Near-Infrared Quantum Cutting Long Persistent Luminescence.

Area of Science:

• Materials Science
• Luminescence
• Quantum Cutting

Background:

• Quantum cutting (QC) and long persistent luminescence (LPL) are distinct phenomena.
• Combining QC and LPL offers potential for novel optoelectronic applications.

Purpose of the Study:

• To introduce a new concept: near-infrared quantum cutting long persistent luminescence (NQPL).
• To achieve theoretical high efficiency (>100%) in near-infrared LPL.
• To explore potential applications in solar cells and bio-medical imaging.

Main Methods:

• Designing the NQPL concept by integrating QC and LPL principles.
• Synthesizing the first NQPL phosphor: Ca2Ga2GeO7:Pr(3+), Yb(3+).
• Investigating energy transfer mechanisms within the phosphor.

Main Results:

• Demonstrated the feasibility of NQPL by fabricating Ca2Ga2GeO7:Pr(3+), Yb(3+).
• Observed both two-step (model I) and one-step (model IV) energy transfer at Pr(3+) (3)P0 levels.
• Achieved theoretical high efficiency for near-infrared LPL.

Conclusions:

• The NQPL concept enables highly efficient near-infrared long persistent luminescence.
• The synthesized phosphor shows promising energy transfer dynamics.
• NQPL materials hold significant potential for advanced applications like crystalline Si solar cells and bio-medical imaging.