Analysis on the Market Structure and Development of High Brightness LED Chips

White light application is an important market for blue LED chips , and it is also the most important development direction. It uses a blue chip and YAG yellow phosphor to form a white light source. At present, international LED manufacturers have obvious advantages in high-power blue-chip chips, while domestic LED chip companies are mainly developing in small and medium-power blue-light chips, but over-investment in previous years has caused overcapacity. This has led to a more serious "price war" in the small and medium power blue chip market. For the blue LED chip, the main development direction is silicon-based LED chip, high-voltage LED chip, flip-chip LED chip and so on. For the small and medium power LED chip market, the current mainstream market trend is 0.2-0.5W market, and the package form includes 2835, 5630 and COB package. For other subdivisions, such as vertical structure chips, they can be applied to directional lighting applications such as flashlights, miner's lamps, flashlights, spotlights, etc.

Silicon substrate LED chips are getting more and more attention

At present, the mainstream blue chip on the market is generally grown on a sapphire substrate, which is represented by Japan Nichia Corporation; in addition, a blue chip is grown on a silicon carbide substrate, represented by American Cree.

In recent years, blue LED chips grown on silicon substrates have received increasing attention. Since the silicon substrate can be used in the automatic production line of the IC factory, it is relatively easy to adopt the mature process of the current 6-inch and 8-inch lines of the IC factory, and the cost of the large-sized silicon substrate is relatively low, so the cost of the silicon substrate LED chip in the future. Expected to decline significantly, but also promote the rapid penetration of semiconductor lighting. Silicon-based LED chips have the following characteristics in their characteristics:

● Vertical structure, using silver mirror mirror, can make the current distribution more uniform, thus achieving high current drive;

● The silicon substrate has good heat dissipation, which is beneficial to the heat dissipation of the chip;

● It has Lambertian light-emitting appearance, uniform light emission and easy secondary optics;

● Suitable for ceramic substrate packaging;

● Suitable for LED flash and directional lighting applications for indoor, outdoor and portable lighting markets.

In the development of silicon-based LED chips, Crystal Energy has introduced low-power silicon-based LED chips in 2009, which is widely used in digital display. In June 2012, Jingneng Optoelectronics released a new generation of high-power silicon-based LED chip products in Guangzhou, which attracted great attention from the LED industry at home and abroad. Four silicon-based large-scale products including 28mil, 35mil, 45mil and 55mil were introduced. Power LED chips, of which 45mil chip achieves 120lm/w light efficiency, and reached 130 lm/w at the end of the year with good reliability. After the silicon-based LED chip ceramic package, compared with internationally renowned products, it has a good cost performance, which has aroused great interest from domestic and foreign packaging factories and LED lighting factories. According to reports, Sharp and Puri also announced the mass production of silicon-based white-light chips at the end of 2012, and introduced two white-light chips. In addition, major manufacturers including Samsung, Osram, and Jingdian are also actively engaged in silicon-based LED chips. Research.

The LED market is in the stage of rapid development, and the further decline in the cost of LED chips will promote semiconductor lighting into the family. Due to the low cost of the silicon substrate and the mature manufacturing process of the IC factory, with the continuous development of 6-12 inch large-size silicon-based LED technology, silicon-based LED technology will have great advantages in reducing cost and improving production efficiency. This will have a major impact on the LED industry.