Spectroscopic analysis demonstrates enhanced terbium emission via lead codoping in zinc sulfide nanoparticles, highlighting applications in aqueous sensing.
Pb2+ codoping enhances the Tb3+ emission in trivalent terbium-doped zinc sulfide [Zn(Tb)S] nanoparticles (NPs). The Tb3+-Pb2+ spatial proximity and a favorable codopant electronic energy level alignment contribute toward this emission brightening. This work tests the performance of the Tb3+ emission in the Zn(TbPb)S and Zn(Tb)S/Pb NPs, where the dopants within parentheses and after slashes indicate their synthetic and postsynthetic doping, respectively. When screened against steady-state and time-resolved photoluminescence, photoelectron spectroscopy, zeta potential, and infrared absorption of surface capping ligands, the Zn(TbPb)S NPs emerge as a superior sensitizer to generate Tb3+ emission. A core dominant Tb3+-Pb2+ interaction in Zn(TbPb)S NPs prompts a stronger Tb3+ emission when compared to the surface dominant Tb3+-Pb2+ interaction in Zn(Tb)S/Pb NPs. This doping strategy guided the NP design principle to control lanthanide emission, which expands the palette of lanthanide-based NP luminophores for practical applications. The Pb2+-sensitized Tb3+ emission brightening in the ZnS NPs in the precation exchange reaction conditions can find applications in Pb2+ sensing, cellular imaging, and light emitting diodes (LEDs).
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Bhunia et al. (2024) studied this question.
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