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1.1.4 Status LED circuit development abroad
Research and development of semiconductor lighting technology has attracted worldwide attention to research institutions and enterprises. There are nearly 200 foreign companies involved in the development of GaN devices, materials and equipment, nearly 300 universities and research institutes involved in the development of GaN. At present, the power white LED luminous efficacy (the luminous efficiency) has been achieved 100 lm / W, research level has reached 160 lm / W. Through technology development and market competition, the world& acute;s leading LED manufacturers have formed their technical characteristics. Nichia Chemical is a global technology leader, the monopoly of high-end white, blue and green LED market, Toyoda Gosei and white LED lamp illumination technology development, according to the international front end; the growth of the silicon carbide substrate American Cree GaN epitaxial wafer international leader, traditional lighting giant Philips Lumileds absolute control of the United States leading international power white LED; traditional lighting giant Osram Osram holding Opto Semiconductors Osram power LED package and vehicle development with international leading LED lamps.