Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: 75
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two PL measurements suggests that, while the total number of photons is essentially
constant with angle prior to 600 at angles away from the maximum there is some form
of broadening of the PL spectrum. In fact, if we fit the PL spectra using the fitting
method discussed in 3.7, we see that there is an exchange in emission between the
main emission of the quantum well and the first and second phonon-replicas of the
5.7 Modification of Electron-Phonon Coupling
The origin of phonon replicas, as explained in 2.5 is due to electron phonon
coupling within the QW. Interaction between electrons and the lattice produces a non-
zero probability of emitting a phonon during recombination. It is well known that the
strength of the electron-phonon coupling is a function of the wavevector of the phonon
as well as the orientation of the exciton. Since we know that the presence of the NPs
0.6 , 1.0
0 . 4 - 0.2
0.2-,, - 0.1
0 30 60 90 0 30 60 90
0 (Degrees) 6 (Degrees)
Figure 5.10 a, The Huang-Rhys parameter S as a function of angle for the reference
(black), Au NP (red) and Ag NP (blue) samples. b, The intensity of the main emission
and first (dashed) and second (dotted) phonon replicas normalized with respect to the
total emission (i.e. IPR-O + IPR-1 + IPR-2= 1). The gray shaded region represents missing
values replaced by interpolation with a spline.
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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/m1/85/: accessed July 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .