Youyan New Materials Co., Ltd. (hereinafter referred to as "Youyan New Materials"), formerly known as Youyan Semiconductor Materials Co., Ltd., is a joint-stock company exclusively established by Beijing Nonferrous Metals Research Institute. The company was established in March 1999 and listed on the Shanghai Stock Exchange with the stock code of 600206. The company is mainly engaged in the research and development and production of new materials such as rare earth materials, photoelectric thin film materials, biomedical materials, rare metals and precious metals, infrared optical and photoelectric materials, and optical fiber materials. It is the backbone enterprise of China nonferrous metal new material industry. There are 10 enterprises controlled or indirectly controlled by Yan Xincai.