Strategic thinking on LED R & D and industrial development strategy in China

In recent years, the rapid development of China's LED industry, at this stage the number of people engaged in the industry up to hundreds of thousands, nearly 100 research institutions, thousands of enterprises. From the competitive landscape of the global LED industry, the automation level of domestic LED packaging enterprises to upgrade faster, lighting industry in road lighting mainly made a breakthrough development, LED packaging and application in terms of scale and industrialization of technology has an important influence in the world; on the other hand, the domestic LED epitaxy and chip production capacity and technology enterprises the level of a certain upgrade, the upstream industry maintained a good momentum of development, but generally speaking, the global competitiveness is relatively weak. In this context, the Ministry of science and technology in a timely manner to start the Ten City million program, greatly promoted the domestic government, industry, academia, passion for the development of semiconductor lighting industry. On this occasion, we will in recent years on the basis of research on the formation of the LED research and development and industrial development ideas for the industry colleagues reference.

Characteristics of future industrial development: technology and market growth

Luminousfluxoutput actual lighting is usually in the thousands to tens of thousands of lumens lumens, and the luminous flux of single high power white LED in only 100 lumens, so semiconductor lighting usually consists of dozens of hundreds of clusters of white LED. The performance of LED in terms of the use of low pressure, constant current drive due to the dissipation of cluster LED semiconductor lighting must solve the great heat and from AC power to low-voltage constant current switching power supply management problems caused by. In addition, the traditional packaging power LED small luminous flux, high brightness light-emitting characteristics will cause very serious glare. Therefore, the semiconductor lighting technology is not limited to the production and packaging of the chip, but a system design, including optical design, heat and power management, including the system level.

From the LED epitaxial wafer to the final lighting fixture, it needs a series of industrial chain links, such as material epitaxy, chip manufacturing, core packaging, lamp design and assembly. On the one hand, from the wafer to the final lighting and display applications, all aspects of the industry chain to form independent products, and has its own technical barriers and research needs; on the other hand, affecting the quality of terminal application products will be each link. For example, the core component of semiconductor lighting is LED chip, but the luminescence efficiency of LED chip to 100lm/W, is not equal to the efficiency of semiconductor lighting has reached 100lm/W; more importantly, semiconductor lighting products to gain market recognition, comprehensive performance including efficiency, reliability, light of human comfort, compared with the traditional lighting the product must have obvious advantages. In other words, even if the semiconductor lighting efficiency reached 100lm/W, it doesn't mean that it must be accepted by the market, semiconductor lighting itself there are many scientific problems need to be studied, such as lighting effects and quality including color, color consistency, human comfort etc..

Only when the development of technology makes the semiconductor lighting in the efficiency, lighting quality, design and other aspects of the advantages of the traditional light source, semiconductor lighting can enter and continue to open up the market. On the other hand, the expansion of the market will lead to the expansion of production and investment in research and development of the industry to accelerate technological progress, so as to enhance performance and cost and price gradually declined. The above two processes alternate, eventually led to the rapid development of semiconductor lighting industry.

Two, the future market focus areas: semiconductor lighting and LED display

Semiconductor lighting industry mainly includes the outdoor general lighting, indoor lighting and so on, in general, downstream industries; LED display industry including LED backlight and LED display area of the middle and lower reaches of the industry. On the technical level, the upper, middle and lower reaches of the industrial technology is the material epitaxy and chip fabrication, packaging, modules and lighting manufacturing technology. Semiconductor lighting and LED display products in the upper and middle reaches of the industrial technology is basically the same, the main difference lies in the downstream technology.

1, the future of semiconductor lighting market will be the largest part of the general lighting

General lighting includes two categories: indoor lighting and outdoor lighting. These two types of applications require a lamp with high luminous efficiency, long life, environmental protection and other characteristics, the main difference is that the interior lighting of the lighting effect and quality (including color, color consistency, light exitance and uniformity, human comfort etc.) requires higher, and the oriented consumer groups are more sensitive to the price of lamps and lanterns. On the other hand, the blue chip luminous efficiency advantages to further improve the packaging technology is limited by the white LED, semiconductor lighting at present are mostly white and cold high color temperature, chromaticity consistency compared with the traditional lighting is not satisfactory, the semiconductor lighting in the outdoor lighting in large scale applications, and in the interior lighting has just started. Therefore, due to the cost and quality of lighting, semiconductor lighting will take the lead in the large-scale application of outdoor lighting, followed by the continuous development of technology into the field of indoor lighting.

A typical application of outdoor lighting is street lamp, street lamp is an important part of urban lighting, its power consumption accounts for a large part of the entire lighting power. The traditional street lamp uses the high pressure sodium lamp, high pressure sodium lamp with high luminous efficiency and color rendering index is very low, so that the irradiated object color distortion is very obvious; high color color high-pressure sodium lamp has improved, but its luminous efficiency,