the hue produced from blue and green LEDs

As for Lextar, Chairman F.J. Su pointed out that power shortage has compelled Japanese to replace traditional lamps with LED lamps. The company has won contracts from a heavyweight Japanese buyer after landing a contract for up to 400,000 LED light tubes from Japan. What’s more, prosperous orders from Japan has inundated the company’s production line until the end of June.Recently, researchers from Japan and California have jointly made a breakthrough on blue and green LEDs to reduce efficiency droop.According to the research team, they designed low droop and high efficacy Led high bay light by altering the direction of the crystal structure within semiconductor films. Droop refers to significant drop in efficiency at extreme currents. It is one of the major factors that retard the growth of the solid-state lighting market.

Household bulbs generate white light due to the mix of wavelengths with the hue produced from blue and green LEDs. These valuable colors are the ‘droopiest’ of the LEDs and are difficult to design. LEDs have increased energy-efficiency compared to the heat-generating incandescent bulbs. However, the LEDs lose a major part of this efficiency at high current lighting due to the droop feature. Although the droop-causing factor has not been clearly resolved, the research team at UC Santa Barbara has devised an innovative technique to reduce droop by revolutionizing the production method of LEDs.LED chips are created from layers of doped semiconductors packed together. By applying voltage through these layers, migration of electrons and holes takes place, which is directed toward an active layer area of LED, resulting in a photon. The commercially available blue LEDs, the c-plane accommodate the crystals that bind the semiconductor layers. Based on this standard orientation of the crystals, electrical fields that intervene during integration of the electrons and holes can be created.

The research team from UCSB designed LEDs that consist of tilted and non-traditional crystal orientations that reduce the field’s effect, showing minimal droop. Based on this approach, compact and low-cost led flood light chips were developed by the researchers.Recently, NGK Insulators Ltd has made a breakthrough on LED Luminous Efficiency with a gallium nitride wafer. The company claims that the new GaN wafer can realize twice as high a luminous efficiency as existing LED light sources.According to the company, it realized a transparent and colorless wafer with a low defect density by using its own liquid phase growth method for a single-crystal growth process.Based on the breakthrough, the company intends to launch the "Wafer Project" in fiscal 2012, aiming to commercialize its wafer-related products at an early date. It intends to start to ship samples of its world's first 4-inch diameter GaN wafer made by using a liquid phase growth method within 2012.The lamps in both series can provide bright light in entryways, stairways, lobbies, and reception areas. Because of higher lumen outputs, these can be set higher in a room without sacrificing light quality, or they can be placed farther away from the wall for track lighting.

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