Publication date: 21st July 2025
We designed and synthesized a 2-Hexyl Decanoic Acid (2HDA) as a new ligand used in PbS/PbSe nanocrystal (NC) sensitized upconversion of near infrared (NIR) photons. Under optimal conditions, comparing 2HDA functionalized NCs with Straight-chain ligand NCs as sensitizers, the upconversion quantum yield (QY) was enhanced 100 times. The surface density of 2HDA controls the solubility of functionalized NCs and the upconversion QY. By increasing the concentration of 2HDA in the ligand exchange solution, the number of 2HDA ligand per NC increases. The upconversion QY is maximized at a ligands concentration of 6.28umol. We further demonstrate that this ligand engineering strategy proves effective not only in solution systems but equally in solid-state systems, achieving an efficiency of 1.15%. Upon the addition of DBP, this efficiency increases to 9.26%. This provides a universal and cheap optimization strategy for enhancing the performance of quantum dot-organic hybrid upconversion materials and their applications in solid-state films.
This work was supported by the National Natural Science Foundation of China (No. 12474031 and W2433157), and European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Actions grant (no. 842271, TRITON project). Z.Z. also acknowledges financial supports from Guangdong province (2025A1515010298) and Guangzhou city (SL2023A04J00824).
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