Related Experiment Video
Updated: Jun 29, 2025
An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
Published on: August 30, 2017
Amplifying Photon Upconversion in Alloyed Nanoparticles for a Near-Infrared Photodetector
Long Yan1, Lili Tao2, Qizheng Zhang2
1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Engineering Technology Research Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510641, China.
Researchers developed novel alloyed nanoparticles for bright photon upconversion under low-power infrared light. This breakthrough enhances energy transfer, offering a 20-fold increase in upconversion quantum yield for potential near-infrared photodetector applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photonics
Background:
- Photon upconversion exhibits anti-Stokes emissions, attracting interest across various fields.
- Achieving intense upconversion emission under low-power laser irradiation remains a significant challenge.
Purpose of the Study:
- To design activator-sensitizer alloyed nanoparticles for bright upconversion under weak infrared irradiation.
- To enhance energy transfer efficiency through optimized sensitizer-activator separation.
Main Methods:
- Mechanistic design of activator-sensitizer alloyed nanoparticles.
- Investigation of energy transfer dynamics and upconversion enhancement.
- Characterization of emission color tunability with varying Yb3+ content and laser parameters.
Main Results:
- Remarkably enhanced upconversion (>2 orders of magnitude) under 0.26 W cm⁻² irradiation.
- A 20-fold increase in upconversion quantum yield compared to conventional methods.
- Dynamic control of emission color by modulating laser power and pulse widths.
Conclusions:
- The developed alloyed nanoparticles achieve bright upconversion under weak infrared light via efficient energy transfer.
- Tunable emission colors and enhanced quantum yield show significant promise.
- These nanoparticles are well-suited for applications in near-infrared photodetectors.
