4/16/2023 0 Comments Yvo4 yvo4 core shellThe result is a compendium of key aspects to consider when devising and synthesizing this class of nanomaterials, with a keen eye on the foreseeable technological scenarios where they are poised to become front runners.read more read lessĪbstract: Symmetry-dependent properties such as ferroelectricity are suppressed at room temperature in Pb-free ABO3 perovskites due to antiferrodistortive dynamics (octahedral rotations/tilts), resulting in the preferential stabilization of centrosymmetric crystals. In this review, we provide an overview of the field of colloidal LnSNCs, while distilling the lessons learnt in terms of material design. The limited gamut of currently available colloidal LnSNCs is unfortunate, given the tremendous technological impact that these nanomaterials could have in fields like biomedicine and optoelectronics. As of late, halide perovskite nanocrystals have surged as materials of choice for doping lanthanides, but they have non-negligible shortcomings in terms of chemical stability, toxicity, and light absorption range. Although a great deal of experimental effort has been invested to produce efficient nanomaterials of that sort, relatively modest results have been obtained thus far. Therein, upon proper design, the poor light absorption intrinsically featured by lanthanides is compensated by the semiconductor moiety, which harvests the optical energy and funnel it to the luminescent metal center. A highly coveted class of such nanomaterials is represented by colloidal lanthanide-doped semiconductor nanocrystals (LnSNCs). Polarized molecules (NH2-BZA and NO2-BZA) were used for selective tuning of the electron density at the interface, impacting the Bi3+/VO43– energy level hybridization and the luminescent behavior of th.read more read lessĪbstract: The spectrally narrow, long-lived luminescence of lanthanide ions makes optical nanomaterials based on these elements uniquely attractive from both a fundamental and applicative standpoint. Moving the Bi3+ to the YVO4 shell layer allowed for the modification of Bi3+/VO43– energy level hybridization ion pairs without significant quenching of the Eu3+ ions in the core. ![]() Incorporating Bi3+ into YVO4:Eu3+ core NPs resulted in a red shift of the excitation edge by ∼30 nm and a decrease in the Eu3+ emission lifetime. ![]() This work aims to modify the energy level hybridization of doped (Eu3+/Bi3+) YVO4 nanoparticles (NPs) via surface functionalization with polarized molecules. However, these methods can permanently distort the crystal geometry or are limited to the continuous application of strong fields. Abstract: Tuning the luminescent properties of nanophosphors by modifying the energy level hybridization has been previously achieved by methods such as heat treatments or applying strong magnetic/electric fields.
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