A Universal Approach for Controllable Synthesis of n-Specific Layered 2D Perovskite Nanoplates

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Two-dimensional (2D) perovskites exhibit tunable optical and electronic properties via chemical composition.
• Previous efforts achieved high color-purity emitters by altering halide composition.
• Synthesizing single-phase, specific n-layer 2D perovskites remains challenging due to rapid nanoparticle nucleation.

Purpose of the Study:

• To develop a facile and effective method for synthesizing single-phase 2D perovskite nanoplates with a designated number of layers (n).
• To enable precise control over the layer number in both lead- and tin-based 2D perovskites.
• To investigate the impact of layer number on photoluminescence properties and photostability.

Main Methods:

• Utilized kinetic control during synthesis to favor the formation of specific n-layer 2D perovskites.
• Incorporated carboxylic acid additives into the reaction medium.
• Promoted the selective formation of multilayer 2D perovskites (kinetic product) over single-layer perovskites (thermodynamic product).

Main Results:

• Successfully synthesized single-phase 2D perovskite nanoplates with a designated n number for both lead- and tin-based materials.
• Demonstrated that decreasing octahedral layers per inorganic sheet increases photoluminescence energy.
• Observed an enhanced radiative decay rate and significantly improved photostability with decreasing layer number.

Conclusions:

• The developed kinetic control strategy offers an effective route to precisely engineer n-layer 2D perovskites.
• Tailoring the layer number in 2D perovskites provides a powerful tool for optimizing their optoelectronic performance and stability.
• This work paves the way for advanced applications of 2D perovskites in optoelectronics and photonics.