High power LED product luminous efficiency up to 80lm/W

Blue LED (Sapphire) is currently on sapphire substrate, but itself is not conductive and difficult heat dissipation problems, resulting in the LED grain mill in recent years devoted to new technology, and the direction toward the metal substrate to develop.

Taiwan manufacturers in the past in the field of LED technology, with most Japanese companies go, the metal substrate technology development process, is the starting point of difference, Taiwan is also the business opportunity. In Taiwan grain factory, SemiLEDs (SemiLEDs) has developed a metal substrate vertical structure of the blue LED, and the amount of the luminous efficiency has reached 6080lm/W. The level is currently using the energy production of traditional Sapphire substrate structure of 50lm/W is much higher, the future is expected to import more large LED production. The first to enter the mass production of SemiLEDs said that in some room for improvement has been under the direction of the end of 2007, estimated amount of products can be challenging 100lm/W levels. The vertical structure of the metal substrate to improve the brightness of using Sapphire as the substrate of blue LED process is the mainstream, but it is not conductive, P and N poles need to be put on the same side, in order to form the electro-optical conversion, and thermal conductivity is poor, for the large size of LED, the current is not easy and difficult problems by heat therefore, LED, is on the new plant grain structure. Since about 20032004 years, the Taiwan LED industry gradually rise to the metal substrate and the use of technology wave vertical structure, and there are more and more manufacturers agree, leading manufacturers Nichia in 2004 (Nichia) published a new process using CuW as substrate bonding. But the subsequent development is not clear, the domestic manufacturers in the market investigation, the company's Blu ray LED are still using the Sapphire substrate. It was founded in Silicon Valley, but the research and development, manufacturing and business are located in the Taiwan SemiLEDs SemiLEDs has developed, with a copper alloy as the foundation, the vertical structure of the blue LED, and at the end of 2005 into mass production. Uses the structure of 40 mil 350mA Blu ray LED best package, the luminous efficiency measured in Taiwan has reached 6080lm/W, with Luxeon male mold package Lumileds, luminous efficiency can reach 5070lm/W. Compared to the general Sapphire substrate for the luminous efficiency of the 50lm/W level, the efficiency has been improved a lot.

And in the improvement of the existing direction, by the end of 2007 to the luminous efficiency of 100lm/W as target. The company's current luminous efficiency level is lower than about 15% Cree, then perhaps the gap can be narrowed. SemiLEDs was founded only 2 years ago, because the company scale is limited, at present mainly in the development of high power blue LED manufacturing, the future does not rule out the breakthrough four yuan LED, may also enter the low power LED development is currently most widely used in the field of the bulk market. Following us with several pictures to illustrate the metal vertical structure and different substrate Sapphire. Said: the new generation of InGaN technology in vertical profile. Due to the thermal conductivity of copper, with a copper alloy substrate, and because the characteristics of metal opaque will reduce light out, so add a mirror as a reflective layer; surface roughening treatment continuation technology, improve the total reflection angle makes the upgrade rate of light. (source: SemiLEDs) said: the comparison of the traditional Sapphire plate and metal vertical structure. Sapphire substrate is not conductive, relatively low thermal conductivity, low reflectivity; metal substrate thermal conductivity, high thermal conductivity, high reflectivity (plus a mirror). (source: SemiLEDs) said: thermal resistance analysis of different structure, Sapphire structure LED bigger size, higher thermal resistance; it can provide a lower Xuming thermal resistance. (source: SemiLEDs)