Correlation of theory with experimental photon absorption and photon emission of quasitype II CdS/ZnS QDs

Carlos Villa-Angulo; Francisco J. Guayante-Santacruz; Rafael Villa-Angulo; Iván O. Hernández-Fuentes; Ricardo Morales-Carbajal; José R. Villa-Angulo

doi:10.1117/1.JNP.12.046010

27 October 2018 Correlation of theory with experimental photon absorption and photon emission of quasitype II CdS/ZnS QDs

Carlos Villa-Angulo, Francisco J. Guayante-Santacruz, Rafael Villa-Angulo, Iván O. Hernández-Fuentes, Ricardo Morales-Carbajal, José R. Villa-Angulo

Author Affiliations +

Journal of Nanophotonics, Vol. 12, Issue 4, 046010 (October 2018). https://doi.org/10.1117/1.JNP.12.046010

Abstract

Predictions for the photon absorption coefficient (α) and photoluminescence (PL) of quasitype II CdS/ZnS core/shell nanocrystals [quantum dots (QDs)] have been obtained using a straightforward developed procedure. The developed procedure begins by solving the three-dimensional (3-D) Schrodinger equation written in spherical coordinates. Then, α is obtained by solving an equation based on the strict k-selection approach, and PL is derived by solving the Kubo–Martin–Schwinger relationship. This formulation allows the prediction of fundamental QD energy properties as a function of the QD radius. The predicted properties include quantized energy levels, effective bandgap, effective photon absorption wavelength, and effective photon emission wavelength. In addition, CdS/ZnS QDs were synthetized and stabilized based on previously reported procedures. Experimental measurements of α and PL were found to be very well matched to the calculated results. Hence, the developed procedures can be of great interest for designers who correlate theoretical results with experimental measurements to predict next generation QD performance for nanophotonics applications.

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Carlos Villa-Angulo, Francisco J. Guayante-Santacruz, Rafael Villa-Angulo, Iván O. Hernández-Fuentes, Ricardo Morales-Carbajal, and José R. Villa-Angulo "Correlation of theory with experimental photon absorption and photon emission of quasitype II CdS/ZnS QDs," Journal of Nanophotonics 12(4), 046010 (27 October 2018). https://doi.org/10.1117/1.JNP.12.046010

Received: 28 August 2018; Accepted: 4 October 2018; Published: 27 October 2018

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