Types of led chips and advantages and disadvantages

LED chips are mainly sapphire substrate, silicon substrate and silicon carbide substrate three kinds

Sapphire substrate: the market share ranked first, is originated from the Japanese company's patented technology. The main advantages are: good chemical stability, does not absorb visible light, affordable, relatively mature manufacturing technology; shortcomings: poor electrical conductivity through the same side of the P, N electrodes to overcome; not easy to mechanically cut by the laser scribing technology to overcome. However, poor thermal conductivity in the small current work did not reveal significant shortcomings in the power device under high-current work problem is very prominent

Silicon substrate: substrate is a patented technology originated in China. Advantages: high crystal quality, large size, low cost, easy to process, electrical conductivity, thermal conductivity and thermal stability is good, disadvantages: silicon substrate on the absorption of light is serious, resulting in silicon substrate LED light efficiency is low

Silicon carbide substrate: the second market share. Silicon carbide has the advantages of good chemical stability, good electrical conductivity, good thermal conductivity, does not absorb visible light, etc.; drawbacks for the high price, crystal quality is difficult to reach the sapphire and silicon so good, mechanical processing performance is relatively poor, SiC substrate absorbs 380nm below the ultraviolet light, is not suitable for the research and development of 380nm below the ultraviolet LED.

Silicon carbide substrate: market share second.