Abstract

High power near-UV LEDs with the wavelengths ranging from 365 nm to 410 nm are released for the curing application. Owing to the superior design and the process technologies of the vertical LED on metal alloy base, the conventional mercury-based lamps can be replaced by the LED emitters providing higher reliability, longer life time, lower cost and the environmentally friendly benefits. Coupled with the silicon sub-mount package, the vertical LED can sustain very little UV output decay more than 1000 hours by the high power input of 2W-up. The external quantum efficiencies of 45% and 12% are achieved for the wavelengths of 410 nm and 365 nm, respectively, with the help of the vertical design to eliminate the current crowding issue and the optimal surface pattern to extract UV photons.

© 2010 Optical Society of America