New AGC Quartz Lens for Deep Ultraviolet LEDs Simplifies Manufacturing
Prototyping will begin in the third quarter, and mass production is scheduled to begin in 2019.
AGC Asahi Glass recently announced that it has developed a quartz lens for deep ultraviolet LEDs. According to AGC, the lens simplifies deep ultraviolet LED manufacturing processes while reducing capital investment. Prototyping will begin in the third quarter, and mass production is scheduled to begin in 2019.
At present, the disinfection of water and air is done mainly using mercury lamps. However, because mercury has adverse effects on the human body and the environment, production of mercury lamps may be greatly limited in the future under the Minamata Convention on Mercury. Deep ultraviolet LEDs have a low impact on the environment and an extremely strong disinfectant action; as such, they are expected to be the next-generation light source that replaces the mercury lamp.
However, current deep ultraviolet LEDs have some problems. One issue involves the transparent adhesive that joins the lens and the window material, as it is expensive and is easily degraded by ultraviolet light. The second issue is related to the current solder that joins the package and window. Clients must have large-scale deoxygenation equipment at the time of hermetic sealing, and ultraviolet LED products run the risk of cracking and air leakage because the current solder is hard. As a result, thermal stress due to the differences in the coefficients of thermal expansion between the package and window directly attacks the interface of the package and window.
The newly developed quartz lens reportedly solves these problems by integrating the quartz window material and the lens with AGC’s proprietary technology so a transparent adhesive is not required. In addition, the solder developed by AGC is already overlaid. Clients can join lens and cavity by simply heating and pressing in the atmosphere, without the need for large-scale deoxygenation equipment. In addition, AGC’s special solder is soft, easing the effect of thermal stress between the package and window.
For more information, visit www.agc.com.