From sensing, imaging, and spectroscopy to lasers and LEDs, photonics lies at the center of applied physics. An article, written under the leadership of Advanced UV for Life partners, is among the most viewed and most cited photonics and optoelectronics research in Applied Physics Letters. The top articles capture the most recent trends in our ability to control and utilize the interactions of light with matter.
Phototherapy involves exposure of the skin to light in order to treat various skin diseases such as psoriasis. In the 20th century, great advancements have been made in developing safe and effective narrowband ultraviolet B (NB‐UVB) phototherapy modalities. Targeted phototherapy delivers light exclusively to the affected skin and thereby avoids side effects on unaffected healthy areas. Recently, solid‐state UV light emitting diodes (UV LEDs) have the potential to become the light source of the future for targeted NB‐UVB phototherapy treatments.
A consortium of optics researchers describes a new method for fabricating ultraviolet optics that leverages a metallic intermediate layer on a plastic-coated aluminum reflector to increase stable lifetime operation under high-power UV LED irradiation.
In the study, OSA Opto Light's R&D team demonstrates that by applying a metallic intermediate layer such as a combination of copper (Cu) and nickel (Ni) with a thickness greater than 30 µm, it is possible to dramatically reduce the maximum temperature of the reflector — in this experiment, from 117°C to 51°C — and obtain long-term stability over 5000 hours under high-power irradiation from UV LEDs.
Together with the Charité Universitätsmedizin Berlin, C+K currently develops a new, extremely interesting, fast system to non-invasively measure SPF in vivo directly on the skin. The system has been proven to successfully implement hybrid SPF measurements combining in vivo with in vitro data.
The poster "Development of a fast non-invasive in vivo measurement of UVA-PF and SPF with new diffuse reflectance spectroscopy" of our partner Courage + Khazaka was named one of the 2019 IFSCC Top 10 Posters. It was presented by Georg Wiora at the 25th IFSCC Conference held in Milan, Italy 30 September – 2 October 2019.
The Top 10 Posters were chosen by the IFSCC Conference Awards Committee from over 300 posters exhibited.
The new UV LED based disinfection of beverage closures industry has been chosen among the 20th best submissions for the “XXII Innovation Award Thuringia 2019” on 5th of September by the jury.
A new 3D printing process, which should be clearly superior to the current processes in terms of print quality and speed as well as material homogeneity, is being developed in the research project "Belt deposited, double UV-cured materials for 3D engineering - overcoming the property limits of today's Rapid Manufacturing, BUERMa". Under the leadership of the Polymer Materials and Composites PYCO research division of the Fraunhofer Institute for Applied Polymer Research IAP, Freie Universität Berlin and Technische Hochschule Wildau are two Berlin-based companies working on the key technology of additive manufacturing (AM).
OSA Opto Light GmbH announces the successful launch of their new website. M. Hoppe, project leader from the sales team explained “With the new layout we are convinced to provide our customers a better structure and an easier navigation. The new website offers a better data availability, e.g. for our high power LED chips and the recent developed UV modules.”
For any further information and news please visit the website »www.osa‐opto.com.
In 2019, the Aluminium Nitride group launched a new crystal growth laboratory with three identical reactors for the sublimation growth of aluminium nitride monocrystals. This measure not only increases the growth capacity significantly, but also helps to guarantee reproducible growth conditions from test to test or plant to plant, even from an industrial point of view, i.e. within a very narrow parameter range.
FBH has investigated current induced degradation processes of deep UV LEDs. The derived acceleration factors point to the importance of optimizing the charge carrier distribution to improve the device lifetime.
UV light inactivates germs in drinking water. Until now, the disinfection process relied on mercury-vapor lamps, which emit light in the UV spectrum. However, mercury is a heavy metal that affects human health and the environment. Fraunhofer researchers are investigating a greener and more efficient alternative, which uses UV LEDs to destroy bacterial DNA. The technology is also suitable for disinfecting brewing water and for disinfecting the caps for bottled beer, soft drinks, and mineral water during the filling process.
In order to strengthen the sustainability of the "Advanced UV for Life" consortium, the Federal Ministry of Education and Research (BMBF) provided additional investment funds at the beginning of 2019 following a needs analysis. The TZW: DVGW-Technologiezentrum Wasser (German Water Centre) was selected to set up a hydraulic test stand specially designed for LED disinfection systems and an optical laboratory. These investments enable TZW to further expand its equipment and knowledge lead in the field of characterisation and testing of LED disinfection devices.
