Rational growth of highly luminescent CsPbBr₃ nanoparticles via alkali metal doping-enabled modification of glass networks

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Embedding halide perovskite nanoparticles (NPs) in glass enhances their stability against air and moisture.
• Controlling NP precipitation and luminescence within glass remains challenging due to limited understanding of glass network topology effects.

Purpose of the Study:

• To optimize halide perovskite NP growth and luminescence within glass matrices.
• To investigate the role of alkali metal ions in modulating glass network topology for improved NP properties.

Main Methods:

• Utilizing alkali metal ions as "B-phase structural scissors" to control NP precipitation and aggregation.
• Analyzing glass network topology modulation and its impact on NP formation.
• Conducting photoluminescence quantum yield measurements and thermodynamic analysis of thermal activation energy.

Main Results:

• Li doping increased the photoluminescence quantum yield of CsPbBr3 perovskite NPs by 39%.
• Alkali metal ions reduced thermal activation energy, leading to larger NPs.
• CsPbBr3 NP-embedded glass retained near-unity luminescence after 180 days of water soaking, demonstrating excellent stability.

Conclusions:

• Alkali metal ions effectively modify glass networks, optimizing NP precipitation and photoluminescence.
• This approach provides a facile strategy for designing stable, high-performance NP-functionalized glass.
• The findings offer deeper insights into host-dependent NP-functionalized glass design.