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Light conversion phosphor powder and preparation method thereof

A phosphor, light conversion technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of narrow excitation wavelength band, high cost, low near-infrared emission intensity of light conversion phosphors, etc., to improve photoelectric conversion efficiency, production Low cost and low price effect

Active Publication Date: 2018-09-11
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a light-converting phosphor and a preparation method thereof, which are used to solve the problem of narrow excitation band, low near-infrared emission intensity and high cost of the light-converting phosphor in the prior art. The problem

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  • Light conversion phosphor powder and preparation method thereof
  • Light conversion phosphor powder and preparation method thereof
  • Light conversion phosphor powder and preparation method thereof

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preparation example Construction

[0045] The preparation method of light-conversion fluorescent powder of the present invention comprises the following steps:

[0046] Execute step S10, according to the general chemical formula M 3-y Ga 2-x GeO 8 :xCr 3+ , yRE 3+ The molar stoichiometric ratio in is to weigh the raw materials of each component respectively.

[0047] S20. Fully grind and mix the raw materials of the components weighed in step S10 evenly.

[0048] In a specific embodiment, the raw materials of the various components weighed are added to an agate mortar and ground for 30 minutes to make them mixed uniformly. It should be noted that as long as the above-mentioned method can be achieved, all suitable for the present invention.

[0049] S30, performing high-temperature sintering in an air atmosphere on the raw materials that have been thoroughly ground and mixed in step S20, and then cooled to room temperature.

[0050] In one embodiment, the fully ground and mixed raw materials are placed in...

Embodiment 1

[0058] Light Conversion Phosphor Zn 3 Ga 2 GeO 8 :0.3Cr 3+ , 0.01Yb 3+ Preparation: Weigh ZnO (analytical pure) 0.2458g, Yb 2 o 3 (Analytical pure) 0.002g, Cr 2 o 3 (Analytical pure) 0.023g, Ga 2 o 3 (Analytical pure) 0.1593g, GeO 2 (Analytical pure) 0.1046g. Mix the above raw materials evenly and put them into a mortar, add absolute ethanol for thorough grinding, put them into a corundum crucible, and then carry out high-temperature solid-phase synthesis in an air atmosphere. In this embodiment, the calcination temperature is set to 1400° C., and the calcination time is 6 hours. After the resistance furnace is cooled to room temperature, the sample is taken out and fully ground to obtain a light conversion phosphor sample.

Embodiment 2

[0060] Light Conversion Phosphor Zn 3 Ga 2 GeO 8 :0.25Cr 3+ , 0.01Yb 3+ Preparation: Weigh ZnO (analytical pure) 0.2458g, Yb 2 o 3 (Analytical pure) 0.002g, Cr 2 o 3 (Analytical pure) 0.0192g, Ga 2 o 3 (Analytical pure) 0.1640g, GeO 2 (Analytical pure) 0.1046g. Mix the above raw materials evenly and put them into a mortar, add absolute ethanol for thorough grinding, put them into a corundum crucible, and then carry out high-temperature solid-phase synthesis in an air atmosphere. In this embodiment, the calcination temperature is set to 1380° C., and the calcination time is 8 hours. After the resistance furnace is cooled to room temperature, the sample is taken out and fully ground to obtain a light conversion phosphor sample.

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Abstract

The invention provides light conversion phosphor powder and a preparation method thereof. The light conversion phosphor powder is prepared through a high-temperature solid phase sintering method, thechemical formula is M3-yGa2-xGeO8:xCr3+, yRE3+, wherein M is selected from one or more of combination of Zn, Ba, Ca and Sr, RE is selected from one or more of combination of Yb, Nd and Ho, the value of x ranges from 0 to 0.50, preferably from 0.15 to 0.30, and the range of y is 0. 0.001 to 0.05, preferably from 0.005 to 0.02. According to the light conversion phosphor powder, Cr3+ and near-infrared emitting rare earth ions RE3+ (Yb3+, Nd3+, Ho3+ and combinations thereof) are mixed in matrix, the Cr3+ is sued as a sensitizer to efficiently absorb ultraviolet light and visible light with a widespectrum of 250-650 nanometre, the energy is transmitted to the activator RE3+ to excite high-intensity near-infrared light, since the Cr3+ is a non-rare earth element, the rare earth ion RE3+ has a low mixing amount, and the production cost is reduced to some extent; spectral response of a silica-based solar battery is well matched, and the powder can be used as silicon-based solar battery spectral conversion phosphor powder.

Description

technical field [0001] The invention relates to the field of spectrum conversion luminescence, in particular to a light conversion fluorescent powder and a preparation method thereof. Background technique [0002] Sunlight contains light of various wavelengths, and current single-junction solar cells can only utilize a part of them. Taking silicon-based solar cells as the most widely used in current technology as an example, the Eg (band gap) of silicon semiconductors is 1.12eV. The infrared light of 1100nm will pass through the battery, so it cannot be used; and for the photons with higher energy in the short-wave range, electrons and holes (carriers) will be excited to a higher energy state, and they will pass through the P-N junction. Excess energy is lost due to heat exchange with the crystal lattice prior to the formation of current. In addition, silicon solar cells have different light responses to different wavelengths, especially the light response to the ultraviol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
CPCC09K11/7708
Inventor 赵磊范飞月蔡忆雨商一凡李艳艳
Owner BAOJI UNIV OF ARTS & SCI