 A/mm². At the same time novel applications, such as high-volume 3D Printing requiring higher power from UV LEDs have started to emerge. To address these applications, and to improve system speed in traditional applications, Luminus Devices has developed UV-A LEDs that can be operated at up to 4 A/mm² which is the highest current density of any commercially available LED on the market. These next generation LEDs are very reliable and at 4 A/mm² enable up to 74% higher power than LEDs driven at 2 A/mm2. This paper presents the performance characteristics of these nextgeneration LEDs, the novel and emerging applications they enable and provides a roadmap for future performance gains. UV-C LEDs are starting to become commercially viable but have low wall-plug efficiencies of 2%-4% and power levels reaching 100 mW. UV-C LEDs are not only replacing lamps but creating entirely new markets. The current status of UV-C LEDs is presented along with a discussion of the applications the LEDs will enable over the next 2-3 years.

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