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Amplifying Upconversion by Engineering Interfacial Density of State in Sub-10 nm Colloidal Core/Shell Fluoride
Lei Lei1, Enyang Liu1, Yubin Wang1
1Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou 310018, P. R. China.
Nano Letters
|December 1, 2021
Summary
Researchers enhanced photon upconversion in small nanoparticles by engineering the interface between core and shell layers. This breakthrough boosts luminescence intensity significantly, opening doors for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photonics
Background:
- Bright photon upconversion is crucial for applications like photovoltaics and biophotonics.
- Intensifying upconversion luminescence in small, simple nanoparticles remains a significant challenge.
Purpose of the Study:
- To amplify photon upconversion in sub-10 nm colloidal rare-earth ions doped fluoride nanocrystals.
- To engineer the interfacial density of states between core and shell layers for luminescence enhancement.
Main Methods:
- Utilized core/shell nanocrystal structures with rare-earth ions.
- Tuned metal cations in the shell layer of alkaline-earth-based core/shell nanoparticles.
- Investigated the effect of interfacial phonon frequency and density of states on upconversion luminescence.
Main Results:
- Demonstrated significant amplification of photon upconversion.
- Achieved luminescence intensification of up to 8224 times by decreasing interfacial phonon frequency and density of states.
- Verified the enhancement strategy's generality in alkali-based core/shell nanoparticles.
Conclusions:
- Engineering interfacial density of states is an effective strategy for amplifying photon upconversion.
- This approach enables applications in dynamic display and high-level security information storage.
- Developed a method for creating highly efficient upconversion nanoparticles.
