Since February 2017, a total of five research institutes and companies have participated in the “UV Power†research project, which is funded by the German Federal Ministry of Education and Research (BMBF). The goal of these partners is to provide high power UV LEDs for a wide range of applications. These LEDs will eventually replace traditional UV light sources containing toxic mercury, which are widely used in production, disinfection, environmental, life sciences and medicine. UV LEDs are very likely to open up new applications.
â–² UV-LED with flip chip geometry mounted on the AIN subassembly
As part of the “Advanced UV for Life†project, associations of research institutions and companies are funded by the federal “Zwanzig20†program. OSRAM Opto Semiconductors is currently working with four partners to develop high-power UV LED products for the mass market: four partners are Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH), Technical University of Berlin, LayTec AG and UVphototonics NT GmbH. LEDs (see sample) and UVB and UVC spectroscopy based on aluminum nitride (AlGaN) material systems are planned for high power LED manufacturing in 2020.
Therefore, the partners have put their respective scientific expertise into the project, and are equipped with highly specialized technical equipment and analytical methods. In the entire technology chain of LED production, the development of high-power LEDs is in full swing. “We assign different tasks to our partners – from the production of structured sapphire substrates, epitaxy and chip processing to packaging and analysis,†said Dr. Hans-Jürgen Lugauer, Head of UV R&D at OSRAM Opto Semiconductors in Germany. “Our position in the international market and technology in industrial manufacturing have increased the influence of the association.â€
In order to accelerate research and development and efficiently use various resources, partners assign research work according to different wavelength ranges. In addition to coordinating the entire project, OSRAM Opto Semiconductors is also responsible for the 270 to 290 nm wavelength range. In terms of epitaxy, Ferdinand-Braun-Institut is responsible for the adjacent wavelength of UVB between 290 nm and 310 nm, and is also responsible for the integration of epitaxial wafers into the processing of UV chips. The Technical University of Berlin focuses on the wavelength range from 250 nm to 270 nm and utilizes its own technical expertise for material analysis of AIGaN materials and AIGaN LEDs. TU Berlin also has a wide range of professional equipment for UV analysis. LayTec AG develops custom technology for controlling epitaxial and plasma etching systems. FBH spin-off UVphotonics NT GmbH is for users. The company is responsible for optimizing the chip design to achieve high current and efficient cooling. The company is also responsible for collecting statistical data, analyzing processing data for the entire production chain, and providing this data to project partners to optimize the production process. FBH, TUB and UVphotonics will also delve into important topics such as assembly techniques and aging effects through other projects.
The new LED's light output is expected to exceed 120 mW, 140 mW and 80 mW in the three wavelength ranges of 300 ± 10 nm, 280 ± 10 nm and 260 ± 10 nm, respectively. At the same time, the research team is also working hard to improve the aging behavior of LEDs, so that LEDs can operate more sustainably and economically.
Air Glow Series
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