In booth #1933B at the LightFair International 2014 exhibition in Las Vegas (3-5 June), LatticePower of Nanchang, Jiangxi Province, China – which claims to be the first firm to commercialize gallium nitride on silicon (GaN-on-Si) LEDs – is displaying its next generation of light fixtures, including new proprietary GaN-on-Si LED track, high-bay and flood fixtures.
LatticePower says that growing GaN material on a silicon substrate has been a vexing problem for the industry as a result of the material lattice mismatch and thermal expansion mismatch between GaN thin film and silicon substrate. These mismatches contribute to defects in the material, cracking on the wafer, and poor quantum efficiency of the epi-layer.
By developing a series of proprietary technologies to overcome the mismatch problems, LatticePower says that it is able to manufacture consistent-quality and reliable LEDs. The firm’s GaN-on-Si LEDs offer high light density and better thermal dissipation, it is claimed.
LatticePower’s GaN-on-Si technology uses a larger-diameter (6-inch) silicon wafer fabrication process that lowers unit cost and increases throughput for significant cost reduction, resulting in a cost at least 30% lower than the equivalent top-tier sapphire process, it is reckoned.
The firm also has developed a unique system-in-package (SiP) approach that differs from others by combining integrated GaN-on-Si LEDs with a silicon-substrate-based heat-sink. This new platform permits easy scalability, low-cost production and automated manufacturing for lighting fixtures.
As a vertically integrated company, LatticePower designs, engineers and manufactures all the components in its lighting products, optimizing performance for commercial applications and reducing time-to-market at scale. The firm is hence displaying three new fixtures that use its GaN-on-Si LED technology — a track light, highbay and flood. All of LatticePower’s products are certified to international standards for the general lighting market, including indoor and outdoor applications.
