Cao Yongge, researcher and research leader of the Fujian Institute of Material Structure, Chinese Academy of Sciences, director of the Advanced Materials Research Office, doctoral tutor, and Distinguished Professor of Renmin University of China. With the keenness and persistence of the international frontier, we have made our own "unique" in the field of laser ceramics and optoelectronic materials.
In terms of technical strength, the center has 32 members, including 2 researchers from the “Hundred Talents Program†of the Chinese Academy of Sciences, 2 associate researchers, 7 assistant researchers, 1 engineer, 4 doctoral students, and 6 master students. Name, joint training of 3 doctoral students, joint training of 4 master students. A research team with reasonable structure, strong innovation ability and high professional level was established. In addition to research on laser transparent ceramics and LED lighting materials, this team has also made achievements in the research of ceramic-lined composite steel tubes.
Continuous improvement to create a new LED record
As a model of the third generation of green energy-saving lighting, LED has been highly valued by governments. After practice testing, LED has been successfully labeled with such high efficiency, super energy saving and green environmental protection. This is the most prominent feature of LED lighting. Therefore, LEDs are regarded as the best choice for next-generation lighting sources.
Transformation has become a trend. How to transform has become a problem that many experts and scholars think about. Researcher Cao Yongge, deputy director of the Institute of Advanced Materials Research, Institute of Materials Research, Fujian Institute of Material Structures, Chinese Academy of Sciences, and Haixi Research Institute of the Chinese Academy of Sciences (now under the Fujian Institute of Material Structure Research, Chinese Academy of Sciences) said, "LEDs must be scaled up. In the field of general lighting, we must first reduce costs, and at the same time ensure high-efficiency, high reliability, high color rendering and other technical advantages at low cost."
Cao Yongge is very clear about the development of the center. It is based on the research of light-functional ceramic materials, the research and development of key materials and technologies for semiconductor lighting, and the promotion and application of engineering and industrialization as a means to achieve breakthrough and integration of key technologies and promote advanced materials. Industrialization.
In 2011, the cross-strait LED industry scientific and technological achievements conference announced that China has invented LED fluorescent tubes with a total lighting efficiency higher than 141lm/W and has achieved industrialization. This means that the overall lighting efficiency of LED fluorescent lamps in China has set a new world record for the first time. Prior to this, the highest overall lighting effect in the world was the NSSW157A lamp developed by Japan Nichia Chemical Industry Co., Ltd. in 2011. The overall luminous efficiency was 129 lm/W. This time, the record was jointly refreshed by the Haixi Research Institute of the Chinese Academy of Sciences and Fujian Wanbang Optoelectronics Technology Co., Ltd. and Xiamen Sanan Optoelectronics Co., Ltd., which not only improved the overall light efficiency by 10%, but also costed only 1/4.
In 2012, the data showed that with the special ceramic MCOB packaging technology, China has achieved the world's highest light source efficacy of 231lm/W industrialization; at the same time realized 153lm/W (Ra>82) industrialized indoor lighting bulb lighting Efficiency, and recent laboratory results show that when Ra=92, the overall lighting efficiency can reach 168lm/W. This is one of the highest data reported at the time in the world. It is no less than the light source effect of Cree's high-end chip package, but the cost is only 1/10 of Cree's.
In October of the same year, he realized the light efficiency of the laboratory light source of 261lm/W white LED by using the transparent ceramic phosphor developed by himself. It was the highest light source effect at home and abroad at that time. In 2013, through the appraisal of the results of the Chinese Academy of Sciences, three academicians and nine experts in the field of semiconductors at home and abroad have been evaluated. The low-cost, high-reliability and high-efficiency ceramic-based multi-functional improved MCOB package integration technology developed in 20131 On the 31st of the Chinese Academy of Sciences, the identification of the results was recognized by experts as "the comprehensive performance and technical level reached the international leading level."
Independent research and development to remove the "crown pearl"
As one of the two most important materials for laser development in the future, laser transparent ceramics have received great support and attention from governments around the world. In Japan and the United States, hundreds of kilowatts of laser output in the field of laser transparent ceramics has become a reality, but the embargo and technical importance of materials have forced China to quickly recognize a reality - it must be developed independently, in order to "full of food and clothing."
