Views: 0 Author: Site Editor Publish Time: 2022-06-22 Origin: Site
7. Multi-element alloy superlattice high-efficiency UV LED
In June 2021, the Institute of Semiconductors, Guangdong Academy of Sciences carried out systematic and in-depth technical research and development on UV LEDs from the aspects of material growth and device design, and successfully developed UV LED devices with high internal quantum efficiency.
The researchers successfully prepared high-quality AlGaN materials and AlGaN quantum wells with high internal quantum efficiency using MOCVD fine growth mode control technology. The material (SPSL) was introduced into the electron blocking layer (EBL) structure of the AlGaN-based UV LED, thereby realizing the fabrication of the device.
The research results show that SPSL-EBL can improve the carrier transport characteristics of UV LED devices and reduce the turn-on voltage of the devices, so that the luminous efficiency of UV LED devices with an emission wavelength of 368 nm is increased by 101.6% compared with the traditional structure. The advent of this device will also open up a new path for the research and development of high-efficiency all-solid-state UV light sources.
8. AlGaN-based full structure deep ultraviolet LED
In December 2020, collaborators from Peking University, Songshan Lake Materials Laboratory and the Chinese Academy of Medical Sciences successfully realized an AlGaN-based full-structure deep ultraviolet LED, and based on this, a germicidal light source module with high power density was fabricated, and the Excellent performance in the killing experiment of the new coronavirus.
The researchers firstly obtained a high-crystal quality AlGaN-based deep ultraviolet LED epitaxial structure at the epitaxial end based on nano-scale patterned substrates and high-temperature MOCVD technology, and then achieved high current injection efficiency at the midstream tape-out end by designing electrode structures and exploring electrode processes. Finally, the packaging process and circuit design were optimized by using AlN ceramic substrate in the downstream, and a high-power sterilization module with excellent stability was successfully prepared.
Through the cooperation of the three parts, the assembled high-power density deep ultraviolet germicidal light source achieved instant killing of the new coronavirus in 1 second in the BSL-3 laboratory of the Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences. In the experiment with the blank control group Among them, the results of the irradiation group showed that more than 99.99% of the new coronavirus was completely killed.
This research fully demonstrates the excellent sterilization performance of AlGaN-based deep ultraviolet LEDs, which not only shows great potential for alleviating the new crown epidemic in the short term, but also provides new development ideas for the future deep ultraviolet sterilization industry.
