A rare earth/quantum dot composite up-conversion luminescent material and its preparation method and application

A technology of rare earth upconversion and luminescent materials, applied in luminescent materials, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the overall quenching of upconversion luminescence and the invisible upconversion luminescence of quantum dots and other problems, to achieve the effect of breaking through low conversion efficiency, easy large-scale preparation, and easy promotion

Active Publication Date: 2021-09-21
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the previous FRET based on UCNPs to QDs is often only the overall quenching of upconversion luminescence, while the upconversion luminescence of quantum dots is almost invisible.

Method used

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  • A rare earth/quantum dot composite up-conversion luminescent material and its preparation method and application
  • A rare earth/quantum dot composite up-conversion luminescent material and its preparation method and application
  • A rare earth/quantum dot composite up-conversion luminescent material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1: LiYbF 4 :0.5%Tm 3+ @LiYF 4 / CsPbX 3 Preparation of (X=Cl, Br, I) Composite Upconversion Luminescent Material and Its Upconversion Luminescence Properties

[0069] The LiYbF 4 :0.5%Tm 3+ @LiYF 4 It can be prepared by the method disclosed in the Chinese invention patent application with application number 201710204060.9. 50 μmol oil-soluble LiYbF 4 :0.5%Tm 3+ @LiYF 4 Core-shell upconversion nanocrystals and 50 μmol oil-soluble CsPbX 3 Perovskite quantum dots are dispersed in 5mL cyclohexane to obtain LiYbF 4 :0.5%Tm 3+ @LiYF 4 Nanocrystalline / CsPbX 3 Perovskite quantum dot composite up-conversion luminescent material. Tailoring of CsPbX by compositional regulation of halogen X 3 The band gap and emission spectrum of perovskite quantum dots can obtain composite up-conversion luminescent materials with different emission wavelengths, and its emission spectrum can be continuously adjusted in the range of 340-750nm.

[0070] wxya 4 :0.5%Tm 3+ @LiY...

Embodiment 2

[0071] Example 2: LiYbF 4 :0.5%Tm 3+ / CsPbBr 3 Preparation of Composite Upconversion Luminescent Material and Its Upconversion Luminescence Properties

[0072] The LiYbF 4 :0.5%Tm 3+ It can be prepared by the method disclosed in the Chinese invention patent application with application number 201710204060.9. 20mg oil-soluble LiYbF 4 :0.5%Tm 3+ Up-converting nanocrystals and oil-soluble CsPbBr at different concentrations (0.2-20mg) 3 Perovskite quantum dots are dispersed in 10mL cyclohexane to obtain LiYbF 4 :0.5%Tm 3+ Nanocrystalline / CsPbBr 3 Perovskite quantum dot composite up-conversion luminescent material. By changing CsPbBr 3 The concentration of perovskite quantum dots can regulate the upconversion luminescence.

[0073] 980nm semiconductor laser (50W / cm 2 ) under the excitation of the upconversion fluorescence emission spectrum ( Figure 6 ) shows that with CsPbBr 3 With increasing concentration of perovskite quantum dots, the Tm in the composite 3+ The ...

Embodiment 3

[0074] Example 3: LiYbF 4 :1%Tm 3+ / CsPbCl 1.5 Br 1.5 Preparation of Composite Upconversion Luminescent Material and Its Upconversion Luminescence Properties

[0075] The LiYbF 4 :1%Tm 3+ It can be prepared by the method disclosed in the Chinese invention patent application with application number 201710204060.9. 10 mg oil-soluble LiYbF 4 :1%Tm 3+ Up-conversion nanocrystals and different molar amounts (5-10 mg) of oil-soluble CsPbCl 1.5 Br 1.5 Perovskite quantum dots are dispersed in 5mL cyclohexane to obtain LiYbF 4 :1%Tm 3+ Nanocrystalline / CsPbCl 1.5 Br 1.5 Perovskite quantum dot composite up-conversion luminescent material. By changing the CsPbCl 1.5 Br 1.5 The molar weight of perovskite quantum dots can regulate their upconversion luminescence.

[0076] 980nm semiconductor laser (100W / cm 2 ) under the excitation of the upconversion fluorescence emission spectrum ( Figure 9 a) shows that with CsPbCl 1.5 Br 1.5 With increasing concentration of perovskite...

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Abstract

The invention relates to a rare earth / quantum dot composite up-conversion luminescent material and its preparation method and application. The composite material is composed of rare earth up-conversion luminescent material and quantum dots. The composite material of the invention is simple to prepare, and only needs to directly mix the rare earth up-conversion luminescent material and the quantum dot. By adjusting the types and ratios of rare earth upconversion luminescent materials and quantum dots, the composite material can realize high-efficiency upconversion luminescence in the entire visible spectrum. The composite material of the invention not only overcomes the limitation of traditional rare earth upconversion luminescence that the upconversion spectrum cannot be continuously adjusted due to the discrete energy levels of rare earth ions, but also solves the problem of low upconversion efficiency of quantum dots through multiphoton absorption. The invention can fine-tune the up-conversion spectrum and fluorescence lifetime of the material, and the composite material can be applied to the fields of biological detection, biological imaging, laser, optical coding, anti-counterfeiting, three-dimensional display, photoelectric detector, solar spectrum conversion and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a rare earth / quantum dot composite up-conversion luminescent material and its preparation method and application. Background technique [0002] Upconversion luminescence is a nonlinear optical process capable of converting two or more low-energy photons into one high-energy photon. Compared with the down-transfer luminescence excited by traditional ultraviolet or visible light, the up-conversion luminescence is generally excited by near-infrared laser, so it has a series of high light penetration depth, high spatial resolution, no background fluorescence interference, and less damage to the sample. advantage. These advantages make up-conversion luminescent materials have broad application prospects in the fields of high-sensitivity biological detection, super-resolution biological imaging, laser, optical coding, multiple anti-counterfeiting, three-dimen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/85C09K11/88H01L33/50B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/7773C09K11/883H01L33/502
Inventor 郑伟陈学元黄萍涂大涛李仁富徐金
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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