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Lead-Free Sintered Adhesives for High-Brightness Light Emitting Diode (HB-LED) Thermal Management
Keywords: Thermal Management, Die-Attach, HB-LEDs
Many nascent electronics systems aimed at fostering environmental sustainability in the United States and abroad require sophisticated thermal management packages to operate efficiently and effectively. A number of industries are aggressively developing innovative product lines centered on the concept of energy efficiency, including hybrid electric vehicles (HEV) in the automotive sector, high-brightness light emitting diodes (HB-LED) in commercial lighting, and concentrator photovoltaics (CPV) for utility-scale electricity, to name a few. One of the largest obstacles to the widespread commercialization of these applications, however, is cost-effective thermal management. Improvements to the bonding technologies that hold the device components together must be developed to ensure consistent performance, long operational lifetimes, and cost-competitiveness. To address this issue, transient liquid phase sintered (TLPS) adhesives that form metallurgical bonds with solderable device components can provide an order of magnitude or better thermal performance than existing conductive adhesive technologies. These materials are processed like adhesives but provide the electrical and thermal performance of solders. Effective (bond-line) thermal conductivity in excess of 50 W/m-K has been demonstrated, as has volume resistivity below 50 Ohm-cm at bondline thicknesses under 1 mil (< 25 m). Initial material level characterization reveals robust bonds that do not deteriorate after accelerated aging or thermal cycling. These low]cost, lead]free and RoHS compliant materials are designed as drop]in replacements for existing manufacturing processes. In this paper we will present the initial results of thermal resistance measurements of commercial HB-LED packages utilizing lead-free TLPS as the die-attach material.
Matthew Wrosch, Vice President, Business Development
Creative Electron, Inc.
San Marcos, CA

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