On December 8, 2011 , GT Advanced Technologies Inc. (NASDAQ: GTAT) published a case study detailing the findings of a series of blind material studies that evaluated sapphire color versus LED The impact of the manufacturing process.
Studies have shown that all sapphires show color at the core, regardless of source, and the pink color of the GT Advanced Sapphire Furnace (ASFTM) material does not indicate that the gems contain impurities. The pink ASF sapphire does not adversely affect the LED manufacturing process and does not require any other Steps or cost more to remove the pink. In addition, studies have shown that GT ASF pink sapphire material can be used to produce LED wafers with the lowest absorption rate and highest transfer speed among the samples tested.
All studies were performed using blind samples of GT ASF sapphire material and LED grade sapphire from other sources. Case study results from independent Glow Discharge Mass Spectrometry (GDMS) analysis and high-brightness (HB) LED device manufacturing studies, high-brightness (HB) LED device manufacturing research using photothermal common optical interferometer (PCI) analysis get on.
Cheryl Diuguid, vice president and general manager of the sapphire materials and equipment division, said: "GT has been supplying sapphire to the LED industry for more than 12 years. These studies further validate the positive feedback we have heard from material customers for a long time - ASF sapphire growth material With excellent quality and performance, although it has a bit of pink. The findings of recent case studies confirm what we have learned for a long time that GT's ASF tool produces the best quality sapphire material and shows the LED manufacturer The most important traits include serious defects such as little or no air bubbles, key LED wafer parameters such as surface roughness (Ra), total thickness variation (TTV), curvature and curvature, and ultimately high wafer yield. good performance."
This new study is part of a broader material characterization project initiated by GT to study the impact of sapphire material properties on the overall manufacturing process of the high-brightness LED value chain. The company will announce the findings of the color case study at the High-Tech LED Conference in Shenzhen, China, from December 9th to 10th. The case study report is also posted on the company's website at The company also published a common problem document on assessing the important qualities of sapphire material quality. This FAQ file is also available at
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