According to
the National Science Council, are now in the shortest wavelength UV LED
is a few days ago NTT (Nippon Telegraph and Telephone Corporation) by
the R & D, the wavelength around 210 nm. In addition to the
application of the UV LED manufacturing high-performance white LED, the
emission wavelength range from 280 nm to 350 nm band of the UV LED in
environmental protection, medical devices, biological detection and
many other areas also have important applications, particularly if used
in the photocatalyst uses is even more cause for concern. Based on UV
LED's with a bright future, research and development on how to improve
the effectiveness of UV LED light becoming important. As the very short
wavelength ultraviolet light, so UV LED as the main light-emitting
layer material to have a larger direct band gap III-nitride-based
semiconductor materials. Now known to affect the efficiency of UV LED
light-emitting elements such as: the internal structure of the
polarization charge, the stress caused by defects in active zone poorly
designed, as a result of total reflection caused by the external
quantum efficiency of poor and so on. |
