Fine tuning of the spectroscopic properties of semiconductor CdSe nanorings by size

• The study shows Quantum Rings synthesis from 4.5ML CdSe nanoplatelets of different lateral size. • Relation of the emission of Quantum Rings is examined in correlation to the size of the initial nanoplatelet sample. The controlled synthesis of nanorings with tunable optical properties remains a challenge due to the interplay of structural parameters governing their quantum confinement. Here, we demonstrate a fine-tuned approach to fabricate nanorings with precise diameter control by leveraging the lateral dimensions of nanoplatelet precursors as a deterministic factor. Through systematic variation of the nanoplatelet size, we achieve nanorings with tailored absorption and emission profiles, directly correlating their spectral shifts with ring curvature and confinement effects. Spectroscopy reveals that the lateral size of the nanoplatelets dictates the final nanoring diameter, which in turn modulates the excitonic responses. This work establishes a scalable pathway to engineer nanoring properties for applications in nanophotonics and quantum materials, where size-dependent optical behavior is critical.