Probing Photoluminescence in Perovskite-Based Polymer Nanocomposite Films.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite (PV) nanoparticles integrated into polymer nanocomposites are emerging materials for optoelectronic and photonic applications.
• Polydimethylsiloxane (PDMS) is a versatile polymer used in various advanced material applications.

Purpose of the Study:

• To investigate the photoluminescence (PL) properties of PV-based PDMS nanocomposite films.
• To understand the effect of PDMS on the optical limiting and PL decay dynamics of perovskite nanoparticles.

Main Methods:

• Steady-state and time-resolved photoluminescence (PL) spectroscopy were employed.
• PV-based PDMS nanocomposite films were fabricated and characterized.
• Excitation intensity-dependent PL measurements were conducted.

Main Results:

• Steady-state PL showed a linear increase with excitation intensity followed by saturation, indicating efficient electron-hole pair generation.
• Optical limiting effects were observed and found to be scalable with PV concentration.
• Time-resolved PL revealed that PDMS altered the decay mechanism from a 3-component to a 2-component process.
• The total PL decay timescale was significantly reduced from 16 ns for PV to approximately 6 ns in the PV-PDMS nanocomposite.

Conclusions:

• PV-PDMS nanocomposites exhibit promising optical limiting properties.
• The incorporation of PDMS significantly modifies the photoluminescence dynamics of perovskite nanoparticles, leading to faster decay times.
• These findings highlight the potential of PV-PDMS nanocomposites for advanced optoelectronic device applications.