High-power UV-B LEDs with long lifetime

Jens Rass; Tim Kolbe; Neysha Lobo-Ploch; Tim Wernicke; Frank Mehnke; Christian Kuhn; Johannes Enslin; Martin Guttmann; Christoph Reich; Anna Mogilatenko; Johannes Glaab; Christoph Stoelmacker; Mickael Lapeyrade; Sven Einfeldt; Markus Weyers; Michael Kneissl

doi:10.1117/12.2077426

13 March 2015 High-power UV-B LEDs with long lifetime

Jens Rass, Tim Kolbe, Neysha Lobo-Ploch, Tim Wernicke, Frank Mehnke, Christian Kuhn, Johannes Enslin, Martin Guttmann, Christoph Reich, Anna Mogilatenko, Johannes Glaab, Christoph Stoelmacker, Mickael Lapeyrade, Sven Einfeldt, Markus Weyers, Michael Kneissl

Author Affiliations +

Proceedings Volume 9363, Gallium Nitride Materials and Devices X; 93631K (2015) https://doi.org/10.1117/12.2077426
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

UV light emitters in the UV-B spectral range between 280 nm and 320 nm are of great interest for applications such as phototherapy, gas sensing, plant growth lighting, and UV curing. In this paper we present high power UV-B LEDs grown by MOVPE on sapphire substrates. By optimizing the heterostructure design, growth parameters and processing technologies, signiﬁcant progress was achieved with respect to internal eﬃciency, injection eﬃciency and light extraction. LED chips emitting at 310 nm with maximum output powers of up to 18 mW have been realized. Lifetime measurements show approximately 20% decrease in emission power after 1,000 operating hours at 100 mA and 5 mW output power and less than 30% after 3,500 hours of operation, thus indicating an L50 lifetime beyond 10,000 hours.

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Jens Rass, Tim Kolbe, Neysha Lobo-Ploch, Tim Wernicke, Frank Mehnke, Christian Kuhn, Johannes Enslin, Martin Guttmann, Christoph Reich, Anna Mogilatenko, Johannes Glaab, Christoph Stoelmacker, Mickael Lapeyrade, Sven Einfeldt, Markus Weyers, and Michael Kneissl "High-power UV-B LEDs with long lifetime", Proc. SPIE 9363, Gallium Nitride Materials and Devices X, 93631K (13 March 2015); https://doi.org/10.1117/12.2077426

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