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Engineering Full-Spectrum Upconversion Through Coherent Energy Recycling in NaYF4:Yb,Tm/Cs4PbBr6 Heterostructure.

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Lanthanide-doped upconversion nanoparticles (UCNPs) combined with lead-halide perovskites (LHPs) enable tunable light emission. This study reveals LHPs actively participate in energy transfer, enhancing upconversion efficiency for novel photonic applications.

Keywords:
Energy transferHeterostructuresThermodynamics‐controlled growthUpconversion emission

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Hybrid heterostructures of lanthanide-doped upconversion nanoparticles (UCNPs) and lead-halide perovskites (LHPs) show promise for advanced luminescence and photon conversion.
  • Challenges include synthesizing well-defined UCNP/LHP structures due to perovskite crystallization and understanding energy transfer mechanisms.

Purpose of the Study:

  • To develop a controllable synthesis method for high-quality UCNP/LHP heterostructures.
  • To elucidate the role of LHPs in modulating upconversion processes.

Main Methods:

  • A thermodynamics-controlled epitaxial growth strategy was employed.
  • Fabrication of NaYF4:Yb,Tm/Cs4PbBr6 heterostructures with tunable architectures (core/shell to UCNP-in-LHP solids).

Main Results:

  • High-quality NaYF4:Yb,Tm/Cs4PbBr6 heterostructures were successfully synthesized.
  • The Cs4PbBr6 layer was shown to actively participate in energy transfer, facilitating back energy transfer to Tm3+ and enabling coherent energy recycling.
  • Broadly tunable upconversion emission across the visible spectrum was achieved.

Conclusions:

  • A robust method for fabricating high-quality UCNP/LHP heterostructures was established.
  • Lead-halide perovskites function as active components in engineering upconversion pathways, not just passive acceptors.