Host sensitized lanthanide photoluminescence from post-synthetically modified semiconductor nanoparticles depends on reactant identity

Room temperature doping of Ln3+ in perovskite nanoparticles: a halide exchange mediated cation exchange approach

This study presents a halide exchange mediated cation exchange strategy for a room temperature doping of trivalent lanthanide cations (Ln³⁺) in cesium lead halide (CsPbX₃) nanoparticles (NPs). Post-synthetic addition of LnCl₃ [Ln = Nd, Sm, Eu, Tb, Dy, and Yb] to a solution of CsPbBr₃ NPs generates the corresponding lanthanide doped NPs which display host sensitized Ln³⁺ emission. Structural and spectroscopic characterizations indicate a successful halide exchange and substitutional displacement of Pb²⁺ by Ln³⁺. The effect of halide identity in controlling the Ln³⁺ sensitization was also evaluated. A photophysical framework is presented that can be used to predict the Ln³⁺ sensitization in perovskite NPs semiempirically, thereby removing the constraints of trial and error in designing a perovskite NP-Ln³⁺ host-guest combination.

Remarkable Difference in Pre-Cation Exchange Reactions of Inorganic Nanoparticles in Cases with Eventual Complete Exchange

Postsynthetic modification of inorganic nanoparticles (NPs) involving appropriate cation pairs at or near ambient conditions can exchange their spatial positions. The characterization of final products from these reactions although attracted...