Technology
Light emitting
diode (LED) is growing widespread rapidly as interior illumination, and organic
electroluminescence (Organic EL) is supposed to follow LED. The currently widespread
white LED has 100-150 lm per watt, while the organic EL under development has
50-80 lm per watt. Nissan Chemical developed a new coating to increase the brightness of organic EL, and it is confident that the new coating will
increase the brightness of organic EL to 100 lm per watt.
The indium tin
oxide (ITO) electrode covering the light source has an optical refraction index
between 1.9 and 2.1, whereas the optical refraction index of cover glass is
about 1.5. Because the difference of optical refraction index between the two
is so great, light emitted from a light source returns to the light source
after reflecting off the glass and generates heat, resulting in extra energy
consumption. The Nissan Chemical’s new coating can adjust the optical refraction
index between 1.6 and 1.81 that is the middle between the optical refraction
indexes of a light source and glass, making it possible to extract light from
the glass effectively. Components of this new coating include a triazine-type
organic polymer containing atoms of nitrogen and carbon. It has a high degree
of transparency that transmits more than 90% of visible light with a wavelength
longer than 400 nanometers. Organic EL illumination generates light closer to
natural light than LED. The company plans to commercialize the new product in
2013.
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