Microbe‐Assisted Synthesis and Luminescence Properties of Monodispersed Tb<sup>3+</sup>‐Doped ZnS Nanocrystals

W1520020490 · 수집 2026-10-04 18:12:13

T10321 Quantum Dots Synthesis And Properties

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Tb 3+ ‐doped zinc sulfide (ZnS:Tb 3+ ) nanocrystals were synthesized by spray precipitation with sulfate‐reducing bacterial (SRB) culture at room temperature. The morphology of the SRB and ZnS:Tb 3+ nanocrystals was examined by scanning electron microscopy, and the ZnS:Tb 3+ nanocrystals were characterized by X‐ray diffractometry and photoluminescence (PL) spectroscopy. The PL mechanism of ZnS:Tb 3+ nanocrystals was further analyzed, and the effects of Tb 3+ ion concentration on the luminescence properties of ZnS:Tb 3+ nanocrystals were studied. ZnS:Tb 3+ nanocrystals showed a sphalerite phase, and the prepared ZnS:Tb 3+ nanocrystals had high luminescence intensity under excitation at 369 nm. The main peak position of the absorption spectra positively blueshifted with increasing concentrations of Tb 3+ dopant. Based on the strength of the peak of the excitation and emission spectra, we inferred that the optimum concentration of the Tb 3+ dopant is 5 mol%. Four main emission peaks were obtained under excitation at 369 nm:489 nm ( 5 D 4 → 7 F 6 ), 545 nm ( 5 D 4 → 7 F 5 ), 594 nm ( 5 D 4 → 7 F 4 ), and 625 nm ( 5 D 4 → 7 F 3 ). Our findings suggest that nanocrystals have potential applications in photoelectronic devices and biomarkers.

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