Sapphire substrates are common. Almost all white chips produced in China, Japan, China, Taiwan Province Province of China and Europe are sapphire substrates. The main advantage is mature technology.
Silicon substrate is rare, its main advantage is that it can conduct electricity horizontally and vertically, but the technology is not mature enough. This silicon-based LED chip is produced in the United States and Jiangxi, China, and the chip cutting size is not large.
Silicon carbide substrate is a patented process of CREE company in the United States. Silicon carbide has the best thermal conductivity, and the chip can be soldered to the substrate as soon as the electrode is up and down. Therefore, it is the substantive process with the best thermal conductivity at present, and 20 10 has been mass-produced.
The light efficiency of the new product can reach 200 lumens per watt. The disadvantage is high cost.
White LED phosphor
White LED chips actually emit blue light, and white light is synthesized by mixing yellow phosphors. The yellow phosphor is light yellow and made of Y6. Al 10。 O 12, also known as YAG phosphor. It is a non-toxic and non-radioactive inorganic substance. Japan's Riya Chemical has a patent right, so we should pay attention to obtaining sub-authorization for export products.