After several years of research, Cao Yongge realized that the bottleneck of laser ceramic preparation lies in the high-temperature and high-vacuum sintering equipment and preparation process that are extremely demanding on performance. However, the gap between high-temperature and high-vacuum technology and foreign technology in China is more than 15 years. In order to make a breakthrough in technology, after returning to China, Cao Yongge used his long-term technical experience in high-temperature equipment and ultra-high vacuum at home and abroad to absorb the advantages of foreign high-temperature and high-vacuum equipment, based on local, and independently designed and developed three generations. Ultra-high vacuum high-temperature sintering furnace for high-temperature and high-vacuum equipment, its key performance high-temperature vacuum is two orders of magnitude superior to that of foreign countries, which not only provides better driving force for pore removal and a cleaner sintering environment for high-temperature vacuum sintering of laser ceramics. The optical uniformity, mechanical uniformity and strain uniformity of the product are also guaranteed. The achievement has obtained the national utility model patent authorization, broke through the limitations of foreign high-temperature and high-vacuum technology, and laid a solid equipment foundation for the complete localization of high-quality large-size laser transparent ceramics.
From a process point of view, in order to find a new path, Cao Yongge's research group used a special powder surface activation and granulation method to prepare high-activity, monodisperse, spherical, and high-purity YAG ceramic nanometers using a new non-equilibrium preparation technique. The powder significantly reduces the sintering temperature, avoids the abnormal growth of the crystal grains, realizes near-non-porous sintering, and reduces the scattering loss of the ceramic. Then, it uses the self-developed high-pressure grouting technology and the wet forming theory to solve the problem. The serious problem of ceramic particle deformation and hard agglomeration during ceramic molding helps to increase the density of ceramic sintering and the transmittance of ceramics. Subsequently, they use the appropriate sintering aids to perform thermodynamics during sintering of ceramic green bodies. The kinetic control realizes grain boundary regulation and microstructure control, and obtains thin and pure grain boundaries and uniform grain size and few micropores, which greatly reduces the inherent scattering loss of ceramics.
Through independent research and development of new equipment and innovative processes, in 2008, Cao Yongge's research group prepared Nd:YAG laser transparent ceramics with theoretical transmittance and single crystal level. The laser efficiency reached 56.7%, and in 2013, 5 kW output was realized. Together with the Silicon Institute, China has become the third country to realize single-chip single-stage kilowatt ceramic laser output after Japan and the United States.
Perfect innovation LED hand ceramic technology
Under the support of the major projects of Fujian Province and the important directional projects of the Chinese Academy of Sciences, Cao Yongge opened up a new research direction of LED semiconductor lighting in the Fujian Institute of Construction of the Chinese Academy of Sciences, and built a research and development platform for the pilot production line of LED packaging. He combines the advantages of ceramic technology with LED packaging technology. Based on foreign research and development, combined with domestic technology and market characteristics, he developed high-performance, low-cost semiconductor lighting LED bulb packaging key materials and technologies for indoor lighting, including high Thermal insulation ceramic substrate technology, new optical design, new non-In transparent electrode, low current drive high efficiency and low cost LED packaging technology; he invented "four in one function" ceramic thin film LED packaging technology, metal substrate direct die bonding technology, ceramic COB Package diffuse optical design, transparent ceramic LED packaging technology, chip post-processing high light-emitting technology, etc. Among them, transparent ceramic packaging technology and multi-functional ceramic film COB packaging technology break the traditional LED packaging route, with important originality, not only break through the international The patented blockade solves the problem of high stability, high luminous efficiency and low cost of LED.
Through this series of technology research and development, he achieved the goal of reducing the cost of the entire lighting and electric conversion efficiency (the whole lamp 150lm/w) higher than the similar products at home and abroad (70-100lm/w) by nearly 4 times. Its price has reached the level equivalent to ordinary energy-saving lamps, breaking through the high cost bottleneck of LED lamps entering indoor lighting. The technology was transferred to Fujian Putian Wanbang Photoelectric Co., Ltd., with a total output value of 500 million yuan.
This achievement has aroused great concern in the industry. Many large LED companies have expressed their hope for comprehensive and in-depth cooperation. Cao Yongge was awarded the 2010 Fujian Yunsheng Youth Technology Award and was elected as the Secretary General of the Fujian Semiconductor Lighting Industry Alliance in January 2011. The direction of semiconductor lighting led by him has also developed into an important research direction of the Institute of Physical Education. It has received strong support from the Chinese Academy of Sciences, Fujian Province, the Ministry of Science and Technology, the Fund Committee, and the National Development and Reform Commission. It has become an important demonstration unit in the field of LED packaging in the Chinese Academy of Sciences and has been upgraded to One of the five key cultivation directions of the Haixi Research Institute of the Chinese Academy of Sciences and one of the three major breakthrough research directions.
It is reported that after five years of exploration and research and development, Cao Yongge has cooperated with Qingdao Yitong Machinery Co., Ltd. to successfully develop a 10-meter ultra-long high-speed centrifuge with good dynamic balance structure, and successfully developed a complete set through special formulation and process research and development. Ultra-long, thin-walled, smooth, non-porous, strong bonding ceramic lining steel pipe technology. At present, the technology has achieved the transformation of results, achieving an annual income of 8.6 million yuan, with good market development prospects.
