HEM Sapphire for LED Applications概述GT's HEM sapphire is the premier sapphire used by leading LED companies for the production of high quality wafers. HEM sapphire material is produced in a highly automated process that allows the growth of uniform crystalline structure, no bubbles or inclusions with high purity levels. This combination of attributes allows for the uniform deposition of GaN thin films during the MOCVD process. The HEM sapphire-based substrate improves yields at the device level as photoluminescence wavelengths are homogeneous.Downstream chip yields are improved because of the sapphire’s intrinsic low stress condition. AttributesGT’s HEM sapphire growth process is optimized for the production of High Brightness LED devices.Our HEM-produced sapphire meets LED requirements for material with low stress, high device yields, color binning and electrical properties.
ApplicationsGT's HEM sapphire high crystal quality and low manufacturing costs are enabling the general lighting industry to transition from fluorescent lighting to LED based lighting. Over 80% of GaN based lighting is produced using sapphire as the underlying substrate material. The leading general lighting companies have chosen HEM sapphire for their large diameter manufacturing processes. The availability of high quality C-plane sapphire in diameters up to 10” allows for economies of scale and binning reductions at the MOCVD level. Optical Homogeneity Technique Ensures High Yield
GT Crystal Systems has developed the Optical Homogeneity Technique (OHT) for material inspection, characterization and qualification.The OHT method has been optimized and improved with over 40 years of use in grading sapphire material. The OHT inspection process ensures that our sapphire meets the quality requirements of the LED Industry. All LED-grade material is free of lineage defects, has low bubble inclusions and has better than 99.996% purity levels.The crystal homogeneity is inspected using polarized light to ensure that the crystal lattice shows no lineage, slips, twins or other crystalline defects exist. Intense light sources and index matching fluids are utilized to identify inclusions and chemical analysis is conducted on the material composition to ensure high purity levels. These techniques along with over 40 years of experience interpreting the results allows vast material characterization capabilities which have been verified with independent homogeneity testing and other analytical techniques. World Class Sapphire ManufacturingGT Advanced Technologies sapphire material group, GT Crystal Systems, is located on the historic harbor in Salem MA. The facility has undergone a significant expansion that increases its manufacturing capability in order to meet the growing demands for the LED market. Our new state-of-the-art facility features full environmental controls, power backup and other systems that have significantly advanced process robustness to ensure stable production of the highest quality sapphire crystals in the world. Watch Video - "Growth Begins Here - LED Sapphire Manufacturing"
Please contact sapphiresales@gtat.com or call +1.978.745.0088 with any questions. |
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