A single-doped-enriched core-shell structure up-conversion luminescent material and its preparation method

A technology of core-shell structure and luminescent materials, which is applied in the direction of luminescent materials, chemical instruments and methods, nanotechnology, etc., can solve the problems of no significant improvement, difficulty in meeting the harsh requirements of industrial production, instruments and equipment, etc., and achieve high-efficiency luminescence Effect
CN108384547BActive Publication Date: 2020-05-19HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2020-05-19

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Abstract

The invention discloses a mono-doped-enriched core-shell structure up-conversion luminescent material and a preparation method thereof. A chemical expression formula of the material is NaLnF4:A3+@NaYbF4@NaLnF4. The preparation method includes following steps: step 1, synthesizing a NaLnF4:A3+ core nanomaterial; step 2, epitaxially growing a NaYbF4 layer around the NaLnF4:A3+ core nanomaterial to obain a NaLnF4:A+@NaYbF4 core-shell nanomaterial; step 3, epitaxially growing a NaLnF4 layer around the NaLnF4:A3+@NaYbF4 core-shell nanomaterial to obtain NaLnF4:A3+@NaYbF4@NaLnF4. The NaLnF4:A3+@NaYbF4@NaLnF4 core-shell structure can effectively solve the problem of co-doping concentration limitation of intracell energy transfer, can effectively realize efficient light emitting of the up-conversion luminescent material, is found conducive to luminescence of three-photo transition emission especially under a Yb-enriched sensitized shell layer and realizes two-magnitude-order enhancement of 407nm wavelength.
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Description

technical field

[0001] The invention belongs to the field of preparation of up-conversion luminescent materials, and more specifically relates to a single doping-enrichment core-shell structure up-conversion luminescent material based on energy transfer and a preparation method thereof. Background technique

[0002] In recent years, rare earth up-conversion luminescent materials have broad application prospects in various fields such as lighting, display, photoelectric conversion of solar cells, and bioluminescent imaging due to their excellent fluorescence properties. research hotspot. At present, the known high-efficiency upconversion luminescence processes can be roughly divided into three types: excited state absorption, energy transfer upconversion and photon avalanche. Among them, the energy transfer upconversion by combining sensitized ions and activated ions has been widely studied due to its high energy conversion efficiency and low power excitation performance. H...

Claims

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