In the next three years, China's LED lighting industry will enter a period of rapid growth. According to the "Twelfth Five-Year Special Plan for the Development of Semiconductor Lighting Technology" released by the Ministry of Science and Technology in August this year, by 2015, the scale of China's semiconductor lighting industry will reach 500 billion yuan, and the cost of LED lighting products will be reduced to 1/2011 5. The market share of general lighting should reach 30%. The local government's support for the LED lighting industry continues to increase.
However, the LED industry is currently facing a crisis of a vicious cycle of severe overcapacity, homogeneous competition, and low-price competition, and the LED industry chain is in urgent need of development. Therefore, the development of new, stylish, high-quality LED lighting fixtures will be a major topic for future research, with higher added value and output value, and we must pay attention to it from now on.
LED industry development is divided into two stages
The first stage of LED development has lower luminous efficiency, and the second stage of product efficiency continues to increase.
In 1962, Holonyak, who worked for General Electric in the United States, invented the gallium arsenide phosphoride light-emitting diode and predicted: "The future lamp can be a pencil-sized alloy that is practical and not fragile, and will never burn down. The conversion efficiency of the light bulb is at least 10 times greater. "In 1968, Monsanto Company of the United States launched commercial LED products. For 30 years, the LED luminous efficiency has increased by 10 times every 10 years. By the end of the last century, it had increased by a total of 1,000 times. Haitz et al. Put forward "another semiconductor revolution" in October 1999, which opened the prelude to the semiconductor lighting revolution.
Holonyak published an article titled "Is Light-Emitting Diodes the Final Form of Lamps?" In the 2000 American Society of Physics JPS, and concluded that "in principle, light-emitting diodes are the final form of lamps, and so is it. It will be developed until all powers and colors are realized. It is extremely important to understand this. " So far, high-brightness LEDs of various colors have been produced, and the luminous efficiency of white-light power LEDs has increased by 10 times by 2010.
The development of the LED industry is divided into two stages. The first stage is from 1968 to 1999, which is the growth stage of the LED industry. The product is characterized by relatively low luminous efficiency, which is mainly used in signals and displays. The second stage is from 2000 to 2020, which is the stage of improving the development of the LED industry. Product efficiency continues to increase, from 15lm / W equivalent to incandescent lamps to 258lm / W, exceeding all existing electric light sources. Its scope of application extends to the field of lighting until it becomes the protagonist of this field. Due to the leading technology development and the gradual expansion of the market scale, the total scale of the LED industry has increased tenfold or even one hundredfold.
Adjustment to the semiconductor lighting industry chain
Under the new situation, the LED industry chain must be adjusted to the semiconductor lighting industry chain.
In the first stage of the development of the LED industry, the structure of the industrial chain is relatively simple, which is what we usually call the LED upstream, midstream, and downstream industries.
The LED upstream industry chain mainly refers to the LED material epitaxy and chip manufacturing. Usually we call these enterprises chip factories; the LED midstream industry chain refers to the LED device packaging industry and the enterprises are called packaging factories; the LED downstream industry chain refers to the LED display or The industry of signal application products mainly refers to LED display screens, LED signal lights, LED car lights, and LCD backlights.
In the second stage of the development of the LED industry, LED luminous efficiency continues to increase substantially. In addition to the further development of the original signal and display fields, the application aspect is to gradually expand into the lighting field. By 2012, the efficiency of LED devices reached 130lm / W, which can not only replace incandescent lamps, halogen lamps, but also fluorescent lamps (including compact fluorescent lamps). The industry scale has grown significantly, especially the lighting application market has started. A typical example is that Japan sold 20 million LED bulbs in 2010, and 35 million in 2011. The European spotlight and PAR lamp market starts, North America downlights and bulb lights start, and China LED street lights start. People call 2010 the first year of LED lighting. LED lighting applications will develop rapidly. Under the new situation, the LED industry chain will have to be adjusted to the semiconductor lighting industry chain.
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