Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: 24
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3.4.2 Angle-Dependent PL
For angle-dependent PL measurements there are two possibilities for measure.
Either the emitted PL spectrum is measured as a function of the angle of incidence of
the excitation source, or as a function of the angle of emission from the sample. The
former should contain some information about the absorption properties of the sample
as a function of the incident angle, whereas the latter should carry more information
about the recombination processes within the system.
In this experiment case I have measured the spectrum as a function of emission
angle since the electron-phonon coupling resulting in phonon replicas is strongly
wavevector dependent . In order to make the measurements, I mounted a fiber
optical waveguide on an arm attached to a goniometer base centered beneath the
X Beam Stop
SSlit . :e
Figure 3.4 Schematic diagram of the angle-dependent PL experiment. A
fiber optical waveguide is mounted along with an iris on an goniometer-
mounted arm centered on the sample. The angle of rotation is measured
relative to the normal of the sample. The fiber then connects directly to
the Triax spectrometer using a fiber mount adapter.
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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/m1/34/: accessed May 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .