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Ultraviolet-visible spectroscopy tests examine the absorption or reflective spectroscopy of a material over the ultraviolet-visible spectral region. The test itself bombards a sample of a material with light of varying wavelengths in a spectrophotometer, as it’s exposed to different light the spectrophotometer monitors the intensity at which the sample absorbs (or reflects) the light at these different wavelengths. And with the help of logging software it can produce spectral readouts like the one below:
 
[[Image:Spectrogram of CdSe quantum dots.png|center|Spectral readout of CdSe UV-Vis test]]
[[Image:Spectrogram of CdSe quantum dots.png|center|Spectral readout of CdSe UV-Vis test]]
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 is absorbed either in or close to the UV spectrum and the intensity of light absorbed dropped significantly. 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 absorbed is also known.
[[Image:PlanksRelation.JPG]]
UV-Vis spectroscopy tests could be performed after Where E is the synthesis of the CdSe Ink described in the sections aboveBand Gap energy, h is [http://en.wikipedia. And the desired result would be like the spectrogram aboveorg/wiki/Planck_constant Planck Constant], where most light c is absorbed either in or close to the UV spectrum and the intensity of light absorbed dropped significantly[http://en.wikipedia. This test needs to be performed on the ink to be used before printing to ensure that is capable org/wiki/Speed_of_light Speed of catching Light], and using sunlightλ is [http://en.wikipedia.org/wiki/Wavelength Wavelength].
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