HIGH-TEMPERATURE SYNTHESIS OF CdTe QUANTUM DOTS WITH TUNABLE OPTICAL PROPERTIES

Zokirov Adxamjon Ilxomjon o‘g‘li; Axmedov Baxodir Baxramovich

Physics and technology

No. 6 (2024): Scientific Journal Fergana State University ADDITIONAL COLLECTION (Exact and Natural Sciences)

HIGH-TEMPERATURE SYNTHESIS OF CdTe QUANTUM DOTS WITH TUNABLE OPTICAL PROPERTIES

Zokirov Adxamjon Ilxomjon o‘g‘li^▸^▾
Axmedov Baxodir Baxramovich^▸^▾

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Submitted: February 1, 2025
Published: 2025-02-03

Abstract

We report a high-temperature colloidal synthesis of cadmium telluride (CdTe) quantum dots (QDs) enabling precise control over particle size and emission properties. By varying reaction conditions, including temperature, residence time, and precursor composition, we produced a series of CdTe QD samples emitting across the visible spectrum—from blue-green (~480 nm) to deep red (~665 nm)—under UV excitation. The samples, synthesized from cadmium acetate dihydrate and elemental tellurium in a mixture of trioctylphosphine (TOP), 1-octadecene (ODE), and oleic acid (OA), exhibit narrow size distributions, high photoluminescence quantum yields, and well-defined color transitions that confirm quantum confinement effects. These results underscore the effectiveness of high-temperature synthetic strategies for producing high-quality CdTe QDs suitable for advanced optoelectronic, bioimaging, and photovoltaic applications.

References

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[1] Murray, C.B., Norris, D.J., Bawendi, M.G. “Synthesis and Characterization of Nearly Monodisperse CdE (E = S, Se, Te) Semiconductor Nanocrystallites.” J. Am. Chem. Soc. 1993, 115, 8706–8715.

[2] Peng, X., Manna, L., Yang, W., Wickham, J., Scher, E., Kadavanich, A., Alivisatos, A.P. “Shape control of CdSe nanocrystals.” Nature 2000, 404, 59–61.

[3] Qu, L., Peng, Z.A., Peng, X. “Alternative Routes toward High Quality CdSe Nanocrystals.” Nano Lett. 2001, 1, 333–337.

[4] Rogach, A.L., Eychmüller, A., Hickey, S.G., Kershaw, S.V. “Infrared-emitting colloidal nanocrystals: synthesis, assembly, spectroscopy, and applications.” Small 2007, 3, 536–557.

[5] Reiss, P., Protière, M., Li, L. “Core/Shell Semiconductor Nanocrystals.” Small 2009, 5, 154–168.

[6] Li, J.J., Wang, Y.A., Guo, W., Keay, J.C., Mishima, T.D., Johnson, M.B., Peng, X. “Large-Scale Synthesis of Nearly Monodisperse CdSe/CdS Core/Shell Nanocrystals Using Air-Stable Reagents via Successive Ion Layer Adsorption and Reaction.” J. Am. Chem. Soc. 2003, 125, 12567–12575.