Eason Liao*, Xiaoxiao Wang, Muhammad Shafa, Guangjin Wang, Qing Zhang, Xingxing Du MASSPHOTON LIMITED Hong Kong, China * eason@massphoton.com ABSTRACT The spread of infectious diseases within hospitals is notably exacerbated by cross-contamination through small medical devices such as mobile phones,

Deep UV LED package is a hotspot of growing concern for research scholars, it is through the LED semiconductor light-emitting devices emit UVC band ultraviolet (typical wavelength 260 ~ 280nm), is a new type of healthy artificial light source, compared with the traditional UV light source mercury lamps, the deep UV LED has a wavelength of accurate and controllable, green, and so on many advantages. This paper summarizes the key technologies of deep-ultraviolet packaging, the performance of deep-ultraviolet LEDs and the application of deep-ultraviolet LEDs; through the understanding of the packaging materials, packaging structure, packaging process and so on to improve the performance of deep-ultraviolet LEDs, so that it is better to apply to the market, which can be seen that the deep-ultraviolet LEDs have a great prospect for development.

Explore a comprehensive review of semiconductor laser packaging technology, focusing on thermal management, optical performance enhancement, and reliability issues. Discover key advancements in heat sinks, packaging structures, and beam shaping techniques.

This study systematically investigated the mechanisms underlying the effects of UV-C LED irradiation on the preservation of fresh fruits. High-power 270–280 nm gallium nitride (GaN)-based UV-C LED chips were employed, with device performance enhanced through optimized heat dissipation structures and a matrix arrangement design. Experimental results demonstrated that, under ambient conditions (22–27°C), a 75% duty cycle UV-C irradiation (45 s on/15 s off) achieved the most effective suppression of mold growth on apple slices and raspberries, completely inhibiting mold proliferation.

Eason Liao1[1] , Xiaoxiao Wang2[1], Qing Zhang[1], Jiancheng Wang[1], Shuzhong L[1]1 MASSPHOTON LIMITED Hong Kong, China, HK1100

The aim of this study was to evaluate the efficacy of a novel airsterilization system on airborne microorganisms in both lab environment and office environment. Here we used a UV-C LED based technique to continuously purify the air. It was observed that in lab testing environment, the disinfection rate of the UV-C LED system is 99.94% against staphylococci albus (8032) within a 20 m³ space in 2 hours, while 99.6%, 99.02% and 98.65% against natural microorganisms in 2 hours within 100 m³ , 150 m³ and 210 m³ space respectively. Additionally, for a 5-day onsite testing conducted in normally operating offices, the results show a disinfection rate up to 92% against natural airborne microorganisms. The results also show zero ozone emission from the UV-C LED based air sterilization devices.

Eason Liao *MASSPHOTON LIMITED Hong Kong, Hong Kong, HK1100, China, eason@massphoton.comXiaoxiao WangMASSPHOTON LIMITED Hong Kong, Hong Kong, HK1100, China, sunny@massphoton.comMuhammad FurqanChase Farm Hospital National Health Service London, London, United Kingdomm.furqanl@nhs.netMuhammad ShafaMAS

The study demonstrates that the MASSPHOTON Q6060-D UV-C air sterilizer, utilizing 260–280nm UVC LED technology, effectively achieves multi-functional air purification. It inactivates airborne bacteria and viruses, removes TVOCs, PM2.5, and ammonia, with sterilization rates over 70% in real-world spaces and up to 99.9% odor removal in testing. This highlights its strong potential for commercial indoor air disinfection and odor control.

This study explores how to optimize the performance of UV-C LED water disinfection modules by examining key factors such as heat dissipation materials, driving current, and optical design. Findings show that copper substrates significantly lower light power attenuation (41.90% vs. 53.94% with aluminum), extending LED lifespan. Increasing the driving current from 100 mA to 200 mA improves E. coli inactivation to >99.999%, meeting drinking water standards. An optimized optical structure—reducing LED beads from six to four and adding individual perforations—maintains high sterilization rates while cutting costs by 33%. These insights support the development of efficient, durable, and cost-effective UV-C LED disinfection systems.