prevents thermal deterioration of the LED

For collecting biological information such as the amount of oxygen in the blood, devices made by combining a light source and light-sensitive detector are widely used. Therefore, the research group expects that the new Led high bay light source will be used for medical and healthcare wearable devices that use light as a probe to collect a variety of biological information.The sheet-like OLED light source has a mass of 3g/㎡, which is as light as the sensor sheet announced July 25, 2013. With a thickness of 2μm, it can be flexibly bent. By establishing a technology to directly accumulate OLED elements on a 1.4μm-thick plastic film substrate, the group developed the light, soft OLED light source.This time, the research group made improvements to a technology for manufacturing OLED elements and constituent materials. To directly form OLED elements on a plastic film substrate, which tends to be damaged in the manufacturing process, the group eliminated ITO electrodes, which require a high-energy film-forming process using plasma. Instead, it used a conductive polymer that enables to form a film with a spin-coating process, which requires a low temperature and low energy, for positive electrodes.

The PEDOT: PSS has been used as a material for hole-injection layer. But the group found that it can also be used for the positive electrodes of the OLED elements of light sources.The group conducted the research in cooperation with a research team led by Siegfried Bauer and a team led by Niyaze Serdar Sariciftci. They are professors at Johannes Kepler University of Linz in Australia.The company intended to exclusively sell in Japan the LED bulbs, which was sold in the United States by venture business headquartered in Silicon Valley. The products adopted the same housing shape of incandescent bulb E26 (Edison screw base standards), with the high diffusion, dimmable options and liquid-cooled heat dissipation technology.However, this new business opportunity has presented a small challenge. The home gardened vegetables have a growth cycle of about 40 days, and after the first crops are harvested it takes awhile before the second batch can be cultivated, said Hirai. Despite the waiting period, Asahi still plans to commercialize LED farming next year, since vegetable gardening can become a highlight in interior decoration and spice up home owners’ life.

Canon MJ first listed through website three LED bulbs, which respectively are 60W retrofit, 80W retrofit, and 100W retrofit, the prices of them respectively are 8,480 yen, 10,480 yen, 11,480 yen and each with a 3 year warranty. Although compared to existing products with the same brightness, the LED bulbs from Canon MJ cost more and consume more power, but with dimmable function. The light diffusion of these bulbs are close to incandescent bulbs, so the hotels, shops and other places paying attention to light quality became the main target group. Seen from the hue when lighting on the object, its level of Ra value reach over 80. In addition, the products using Led high bay lighting base and others are being developed.The developer is SWITCH Lighting company headquartered in San Jose, California, United States. Products were produced in Thailand. The three products in sale used 10 or 12 LEDs. Inside the sealed transparent or white turbid glass housing, there is liquid silicone that can absorb the heat generated by the LED to promote heat dissipation. The liquid silicone through convection circulation to release heat to the glass housing and aluminum cooling fin on the lamp base. Due to the higher thermal conductivity of the liquid silicon than that of air, the cooling efficiency of these bulbs is much excelletn than existing products, which also prevents thermal deterioration of the LED, while achieves a high brightness and long life.

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