LED packaging: focus on raw materials look forward to innovative technology

The trend of energy saving and environmental protection has brought more LED demand, and the technology is mature, it promotes the popularization of LED products. Over the past 2 years, LED display, backlight, lighting market has grown rapidly, more companies to enter this field, and in expanding production capacity, while China has become one of the world's major countries in LED packaging manufacturing.

Packaging is critical to LED reliability

Packaging technology is closely related to LED reliability

LED street lamp has the advantages of energy saving, reliability needs to be further improved

Technically, the main factor driving the development of LED applications is to enhance the efficiency of the chip. Industry experts, general manager of Shenzhen Lehman photoelectric Polytron Technologies Inc Li Mantie told reporters that the recent LED chip in the continuous improvement of the effectiveness of the market, the bulk of the supply of 1W high-power products have reached more than 100lm/W.

Packaging technology is another important factor, although it is not obvious to improve the LED light effect, but it is closely related to the reliability of LED. In the micro electronic (Weifang) Co., Ltd. vice president of research Zhang Yanwei said that the difference of packaging technology has a direct impact on the quality of LED, good sealing and cooling technology can make the LED work in the junction temperature of 60 DEG C, life can be more than 50 thousand hours. The poor packaging technology will shorten the life of more than half LED. The luminous efficiency of LED light efficiency depends on the 90% chip, the excitation efficiency in package structure and fluorescent powder on LED 10%; 30% reliability depends on the chip, 70% depending on the packaging technology, packaging materials, packaging structure and management; 50% LED heat dissipation depends on the chip structure, 50% depends on the design and packaging material for cooling cooling structure selection. Li Mantie concluded.

In the industry wide attention in the field of LED lighting, packaging technology is particularly important. At present, the improvement of the light efficiency of the chip makes the efficiency of the whole lamp of the high efficiency LED street lamp reach more than 80lm/W, which has the advantages of energy saving, and the reliability and the service life of the utility model need to be further improved by the packaging technology. Li Mantie said that the current bottleneck of LED street lamp in light effect, and in the light of reliability and high power LED lamp, LED lamp light and package reliability plays a key role.

Anhui Zerun photoelectric Limited company president Chen Hesheng believes that, for the LED lamp, the packaging industry can do to enhance light efficiency in the work is limited, it is more dependent on chip technology progress; and to improve the stability, reliability and consistency is the key (more emphasis on process control), because LED the device used in street lamps is applied, regardless of any program needs to be applied to parallel technology, which leads to every street lamp with hundreds of devices, as long as there is a device that will have an impact on the current voltage threshold of the original design, and the whole lamp working condition influence LED, which claims 10 to 15 years of life become empty. Therefore, he believes that in this sense, high power LED device failure rate control must be very strict, which is the top priority of the packaging industry.

Study on key mechanism

Basic materials and cooling technology in the gradual improvement

Research on key mechanisms still need to be strengthened

In the past, factors restricting the development of LED packaging technology is believed to exist mainly in the following three aspects: one is the encapsulation of key raw materials, such as substrate material, organic rubber (silicone, epoxy resin) and fluorescent powder performance needs to be improved; two is a high power LED packaging technology radiation problem is not completely solved; three package structure for different applications should be innovative. At present, the domestic LED packaging industry has made significant progress in these areas? "The basic materials and cooling technology in gradually improved, but the increase is not obvious, the LED package of the product price increase is more dependent on the main raw material -- LED chip price increase; innovative package structure for application on is not very obvious, more performance for some improvements to meet the application needs in do the process, packaging and application has not reached the full integration of the realm. Chen Hesheng said. Therefore, he believes that since 2009, the domestic LED industry in packaging technology, the main indicators of progress, more performance as a quantitative nature of progress, has not yet formed a qualitative breakthrough.

Li said with the use of iron man, improvement of the packaging structure design and a large number of new thermal materials, LED package level control and enhance the reliability of light has reached a new level. But he believes that the domestic enterprises for LED packaging technology is not enough to grasp the key mechanisms and the lack of independent intellectual property rights. In his view, the domestic LED packaging industry needs to increase the importance of key packaging materials, including high-performance epoxy resin, high-performance silicone, new heat dissipation materials, new fluorescent materials, new stents, etc.. He told reporters that the Lehman photoelectric was established at the China University of Geosciences Lehman photoelectric materials research and development center, the key mechanism and the field of materials chemistry, group to study packaging materials and technology, and accumulated a series of patented technology.

At present, the LED application market is growing rapidly, packaging enterprises to meet market demand, but also to expand production capacity. But in this market development opportunities, enterprises can only strengthen the key technology research and investment, and make more breakthroughs in order to obtain sustainable development momentum.