Improving persistent luminescence in pressure-tuned CsPbBr₃ nanocrystals by Ce³⁺ doping

Area of Science:

• Materials Science
• Solid-State Physics
• Quantum Dot Technology

Background:

• All-inorganic perovskite quantum dots (e.g., CsPbBr₃) are promising for optical devices.
• High pressure can negatively impact the photoluminescence properties of quantum dots.
• Understanding pressure effects is crucial for device reliability.

Purpose of the Study:

• To investigate the pressure-dependent photoluminescence kinetics of CsPbBr₃ quantum dots.
• To explore the effect of Ce³⁺ doping on the high-pressure luminescence of CsPbBr₃ quantum dots.
• To develop a strategy for enhancing the persistent luminescence of perovskite quantum dots under pressure.

Main Methods:

• Steady-state and time-resolved photoluminescence spectroscopy were employed.
• The study analyzed CsPbBr₃ and Ce³⁺-doped CsPbBr₃ quantum dots.
• Measurements were conducted under varying high-pressure conditions.

Main Results:

• Ce³⁺ doping significantly improved the persistent luminescence of CsPbBr₃ quantum dots under high pressure.
• Doped quantum dots exhibited slower decreases in peak intensity and energy with increasing pressure (0.08 a.u. GPa^-1 and 0.012 eV GPa^-1 reduction).
• Time-resolved photoluminescence revealed that Ce³⁺ doping shortened quantum dot lifetimes under pressure, unlike undoped counterparts.

Conclusions:

• Ce³⁺ doping offers a novel strategy to enhance the high-pressure stability of CsPbBr₃ quantum dot luminescence.
• The doping effectively modulates photoluminescence kinetics, improving performance under mechanical stress.
• These findings pave the way for robust all-inorganic perovskite optical devices operating under demanding conditions.