Project Lighting - April 2008 - (Page 9)

FeAtURe Simulation technique for optimizing White-leD Design emerging innovations produce better designs, optimization, and failure analysis By ricardo Borges, Wei-choon ng & gergo letay | Synopsys | mountain View, ca | www.synopsys.com Contents Viewpoint Selecting HBLED Drivers for Lighting Apps Simulation Technique for Optimizing White-LED Design An Analytical Approach to Cooling HBLEDs Lighting News hite light-emitting diodes (LEDs) are currently a source of great research and commercial interest in view of the revolutionary energyefficiency and cost-savings potential offered by solid-state lighting. Amid a plethora of design possibilities, the most promising and cost-effective approach to producing white light is via spectral conversion of blue LED emissions using a luminescent material that encapsulates the entire LED structure. The preferred luminescent material is phosphor and its composite due to their high 9 | Project lighting | aPr 08 W spectral conversion efficiency. As white-LED designs are refined in research labs and make their way into commercial markets, the need for simulation tools to aid in the design and optimization of these promising devices is emerging. Why simulate white LEDs? LEDs are highly sophisticated optoelectronic devices. The pressing design task is to map a host of design parameters to desired output characteristics. This mapping is not direct, and the design parameters are intimately coupled to one another in a nonlinear fashion. Therefore, the designer faces enormous difficulties in correlating design parameters (such as thickness of epitaxial layers, doping distribution, quantum-well composition, electrode patterning and 3-D structural shape) to output characteristics, such as radiation spectrum (color rendering), high brightness, operating-temperature range, wall-plug efficiency, internal quantum efficiency, lifetime, and radiation pattern. A design optimized to these attributes can command a premium in a highly competitive commercial environment. Device simulation rapidly Home Page Product Training Module Online Ordering Suppliers Catalog http://www.synopsys.com http://digikey.com/ http://ad.doubleclick.net/clk;198717884;26055153;t http://ad.doubleclick.net/clk;198717989;26055167;e http://ad.doubleclick.net/clk;198717988;26055168;e http://ad.doubleclick.net/clk;198717986;26055170;v http://ad.doubleclick.net/clk;198717985;26055171;v

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Project Lighting - April 2008 Contents Viewpoint About Project Lighting Sponsor Simulation Technique for Optimizing White-LED Design An Analytical Approach to Cooling HBLEDs LED Lighting Needs Smarts to be Competitive Lighting News Enter to Win an iPhone Refernce Materials Lighting Quick Links

Project Lighting - April 2008

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