The trend of energy saving and environmental protection has brought more LED demand, and the continuous maturity of technology has promoted the popularization of LED products . In the past two years, the market for LED display , backlight and lighting has grown rapidly. More companies have entered this field and are expanding their production capacity. China has become one of the major LED packaging manufacturers in the world.
Packaging is critical to LED reliability
Packaging technology is closely related to LED reliability
LED street lights have energy saving advantages and reliability needs to be further improved
Technically, the main factor driving the development of LED applications is the improvement of chip light efficiency. Li Mantel, an industry expert and general manager of Shenzhen Lehman Optoelectronics Technology Co., Ltd., said that the light efficiency of LED chips has been continuously improved recently, and the 1W high-power products supplied by the market have reached more than 100lm/W.
Packaging technology is another important factor, although it is not obvious for improving LED light efficiency, but it is closely related to the reliability of LED. Zhang Yanwei, vice president of research and development at China Micro-Optical Electronics (Weifang) Co., Ltd. said that the difference in packaging technology directly affects the quality of LEDs. Good packaging and heat dissipation technology can make LEDs work below 60 °C junction temperature and have a lifetime of more than 50,000 hours.
The poor packaging technology will shorten the LED life by more than half. "90% of LED efficacy depends on the luminous efficiency of the chip, 10% depends on the package structure and the excitation efficiency of the phosphor; LED reliability is 30% depends on the chip, 70% depends on the packaging process, packaging material, package structure and package management LED heat dissipation is 50% depending on the chip structure, 50% depends on the package heat dissipation structure design and heat sink material selection." Li Mantie concluded.
In the field of LED lighting, which is widely concerned in the industry, advances in packaging technology are particularly important. At present, the improvement of chip light efficiency makes the efficiency of some high-efficiency LED street lamps reach 80 lm/W or more, which has the advantage of energy saving, and its reliability and service life need to rely on packaging technology to further improve.
Li Mantie said that the current bottleneck of LED street lights is not light efficiency, but in the light decay and reliability, the package of high-power LEDs for street lamps plays a key role in the light decay and reliability of LED street lamps.
Chen Hesheng, president of Anhui Zerun Optoelectronics Co., Ltd., believes that for LED street lamps, the packaging industry can do limited work in improving light efficiency. It is more dependent on the advancement of chip technology; it is improving stability and reliability. Sexuality, consistency, etc. are very important (more on process control), because LED devices are used in street lighting applications, and any solution needs to be applied to series-parallel technology, which leads to hundreds of street lamps. In the device, as long as one device has a problem, it will affect the current and voltage thresholds in the original design, which will affect the working state of the whole lamp, making the LED's claimed 10- to 15-year service life become empty talk. Therefore, he believes that in this sense, the control of the failure rate of high-power LED devices must be very strict, which is the top priority of the packaging industry.
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