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Fluorescent film containing near-infrared fluorescent powder and application thereof

A phosphor and near-infrared technology, applied in the field of optical materials, can solve the problems of accelerated solar cell aging, low solar cell efficiency, and inability to be utilized, and achieves improved solar light utilization, excellent solar spectrum adjustment function, and preparation efficiency. added effect

Inactive Publication Date: 2019-05-14
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the most widely used silicon-based solar cells as an example, the band gap of silicon semiconductors is 1.12eV. This data shows that only light with a wavelength of less than 1166nm in sunlight can be converted by silicon-based solar cells, while infrared light with a wavelength greater than 1166nm The light will directly pass through the silicon-based solar cell and cannot be used; for photons with shorter wavelengths and higher energy in sunlight, these photons will excite the electrons and holes in the semiconductor to a higher energy state, Causes excitons to exchange heat with the lattice before passing through the PN junction, causing energy loss and accelerating the aging of solar cells
In general, the mismatch between silicon-based solar cells and the solar spectrum will cause a lot of waste of sunlight, which is one of the reasons why the efficiency of solar cells is generally not high

Method used

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  • Fluorescent film containing near-infrared fluorescent powder and application thereof
  • Fluorescent film containing near-infrared fluorescent powder and application thereof
  • Fluorescent film containing near-infrared fluorescent powder and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: a kind of fluorescent film, by the commercial K of 56wt% 2 O-Na 2 O-Al 2 o 3 -SiO 2 Glass powder with 56wt% LiEu 6.3 (MoO 4 ) 2 :Nd 3+ 6.7 Near-infrared phosphor composition

[0030] The first step is to accurately weigh 6.4683g of lithium carbonate, 1.3382g of europium oxide, 3.6488g of molybdenum trioxide and 6.8536g of neodymium oxide according to the stoichiometric ratio, and grind them in an agate mortar to make them uniform. / min heating rate to 866°C and calcined at 866°C for 5h, cooled to room temperature 25°C, crushed and ground the sample, then raised the temperature to 666°C at a heating rate of 5°C / min in the muffle furnace and heated at 666°C Calcined at low temperature for 3h, cooled naturally to room temperature 25°C, and then fully ground to obtain the final product LiEu 6.3 (MoO 4 ) 2 :Nd 3+ 6.7 .

[0031] In the second step, the LiEu obtained in the first step is 6.3 (MoO 4 ) 2 :Nd 3+ 6.7 Near-infrared phosphors and co...

Embodiment 2

[0035] Embodiment 2: a kind of fluorescent film, by the commercial K of 56wt% 2 O-Na 2 O-Al 2 o 3 -SiO 2 Glass powder with 56wt% LiEu 6.2 (MoO 4 ) 2 :Nd 3+ 6.8 Near-infrared phosphor composition

[0036] The first step is to accurately weigh 6.4666g of lithium carbonate, 1.3464g of europium oxide, 3.6548g of molybdenum trioxide and 6.8544g of neodymium oxide according to the stoichiometric ratio, and grind them in an agate mortar to make them uniform. The heating rate was raised to 866°C and calcined at 866°C for 5 hours. After cooling to room temperature at 25°C, the sample was crushed and ground, and then heated to 666°C at a heating rate of 5°C / min in the muffle furnace and heated at 666°C. Calcined at low temperature for 3h, cooled naturally to room temperature 25°C, and then fully ground to obtain the final product LiEu 6.3 (MoO 4 ) 2 :Nd 3+ 6.8 .

[0037] In the second step, the LiEu obtained in the first step is 6.2 (MoO 4 ) 2 :Nd 3+ 6.8 Near-infrare...

Embodiment 3

[0038] Embodiment 3: a kind of fluorescent film, by the commercial K of 56wt% 2 O-Na 2 O-Al 2 o 3 -SiO 2 Glass powder with 56wt% LiEu 6.4 (MoO 4 ) 2 :Nd 3+ 6.6 Near-infrared phosphor composition

[0039] The first step is to accurately weigh 6.4675g of lithium carbonate, 1.3366g of europium oxide, 3.6426g of molybdenum trioxide and 6.8516g of neodymium oxide according to the stoichiometric ratio, and grind them in an agate mortar to make them uniform. The heating rate was raised to 866°C and calcined at 866°C for 5 hours. After cooling to room temperature at 25°C, the sample was crushed and ground, and then heated to 666°C at a heating rate of 5°C / min in the muffle furnace and heated at 666°C. Calcined at low temperature for 3h, cooled naturally to room temperature 25°C, and then fully ground to obtain the final product LiEu 6.4 (MoO 4 ) 2 :Nd 3+ 6.6 .

[0040] In the second step, the LiEu obtained in the first step is 6.4 (MoO 4 ) 2 :Nd 3+ 6.6 Near-infrare...

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Abstract

The invention discloses a fluorescent film containing near-infrared fluorescent powder and an application thereof. The fluorescent film is prepared by the following steps: weighing and mixing raw materials evenly according to metering ratios of elements in a chemical formula, calcining the raw materials in a muffle furnace, carrying out cooling, crushing and grinding, and carrying out grinding andsieving after an annealing process to prepare LiEu(MoO4)2:Nd<3+> near-infrared fluorescent powder; and mixing the near-infrared fluorescent powder with glass powder uniformly, adding an organic glue,stirring the mixture into a gel shape, carrying out heating curing, and then calcining the mixture in a muffle furnace to obtain the fluorescent film. The fluorescent film can be excited by ultraviolet and visible light, and the luminous range is 1656-1166nm. The near-infrared fluorescent film prepared by the method has excellent luminous performance, can be used for preparing solar cells, can convert solar spectra which cannot be utilized by some solar cells into near-infrared light with a wavelength within 1166nm to be applied by the solar cells, thereby improving the conversion efficiencyof the solar cells.

Description

technical field [0001] The invention relates to the technical field of optical materials, in particular to a near-infrared phosphor LiEu(MoO 4 ) 2 :Nd 3+ The preparation method of the fluorescent thin film and its application in the preparation of solar cells. Background technique [0002] With the continuous development of human society, problems such as global energy shortage and environmental pollution are constantly exposed, and people are paying more and more attention to the problem of new energy. Solar energy is more and more researched by researchers because of its abundant energy supply, no pollution, and easy access. As early as 2668, the Electronic Science and Technology Committee of the Ministry of Information Industry clearly stated: "Solar cells will occupy an irreplaceable position in the future energy structure and play a vital role in the country's energy security." Now, solar cells It has also become a solar device that can be seen everywhere in daily l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78C09K11/02H01L31/055
CPCY02E10/52
Inventor 王乐冯小惠张宏魏然王富强潘贵明
Owner CHINA JILIANG UNIV
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