Core-shell structure up-conversion nano material and preparation method thereof

A nanomaterial, core-shell structure technology, applied in the field of red light-emitting core-shell structure up-conversion nanomaterials and their preparation, can solve problems such as concentration quenching, and achieve the effects of low equipment cost, easy operation, and short preparation period
CN112724978AActive Publication Date: 2021-04-30GUANGZHOU UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU UNIVERSITY
Publication Date
2021-04-30

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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to a red-light-emitting core-shell structure up-conversion nano material and a preparation method thereof. According to the up-conversion nano material, NaHoF4 serves as a core layer, and is sequentially coated with a NaGdF4:Tb shell layer, a NaGdF4:Yb,Tm shell layer and a NaYF4 passivation layer, excitation energy is transmitted to the core layer from the second shell layer by sequentially utilizing energy migration between Gd<3+>:<6>P7 / 2 energy levels, energy migration between Tb<3+>:<5>D4 energy levels and interface energy transmission of Tb<3+>:<5>D4 energy levels to Ho<3+>:<5>S2 / <5>F4 energy levels, and a cross relaxation effect (<5>S2 / <5>F4+<5>I7-><5>F5+<5>I6) between Ho<3+> ions is caused so as to finally obtain NaHoF4-base up-conversion red light emission. The up-conversion nano material is simple in preparation process, short in period, low in equipment cost, simple to operate and suitable for mass production.
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Description

technical field

[0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a core-shell structure up-conversion nano material emitting red light and a preparation method thereof. Background technique

[0002] Photon upconversion refers to the anti-Stokes process that converts two or more low-energy photons into a single high-energy photon. Rare earth-doped upconversion nanomaterials have the advantages of high photochemical stability, long fluorescence lifetime, and low toxicity, and have great application prospects in the fields of biological imaging, optical temperature sensors, anti-counterfeiting, and 3D displays. Compared with the short-wavelength blue light and green light, the longer-wavelength red light (600-700nm) is known as the "biological window of visible light" because of its deeper penetration into biological tissues. As we all know, NaHoF 4 Based on upconversion nanomaterials have excellent performance in biom...

Claims

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