Nakamura Shuji borrowed the triangle purple LED won the Japanese market

University of California-Santa Barbara (UCSB) Professor Nakamura Shuji as co-founder (co-founder) set up LED venture company - the United States began to explore the Japanese market Soraa. At present, LED has started selling Soraa lamps on the market in Japan by oxtail light. In addition, it is scheduled to open in the spring of 2015, the Japanese office. Soraa plans to rely on the characteristics of LED lights, as well as in the village after the Nobel prize to enhance the popularity of large-scale expansion of sales in the Japanese market.

Nakamura will deliver a speech on Soraa's office in Japan

Soraa consists of three professors, including the village, including the creation of UCSB. From 2012 to start selling LED lights, after about 2 and a half years, and now sales of about 4 billion yen. 2013 to 2014 sales grew by about 2 times. Currently has about 300 employees.

The secret of Soraa's rapid growth lies in the company's LED lights. The company's LED lamp is characterized by "high color rendering index, can be issued to the natural light of the beautiful white light" (Soraa). The company's white LED is a combination of red, blue and green fluorescent materials on a purple LED chip. Thus, all the light in the visible wavelength range can be output, so the color rendering index is relatively high. The company stressed that the red color index R9 is particularly high. The average color rendering index "Ra" is as high as 95. Ra is the average from "R1" to "R8".

Soraa LED lamp

Common white LED is made of yellow fluorescent material on a blue LED chip. Therefore, the wavelength of light is not balanced, so it is difficult to improve Ra.

In addition, Soraa said the company's LED lamp also has the following characteristics, that is, the light emitted from the LED light (beam) is more uniform, free to change the shape of the beam. In order to change the shape of the beam, an optical element named "SNAP" is installed in the light of the lamp. In order to facilitate disassembly of the SNAP, a magnet is disposed in the disassembly section. SNAP not only can change the shape of the beam, but also change the color temperature.

The luminous efficiency is increased by an average of 30%

Soraa also highlights the characteristics of the company's products to improve luminous efficiency faster. The luminous efficiency of white LED light of the company's development is in a way though, but at an average annual rate of about 30% increase, Soraa said confidently, "ordinary white LED lamp, the growth rate of more than the blue chip LED". For example, Ra is 95, the color temperature is 3000K, the luminous efficiency is about 50 ~ 60lm/W. 2015 is expected to maintain the growth rate of about 30%, is estimated to reach 70 ~ 80lm/W.

Top view of Soraa's LED lamp. The central magnet is used to install SNAP

Purple LED not only high luminous efficiency, but also improve the efficiency of fast, because purple LED is manufactured using GaN substrate. On the LED substrate, the GaN semiconductor chips are stacked on the GaN substrate, so the crystalline quality of the GaN semiconductor layer is relatively high. Also known as the "GaN on GaN" LED.

Ordinary blue LED chip is made on sapphire substrate. Due to the difference in the lattice constants of GaN semiconductor and sapphire, it is easy to appear the crystal defect. However, there is little difference in lattice constant with GaN substrate, so it is difficult to find the crystal defect. Compared with sapphire substrate, the dislocation density can be reduced to about 1/1000.

Soraa LED light up view. Heat sink with a unique shape

Triangle LED chip

LED chip shape is also very unique. The ordinary LED chip shape of four corners (four columns), and the Soraa chip as the triangle (triangular). As a result, the efficiency of the light emitted from the light-emitting layer of the LED chip to the outside of the chip is improved to about 90%. The reason why the triangle shape can be made because of the high crystalline quality. The company said, if the crystallization quality is relatively low, then the corner of the triangle will be damaged, or not fully luminous". That is to say, the GaN substrate is used to improve the quality of the crystal.

Soraa said that the high color rendering index, beautiful white light, uniform brightness, high beam shape freedom and so on have been well received by lighting designers, hotels, restaurants, retail stores, etc.. In Japan, such as the adoption of the hotel.

Soraa also intends to expand the product line. In addition to the previous LED lights, but also scheduled from February 2015 to start lighting appliance manufacturers with heat sink module sales.

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