Dow Chemical: Silicon-based GaN is difficult to move the mainstream position of sapphire substrates

Recently, Dow Chemical said that at this stage, the yield of GaN-on-Si is still low, and the cost and performance are still difficult to keep pace with the sapphire substrate. Therefore, the annual growth rate of the sapphire substrate can still be Maintaining 20%, it is estimated that the mainstream market position of sapphire substrates is still difficult to move within three years. But in the long run, silicon-based gallium nitride and sapphire substrates will be in the LED lighting market.

At present, TSMC, OSRAM Opto Semiconductors, Bridgelux and other large companies have launched 矽-based GaN LED deployment. Among them, Puri has announced that it will jointly develop Toshiba (Toshiba) to jointly develop 8-inch silicon-based GaN LEDs, which is scheduled to be introduced into mass production in early 2013.

Dow Chemical believes that in the past, due to the high price of sapphire substrates, the industry hopes that the cost of LEDs will be significantly reduced after the advent of silicon-based gallium nitride substrates, thus stimulating the penetration of LED lighting market. However, observing the progress of research and development of manufacturers that have invested in bismuth-based GaN, it is obvious that the current yield is still quite low, and thus it has become a research and development focus of relevant industry.

Floating Ball Level Controller

The floating ball liquid level controller is composed of floating ball, plug rod, etc. It is installed on the top of the container through the connecting flange, and the floating ball floats on the liquid level according to the principle of equal volume of liquid. When the liquid level of the container changes, the floating ball also moves up and down. Due to the magnetic effect, the dry spring of the floating ball liquid level controller is magnetically attracted to change the liquid level position into an electrical signal, and the actual position of the liquid is digitally displayed through the display instrument, Floating ball liquid level controller to achieve remote detection and control of liquid level.
The floating ball liquid level controller is designed according to Archimedes' buoyancy principle. When the liquid level of the container changes, the floating ball also moves up and down. Due to the magnetic effect, the dry reed of the floating ball liquid level controller is magnetically attracted, so that the resistance in the sensor changes linearly, and then the converter converts the change of the resistance value into 4mA ~ 20mA standard DC signal output, Realize the remote detection and control of liquid level.

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