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UV-Vis spectroscopy tests could be performed after the synthesis of the CdSe Ink described in the sections above. And the desired result would be like the spectral readout above, where most light absorbed is absorbed either in or close to the UV spectrum and the intensity of light absorbed dropped significantlyoutside that range. This test needs to be performed on the ink to be used before printing to ensure that is capable of catching and using sunlight. Using the information from this readout, it is also possible to calculate the material's [http://en.wikipedia.org/wiki/Band_Gap Band Gap] Energy. Using Plank's Relation, the energy required to excite electrons through the material's band gap can be calculated if the maximum wavelength of light capable of being absorbed is also known.
[[Image:PlanksRelation.JPG]]
Where E is the Band Gap energy, h is [http://en.wikipedia.org/wiki/Planck_constant Planck Constant], c is the [http://en.wikipedia.org/wiki/Speed_of_light Speed of Light], and λ is [http://en.wikipedia.org/wiki/Wavelength Wavelength].As already stated, the wavelength must be known. Looking at the spectral readout, you can see that while at 400 nm the material is absorbing ambient light at a high intensity but drops shortly afterward. Just looking at the readout, one could estimate that between 500 and 550 nm is where the bottom of the bell curve starts, and that would be the wavelength to be used in the calculation for energy{{PE|http://www.perkinelmer.com/Content/applicationnotes/app_uvvisnirmeasurebandgapenergyvalue.pdf}}
== Design ==
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