Solid–Liquid Hybrid‐State Organic Lens for Highly Efficient Deep Ultraviolet Light‐Emitting Diodes

Abstract

Deep ultraviolet light‐emitting diodes (DUV‐LEDs) are considered to be the most promising ultraviolet light sources for effective and fast sterilization under the worldwide spread of the coronavirus disease (COVID‐19). However, it reminds challenging to promote the light extraction of DUV‐LEDs owing to the strong DUV light absorption of conventional encapsulation materials. Herein, solid–liquid hybrid‐state gels (SLHGs) to fabricate organic lenses for DUV‐LEDs, which largely enhance the light extraction efficiency without sacrificing the working stability, are proposed. Solid‐state cross‐linked networks of polydimethylsiloxane are used in the SLHG structure to maintain the liquid components of silicone oil and demonstrate excellent formability, DUV transparency (over 90% transmittance in the UVC range), and thermal stability. The radiant power of DUV‐LEDs (275 nm) with the optimized SLHG organic lens is enhanced by 52.5% compared to a commercial quartz lens, achieving a record packaging optical effiency of 1.31 among solid‐state packaging DUV‐LEDs. A sterilization evaluation for SARS‐CoV‐2 demonstrates that the inactivation time can be reduced by ≈25% using the SLHG organic lens. Consequently, herein, a feasible and effective method to enhance the optical performance of DUV‐LEDs and advance their promising potential for disinfection applications is provided.

Light-Field Optimization of Deep-Ultraviolet LED Modules for Efficient Microbial Inactivation

“…Thus, related technological breakthroughs are required to face the challenges mentioned for improving the efficiency of DUV LED. Attempts such as the high-temperature annealing method in the material growth process and solid-liquid hybrid-state organic lenses in the packaging process have been investigated [16,17]. Nevertheless, the current performance of a single DUV LED chip on the irradiation area and uniformity still need a huge enhancement to meet the requirements in the practical application of disinfection.…”

Applications and challenges of hybrid artificial intelligence in chip age testing: a comprehensive review

“…Finally, the prospects of hybrid AI in chip lifespan and aging testing are summarized and predicted. In conclusion, this article provides a valuable reference and inspiration for relevant researchers, aiming to promote the development of hybrid AI in the field of chip lifespan and aging testing by comprehensively reviewing its research and application, analyzing the current challenges and future development trends [1][2][3][4].…”