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On-Demand Control of Lanthanide Optical Dynamics via Pumping-Flux Modulation.

Dan Guo¹, Xuewen Pang¹, Chang Liu²

¹Department of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China.

|June 6, 2025

Summary

This summary is machine-generated.

Researchers developed a new method to control lanthanide luminescence decay using pumping-flux modulation. This technique allows for real-time, reversible tuning of luminescence lifetimes in nanocrystals for advanced nanophotonic applications.

Keywords:

cross-relaxation lanthanide luminescence dynamics pumping-flux modulation upconversion

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Area of Science:

Nanophotonics
Materials Science
Quantum Optics

Background:

Precise control of lanthanide luminescence decay is crucial for advanced nanophotonic applications.
Current methods rely on static material modifications, limiting dynamic control.
Lanthanide ions are key components in various photonic devices due to their unique emission properties.

Purpose of the Study:

To introduce a novel pumping-flux modulation strategy for reversible, on-demand tuning of lanthanide luminescence lifetimes.
To demonstrate dynamic control over cross-relaxation processes in lanthanide-doped nanocrystals.
To explore the potential of this method for applications like optical encryption and adaptive displays.

Main Methods:

Utilized highly Er³⁺-doped nanocrystals.
Implemented a pumping-flux modulation strategy by adjusting excitation pulse duration and intensity.
Investigated the influence of excitation profiles on energy state populations and cross-relaxation pathways.
Demonstrated dynamically programmable lifetime mapping.

Main Results:

Achieved over 10-fold tuning in green and near-infrared luminescence lifetimes.
Demonstrated reversible, on-demand control of emission kinetics.
Mechanistic studies revealed modulation of cross-relaxation pathways via excitation profile adjustments.
Successfully implemented dynamic lifetime mapping for optical encryption.

Conclusions:

The pumping-flux modulation strategy offers a fundamentally new route for real-time control of lanthanide emission.
This approach eliminates the need for complex materials engineering for dynamic luminescence tuning.
The findings have broad implications for adaptive displays, reconfigurable photonics, and time-domain optical security.