The researchers combined the leading STEM techniques with high-resolution
electron energy loss spectroscopy (EELS), which measured the energy lost by
electrons as they passed through the sample. Post-doctoral researchers Kamal
Baloch of MIT -- the lead author of the study -- and Aaron Johnston-Peck of CFN
actually applied these imaging techniques to the same samples that first
launched the controversy over clustering, helping further settle the issue.We
found that the indium-rich clusters do not actually exist in these samples, even
though they remain efficient light emitters," Baloch said. "While clustering may
still occur in other samples, which may be prepared in different ways, the
important point is that we've established a foolproof method for investigating led high bay light materials. We can use these non-destructive imaging techniques to explore
the fundamental relationship between cluster formation and light emission to
help unlock the secrets of this amazing alloy.
Beyond the advanced imaging instruments, researchers used the expertise of Brookhaven Lab physicist Kim Kisslinger, who specializes in nanoscale sample preparation. The InGaN samples were reduced to a thickness of just 20 nanometers, an essential step in priming the materials for STEM and EELS experimentation. The samples were also painstakingly cleaned and polished to eliminate artifacts that might impact image resolution.The research was supported by the Center for Excitonics, an Energy Frontier Research Center funded by the U.S. Department of Energy's Office of Science. The work at Brookhaven Lab's Center for Functional Nanomaterials was also supported by DOE's Office of Science, with additional work carried out at the MIT Center for Materials Science Engineering.
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Beyond the advanced imaging instruments, researchers used the expertise of Brookhaven Lab physicist Kim Kisslinger, who specializes in nanoscale sample preparation. The InGaN samples were reduced to a thickness of just 20 nanometers, an essential step in priming the materials for STEM and EELS experimentation. The samples were also painstakingly cleaned and polished to eliminate artifacts that might impact image resolution.The research was supported by the Center for Excitonics, an Energy Frontier Research Center funded by the U.S. Department of Energy's Office of Science. The work at Brookhaven Lab's Center for Functional Nanomaterials was also supported by DOE's Office of Science, with additional work carried out at the MIT Center for Materials Science Engineering.
These products offer un-matched luminous efficacies when compared to competing technologies having similar CRI. Such high performance is achieved by the unique ability of the RadiantFlex manufacturing process to accurately layer different phosphors and achieve unique spectral shapes while minimizing self-absorption and scattering losses.The most common usage of phosphors in solid-state lighting (SSL) involves pre-mixing micron-size particles with a polymer and directly depositing the phosphor slurry on the LED die. Unfortunately, such traditional approach results in lower wall plug efficiency (WPE) due to optical scattering losses and light trapping within the phosphor/polymer matrix. Furthermore, as LED power increases, this method becomes more limited because of the significant thermal and optical loads on the phosphor, which lead to further drop in efficiency and performance at higher temperatures and power densities. Therefore, the remote phosphor approach becomes more attractive.wholesale nichia 160w led high bay light Corporation has been developing and supplying remote phosphor technologies and products since its inception in 1998 and has one of the earliest known patents in this area involving an LED and a phosphor compound.
you can read more:http://yahamflood.blogspot.com/2013/11/that-disconnect-helped-motivate-this.html
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