PLE spectra analysis of the sub-structure in the absorption spectra of CdSeS quantum dots |
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| Authors: | Liu Bing-Can Pan Xue-Qin Tian Qiang and Wu Zheng-Long |
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| Institution: | The Department of Fundamental Courses, The Academy of Armored Force Engineering, Beijing 100072, China; Department of Physics, Beijing Normal University, Beijing 100875, China; Analytical and Testing Center, Beijing Normal University, Beijing 100875, China |
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| Abstract: | The semiconductor CdSeS quantum dots (QDs) embedded in glass are analysed by
means of absorption spectra, photoluminescence (PL) spectra and
photoluminescence excitation (PLE) spectra. The peaks of absorption spectra
shift to lower energies with the size of QD increasing, which obviously
shows a quantum-size effect. Using the PLE spectra, the physical origin of
the lowest absorption peak is analysed. In PLE spectra, the lowest
absorption peak can be deconvoluted into two peaks that stem from the
transitions of 1S3/2--1Se and 2S3/2--1Se respectively.
The measured energy difference between the two peaks is found to decrease
with the size of QD increasing, which agrees well with the theoretical
calculation for the two transitions. The luminescence peak of defect states
is also analysed by PLE spectra. Two transitions are present in the PLE,
which indicates that the transitions of 1S3/2--1Se and 2S3/2--1Se are responsible for the defect states luminescence. |
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| Keywords: | CdSeS PL spectra PLE spectra defect state |
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