Time-Controlled Synthesis of CdTe Quantum Dots for Tunable Photoluminescence
We report the synthesis and time‐dependent photoluminescence evolution of colloidal CdTe quantum dots (QDs), demonstrating that reaction duration can be used as an effective lever to tune their emission characteristics. By varying the synthesis time from 3 to 16 minutes, we observed a pronounced red...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
V.N. Karazin Kharkiv National University Publishing
2025-06-01
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| Series: | East European Journal of Physics |
| Subjects: | |
| Online Access: | https://periodicals.karazin.ua/eejp/article/view/25715 |
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| Summary: | We report the synthesis and time‐dependent photoluminescence evolution of colloidal CdTe quantum dots (QDs), demonstrating that reaction duration can be used as an effective lever to tune their emission characteristics. By varying the synthesis time from 3 to 16 minutes, we observed a pronounced red‐shift in the fluorescence maxima–spanning from near‐UV (~348 nm) to visible‐red (~646 nm) when excited at ~200 nm–and a corresponding increase in emission intensity. These trends, consistent with classical quantum confinement theory, suggest larger nanocrystal diameters and improved surface passivation emerge over the course of the reaction. Such behavior is crucial for optoelectronic and bioimaging applications, which often rely on precise emission wavelength control and high photoluminescence quantum yields. While the substantial rise in fluorescence intensity points to enhanced quantum yields, definitive quantification would require comparisons against well‐characterized standards. Nonetheless, these findings highlight the relative ease with which CdTe QD emission properties can be modulated by adjusting key synthesis parameters. Future work targeting extended reaction protocols and advanced capping strategies may further refine emission profiles and long‐term stability for applications in nano‐optoelectronics, sensing, and biomedical imaging. |
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| ISSN: | 2312-4334 2312-4539 |