The dust settled, and the first prize of the 2015 National Science and Technology Invention Award was officially announced today. The project “High-efficiency GaN-based blue light-emitting diode on silicon substrate†(referred to as silicon substrate) won this title. After ten years of grinding a sword, silicon substrate LED technology has finally entered a new journey, and its large-scale application is just around the corner.
Due to the difficulty of production technology, silicon substrates have been controversial from the beginning and are not favored by the industry. This award means that the technical bottleneck of the silicon substrate has almost broken, and it has also released a great signal to the market development of the silicon substrate, and the prospect is considerable. Industry economists have said that under the background of declining cost silicon substrate technology, such as access to capital if vigorously pursued, LED industry structure is expected to be remodeling.
Technological breakthrough: comparable to the growth level of sapphire substrates
"We use a new generation of stress control technology to eliminate the problem that the epitaxially grown GaN film on the silicon substrate is prone to cracking, and effectively filter the defects such as dislocations. The crystal quality of GaN is comparable to that of the sapphire flat substrate.
On the material platform of silicon-based GaN, we have developed efficient quantum well growth technology and P-type doping technology. The chip fabrication of the silicon-based GaN LED adopts a vertical structure, specifically including a high-efficiency mirror and a nitrogen surface roughening technique, which significantly improves the light extraction efficiency of the LED.
In addition, we have developed ceramic package and direct white chip technology for the characteristics of silicon-based GaN thin film LED chips . Overall, in the past four years, we have developed a new set of silicon-based GaN blue and white LED technology from epitaxy, chip to package. Dr. Sun Qian, vice president of silicon-based LED research and development at Jingneng Optoelectronics (Jiangxi), one of the main participants of the project, said in an interview with Aladdin News Center.
He also said that in terms of light-emitting wavelength and market applications, in addition to blue and white light products, Jingneng Optoelectronics developed a UV-based LED substrate in 2015, which can be used in curing, printing, nail art, etc. The customer's praise. In terms of cost reduction, it has been transferred to a large-sized silicon substrate. At present, GaN-based LEDs on 4-inch silicon substrates have been mass-produced, and the development and test of 6-inch silicon substrate LEDs have made good progress. With the help of automated process lines, it is expected to significantly increase production efficiency and product yield, and effectively reduce manufacturing costs.
Industrial layout: the market model of innovative production and research has begun to take effect
It is reported that Jiangxi Province is committed to building a 100 billion-level LED industry cluster. The communique also released the "Implementation Plan for Building Jiangxi LED Industry Base in Nanchang Optics Valley" on the 4th (hereinafter referred to as the program).
It is worth noting that Jiangxi Province wants to vigorously support the development of the entire industrial chain of silicon-based LED technology, and will adopt a model of silicon-based LED technology cooperation for industrial development to promote the radiation of silicon-based LED technology. The plan proposes to adhere to the basic principles of independent development and the use of external forces, relying on the advantages of silicon-based LED original technology, stimulating endogenous power to accelerate the pace of industrialization, and enhance the status and influence of silicon-based LEDs in the international arena.
The consulting program found that A-share listed companies Lianchuang Optoelectronics , Mulinsen, Hongli Optoelectronics , and Sunshine Lighting were included in the above development plan. "From the invention of colleges and universities, to the support of the government, to the joint practice of industrial capital of listed companies, this is a very beautiful chain of innovation, and I hope they can become a benchmark," said an industry economist.
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