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Dual Aliovalent Dopants Cu, Mn Engineered Eco-Friendly QDs for Ultra-Stable Anti-Counterfeiting
S Kokilavani1, Gurpreet Singh Selopal2, Lei Jin1
1Centre for Energy, Materials and Telecommunications, Institut national de la recherche scientifique, 1650 Boul. Lionel-Boulet, Varennes, QC, J3X 1P7, Canada.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 6, 2024
Summary
Eco-friendly semiconductor quantum dots (QDs) were engineered with copper and manganese doping for enhanced optical properties. These doped QDs show promise for advanced anti-counterfeiting and information encryption technologies due to their stability and luminescence.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Semiconductor quantum dots (QDs) offer tunable optical and electronic properties.
- Doping QDs with optically active elements can further enhance their functionalities.
- Eco-friendly QD materials are crucial for sustainable technological applications.
Purpose of the Study:
- To synergistically modulate the optical properties of eco-friendly ZnInSe2/ZnSe core/shell quantum dots.
- To investigate the potential of Cu-doped and Mn-alloyed QDs for anti-counterfeiting and information encryption.
- To enhance the photoluminescence (PL) emission and stability of QDs through dopant engineering.
Main Methods:
- Incorporation of Cu-doping into the core and Mn-alloying into the shell of ZnInSe2/ZnSe core/shell QDs.
- Characterization of optical properties, including photoluminescence (PL) emission spectra and lifetime.
- Integration of engineered QDs into poly(methyl methacrylate) (PMMA) to create luminescent inks for pattern printing.
Main Results:
- Engineered "Cu:ZnInSe2/Mn:ZnSe" core/shell QDs exhibited intense orange PL emission (606 nm) with improved color purity.
- Achieved an extended average PL lifetime of 201 ns, suitable for complex encryption.
- Demonstrated excellent thermal stability (retaining 70% PL intensity at 170°C) and water resistance (persisting after 10 weeks of soaking).
Conclusions:
- Synergistic Cu-doping and Mn-alloying effectively enhance the optical properties and stability of eco-friendly QDs.
- The engineered QDs are suitable for creating robust, concealed luminescent inks for anti-counterfeiting applications.
- This dopant engineering approach provides a pathway for developing advanced fluorescence-based security features.
