UV LEDs with optimized light extraction due to adapted encapsulation technology
| German title: | UV-LEDs mit optimierter Lichtauskopplung durch angepasste Vergusstechnologie | |
| Acronym: | Olavv | |
| Duration: | 1st December 2018 - 31st May 2021 | |
| Description: | The starting point was the measures for surface disinfection in connection with the Corona pandemic. Here, UVC modules based on LED chips can replace classic mercury vapor lamps in the future. Provided that the necessary optical power can be guaranteed for disinfection. The project goal was therefore to optimize the light extraction efficiency (LEE) of UV LED chips to the point of a technologically usable process configuration. Bare UV LED chips typically have an LEE value of about 5-9%. This makes LEE by far the most effective lever for increasing the optical power and overall efficiency of UV LEDs. Light extraction is significantly improved if the UV LED is encapsulated or potted with UV-transparent and UV-stable material to reduce the refractive index jump. The encapsulation material must be suitable for a wavelength of 250 nm and remain stable over time. In addition, the total reflection in the LED base body must be n >> 1.4 due to a refractive index of the cured material. A potting technique was developed that can increase the output of UVC LEDs by up to 70%. |
|
| Funded by: | BMBF |  |
| Project sponsor: | Projektträger Jülich | |
| Funding code: | 03ZZ0144A | |
| Contact: | Contact us about this project via our business unit MOEMS | |
News articles about Olavv: | ||
 |
UVC LEDs: Increased optical performance thanks to an optimized encapsulation material 24. January 2022 |
|
 |
SPIE Photonics West 2022 in San Francisco 20. January 2022 |
|
« back to project overview
