Japan since the 1997 world to prevent global warming since Kyoto meeting has been committed to the saving energy consumption reduce the emissions, and CO: for the 2010 years of CO: eduction amounts to 1999 levels. In this goal in the lighting in the category of implementing a "21 century of light", Akari referred to as the JiYiHua, this plan calls for efficient semiconductor light source, reducing the energy consumption of all 20 a 40% lighting energy consumption.
The plan by the new energy and industrial technology development organization (NEDO) and Japan research and development center of metal (JRCM) joint operation, and the industry and its (MTEI) provide funds to NEDO. The plan by 7 university, 13 enterprise and a association (Japanese electrical ball manufacturers association, JELMA) implementation of cooperative research and development.
Expect the plan to low energy consumption, high brightness, long life, good reliability of white LED instead of traditional incandescent light bulb and fluorescent, especially it no mercury, is the green environmental protection product more respected.
A few years ago, there was a cause of the LanGuang LED Gu marry nitrogen (InxGa a, N) it has produced a phosphor yellow complex YAG: Ce, 'get the white light, its efficiency reached 60 lm/W, then this white LED the performance and the forward voltage and fluorescence coating relationship is too big, so Akan plan is to use uv fluorescent red in nearly stimulate, green, blue, white light after three colored light by this method and the three colors of fluorescent lamp principle of which is similar. At present the method of the quantum efficiency is as high as 43%, work has 382 nm wavelength.
The table below shows now produces two method and the white light three forms: the contents of the table shows, the first and the third way is the most common, but there are a lot of problems, a lot of problems, and breakthrough has Akari adopted the second form, which is nearly ultraviolet LED inspire R, G, B phosphor to 0. Y. G. B phosphor got, superior performance and expectations white light quantum efficiency reached 60% in 2006, to 120 in 20 ro efficiency lm/W.