Circularly polarized luminescence inorganic quantum dots:synthesis strategies and luminescence mechanism
The efficient integration of fluorescence brightness and emission asymmetry is crucial for the successful fabrication of high-quality circularly polarized luminescent materials,driving advancements in applications within this field.Inorganic quantum dots(QDs)possess extremely high stability,tunable photoluminescent properties,and a high fluorescence quantum yield,making them highly promising candidates for next-generation display applications.However,the synthesis of inorganic QDs simultaneously possessing high fluorescence brightness and strong emission asymmetry signals faces significant challenges.These challenges stem primarily from the presence of defect states resulting from incomplete surface passivation by chiral ligands and the unclear mechanisms governing chiral luminescence control arising from the interaction between chiral ligands and QDs.This review presents a detailed investigation into the generation and modulation of circularly polarized luminescence(CPL)properties in inorganic QDs,starting from the synthesis methods and chiral functionalization strategies.We systematically summarize various synthesis approaches for chiral QDs,encompassing direct aqueous synthesis,post-synthesis ligand exchange,and interface-mediated synthesis at water/oil interfaces.Each method is discussed in terms of its chemical intricacies,resulting material properties,and the associated advantages,limitations,and practical applications.Additionally,we delve into the underlying mechanisms that govern the modulation of CPL properties in these QDs materials.Through the application of pertinent empirical equations,we elucidate the intrinsic electron-physics mechanisms that influence CPL,fluorescence,and chirality signals.By integrating the effects of electron dipole and magnetic dipole transitions within the quantum dot material,we analyze the interrelationship among circularly polarized luminescence,fluorescence,and chirality signals,thus uncovering the fundamental principles that dictate CPL behavior in inorganic QDs.This comprehensive analysis provides valuable scientific insights for the fabrication of high-quality CPL QDs.
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