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Luminescent Anisotropic Wurtzite InP Nanocrystals
David Stone1,2, Somnath Koley1,2, Sergei Remennik2
1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Nano Letters
|November 22, 2021
Summary
Researchers developed a green synthesis for indium phosphide (InP) nanocrystals using cation exchange. These novel InP nanocrystals exhibit enhanced luminescence and optical properties for optoelectronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Heavy metal-containing nanocrystals dominate optoelectronics but pose environmental concerns.
- Indium phosphide (InP) nanocrystals offer a promising heavy-metal-free alternative.
- Current InP synthesis methods lack precise control over size and properties.
Purpose of the Study:
- To develop a controlled synthesis of luminescent wurtzite InP nanocrystals.
- To achieve narrow size distribution and high photoluminescence quantum yield (PLQY).
- To investigate the optical anisotropy and its relation to the wurtzite crystal structure.
Main Methods:
- Cation exchange reaction from hexagonal copper phosphide (Cu3P) nanocrystals.
- Surface treatment using NOBF4 to remove excess copper and passivate surfaces.
- Optical spectroscopy (absorption, emission) and optical anisotropy measurements.
- Quantum-confined electronic level modeling.
Main Results:
- Synthesized luminescent wurtzite InP nanocrystals with a narrow size distribution.
- Achieved a narrow emission line (80 meV) and high PLQY (up to 40%).
- Demonstrated polarized optical transitions linked to the anisotropic wurtzite lattice.
Conclusions:
- Established a green synthesis route for high-quality wurtzite InP nanocrystals.
- The synthesized InP nanocrystals possess excellent optoelectronic properties, including color purity and light polarization.
- These findings pave the way for diverse optoelectronic applications using InP nanocrystals.
