Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.410
Publication date: 16th December 2024
Achieving high photoluminescence quantum yield (PLQY) in magic-sized clusters (MSCs) of III-V semiconductors such as indium phosphide (InP) remains a significant challenge due to their strong oxophilicity and high sensitivity to surface defects. Here, we report the synthesis of highly luminescent InP MSCs through a novel kinetically controlled surface fluorination strategy. Utilizing the Friedel–Crafts acylation reaction, we generated hydrogen fluoride (HF) in a controlled manner, enabling effective surface passivation. This approach mitigated non-radiative recombination pathways by removing surface oxides and stabilizing surface defects, resulting in a PLQY of ~18%, the highest reported for InP MSCs. Comprehensive analyses, including PL lifetime measurement, transient absorption spectroscopy, and X-ray photoelectron spectroscopy, revealed that the enhanced luminescence arises from reduced surface trap states. Structural integrity and uniformity were confirmed through X-ray diffraction, Raman spectroscopy, and extended X-ray absorption fine structure analysis, demonstrating the preservation of the zinc-blende MSC framework. These findings not only advance the understanding of III-V MSCs but also highlight the potential of InP MSCs as environmentally benign, monodisperse, and highly efficient emissive materials for next-generation optoelectronic applications.
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