Fast thyristors (Inverter Thyristor)are used for higher frequency rectification. Inverter and inverter circuit appliances.
Rectifiers have many uses, but are often found serving as components of DC power supplies and high-voltage direct current power transmission systems. Rectification may serve in roles other than to generate direct current for use as a source of power. As noted, detectors of radio signals serve as rectifiers. In gas heating systems flame rectification is used to detect presence of a flame.
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October 25, 2004... Showa Denko KK (SDK) has developed a blue light-emitting diode (LED) based on gallium nitride (GaN) having brightness at the highest level on the market. SDK will start marketing the product next year for Such growing applications as mobile phones, outdoor displays, illumination and automotive devices.
The new 12 mW LED with a flip chip structure 1) has been developed by combining SDK?s proprietary technologies for the production of compound semiconductors and hard disk media. Compared with the existing products on the market, the newly developed LED has additional advantages of low Forward voltage and low electricity consumption.
Thus, the new product is expected to be used in backlighting of liquid crystal displays (LCDs) and in photoflash units of mobile phones. further, as the unique flip chip structure provides better heat dissipation and higher reliability, the new product will find applications in Automotive devices and general illumination.
SDK is now constructing a plant in Chiba to produce 30 million units a month of GaN-based blue LED chips. Sample shipment will begin in November this year. Commercial production will start next year, and the company plans to sell 30 million units per month By year-end. SDK is planning to expand the production capacity to meet a growing demand and to increase the annual sales to ゲ0 billion in 2008.
GaN LED chips, which emit near ultraviolet to green light at wavelengths of 360-530 nm, are now used mainly in backlighting for LCDs and keypad light source for mobile phones.
With LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED LED Phosphide (AlInGaP) red LEDs for use in color displays and backlighting of LCD TV screens. It is therefore predicted that the market for GaN LEDs will continue to grow at an annual rate of 20% or more.
Since early 1970s, SDK has been in the optoelectronic materials business, producing epitaxial wafers and chips of gallium phosphide (GaP) and other types of compound semiconductors. Except for GaN, SDK has the largest share in the world market of compound semiconductors for optoelectronic devices .
The SDK is expanding the business by providing epitaxial wafers for laser diodes used in DVD/CD optical pickups2) as well as developing AlInGaP LEDs and GaN LEDs, both with exceptional brightness.
In the ongoing medium-term consolidated business plan called the ?Sprout Project,? SDK classifies the compound semiconductor operation as one of the ?strategic growth businesses,? allocating a substantial portion of its resources into the operation.
For further information, contact:
Marketing Dept.,
Electronic Materials Div.
Phone: 81-3-5470-3293
Link to original release plus technical details and graphics:
Http:// 