Modeling and Simulation of Emission Wavelength of The CdSe, CdS and ZnS Semiconductor Nanostructures for Device Applications
| International Journal of Material Science and Engineering |
| © 2025 by SSRG - IJMSE Journal |
| Volume 11 Issue 1 |
| Year of Publication : 2025 |
| Authors : H. I. Ikeri, M C. Ohakwere-Eze, C. T. Ezeh, O. K. Okongwu, U. D. Chukwuma |
10.14445/23948884/IJMSE-V11I1P102
How to Cite?
H. I. Ikeri, M C. Ohakwere-Eze, C. T. Ezeh, O. K. Okongwu, U. D. Chukwuma, "Modeling and Simulation of Emission Wavelength of The CdSe, CdS and ZnS Semiconductor Nanostructures for Device Applications," SSRG International Journal of Material Science and Engineering, vol. 11, no. 1, pp. 10-15, 2025. Crossref, https://doi.org/10.14445/23948884/IJMSE-V11I1P102
Abstract:
This work focuses on the theoretical modeling and simulation of emission wavelengths in semiconductor Quantum Dots (QDs), particularly those composed of CdSe, CdS, and ZnS. The formulated model clearly demonstrates a direct quadratic dependence between the quantum dot size and its corresponding emission wavelength: as the QD size increases, the emission shifts toward longer wavelengths. In contrast, reducing the size intensifies quantum confinement effects, resulting in a wider bandgap and shorter emission wavelengths, commonly called a blue shift. The tunable emission ranges observed are approximately deep red to green for CdSe (As a result, CdSe quantum dots are widely used in optical displays due to their tunable emission across the visible spectrum), yellow to blue for CdS (These emission properties make CdS quantum dots suitable for use in visible-light LEDs, particularly in the blue-green range) and blue to ultraviolet for ZnS (As a result ZnS QDs are used in solid-state lighting for blue and ultraviolet emission and photodetectors due to their wide band gap). These optical properties stem from the discrete energy levels introduced by quantum confinement, contrary to the continuous bands in bulk semiconductors. Notably, ZnS displays the most pronounced confinement effects and emits at the shortest wavelengths among the three materials, attributed to its relatively large intrinsic bandgap, making it an excellent candidate for high-power devices and can operate at high temperatures, making them suitable for applications in harsh vicinities.
Keywords:
Nanostructures, Quantum dots, Emission wavelength, Confinement effect, Blue shift, Charge carriers.
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