Showa Denko KK (SDK) has introduced aluminum-gallium-indium-phosphide (AlGaInP) LED chips that emit red light with a wavelength of 660nm, claimed to be the optimum light for accelerating the growth of plants. SDK has achieved output of 11mW at the drive current of 20mA by developing a new light-emitting layer. The output figure represents what is claimed is the world's highest level for 660nm LED chips as of April 2009.
In addition to the development of the 660nm light-emitting layer, SDK has improved shape and arrangement of electrodes as well as the chip surface treatment method. Thus, the external quantum efficiency of LED lamps using the AlGaInP chips is claimed to be about three times as high as that of conventional red LED lamps.
Compared with the conventional red LED lamps, the AlGaInP LED lamps reduce electric power consumption by 70% at a given level of brightness, resulting in lower costs and energy consumption at plant growth facilities. Lower heat emission from light sources will also improve the plant growth environment.
Sample sales of the AlGaInP LED chips have started.
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