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Nanometer photon avalanche fluorescence principle with nonlinear response cascade amplification effect and implementation method

A nonlinear response, cascade amplification technology, applied in the fields of nonlinear optics and nanophotonics, can solve the problems of low efficiency, hindering the popularization and application of photon avalanche effect, and difficulty in photon avalanche fluorescence emission.

Pending Publication Date: 2021-11-05
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the reported photon avalanche phenomena are observed in bulk materials or bulk materials, and it is very difficult to realize photon avalanche fluorescence emission at the nanoscale.
What's more, currently all photon avalanche effects can only be found in Pr 3+ 、Nd 3+ 、Tm 3+ 、Er 3+ 、Ho 3+ If it is necessary to realize the photon avalanche fluorescence of different ions, a variety of complicated mechanisms are required, and the efficiency is low, which hinders the popularization and application of the photon avalanche effect in the field of nonlinear optics.

Method used

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  • Nanometer photon avalanche fluorescence principle with nonlinear response cascade amplification effect and implementation method
  • Nanometer photon avalanche fluorescence principle with nonlinear response cascade amplification effect and implementation method
  • Nanometer photon avalanche fluorescence principle with nonlinear response cascade amplification effect and implementation method

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Embodiment 1

[0040] This embodiment provides a Tm 3+ A realization method of rare earth doped fluorescent nanomaterials with cascading amplified photon avalanche effect for cascading ions. The multi-layer core-shell structure up-conversion nanoparticle constructed in this embodiment, the core of the nanoparticle is a photonic avalanche engine, and the water storage ion Yb 3+ with avalanche ion Pr 3+ Co-doped in NaYF 4 nanocrystals, Yb 3+ Doping concentration is around 15%, Pr 3+ The doping concentration is about 0.5%, and the inner shell is composed of water storage ions Yb 3+ with cascade ion Tm 3+ Co-doped in NaYF 4 Nanocrystal composition, Yb 3+ The doping concentration is around 3%, Tm 3+ The doping concentration is about 4%, and the shell layer is inert NaYF 4 nanocrystals.

[0041] Excited with a continuous beam of near-infrared excitation light, the photon energy of this wavelength does not exactly match the Pr 3+ From 3 h 4 arrive 1 G 4 ground state absorption of , b...

Embodiment 2

[0044] This embodiment provides a HO 3+ or Er 3+ A realization method of rare earth doped fluorescent nanomaterials with cascading amplified photon avalanche effect for cascading ions. The multi-layer core-shell structure up-conversion nanoparticle constructed in this embodiment, the core of the nanoparticle is a photonic avalanche engine, and the water storage ion Yb 3+ with avalanche ion Pr 3+ Co-doped in NaYF 4 nanocrystals, Yb 3+ Doping concentration is around 15%, Pr 3+ The doping concentration is about 0.5%, and the inner shell is composed of water storage ions Yb 3+ with cascade ion Tm 3+ Co-doped in NaYF 4 Nanocrystal composition, Yb 3+ The doping concentration is around 3%, HO 3+ or Er 3+ The doping concentration is about 4%, and the shell layer is inert NaYF 4 nanocrystals.

[0045] Similar to Example 1, a beam of continuous near-infrared excitation light is used for excitation. After the power reaches a certain threshold, the nonlinear effect begins to i...

Embodiment 3

[0047] This embodiment provides a Eu 3+ or Tb 3+ A realization method of rare earth doped fluorescent nanomaterials with cascading amplified photon avalanche effect for cascading ions. The multi-layer core-shell structure up-conversion nanoparticle constructed in this embodiment, the core of the nanoparticle is a photonic avalanche engine, and the water storage ion Yb 3+ with avalanche ion Pr 3+ Co-doped in NaYF 4 nanocrystals, Yb 3+ Doping concentration is around 15%, Pr 3+ The doping concentration is about 0.5%, and the inner shell is composed of avalanche ions Pr 3+ with cascaded ions Eu 3+ or Tb 3+ Co-doped in NaYF 4 Nanocrystal composition, Pr 3+ Doping concentration is about 3%, Eu 3+ or Tb 3+ The doping concentration is about 4%, and the shell layer is inert NaYF 4 nanocrystals.

[0048] Similar to Example 1, a beam of continuous near-infrared excitation light is used for excitation. After the power reaches a certain threshold, the nonlinear effect begins t...

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Abstract

The invention discloses a nano photon avalanche fluorescence principle with a nonlinear response cascade amplification effect and an implementation method, photon avalanche with the cascade amplification effect is realized by combined action of a photon avalanche nano engine and cascade ions, and the photon avalanche nano engine is composed of nanocrystals co-doped with avalanche ions and water storage ions. The two kinds of ions can radiate efficient and stable photon avalanche fluorescence, cascade ions are doped in a shell layer wrapping the nanometer engine, and photon avalanche energy in the engine can be transmitted to the cascade ions through a lattice energy migration path. The rare earth doped fluorescent nano material generates a high-order nonlinear photon avalanche effect with a cascade amplification effect, so that multi-ion photon avalanche fluorescent radiation in a nano system is realized by using the same excitation strategy.

Description

technical field [0001] The invention belongs to the field of nonlinear optics and nanophotonics, and specifically relates to a nanophoton avalanche fluorescence principle and a realization method with nonlinear response cascade amplification effect. [0002] technical background [0003] The nonlinear multi-photon effect means that when a nonlinear optical material is excited by incident light with a high photon density, the molecules / atoms in the ground state absorb multiple photons at the same time and then transition to an excited state, then transition to a sub-excited state through a relaxation process, and finally Spontaneous emission returns to the ground state, releasing fluorescent photons with energy slightly less than the sum of the absorbed photon energies. Since Denk et al. developed the first two-photon laser scanning microscope in 1990, multiphoton imaging has been widely used in the medical field due to its low invasiveness, high penetration, strong spatial sl...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/64G01N2021/6417
Inventor 詹求强梁宇森朱志旻乔书倩郭鑫王保举
Owner SOUTH CHINA NORMAL UNIVERSITY