Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Surface ligands play an important role in regulating the surface states and recombination dynamics of perovskite quantum dots (QDs).[1] In this study, deuterated oleylamine (d-OAm), in which N–H bonds in oleylamine (OAm) were replaced with N–D bonds, was introduced to investigate the effects of ligand isotopic substitution on the structural and optical properties of MAPbI3 QDs. QDs were synthesized under identical conditions using the ligand-assisted reprecipitation method with OAm alone (“non-deuterated”), a 1:1 mixture of OAm and d-OAm (“50% deuterated”), or d-OAm alone (“100% deuterated”). Ligand deuteration was confirmed by FT-IR and ¹H NMR spectroscopy.
XRD analysis revealed the characteristic diffraction peaks of MAPbI3 in all three samples, while TEM analysis showed no substantial differences in average particle size. The UV–Vis absorption spectra exhibited nearly identical absorption-edge positions, and the photoluminescence (PL) peak energies remained at approximately 1.67–1.68 eV, with similar PL spectral shapes and full widths at half-maximum. In contrast, time-resolved PL (TRPL) measurements revealed a gradual increase in the average PL lifetime from 67 to 72 and 84 ns, respectively.
These results demonstrate that OAm ligand deuteration can enhance the lifetime of MAPbI3 QDs while preserving their average particle size and principal absorption and emission features. These improvements may arise from changes in the surface coordination environment and crystal microstructure induced by d-OAm incorporation. It suppress defect-related recombination and reduce vibrationally mediated nonradiative relaxation.[2] Both mechanisms may jointly contribute to reduced nonradiative losses, suggesting that isotopic substitution of surface ligands offers a promising strategy for tuning the PL properties and improving the emission efficiency of perovskite QDs.
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