Some people say that the LED industry grew based on sapphire. That’s because sapphire, the preferred crystal material used to produce LED chips, accounts for 85% of all substrate materials used in LED manufacturing. Generally speaking, sapphire substrate accounts for up to 20% of the cost of LED products, making it the most expensive material in the LED supply chain. It can be seen from this that if a cheaper and more beautiful material can be found to replace sapphire, it will have an obvious effect on reducing the cost of LED production and allowing it to eventually enter the homes of ordinary people. This is what Li Guoqiang and his LED Epitaxial Materials and Devices Research Group at the State Key Laboratory of Luminescent Materials and Devices of South China University of Technology do. "If many people can live a healthier and more convenient life because of our research results, it will be a great honor for a scientific researcher." Letting technology change life is the biggest wish of him and his team.
Li Guoqiang, 35, is a professor and doctoral supervisor at South China University of Technology, and the winner of the 2013 Guangdong Natural Science Outstanding Youth Fund. Mainly engaged in research on III-V compound semiconductor materials and devices, and has hosted a number of national, provincial and ministerial level scientific research projects. Over the years, Li Guoqiang and his team have achieved fruitful results in their research on using new materials to replace sapphire. They used different new substrate materials for the epitaxial growth of III nitride films, promoting blue and white light LED technology based on new substrates; they studied the defect microstructure and defect formation mechanism of III-V compound semiconductors, effectively improving the quality of LED epitaxial chip materials; they proposed a graphic substrate design idea, and developed relevant software based on it, thereby designing a variety of new graphic substrate solutions, which greatly improved LED light efficiency. Relevant research results have been cooperated with leading companies in the domestic LED industry and have produced good economic benefits.
Their research results have been highly recognized by the Royal Society of Chemistry (RSC), an internationally renowned academic publishing organization. For example, RSC's Journal of Materials Chemistry is a highly influential journal in the materials and chemistry community. C (SCI Area 1 Magazine, IF=6.1) published a research result of the team in the form of a back cover article of the fifth issue published on February 7, 2014. It used a striking text to evaluate the research direction and results of the team: "The optoelectronic semiconductor team led by Professor Li Guoqiang is affiliated to the National Key Laboratory of Luminescent Materials and Devices of South China University of Technology and is promoting the development of new compound semiconductor materials and devices."
Another report by the team on the research results on the preparation of blue LEDs on new patterned substrates was published as the cover article of the 6th issue of Crystal Growth & Design (IF=4.7) of the American Chemical Society (ACS), an authoritative journal on crystal growth, published on June 6, 2012. Then, "Semiconductor Today", an internationally renowned magazine with strong influence and status in the semiconductor industry and academia, listed "Optimizing spherical cap patterned sapphire for nitride semiconductor" in its representative results in September 2013. "LEDs", a two-page special report on the team's work on the design of new patterned substrates and the production of LED devices was held. It was believed that the paper's "LEDs on spherical cap-shaped patterned substrates are of great significance for improving the light extraction efficiency of nitride LEDs." And commented that because "the pattern height of the new patterned substrate is low, the processing time of the pattern is short, which helps to reduce processing time and cost, which is very important for the LED industry."Large-scale industrial production is of great significance. "
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