Lead-Free, Luminescent Perovskite Nanocrystals Obtained through Ambient Condition Synthesis

Area of Science:

• Materials Science
• Nanotechnology
• Inorganic Chemistry

Background:

• Halide perovskites are promising materials, but lead toxicity necessitates sustainable alternatives.
• Current synthesis methods for high-quality perovskite nanocrystals (NCs) often require harsh conditions (inert gas, high temperatures).
• Lead-free double perovskites (LFDPs) offer a potential eco-friendly solution.

Purpose of the Study:

• To develop a facile, low-temperature, ambient-atmosphere synthesis for LFDPs.
• To investigate manganese doping in Cs2NaBiCl6 for photoluminescence.
• To explore the potential applications of these novel NCs.

Main Methods:

• Utilized a combination of hot injection and ligand-assisted reprecipitation (LARP).
• Synthesized manganese-doped Cs2NaBiCl6 nanocrystals (NCs) under ambient conditions.
• Optimized the Bi:Mn precursor ratio (9:1) for maximum photoluminescence.

Main Results:

• Achieved synthesis of emissive manganese-doped Cs2NaBiCl6 NCs at low temperatures, including room temperature.
• Identified a 9:1 Bi:Mn precursor ratio as optimal for bright orange photoluminescence and high quantum yield (QY).
• The material's indirect bandgap suggests suitability for photocatalysis due to extended carrier lifetimes.

Conclusions:

• A versatile and scalable synthesis for LFDP NCs has been established, operating under mild conditions.
• Manganese doping is crucial for achieving luminescence in this otherwise non-emissive material.
• These LFDP NCs show promise for photocatalysis and can be adapted for other compositions and applications.