III-V nitride semiconductors are suitable for LEDs having a color range from blue to green. Luminous intensity and color purity of these LEDs are so high that they have been used for many applications for full color displays and LCD backlighting and so on. In addition to natural colored LEDs, we have developed short wavelength LEDs, named TG Purple, the wavelength of which is typically around 380 nm. TG Purple has been realized by controlling the indium composition in GaInN well layers. It can activate photo-catalysts such as TiOx, and therefore, an air purifier for automotive applications has been developed by combining TG Purple and TiOx photo-catalyst. The short wavelength LED is now the best light source for automotive air purifiers using a photo-catalyst, because LEDs fulfill the mercury-less requirement for an environmental issue and do not need special circuits like conventional UV lamps such as black light lamps and cold cathode lamps. Furthermore, this short wavelength LED is used for phosphor excitation which generates many colors like blue, green, red, etc. It is likely that, with this technology, LEDs will take some part in the illumination market as one of the primary light sources, like incandescent lamps and fluorescent lamps.


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