Alleviating Luminescence Concentration Quenching in Upconversion Nanoparticles through Organic Dye Sensitization

Area of Science:

• Materials Science
• Nanotechnology
• Photonics

Background:

• Luminescence concentration quenching limits brightness in lanthanide materials.
• Optimizing emitter concentration is crucial for applications like bioimaging and solar cells.

Purpose of the Study:

• To introduce and validate a strategy to alleviate luminescence concentration quenching.
• To enhance the upconversion brightness of neodymium (Nd3+) emitters.

Main Methods:

• Anchoring an organic dye (indocyanine green, ICG) onto NaYF4:Nd upconverting nanoparticles.
• Experimental and theoretical analysis of energy transfer and luminescence properties.
• Investigating the effect of ICG on Nd3+ doping concentration and brightness.

Main Results:

• Optimal Nd3+ doping concentration increased from 2% to 20% with ICG.
• Achieved approximately 10 times higher upconversion brightness.
• Demonstrated efficient photon harvesting by ICG and energy transfer to Nd3+.

Conclusions:

• The energy harvesting strategy effectively overcomes concentration quenching.
• This approach significantly enhances brightness and can be applied to other lanthanide-doped nanomaterials.
• The method shows promise for improving bioimaging and solar cell applications.