Expert: LED packaging technology to be improved overall strength
China Lighting Association, the Technical Commission of the semiconductor lighting Tang Guoqing
Optical Co., Ltd. Shanghai Branch Rui Li Ying Engineering Center
China LED enterprises are to achieve a place in the competition, the need to strengthen cooperation with international companies, such as links in the chip and package to do more work.
Along with the increased attention on energy conservation and the implementation of China's LED industry is very fast, not only showed us the production of LED power, more performance as we have gradually grown into an LED to use power.
LED wide range of applications
2008 Beijing Olympic Games for the LED provides a good stage: 496 000 RGB High power LED light up Water Cube, the device successfully; red, yellow, white-power LED and their success nest "Red China." Moreover, in addition to high-power products, the traditional oval lamp, SMD LED SMD type also successfully applied in different areas Olympics: Pangu Plaza 7 giant full-color video display, the opening ceremony of the Olympic Games Bird's Nest central floor LED screen, the performers LED decorative lamp body, the air rises LED light source with the Olympic rings, stands on the nest site and made available to the broadcast audience watching the LED screen, the opening countdown to the 2008 pottery with the use of touch-LED light source and so on.
In fact in addition to the Olympic Games, LED use in China has very wide, can be expressed mainly in the following areas:
1. Landscape Lighting
Currently, Shanghai, Xiamen, Beijing, Dalian, Nanchang and some medium and large cities have well established landscape lighting to complete the corresponding LED lighting demonstration project. These demonstration projects in cities led the successful completion of LED lighting products in the further development of county-level cities. Chongqing, for example, in July of this year has been basically completed the night LED landscape lighting demonstration project, the main city of the central business district and the district landmark lighting, has basically spend intelligent LED lighting systems. Which, LED power consumption is only ordinary light 1 / 10, if by Chongqing 200000 traditional night lighting calculations, Chongqing, lighting electricity savings per year of more than 1 billion, so widespread use of LED but trend.
2. Display
The application displays more common, present in the advertising media, information display, city lighting projects LED screen in the figure can be seen everywhere, with the exception of the United States outside of Las Vegas and a few other cities, China's LED display applications most widely used.
3. Urban road lighting
With the rapid increases in the efficiency of high-power LED (white LED current efficiency at 350 mA drive current, the luminous efficiency reached 114lm / W), LED lighting in China to promote more rapid pace than expected. Earlier this year, the U.S. leading manufacturer CREE LED Tianjin Economic Development Zone and Tianjin to join hands University of Technology, LED City in China's devaluation lighting, set off the first application of LED lighting craze; recently, halter Cairn Tunnel in Guangzhou have also been successfully used LED tunnel light, its power consumption between the 60W-120W, compared to traditional high pressure sodium lamps save 50% of the electricity. We believe that with further increase in LED light effects and related technology, perfect matching of light and heat, LED lighting in the city will be more widely applied.
4. The traditional lighting
Compared with traditional lighting, LED advantage is more obvious, compared to fluorescent lamps, LED lamps in general lighting applications, saving 20% -70%, and according to different applications and optical design, the power difference. Currently many large traditional lighting giant, China has begun to move the focus of LED lighting.
Made great breakthroughs in chip
Chip development a major breakthrough in China, particularly in the epitaxial wafers, epitaxial substrate through innovation have made great progress, but there is still a certain level with the international gap. Foreign external quantum efficiency blue chips has broken 50%, and with the drive to further reduce the voltage, the data will be overwritten. In contrast, the efficiency of the quality of our products there are still far below the gap, especially in high-power chips obvious. The author believes that to solve these problems, we need to work in the following areas:
The introduction of high-end professionals; to strengthen cooperation with international companies; bring in quality international manufacturers; to strengthen communication between the domestic chip manufacturers; the leading sector needs to lead the organization around the topic of high-end chip for the conferences, to promote LED chips development.
In addition, the domestic MOCVD (metal organic chemical vapor deposition) equipment does meet, indicating that domestic investment on the LED chips is increasing, which is gratifying. However, the development of LED chip technology equipment, not only by the increase and improvement of capacity to reflect, but also improve the quality of LED itself.
Importance of the LED package to be
Undeniably, China's packaging industry has undergone enormous changes in recent years, progress is obvious to all, especially to develop low-power LED, and many have introduced automated packaging equipment, production capacity and quality are a great leap . But we see these welcome changes, but also on the development process to be attention to some problems:
1. Packaged applications and more than special.
Impulsive can be said that China now the general mentality of LED packaging companies. Many enterprises in the package on a little after the turn, do the achievements applications, applications also want to do anything. Little ability to live lonely, and Specialization for LED packaging company. My main advantage of the current packages is reflected in prices, real quality with Japan in Asia and other international famous enterprises of enterprises to compete very little.
2. On the package, not a deep understanding of technology.
In fact, the gold content as much as chip packaging technology of production, China's packaging companies have to face many questions remain, including how to solve the LED heat, how to reduce the thermal resistance of LED, LED out how to increase efficiency, and how to increase the reliability of LED and how white LED production breakthrough in the patent barriers. These are the subject of further study.
3. Our comprehensive competitiveness to be increased.
As mentioned earlier, the competitiveness of our country is still reflected in the price, reliability, longevity is no obvious advantage, even if the same is imported chips, packaged products out quite different. White power has been available in foreign countries, mass production 114lm / W high-performance devices, the other hand, there is seldom effective maturity of high power devices.
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