(This article is reproduced on the Internet. The texts and opinions expressed in this article have not been confirmed by this site, nor do they represent the position of Gaogong LED. Readers need to verify the relevant content by themselves.)
In terms of technical strength, the center has 32 members, including 2 researchers from the “Hundred Talents Program†of the Chinese Academy of Sciences, 2 associate researchers, 7 assistant researchers, 1 engineer, 4 doctoral students, and 6 master students. Name, joint training of 3 doctoral students, joint training of 4 master students. A research team with reasonable structure, strong innovation ability and high professional level was established. In addition to research on laser transparent ceramics and LED lighting materials, this team has also made achievements in the research of ceramic-lined composite steel tubes.
Continuous improvement to create a new LED record
As a model of the third generation of green energy-saving lighting, LED has been highly valued by governments. After practice testing, LED has been successfully labeled with such high efficiency, super energy saving and green environmental protection. This is the most prominent feature of LED lighting. Therefore, LEDs are regarded as the best choice for next-generation lighting sources.
Transformation has become a trend. How to transform has become a problem that many experts and scholars think about. Researcher Cao Yongge, deputy director of the Institute of Advanced Materials Research, Institute of Materials Research, Fujian Institute of Material Structures, Chinese Academy of Sciences, and Haixi Research Institute of the Chinese Academy of Sciences (now under the Fujian Institute of Material Structure Research, Chinese Academy of Sciences) said, "LEDs must be scaled up. In the field of general lighting, we must first reduce costs, and at the same time ensure high-efficiency, high reliability, high color rendering and other technical advantages at low cost."
Cao Yongge is very clear about the development of the center. It is based on the research of light-functional ceramic materials, the research and development of key materials and technologies for semiconductor lighting, and the promotion and application of engineering and industrialization as a means to achieve breakthrough and integration of key technologies and promote advanced materials. Industrialization.
In 2011, the cross-strait LED industry scientific and technological achievements conference announced that China has invented LED fluorescent tubes with a total lighting efficiency higher than 141lm/W and has achieved industrialization. This means that the overall lighting efficiency of LED fluorescent lamps in China has set a new world record for the first time. Prior to this, the highest overall lighting effect in the world was the NSSW157A lamp developed by Japan Nichia Chemical Industry Co., Ltd. in 2011. The overall luminous efficiency was 129 lm/W. This time, the record was jointly refreshed by the Haixi Research Institute of the Chinese Academy of Sciences and Fujian Wanbang Optoelectronics Technology Co., Ltd. and Xiamen Sanan Optoelectronics Co., Ltd., which not only improved the overall light efficiency by 10%, but also costed only 1/4.
In 2012, the data showed that with the special ceramic MCOB packaging technology, China has achieved the world's highest light source efficacy of 231lm/W industrialization; at the same time realized 153lm/W (Ra>82) industrialized indoor lighting bulb lighting Efficiency, and recent laboratory results show that when Ra=92, the overall lighting efficiency can reach 168lm/W. This is one of the highest data reported at the time in the world. It is no less than the light source effect of Cree's high-end chip package, but the cost is only 1/10 of Cree's.
In October of the same year, he realized the light efficiency of the laboratory light source of 261lm/W white LED by using the transparent ceramic phosphor developed by himself. It was the highest light source effect at home and abroad at that time. In 2013, through the appraisal of the results of the Chinese Academy of Sciences, three academicians and nine experts in the field of semiconductors at home and abroad have been evaluated. The low-cost, high-reliability and high-efficiency ceramic-based multi-functional improved MCOB package integration technology developed in 20131 On the 31st of the Chinese Academy of Sciences, the identification of the results was recognized by experts as "the comprehensive performance and technical level reached the international leading level."
Independent research and development to remove the "crown pearl"
As one of the two most important materials for laser development in the future, laser transparent ceramics have received great support and attention from governments around the world. In Japan and the United States, hundreds of kilowatts of laser output in the field of laser transparent ceramics has become a reality, but the embargo and technical importance of materials have forced China to quickly recognize a reality - it must be developed independently, in order to "full of food and clothing."
After several years of research, Cao Yongge realized that the bottleneck of laser ceramic preparation lies in the high-temperature and high-vacuum sintering equipment and preparation process that are extremely demanding on performance. However, the gap between high-temperature and high-vacuum technology and foreign technology in China is more than 15 years. In order to make a breakthrough in technology, after returning to China, Cao Yongge used his long-term technical experience in high-temperature equipment and ultra-high vacuum at home and abroad to absorb the advantages of foreign high-temperature and high-vacuum equipment, based on local, and independently designed and developed three generations. Ultra-high vacuum high-temperature sintering furnace for high-temperature and high-vacuum equipment, its key performance high-temperature vacuum is two orders of magnitude superior to that of foreign countries, which not only provides better driving force for pore removal and a cleaner sintering environment for high-temperature vacuum sintering of laser ceramics. The optical uniformity, mechanical uniformity and strain uniformity of the product are also guaranteed. The achievement has obtained the national utility model patent authorization, broke through the limitations of foreign high-temperature and high-vacuum technology, and laid a solid equipment foundation for the complete localization of high-quality large-size laser transparent ceramics.
