Fluorescence-enhanced Cs₄ PbBr₆ /CsPbBr₃ composites films synthesized by double-films solid phase reaction method.

Area of Science:

• Materials Science
• Inorganic Chemistry
• Photophysics

Background:

• Stable cesium lead bromide (CsPbBr3) films are challenging to synthesize using simple, eco-friendly methods due to issues with ligands, organic solutions, and vapor deposition.
• Existing methods often result in unstable CsPbBr3 films with poor photoluminescence properties.

Purpose of the Study:

• To enhance the stability and synthesis methods of CsPbBr3 films.
• To design novel Cs4PbBr6/CsPbBr3 composites for improved film performance.

Main Methods:

• Development of a double-films solid phase reaction.
• Design and synthesis of Cs4PbBr6/CsPbBr3 composite materials.

Main Results:

• Synthesized composite particles of 2-5 μm size.
• Achieved good photoluminescence properties in ambient conditions, with a highest photoluminescence quantum yield of 80%.
• Demonstrated excellent stability against air, temperature, and humidity, with a notable fluorescence enhancement after 4 days.

Conclusions:

• The double-films solid phase reaction offers a viable route for preparing stable CsPbBr3-based films.
• Cs4PbBr6/CsPbBr3 composites show promising photoluminescence and stability for potential applications.