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P-n junction terminal voltage constitute a certain potential barrier, when the positive bias voltage drop time base, P and N the majority carrier diffusion to the other party.Due to the electron mobility is much bigger than hole mobility, so there will be a large number of electronic spreading P area, constitute of P area of minority carrier injection.These electrons and valence with hole composite, composite when the energy in the form of light energy to release out.This is the principle of PN junction glow. Led Down Light,Led Down Light Cover,Led Downlight Ceiling Down Light,Led Ceiling Down Light NINGBO ZHENHAI BOLANG METAL PRODUCT FACTORY , https://www.aldiecastings.com
At present, Rohm and Haas Company has established a total of 14 production facilities and R&D centers in China, of which the strongest is the electronic materials and coatings business. The Rohm and Haas Printed Wiring Board (PWB) business expanded to Asia, especially China, and has now established an electronic chemical crystal production facility for PWB production in Dongguan, China. MacDermid has electronic chemical production facilities in Panyu and Hong Kong, China, and now builds new installations in Shanghai to strengthen its position in the Chinese electronic chemicals market. The company’s sales in Asia Pacific account for 15% of its total sales revenue, and it is estimated that this ratio will increase in the future.
Japan's Stellar Hydrofluoric Acid (HF) producer Stella Chemical Co., Ltd. invested US$5 million to form a joint venture with a company in China's Shigeru River. The 10,000-ton/year anhydrous HF plant that was built was put into operation at the end of the 2nd year. The HF produced is purified to the electronic grade by Stella Chemical Company, Osaka and Singapore. Stella Chemical Company's share of high-purity HF in the electronics industry has reached 60% to 70% of total products.
US Rockwood Electronic Chemicals invested US$6 million in Suzhou Wuzhong Economic Development Zone to build an electronic chemical device. Its supporting service center was operational at the end of 2003, and production facilities were put into production in March 2004. The products are various printed circuit board chemicals, including the Shadow brand products used for direct metal plating processes, as well as copper additives and etchant.
The internationally renowned chemical and pharmaceutical company, the German company Merck Group, also increased its investment in China. The Merck Group has established an electronic chemical analysis laboratory at the Zhangjiang Hi-Tech Park in Pudong, Shanghai, China. It provides all semiconductor and liquid crystal manufacturers in China with chemicals inspection and analysis services. Since in the past there was no electronic-grade chemical analysis room to provide instant services in China, most of the demand for chemical detection and analysis services in the semiconductor and liquid crystal display industry in China has been subject to factory analysis reports, shipments to foreign countries or other laboratories. Provide temporary support. Therefore, the establishment of the laboratory is of great significance.
Asia United Electronic Chemicals (Taiwan) and Shanghai Huayi (Group) Company formed a joint venture last year, invested 20 million US dollars to build liquid electronic chemical devices in Shanghai. The joint venture uses the raw materials provided by Huayi to produce high-purity liquid chemicals, including acetic acid, hydrochloric acid, slightly acid and sulfuric acid; hydrogen peroxide; ammonium fluoride and hydroxide.
US Sachem plans to invest in a production facility in Wuxi to meet the growing demand for high purity and fine chemicals used in China's electronics industry. According to plan, the first phase of high-purity electronic chemical production equipment for the semiconductor and liquid crystal display industry will be put into operation in October this year, and other production equipment will be put into operation in October 2007. By then Sachem's total tetramethylhydrazine hydroxide production capacity will increase by 30%.
Solvi's subsidiary, Interox Corporation, has also established a joint venture with Suzhou Suzhou Electronic Materials Co., Ltd. to develop the high-purity hydrogen peroxide market in China for the semiconductor industry in Suzhou. The joint venture will be put into operation in the first half of the year, with an initial production capacity of 2,000 tons/year.
Industry Concerns: Multinational Companies Speed ​​Up Investment in Electronic Chemicals in China
The rapid development of the information industry has stimulated the ever-increasing competition in the electronic chemicals market. The company is currently actively marketing products such as boron trichloride, high-purity sulfuric acid and nitric acid in China, and plans to transfer these products from Japan to China for local sales in the future. Due to the optimistic outlook for the development of the Chinese market, multinational companies are accelerating their investment in the Chinese electronic chemicals market.