2025/04~
Doctoral Student, Graduate School of Chemical Sciences and Engineering, Hokkaido University
2025/04~
NIMS Junior Researcher, MANA, NIMS
2022/10~2025/03
Graduate Student (M.Sc.), Department of Chemistry, University of Hamburg, Germany
2018/10~2023/03
Undergraduate Student (B.Sc.), Department of Chemistry, University of Hamburg, Germany

The solution-based synthesis of colloidal InSb quantum dots, a promising lead- and mercury-free material for near-infrared (NIR) and short-wavelength infrared (SWIR) applications, remains challenging. Most reported synthetic methods rely on highly reactive organometallic reducing agents, such as LiEt3BH (“Superhydride”), leading to excessive side product formation and poor controllability of particle size distributions.1 A milder approach, employing the more stable tris(dimethylamino)phosphine as a reducing agent, allows for controlled growth of phase-pure InSb QDs with defined optical properties, using safer reagents and enabling a more tunable synthetic framework.2 By further adjusting the reaction conditions, the same aminophosphine precursor also acts as a phosphide source in the second step, enabling the additional growth of a surface-passivating InP shell without requiring intermediate purification.3 The obtained products exhibited photoluminescence quantum yields of up to 7%, comparable to the highest values reported so far. Incorporation into a QLED device represents the first successful demonstration of an InSb/InP core/shell QD-based device exhibiting electroluminescence in the NIR and SWIR ranges.

1. H. Xie et al., Laser Photonics Rev. 19, 2401204(2025). DOI: 10.1002/lpor.202401204
2. K. Nemoto et al., Chem. Mater. 38, 3486-3495(2026). DOI: 10.1021/acs.chemmater.5c03273
3. C. Zhang et al., Chem. Commun. 62, 5051-5055(2026). DOI: 10.1039/d5cc06351e