Publication date: 15th December 2025
The convergence of highly efficient emitting nanomaterials with additive manufacturing offers a transformative approach to optoelectronic device fabrication. In this work, we report the integration of CsPbBr3 perovskite quantum dots (QDs) -characterized by a photoluminescence quantum yield (PLQY) of 96.7%, high-purity green emission at 508 nm, and a narrow linewidth of 16.5 nm- into photocurable resins for Two-Photon Polymerization (2PP).
While conventional integration strategies often result in aggregation and significant efficiency loss, we demonstrate the fabrication of intrinsically luminescent, defect-free 3D microstructures. Our method relies on a strategic surface ligand exchange, replacing long-chain DDAB (didodecyldimethylammonium bromide) with short-chain SCN⁻ (thiocyanate) ligands. This surface engineering is critical to facilitate hierarchical self-assembly, promoting the formation of highly ordered, isolated cubic superlattices within the polymer matrix.
This structural organization preserves the optoelectronic integrity of the QDs in the printed nanocomposites. Spectroscopically, the transition to the superlattice state is evidenced by a distinct redshift of the emission peak to ~521 nm. Rather than attributing this shift to degradation, we identify it as a signature of electronic coupling between the ordered nanocrystals. Furthermore, Time-Resolved Photoluminescence (TRPL) analysis reveals a marked modification in emission dynamics, characterized by the emergence of an ultrafast decay component (≈ 0.75 ns). We interpret this acceleration as evidence of collective emission phenomena, arising from coherent emitter interactions within the superlattice.
These findings suggest that the resin acts not merely as a passive scaffold, but as an active medium that supports the organization of quantum emitters into functional superstructures. This work establishes a roadmap for high-resolution 3D printing of active photonic components, with potential applications in on-chip quantum light sources.
The authors thank the Spanish AEI and MCIU for support through the grant PID2023-151632OB-C21.
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