Edison Opto improves uniformity of white light with MAPLE coating technique
Aug 14, 2009 Mixing luminescence phosphor with silicone and dispensing it on a blue light emitting chip is a common packaging method of production of white LEDs. The quality of white light depends heavily on the uniformity of phosphor on the blue die. Often times, when coupling secondary lens on white LED, it will reveal yellow circling.
To improve the CCT uniformity of white LED, Edison Opto incorporates the principle of ceramic injection forming, combined with unique, patent-pending coating technique: Multi-Axial Phosphor Layer Envelope (MAPLE) process, to effectively form a thin layer of phosphor around the emitting faces of a LED. The spatial uniformity can be controlled within 3-steps McAdam ellipse and CCT variance within ±300K (Refer to Figure). Moreover, through fine tuning of the recipe, the CCT can fully satisfy various ANSI binning that are widely adapted among SSLS manufacturers.
Different from traditional phosphor gel dispensing technique, the proprietary MAPLE process can maximize the value proposition by delivering highly uniform white light. Edison Opto is going to fully implement its MAPLE technology into its range of high power LED products for lighting applications.www.edison-opto.com.tw
Author: Ray Andersson
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