Ultralong lifetime and efficient room temperature phosphorescent carbon dots through multi-confinement structure...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Room temperature phosphorescence (RTP) materials are crucial for optical applications.
• Achieving both long phosphorescence lifetime and high quantum efficiency simultaneously remains a challenge.

Purpose of the Study:

• To design and fabricate multi-confined carbon dots for RTP.
• To overcome limitations in achieving long lifetime and high efficiency in RTP materials.

Main Methods:

• Fabrication of multi-confined carbon dots using a rigid network, covalent bonding, and 3D spatial restriction.
• Characterization of phosphorescence properties, including lifetime and quantum efficiency.
• Assessment of material stability under various chemical conditions.

Main Results:

• The multi-confined carbon dots exhibit an ultralong phosphorescence lifetime of 5.72 seconds.
• Achieved a high phosphorescence quantum efficiency of 26.36%.
• Demonstrated exceptional stability against oxidants, acids, bases, and polar solvents.

Conclusions:

• Multi-confinement strategy effectively rigidifies triplet excited states, preventing non-radiative decay.
• The developed carbon dots offer a universal strategy for metal-free RTP materials.
• These materials show promise for applications requiring high stability, especially under harsh conditions.