Tanaka Kikinzoku develops new technology to prevent cracks in quartz glass

Tanaka Kikinzoku Kogyo (Chiyoda-ku, Tokyo) has developed a technology that prevents the cracking of glass during the encapsulation of deep-ultraviolet LEDs, which is conducted using quartz glass and gold-tin solder. Deep-UV LEDs are utilized in equipment such as sterilizers. Tanaka Kikinzoku’s new technology prevents the cracking caused by the difference in thermal expansion between glass and solder, by controlling the shape and size of the solder beads on the glass periphery. Consequently, the encapsulation defect rate, which was previously 90%, has been reduced to nearly zero. The company has started to ship prototypes of a product called SKe-Li, in which gold-tin solder is pre-applied to quartz glass. The use of the technology for items other than deep-UV LEDS is also expected; high-transparency quartz glass may be utilized as a cover material for semiconductor lasers and automotive sensors.

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