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Quality Dispensing for Tight CIE and Narrow Side-View LED
Keywords: CIE, side view, dispensing
The white LED market has been emerging rapidly in the past few years and its growth potential is quite bright for the future. The largest market driver is display backlighting for TVs, tablet PCs, and e-Readers as well as illumination LED lamps. Manufacturers of LEDs are aiming for tight CIE, or bins, as the most important differentiator regardless of end-application. Silicone phosphor dispensing is critical for LED color quality, and therefore tight CIE. Many of the problems incurred in silicone phosphor cavity fill can be solved, and costs reduced, with automated dispensing systems developed for LED applications. Especially as tablet PCs and e-Readers are emerging, many LED manufacturers are focusing on a specific LED package, namely the side-view LED. As tablet PCs become thinner, so do the side-view LEDs, which introduces further challenges for silicone phosphor dispensing. Until recently, silicone phosphor dispensing was done with a needle dispenser; however, jet dispensing is also being used now. Although using a jet is a relatively new dispensing method for silicone phosphor, jetting technology itself has been around for over 20 years and offers many advantages. This paper will address the methodology and effectiveness of silicone phosphor jet dispensing for tight CIE and narrow cavity LED production, and cost reduction.
Akira Morita, Business Development Manager
Nordson Asymtek
Carlsbad, CA
USA


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