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A core-multiple shell nanostructure enabling concurrent upconversion and quantum cutting for photon management.

Wei Shao1, Guanying Chen1, Tymish Y Ohulchanskyy2

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering & Key Laboratory of Micro-systems and Micro-structures, Ministry of Education, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China. chenguanying@hit.edu.cn and Institute for Lasers, Photonics, and Biophotonics and Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, USA. pnprasad@buffalo.edu.

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|January 19, 2017
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Summary
This summary is machine-generated.

Researchers developed a novel nanostructure enabling both photon upconversion and quantum cutting in a single unit. This breakthrough in photon management offers enhanced efficiency for various photonic applications, including advanced solar cells.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Photon management, including upconversion and quantum cutting, is crucial for efficient light utilization across a broad spectrum.
  • Simultaneously achieving both upconversion and quantum cutting in a single device has been a significant challenge, limiting applications like panchromatic photovoltaics.

Purpose of the Study:

  • To design and demonstrate a single nanostructure capable of concurrently performing both photon upconversion and quantum cutting.
  • To overcome the limitations of destructive interference and surface quenching in multifunctional nanostructures.

Main Methods:

  • Fabrication of an epitaxial fluoride nanostructure with an active core/inert shell/active shell/inert shell configuration.
  • Utilizing trivalent erbium (Er3+) ions in the core for infrared-to-visible upconversion.
  • Employing trivalent terbium (Tb3+) and trivalent ytterbium (Yb3+) ions in the outer shell for cooperative quantum cutting of excitation photons into near-infrared photons.

Main Results:

  • The nanostructure successfully implemented distinct upconversion and quantum cutting processes within isolated rare-earth-doped domains.
  • An upconversion quantum yield of approximately 1.6% was achieved.
  • A high luminescence yield of around 130% was recorded for the quantum cutting process.

Conclusions:

  • The developed core/multishell nanostructure effectively suppresses detrimental interference between upconversion and quantum cutting.
  • The design minimizes surface-related luminescence quenching, enhancing overall performance.
  • This work represents a significant advancement in flexible photon management within a single nanostructure, with broad implications for photonic technologies beyond photovoltaics.