Yole analysis according to the French research institutions, in the LED lighting patent, involves the patent LED phosphors is one of the most basic, therefore, is also the most influential.
In the mid – 90 – s, the researchers Shuji Nakamura and Akasaki professor at the university of Nagoya, Japan jointly developed the first commercial GaN (gallium nitride) blue light LED. Soon, the use of some basic blue leds combined with phosphor to produce white LED patent is respectively by the day, osram, ATMI and other companies. Later, in 2005, more and more companies started the competition in LED industry, the basic patent also rapidly by more and more application products, such as mobile phones, laptops, LCD TV display screen and general lighting.
Intellectual property rights of phosphor is an important force in the LED industry. As many as 40 cases related lawsuits. Hundreds of companies involved in LED phosphors, intellectual property, most of them LED companies to list the top patent assignee. However, independent of the phosphor powder manufacturers, such as Intematix company and mitsubishi, is becoming the main force of LED phosphors intellectual property rights.
Today, the high performance silicate has been widely used as a substitute for YAG, most of the focus of the new combination development and patent protection to red and green converter. New markets and some of the most key of phosphor intellectual property mainly dominated by mitsubishi and Denka, they have respectively from NIMS (Japan’s national institute for materials science) won the nitrogen and oxygen nitrides license.
However, many other companies are also developing nitrogen and nitrogen oxides, including Intematix company, nakamura yu and Lightscape (now the dow electronic materials). Family of new materials is also viewed as promising phosphor powder, including tungstate and molybdate and GE advocated by fluoride.
According to Yole analysis, based on the thermal stability of the recent and latest progress of manufacturability, quantum dots are finally became a reliable option. In the lighting industry, red dots in combination with the use of standard phosphors may appear in the remote phosphor applications.