Manufacturing high-power vertical LEDs with DLC interface and drilled copper substrate [photo]
In 2010, global LED production value (about tens of billions of US dollars) almost approached TSMC's sales for one year. Many heavyweight companies (such as TSMC, Hon Hai, AUO, etc.) will also jump into this sea of ​​light. However, the mainland has long had a layout to make 2012 the traditional Armageddon year of the traditional LED, and the final winner will be China. China not only masters the market, but also lays out nearly a thousand MOCVD machine seas, so it can seize the upper, middle and lower reaches of LED industry. In view of this, the leaders of LED epitaxial production such as CREE, Jingdian, Canyuan, New Century, Xuming Optoelectronics have entered the mainland. The survival of LED epitaxial companies in the United States, Japan, and Taiwan is to upgrade the traditional horizontal LED design to a vertical LED, so that it can increase the current (such as a single chip 10W) ​​on a large area chip and produce one LED. Cost replaces many traditional LEDs.
Vertical LEDs must be fabricated by soldering GaN semiconductors on low-expansion substrates, but low-expansion materials (such as germanium or GuW) have poor heat dissipation, while high thermal conductivity materials have much higher thermal expansion than GaN (about 5.5). Ppm/mK), so LED experts can't find the ideal bonding material. This article recommends the use of DLC as the interface for diamond and copper composites (diamond heat sinks) to make the world's most advanced vertical LEDs. This will allow Taiwan's LED industry to leapfrog ahead of foreign leading companies (such as Nichia, Osram, Lumiled), and also take advantage of the European, American and Japanese patent blockade against Taiwan.
LED world revolution
In 2010, LEDs began to be used extensively for indoor lighting , outdoor street lighting, and TV backlighting. Incandescent Lamps and Fluorescent Lamps commonly used in indoor lighting are the Cold Cathode Fluorescent Lamps commonly used in LCD backlights.
The mainstream product of LED is white light illumination, and most of the white light is a yellow light that is excited by a blue LED to generate false white light. The bulk production of LEDs is a chip that epitaxially epitaxially grows GaN into LEDs using sapphire as a substrate. The main method of growth is Metal Organic Chemical Vapor Deposition (MOCVD). Taiwan has the largest number of MOCVD equipment, making it the world's number one LED grain producer. However, the mainland has already rushed to catch up, and even offered a subsidy of RMB 10 million per MOCVD subsidy.
Taiwan's major production companies (Crystal, Canyuan, Xinshiji, etc.) have set up factories in the mainland. On the other hand, South Korea (such as Samsung), the rival of Taiwan's optoelectronic products, purchased a large number of LEDs from Taiwan in 2010, but it also installed more than 200 MOCVDs. Therefore, the production capacity of LEDs produced by MOCVD in Taiwan may be excessive in 2011, and it is expected to become an unprofitable Red Sea market. Taiwan urgently needs to develop higher-end products to avoid the revival of DRAM price competition after the financial turmoil (see Table 1 to Table 4).
Table 1: LED products company with the world's largest output value (2009)
Table 2: LED companies with the world's largest chip production (2010)
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