Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: 29
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between 120 and 300nm. Excitation was provided by the 325 nm line of the same HeCd
laser used for far-field PL measurements, fed into the fiber through a UV-vis 40x
objective. The spectral data was recorded using the NSOM's built-in CCD-based
3.7 Fitting Spectra
Most spectra will consist of one or more peaks of Gaussian or Lorentzian shape.
These peaks are generally produced by different phenomena, such as the phonon
replicas mentioned in the previous chapter. By fitting the data with a series of
Gaussians it is possible to extract information about these peaks which can then
provide further insight into the phenomena being studied. Even for a simple spectrum
consisting of a single Gaussian fitting the result can help to extract parameters such as
the center of emission and the full-width at half-maximum (FWHM) which might
otherwise be obscured by noise.
While there are significant advantages to fitting spectral data, there are also
serious pitfalls involved. The simplest way to make the dangers of fitting clear is to
remember that any curve can be approximated by a sufficient number of Gaussians.
Therefore it is important to have a model for the emission which is based on the
underlying physics. This model should include an understanding of the number of
emission peaks, the relations between them, and reasonable starting guesses for their
energy, FWHM and amplitude. Furthermore the model should place constraints on the
parameters to ensure that the peaks cannot swap positions from measurement to
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Llopis, Antonio. Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures, dissertation, May 2012; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc115113/m1/39/: accessed March 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .