Pushing the boundaries of UV LED power
- Release on :2017-12-06
The optical outputs are expected to be:
- >20mW at 300±10nm
- >140mW at 280±10nm
- >80mW at 260±10nm
One of the project aims is to make sources that are sufficiently long-lived to replace mercury-based sources in production, disinfection, life sciences and medicine, and to open up new applications.
Research partners are pooling scientific know-how, specialised technical facilities and analysis methods. Developments are being attempted along the entire LED production chain.
“The various tasks have been distributed among the partners on the basis of their strengths – everything from the production of structured sapphire substrates, epitaxy and chip processing to packaging and analytics”, said Osram UV LED development head Dr Hans-Jürgen Lugauer, adding: “With our presence on the international market and our expertise in industrial manufacturing we are boosting the impact of the consortium considerably.”
Aluminum gallium nitride is the chosen material, and work is split into different wavelength ranges:
- Osram is taking on 270 to 290nm.
- In epitaxy, the Ferdinand-Braun-Institut is covering UVB wavelengths between 290 and 310nm, and processing the epitaxial wafers into UV chips.
- Technical University of Berlin is focusing on 250 to 270nm, applying its expertise in material analysis for AIGaN materials and AIGaN LEDs – it has specialised equipment for UV analysis.
- LayTec is developing tailor-made techniques for controlling epitaxy and plasma etching systems.
- Leibniz-Institut für Höchstfrequenztechnik (FBH) spin-off UVphotonics NT is responsible for optimising the chip design, for achieving high currents and for efficient cooling. The company is also handling the statistical collection and analysis of process data from the entire production chain and making this data available to the project partners for production optimisation.
- Assembly technology and the effects of ageing will be investigated by FBH, TUB and UVphotonics.
Prototype LEDs and the technology for producing high-power LEDs for UVB and UVC spectrums from AlGaN materials are scheduled to be presented by 2020.
More details of the project, called Advanced UV for Life, are available here.
Photo: UV LED flip-chip-mounted on an aluminium nitride sub-mount.