From a process point of view, in order to find a new path, Cao Yongge's research group used a special powder surface activation and granulation method to prepare high-activity, monodisperse, spherical, and high-purity YAG ceramic nanometers using a new non-equilibrium preparation technique. The powder significantly reduces the sintering temperature, avoids the abnormal growth of the crystal grains, realizes near-non-porous sintering, and reduces the scattering loss of the ceramic. Then, it uses the self-developed high-pressure grouting technology and the wet forming theory to solve the problem. The serious problem of ceramic particle deformation and hard agglomeration during ceramic molding helps to increase the density of ceramic sintering and the transmittance of ceramics. Subsequently, they use the appropriate sintering aids to perform thermodynamics during sintering of ceramic green bodies. The kinetic control realizes grain boundary regulation and microstructure control, and obtains thin and pure grain boundaries and uniform grain size and few micropores, which greatly reduces the inherent scattering loss of ceramics.
Through independent research and development of new equipment and innovative processes, in 2008, Cao Yongge's research group prepared Nd:YAG laser transparent ceramics with theoretical transmittance and single crystal level. The laser efficiency reached 56.7%, and in 2013, 5 kW output was realized. Together with the Silicon Institute, China has become the third country to realize single-chip single-stage kilowatt ceramic laser output after Japan and the United States.
Perfect innovation LED hand ceramic technology
Under the support of the major projects of Fujian Province and the important directional projects of the Chinese Academy of Sciences, Cao Yongge opened up a new research direction of LED semiconductor lighting in the Fujian Institute of Construction of the Chinese Academy of Sciences, and built a research and development platform for the pilot production line of LED packaging. He combines the advantages of ceramic technology with LED packaging technology. Based on foreign research and development, combined with domestic technology and market characteristics, he developed high-performance, low-cost semiconductor lighting LED bulb packaging key materials and technologies for indoor lighting, including high Thermal insulation ceramic substrate technology, new optical design, new non-In transparent electrode, low current drive high efficiency and low cost LED packaging technology; he invented "four in one function" ceramic thin film LED packaging technology, metal substrate direct die bonding technology, ceramic COB Package diffuse optical design, transparent ceramic LED packaging technology, chip post-processing high light-emitting technology, etc. Among them, transparent ceramic packaging technology and multi-functional ceramic film COB packaging technology break the traditional LED packaging route, with important originality, not only break through the international The patented blockade solves the problem of high stability, high luminous efficiency and low cost of LED.
Through this series of technology research and development, he achieved the goal of reducing the cost of the entire lighting and electric conversion efficiency (the whole lamp 150lm/w) higher than the similar products at home and abroad (70-100lm/w) by nearly 4 times. Its price has reached the level equivalent to ordinary energy-saving lamps, breaking through the high cost bottleneck of LED lamps entering indoor lighting. The technology was transferred to Fujian Putian Wanbang Photoelectric Co., Ltd., with a total output value of 500 million yuan.
This achievement has aroused great concern in the industry. Many large LED companies have expressed their hope for comprehensive and in-depth cooperation. Cao Yongge was awarded the 2010 Fujian Yunsheng Youth Technology Award and was elected as the Secretary General of the Fujian Semiconductor Lighting Industry Alliance in January 2011. The direction of semiconductor lighting led by him has also developed into an important research direction of the Institute of Physical Education. It has received strong support from the Chinese Academy of Sciences, Fujian Province, the Ministry of Science and Technology, the Fund Committee, and the National Development and Reform Commission. It has become an important demonstration unit in the field of LED packaging in the Chinese Academy of Sciences and has been upgraded to One of the five key cultivation directions of the Haixi Research Institute of the Chinese Academy of Sciences and one of the three major breakthrough research directions.
It is reported that after five years of exploration and research and development, Cao Yongge has cooperated with Qingdao Yitong Machinery Co., Ltd. to successfully develop a 10-meter ultra-long high-speed centrifuge with good dynamic balance structure, and successfully developed a complete set through special formulation and process research and development. Ultra-long, thin-walled, smooth, non-porous, strong bonding ceramic lining steel pipe technology. At present, the technology has achieved the transformation of results, achieving an annual income of 8.6 million yuan, with good market development prospects.
(This article is reproduced on the Internet. The texts and opinions expressed in this article have not been confirmed by this site, nor do they represent the position of Gaogong LED. Readers need to verify the relevant content by themselves.)
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