Surface disinfection has taken on a new role in the context of the corona pandemic. UVC modules based on LED chips strive to replace mercury vapor lamps. However this will only be achieved if the necessary optical performance for disinfection can be guaranteed. We would like to present the development of potting materials for UVC LED chips. The aim was to find a potting material for use at a wavelength of 250 nm, which is sufficiently transparent, easy to process and which remains stable in its properties for many 100 hours at these wavelengths. Furthermore, the total reflection in the LED base body should be minimized by a refractive index of the cured material n >> 1.4. In addition to the aspects of material development, metrological requirements and long-term studies are also presented. We have succeeded in developing a potting technology that can greatly increase the performance of the UVC LEDs by up to 70%.
Deep ultraviolet (UV) light emitting diodes (LEDs) have a wide range of applications such as water treatment, medical diagnostics, sterilization of medical devices and gas measurement. Depending on the desired application, the emission characteristics of UV light must be optimized. In addition to improving the external quantum efficiency, the radiation properties of the UV LED chip can be influenced and supported by the performance of the housing and the assembly technology.
We will present some results on how to improve the optical performance of UV LED chips through optically UV-transparent materials, which are complemented by some basic aging studies. Furthermore, the influence of differently shaped lenses in combination with and without an integrated aluminum reflector is presented.
We want to show the influence of the different optical and thermal elements individually and in combination to show the possibilities to design the optimal radiator module with the desired properties.
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