Full-Spectrum Persistent Luminescence Tuning Using All-Inorganic Perovskite Quantum Dots

Area of Science:

• Materials Science
• Optoelectronics
• Quantum Dot Technology

Background:

• Persistent luminescence materials are crucial for night vision and dark-light applications.
• Controlling the emission profiles of traditional phosphors remains a significant challenge.
• All-inorganic perovskite quantum dots (PeQDs) offer unique optoelectronic properties.

Purpose of the Study:

• To develop a novel strategy for fine-tuning persistent luminescence.
• To utilize PeQDs as efficient light-conversion materials for tunable emission.
• To overcome the limitations of conventional afterglow phosphors.

Main Methods:

• Employing all-inorganic CsPbX3 (X=Cl, Br, I) perovskite quantum dots (PeQDs).
• Tailoring the band gap of PeQDs to control emission wavelengths.
• Investigating the light-conversion properties and afterglow decay characteristics.

Main Results:

• Achieved full-spectrum persistent luminescence covering the entire visible region.
• Demonstrated narrow bandwidth emission characteristic of PeQDs.
• Observed highly synchronized afterglow decay due to a single energy storage source.
• Successfully tuned persistent luminescence by adjusting the PeQD band gap.

Conclusions:

• The use of PeQDs provides a unique strategy for precise control over persistent luminescence.
• This approach overcomes limitations associated with traditional afterglow phosphors.
• Opens new avenues for applications in white-emitting persistent light sources and multicolor displays.