Development of deep UV LED by AIST
Advanced Industrial Science and Technology (AIST) of Japan developed a deep UV LED that uses diamond semiconductor. The reason for selecting diamond is due to the stability of excitons that is generated in the diamonds responsible for emitting light. The excitons are electron-hole pair which behaves very much like a particle. Unlike the general excitons that are vulnerable to heat the diamond generated excitons are stable at around 600 degrees Celsius. Due to this heat resistance characteristic the light emission intensity not only does not degrade but on the contrary it continues to increase according to the institute. The deep UV LED is made of a 2mm-square diamond substrate where a p-i-n-structured diamond semiconductor has been stacked. It is capable of emitting deep ultraviolet light with an emission wavelength of 235nm and the output of 30microW when a 320mA current is supplied to it. However, the diamond LED is facing few issues toward its commercialization roadmap one being the high cost of diamond itself and also the substrate’s size. In regard to these issues AIST is developing a technique to stack a polycrystalline diamond semiconductor film on a Si wafer.
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[...] Japan Technology Information put an intriguing blog post on Development of deep UV LED by AISTHere’s a quick excerptAdvanced Industrial Science and Technology (AIST) of Japan developed a deep UV LED that uses diamond semiconductor. The reason for selecting diamond is due to the stability of excitons that is generated in the diamonds responsible for emitting light. The excitons are electron-hole pair which behaves very much like a particle. Unlike the general excitons that are vulnerable to heat the diamond generated excitons are stable at around 600 degrees Celsius. Due to this heat resistance characteristic [...]
[...] of modern technology that could clean up these shitholes. When the founder of Greenpeace quits Development of deep UV LED by AIST – japantechniche.com 03/26/2009 Advanced Industrial Science and Technology (AIST) of Japan [...]
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[...] shorter are not available commercially. Based on this challenge ASIT has successfully developed a diamond based LED, capable of generating highly efficient UV light emission by excitons, an inherent characteristic [...]