Layered Double Hydroxide Nanosheets Boosting Red Long Afterglow via Highly Efficient Energy Transfer

Area of Science:

• Materials Science
• Photochemistry
• Nanotechnology

Background:

• Room-temperature phosphorescent (RTP) materials offer diverse applications but red long-afterglow fabrication remains challenging.
• Efficient RTP and long luminescence lifetime are often inversely related, hindering red emission development.

Purpose of the Study:

• To engineer novel red long-afterglow materials with high efficiency and extended lifetime.
• To explore the potential of layered double hydroxide (LDHs) nanosheets for red luminescence applications.

Main Methods:

• Synthesized layered double hydroxide (LDHs) nanosheets doped with rhodamine B (RhB).
• Utilized triplet-triplet energy transfer from green phosphorescent LDHs to RhB for red emission.
• Characterized the photophysical properties, including quantum yield and luminescence lifetime.

Main Results:

• Achieved red long-afterglow with quantum yield up to 42.35% and lifetime up to 256.77 ms.
• Demonstrated high triplet-triplet energy transfer efficiency (95.18%) in Zn-based LDHs@RhB composites.
• Observed red long-afterglow excitation under white-light irradiation.

Conclusions:

• Successfully fabricated efficient red long-afterglow LDHs@RhB composites.
• The developed materials show significant potential for anticounterfeiting and information encryption due to time-resolved afterglow properties.