In June 2019, a meeting of ISO committee "Cosmetics" (ISO/TC 217) working group "Sun protection test methods" (WG 7) was held in Brussels. Prof. Dr. Jürgen Lademann, head of the "Center of Experimental and Applied Cutaneous Physiology" of the Charité and topic leader for medicine in the consortium 'Advanced UV for Life' was invited to present the latest research results on the non-invasive determination of the sun protection factor (SPF) of sunscreens.
Arne Knauer of Ferdinand-Braun-Institute (Germany) highlighted the advantages of the new 280 nm reflectance capability of EpiTT at LayTec's 23rd in-situ seminar. With newly developed analysis algorithms (available with EpiNet 2020) he was able to significantly speed up his research work on novel UV-LED device structures.
Two years after the first successful ‘International Conference on UV LED Technologies & Applications (ICULTA)’ the next conference will be held from April 26 to 29, 2020 at the MELIÃ Hotel in Berlin, Germany. Once more, it will bring together pioneers, leaders, and experts from science and industry to discuss latest progress and innovations in the development of UV LEDs and their broad spectrum of applications. The conference is jointly organized by the German consortium Advanced UV for Life and the International Ultraviolet Association (IUVA).
At Laser World of Photonics, FBH will present its capabilities in diode lasers and UV LEDs. It introduces compact live demonstrators for LiDAR and Raman spectroscopy. Results and advances in UV LEDs will be exhibited by FBH together with the spin-off UVphotonics.
The LED-system OLM-034-265 expands the OSA Opto Light product portfolio into the UV-C region. The key-unit of this system is a high-density array with 36 LED operating at 265 nm and reaching an optical power density of around 200 mW/cm².
Researchers at TU Berlin have identified a fall in carrier-injection efficiency as a significant contributor to the decline in efficiency of the deep UV LED as its emission is stretched to shorter wavelengths.
The team’s insight promises to aid attempts to increase the optical efficiency of these emitters, which are used for medical diagnostics and the sensing of gases such as nitrogen monoxide.
We would like to invite you to the vibrant city of Berlin for the International Workshop on Nitride Semiconductors 2020. The workshop will be held August 23rd to 28th, 2020 at the Hotel Maritim in the center of Berlin near Potsdamer Platz and Tiergarten park. The workshop will cover topics ranging from growth, characterization, novel materials & nanostructures to optical and electronic devices.
Many people associate ultraviolet (UV) light with an unpleasant sunburn. But this short-wave radiation has the capacity to solve important problems of the future. Providing clean water has enormous potential for the future. For water treatment they need the right radiation at the right place in the right amount. UV LEDs not only make this possible for large volumes but also save energy. The members of the Advanced UV for Life consortium are also exploring applications in medicine, such as effective disinfection strategies to combat multi-resistant bacteria and phototherapy treatments for skin disorders. Other areas of research include the targeted control of plant metabolism to enrich specific substances, and industrial curing processes.
Controlling waferbow is important in order to minimize performance variations between devices on a wafer. FBH recently developed and qualified a laser patterning process on 305 nm UVB LEDs that significantly reduces waferbow.
UVphotonics showcased its latest deep UV LED developments jointly with the Ferdinand-Braun-Institut (FBH). The featured products of UVphotonics at Photonics West 2019 comprised 310 nm UVB LEDs with output up to 30 mW (350 mA) and 265 nm UVC LEDs with output bigger than 25 mW (350 mA).
Due to the low efficiency and component lifetime of available UVB and UVC LEDs, established assembly technologies and component housings achieve only unsatisfactory results - both in terms of luminous efficacy and the urgently required heat dissipation. The silicon submount developed at the CiS Research Institute eliminates these disadvantages.
OSA Opto Light GmbH of Berlin, Germany (which makes custom-designed LED chips, SMD LEDs and LED modules emitting at wavelengths ranging from UV 350-420nm to VIS 420-660nm and IR 660-1080nm) has developed a high-performance UVC LED radiation source, emitting 4W optical power at an emission wavelength 275-280nm.
At Photonics West 2019, UVphotonics introduces UV LEDs emitting in the UVB and UVC wavelength regions. Applications of the LEDs include sensing, phototherapy and plant growth lighting. Together with the Ferdinand-Braun-Institut, the company covers the full UV LED technology chain, from the epitaxial growth of LED wafers up to complete turn-key modules, ready to use in applications.