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Near-infrared luminescent material as well as preparation method and application thereof

A light-emitting material and near-infrared technology, applied in the field of fluorescent materials, can solve problems such as poor chemical stability, fluorescence heat quenching, and low luminous efficiency, and achieve the effects of low cost, easy operation, and simple and feasible methods

Active Publication Date: 2022-06-21
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the near-infrared luminescent materials in the above-mentioned literatures have various problems, such as low luminous efficiency, severe fluorescence thermal quenching, or poor chemical stability, etc.

Method used

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  • Near-infrared luminescent material as well as preparation method and application thereof
  • Near-infrared luminescent material as well as preparation method and application thereof
  • Near-infrared luminescent material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] This embodiment provides a near-infrared light-emitting material, and the chemical formula of the near-infrared light-emitting material is K 0.97 Ga 10.95 Cr 0.05 Yb 0.03 O 17 .

[0061] The preparation of the near-infrared light-emitting material is as follows:

[0062] (1) weighing potassium carbonate, gallium oxide, chromium oxide and ytterbium oxide in a stoichiometric ratio of K:Ga:Cr:Yb=1.94:10.95:0.05:0.03 in a molar ratio, grinding and mixing to obtain a mixture;

[0063] (2) Put the mixture obtained in step (1) into an alumina crucible, calcinate at 1500° C. for 4 hours, take out when cooled to room temperature, and grind and disperse to obtain near-infrared light-emitting material K 0.97 Ga 10.95 Cr 0.05 Yb 0.03 O 17 .

[0064] figure 1 The XRD pattern of the near-infrared light-emitting material obtained in Example 1 is shown. It can be seen from the figure that the spectrum is similar to that of KGa. 11 O 17 Consistent with the proof that succes...

Embodiment 2

[0068] This embodiment provides a near-infrared light-emitting material, and the chemical formula of the near-infrared light-emitting material is K 0.98 Al 10.87 Cr 0.13 Yb 0.02 O 17 .

[0069] The preparation of the near-infrared light-emitting material is as follows:

[0070] (1) weighing potassium carbonate, aluminum oxide, chromium oxide and ytterbium oxide with a stoichiometric ratio of K:Al:Cr:Yb=1.96:10.87:0.13:0.02, grinding and mixing to obtain a mixture;

[0071] (2) Put the mixture obtained in step (1) into an alumina crucible, calcinate at 1500° C. for 8 hours, take out when cooled to room temperature, grind and disperse to obtain near-infrared light-emitting material K 0.98 Al 10.87 Cr 0.13 Yb 0.02 O 17 .

[0072] Figure 4 The luminescence spectrum of the near-infrared light-emitting material obtained in Example 2 shows the photoluminescence emission of the near-infrared light-emitting material under the excitation condition of 420 nm blue light, and t...

Embodiment 3

[0076] This embodiment provides a near-infrared light-emitting material, and the chemical formula of the near-infrared light-emitting material is Li 0.97 Ga 10.95 Cr 0.05 Yb 0.03 O 17 .

[0077] The preparation of the near-infrared light-emitting material is as follows:

[0078] (1) Weigh lithium carbonate, gallium oxide, chromium oxide and ytterbium oxide in a stoichiometric ratio of Li:Ga:Cr:Yb=1.94:10.95:0.05:0.03 in molar ratio, and grind and mix to obtain a mixture;

[0079] (2) Put the mixture obtained in step (1) into an alumina crucible, calcinate at 1500° C. for 6 hours, take out when cooled to room temperature, grind and disperse to obtain a near-infrared light-emitting material Li 0.97 Ga 10.95 Cr 0.05 Yb 0.03 O 17 .

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Abstract

The invention provides a near-infrared luminescent material as well as a preparation method and application thereof. The chemical formula of the near-infrared luminescent material is A < 1-y > B < 11-x > Cr < x > Y < by > O < 17 >, A in the chemical formula comprises an alkali metal element, and B in the chemical formula comprises Ga and / or Al; 0.01 < = x < = 0.16, and 0.01 < = y < = 0.06. The Cr and Yb co-doped near-infrared luminescent material has a very wide excitation spectrum, can generate visible light and near-infrared light matched with the forbidden band width of silicon, can convert weakly absorbed near-ultraviolet light into strongly absorbed near-infrared light when being applied to a silicon-based solar cell, and improves the photoelectric conversion efficiency of the silicon-based solar cell.

Description

technical field [0001] The invention belongs to the technical field of fluorescent materials, and relates to a near-infrared luminescent material and a preparation method and application thereof. Background technique [0002] With the increasingly serious energy shortage and environmental pollution, the development and utilization of sustainable clean energy is imminent. Solar energy is an inexhaustible green energy. Therefore, related technologies for capturing sunlight and converting it into electrical energy using solar cell devices have been developed. So far, many solar cell technologies have been developed, among which crystalline silicon solar cells, which are the first generation of solar energy converters, still dominate the market due to their low cost and simple fabrication process. However, due to the spectral mismatch between the incident solar photon energy and the energy gap of crystalline silicon solar cells, its photoelectric conversion efficiency is still...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62C09K11/64H01L31/042
CPCC09K11/7708H01L31/042Y02E10/50
Inventor 尤洪鹏王子阳沈斯达
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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