Spectroscopic Characteristics of Dual - Color CdSe/CdS/CdSe1-xSx/CdS Quantum Dot - Quantum Wells
Main Article Content
Abstract
In this work, preparation and spectroscopic characteristics of CdSe/CdS/CdSe1-xSx/CdS core/shell 1/well/shell 2 structure were presented. The obtained quantum dot - quantum well (QDQW) samples exhibited two emission peaks at 1.97 and 2.2 eV. Excitation power dependent photoluminescence (PL) of the QDQWs indicated that the integrated emission intensities of these peaks increase linearly with excitation power densities up to 1.3×102 mW/cm2. The temperature dependence of the bandgap energies of the QDQW’s core and well layer was well described using the Varshni expression. Evidence of the existence of “local wells” in the QDQW’s well layer that leads to a more significant change in the maximum position and full width at half maximum of the well’s emission peak compared to the core’s counterpart was discovered. Annealing samples resulted in the considerable increase of the well layer’s emission efficiency.
Keywords: Quantum dot - quantum wells, dual - color, spectroscopic characteristics.
Keywords:
quantum dot - quantum wells, dual - color, spectroscopic characteristics
References
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[12] E. A. Dias, S. L. Sewall, P. Kambhampati, Light Harvesting and Carrier Transport in Core/Barrier/Shell Semiconductor Nanocrystals, J. Phys. Chem. C, Vol. 111, 2007, pp. 708-713, https://doi.org/10.1021/jp0658389.
[13] E. A. Dias, A. F. Grimes, D. S. English, P. Kambhampati, Single Dot Spectroscopy of Two-color Quantum Dot/Quantum Shell Nanostructures, J. Phys. Chem. C, Vol. 112, 2008, pp. 14229-14232, https://doi.org/10.1021/jp806621q.
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[15] N. Razgoniaeva, M. R. Yang, C. Colegrove, N. Kholmicheva, P. Moroz, H. Eckard, A. Vore, M. Zamkov, Double-Well Colloidal Nanocrystals Featuring Two-color Photoluminescence, Chem. Mater., Vol. 29, 2017,
pp. 7852-7858. https://doi.org/10.1021/acs.chemmater.7b02585.
[16] U. Soni, A. Pal, S. Singh, M. Mittal, S. Yadav, R. Elangovan, S. Sapra, Simultaneous Type-I/type-II Emission from CdSe/CdS/ZnSe Nano-heterostructures, ACS Nano, Vol. 8, 2014, pp. 113-123, https://doi.org/10.1021/nn404537s.
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[23] S. Cao, J. J. Zheng, J. L. Zhao, Z. B. Yang, M. H. Shang, C. M. Li, W. Y. Yang, X. S. Fang, Robust and Stable Ratiometric Temperature Sensor Based on Zn-In-S Quantum Dots with Intrinsic Dual-dopant Ion Emissions, Adv. Funct. Mater., Vol. 26, 2016, pp. 7224-7233, https://doi.org/10.1002/adfm.201603201.
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pp. 457-471, https://doi.org/10.1071/CH07046.
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[26] R. Xie, U. Kolb, J. Li, T. Basche, A. Mews, Synthesis and Characterization of Highly Luminescent CdSe-Core CdS/Zn0.5Cd0.5S/ZnS Multishell Nanocrystals, J. Am. Chem. Soc., Vol. 127, 2005, pp. 7480-7488, https://doi.org/10.1021/ja042939g.
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[29] A. Roy, A. K. Sood, Surface and Confined Optical Phonons in CdSxSe1-x Nanoparticles in A Glass Matrix, Phys. Rev. B, Vol. 53, 1996, pp. 12127-12132, https://doi.org/10.1103/PhysRevB.53.12127.
[30] A. G. Joly, W. Chen, D. E. McCready, J. O. Malm, J. O. Bovin, Upconversion Luminescence of CdTe Nanoparticles, Phys. Rev. B, Vol. 71, 2005, pp. 165304(1)-165304(9), https://doi.org/10.1103/PhysRevB.71.165304.
[31] D. Battaglia, B. Blackman, X. Peng, Coupled and Decoupled Dual Quantum Systems in One Semiconductor Nanocrystal, J. Am. Chem. Soc., Vol. 127, 2005, pp. 10889-10897, https://doi.org/10.1021/ja0437297.
[32] D. Valerini, A. Cretí, M. Lomascolo, L. Manna, R. Cingolani, M. Anni, Temperature Dependence of the Photoluminescence Properties of Colloidal Cdse/Zns Core/Shell Quantum Dots Embedded in A Polystyrene Matrix, Phys. Rev. B, Vol. 71, 2005, pp. 235409(1)- 235409(6), https://doi.org/10.1103/PhysRevB.71.235409.
[33] J. Xu, D. Battaglia, X. Peng, M. Xiao, Photoluminescence from Colloidal CdS-CdSe-CdS Quantum Wells, J. Opt. Soc. Am. B, Vol. 22, 2005, pp.1112-1116, https://doi.org/10.1364/JOSAB.22.001112.
[34] E. F. Schubert, E. O. Gobel, Y. Horikoshi, K. Ploog, H. J. Queisser, Alloy Broadening in Photolurninescence Spectra of AlxGal1-xAs, Phys. Rev. B, Vol. 30, 1984, pp. 813-820, https://doi.org/10.1103/PhysRevB.30.813.
[35] Z. J. Jiang, D. F. Kelley, Stranski-Krastanov Shell Growth in ZnTe/CdSe Core/Shell Nanocrystals, J. Phys. Chem. C, Vol. 117, 2013, pp. 6826-6834, https://doi.org/10.1021/jp4002753.