In recent years, China's LED lighting industry has shown explosive growth. According to the statistics of the High-tech LED Industry Research Institute, the total output value of China's LED industry will reach 344.5 billion yuan this year, up 31% year-on-year, of which the downstream application value is 275.7 billion yuan, up 32% year-on-year. With the popularity of LED lighting in the domestic market, the aluminum-based copper clad laminate industry, which constitutes one of the core components of LED lamps, is also emerging.
Since the birth of LED, the problem of heat dissipation has always been a big problem for manufacturers. If the junction temperature of the LED exceeds 85 degrees, it will lead to chip failure, phosphor oxidation, and light decay. The heat dissipation performance directly affects the life of the LED lamp. The aluminum substrate has the characteristics of high thermal conductivity, low thermal resistance, withstand voltage, light weight and anti-oxidation. The advent of the LED aluminum substrate brings a new solution to the heat dissipation problem of the product.
The aluminum substrate is composed of a circuit layer (copper foil), a thermal conductive insulating layer and a metal base layer. The working principle is that the surface of the power device is mounted on the circuit layer, and the heat generated during the operation of the device is quickly transmitted to the metal base layer through the insulating layer. The heat is then transferred from the metal substrate to dissipate heat from the device. Aluminum substrates are widely used in the LED industry, including LED street lamps, spotlights, wall lamps, buried lamps, and LED fluorescent lamps. In 1969, Sanyo Corporation of Japan first invented the aluminum substrate manufacturing technology. In 1974, it began to be applied to the STK series of power amplifier hybrid integrated circuits. The research and development of aluminum-based copper clad laminates in China began in 1988. The state-owned 704 factory completed the factory-level design of general-purpose aluminum substrates in 1990, and established the first aluminum-based copper clad laminate production line in China and put into production. At present, The Bergquist in the United States, NSK, Electrochemical Industry Co., Ltd. (DENKA), Nitto Denko Corporation (NITTODENKO), Sumitomo Electric Industries Co., Ltd. (SUMITOMOELECTRIC), etc. The company represents the advanced level of today's aluminum substrate technology.
The quality of the aluminum substrate directly affects the quality of the finished LED luminaire. Due to the low barriers to entry, the lack of core technology, and the imperfect industry standards, the current domestic aluminum substrate market has experienced mixed product quality and mixed fish. There is no specific measurement specification for the thermal conductivity of aluminum substrates. The thermal conductivity of aluminum-based copper clad laminates produced by different manufacturers is quite different. The quality of products produced by some aluminum substrate companies is difficult to guarantee, and the measured data of thermal conductivity does not match the nominal data. At present, there is a certain gap between the technical level of domestic aluminum substrates and the international market. The lack of support from core technologies, the products are generally low-end homogenization, and the products with low price and low quality occupy the market, and there are only a few high-end products. Enterprises have formed vicious competition in the price war, and the price pressure has led to a meager profit in the whole industry.
As the mainstream product of heat-dissipating substrates, the government and related departments of the government need to pay more attention to the aluminum substrate industry and strengthen the formulation of industry standards, testing and certification systems. Enterprises should base themselves on the long-term lighting market, establish brand awareness, and align with the advanced level of the industry in product technology. Low quality and low price can only be used for a short period of time. Improving the technical level and product grade is the best way for enterprises to survive.
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