The blue LED chip used in the white LED and the blue-violet semiconductor laser used in the blue light source are expected to greatly improve the performance of these GaN-based semiconductor light-emitting elements. In this field, Sumitomo Electric Industries, the largest manufacturer in Japan, recently realized the enlargement of new GaN substrates and is about to launch products. This product is a GaN substrate with a diameter of 2 inches using a "semi-polar surface" and a "non-polar surface" of GaN crystal. Among them, the substrate with non-polar surface is scheduled to be supplied in 2010.
This substrate product achieved the same level of 105 cm-2 dislocation density as the GaN substrate product used to fabricate the blue-violet semiconductor laser, while expanding the aperture to the same 2 inches as the existing GaN substrate product. The semi-/non-polar GaN substrates previously provided in the industry are small and narrow rectangular products.
A GaN-based semiconductor light-emitting device generally utilizes a crystal face called a "polar face" in GaN crystal. If a semi-/non-polar surface different from the crystal plane is used, the influence of the "piezoelectric field" generated in the GaN crystal can be weakened, and the luminous efficiency of the light-emitting element can be improved and the wavelength can be lengthened (Fig. 1). For example, by using a non-polar surface, it is expected to increase the luminous efficiency by more than 20%. In addition, since the wavelength is easily extended, a pure green semiconductor laser can also be realized.
Although Sumitomo Electric Industries did not disclose the details of the implementation technology, it is said to achieve a 2-inch substrate diameter by using the self-developed HVPE method. The HVPE method itself is a technology used by existing GaN substrate products. Therefore, it is possible to make full use of existing manufacturing equipment. That is to say, it is expected to achieve the same price as the existing GaN substrate products.
6-inch products will also be unveiled
However, the price of GaN substrates is higher than that of Si substrates and sapphire substrates, and the aperture is much smaller, so they are mainly used in the field of lasers. Sumitomo Electric Industries intends to overcome this problem and promote the adoption of GaN substrates in LEDs and power semiconductors.
Therefore, Sumitomo Electric Industries is working on further enlargement of GaN substrates. Unlike the semi-/non-polar surface described above, the same polar surface as the existing GaN substrate is used, and the successfully developed large-sized substrate realizes a 6-inch aperture. With the appearance of large-size products that help increase production efficiency, the cost per unit component of blue LED chips, semiconductor lasers, and power semiconductors using GaN substrates is expected to be reduced.
What is Industrial DTU? Industrial DTU characteristics and application field analysis
What is DTU?
A Data Transfer unit (DTU) is a wireless terminal device that converts serial port data into IP data or IP data into serial port data over a wireless communication network.
Second, industrial DTU characteristics?
D220 is an industrial 4G DTU based on 4G wireless network, the product uses high-performance industrial embedded processor, real-time operating system as the software support platform, to ensure that the data link is smooth at any time, to provide users with high-speed, stable and reliable data transmission. It can be easily and quickly arranged in the industrial site, and can be used in harsh environments.
Hardware features:
Anti-interference design, suitable for harsh electromagnetic environment application requirements
Wide voltage power supply design, support DC5V-35V power input, built-in power reverse protection and overvoltage and overcurrent protection
The serial port can be a service serial port or a data serial port
Supports the many-to-many link configuration between the service serial port and the center
Select industrial-grade devices and optimize electromagnetic compatibility design to meet the requirements of harsh application environments
The D220 supports backward compatible 2G/3G network access based on 4G network.
Built-in hardware watchdog, regular detection mechanism, automatic resetting of abnormal equipment.
Complete industrial environment design requirements, all-metal structure, the whole machine has passed the strict electromagnetic compatibility test, CE certification
Software features:
Multi-center mode/Multi-backup mode (up to five multi-centers/backup centers)
Different serial ports can be used as maintenance or service serial ports, and different service serial ports can be connected to different multi-centers.
Multi-protocol upper development kit support (compatible with communication protocols of multiple DTU manufacturers, which can achieve seamless replacement of DTU)
Supports ICMP and LCP link detection technologies and keeps heartbeat alive, ensuring the stability and reliability of the network and communication
Supports local serial port upgrade and remote software upgrade
Supports TCP, UDP, DUTCP, DCUDP and other connection protocols
Supports multiple encryption modes to ensure secure data transmission
3. Application fields
D220 4G DTU conforms to industrial design, complete functions, stable transmission, widely used in environmental protection, water conservancy, meteorological industries; Industrial control field; Industry and special environment, oil and gas, heating industry, etc.
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