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Planar fluorescent condenser with scattering particles and fluorescent quantum dots and method for preparing planar fluorescent condenser

A technology of fluorescent quantum dots and scattering particles, which is applied in the field of planar fluorescent concentrators containing scattering particles and copper indium sulfur quantum dots and its preparation, and can solve the problems of restricting the wide application of CIS, complicated preparation process, and low photoelectric conversion efficiency , to achieve the effect of enhancing the light conversion efficiency

Active Publication Date: 2017-01-11
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inherent defects of thin-film solar cells, such as low photoelectric conversion efficiency, complex preparation process, and high production cost, the wide application of CIS is limited.
At present, although there is CIS research on the Luminescent Planar Concentrator (LPC), due to the self-absorption of the luminous body, the limited absorption range, the loss of the surface, and the dissipation of energy, the light conversion efficiency of the LPC device is limited. are relatively low, even if CIS nanoparticles without heavy metals, wide absorption range, and large stokes-shift (small self-absorption) are used as luminous bodies, the degree of improvement in light conversion efficiency is very limited, which cannot meet the needs of practical applications. , therefore, it is of great significance to study a low-cost concentrator with high photoelectric conversion efficiency

Method used

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  • Planar fluorescent condenser with scattering particles and fluorescent quantum dots and method for preparing planar fluorescent condenser
  • Planar fluorescent condenser with scattering particles and fluorescent quantum dots and method for preparing planar fluorescent condenser
  • Planar fluorescent condenser with scattering particles and fluorescent quantum dots and method for preparing planar fluorescent condenser

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preparation example Construction

[0072] A method for preparing a planar fluorescent concentrator, the planar fluorescent concentrator includes scattering particles, fluorescent quantum dots and a planar optical waveguide.

[0073] The preparation method of the specific planar fluorescent concentrator includes the following processes:

[0074] (1) Preparation of fluorescent quantum dots. Those skilled in the art can prepare fluorescent quantum dots with reference to the method of prior art, and the preferred method for preparing copper indium sulfur quantum dots (CIS-QDs) is as follows: weigh cuprous iodide (CuI) and indium acetate ( In(Ac) 3 ), added to a three-necked flask, measured excess dodecanethiol (1-dodecanethiol, DDT) and paraffin solution, added to the three-necked flask successively, stirred and mixed evenly. Under the protection of continuous passage of inert gas, the above mixed solution is continuously heated and heated until the mixed solution turns from black to light red, then the heating i...

Embodiment 1

[0084] In this example, the fluorescent material CIS-QDs is synthesized by "One-Pot Reaction". The synthesized CIS-QDs have the characteristics of broadband blue-violet light absorption and broadband red-orange light emission, and can convert blue-violet light Converted to red light, its characteristic spectrum is as Figure 4 shown. The specific implementation process is:

[0085] (a) Weigh 1mmol CuI and 1mmol In(Ac) 3 , into a 50ml three-necked flask, measure 10ml DDT and 20ml liquid paraffin, and add them in turn to the three-necked flask and stir to mix evenly. In the continuous pass there are N 2 Under the protection of the above-mentioned mixed solution, heat the above mixed solution at 200°C for 20 minutes, the solution turns from black to light red, stop heating and quickly cool to room temperature, wash repeatedly with the mixed solution of n-hexane and absolute ethanol to remove impurities, and then vacuum dry to obtain copper Indium sulfur quantum dot (CIS-QDs) ...

Embodiment 2

[0090] In this embodiment, the fluorescent material used is copper indium sulfur quantum dots coated with ZnS on the surface of the core / shell (Core / Shell) structure, and the chemical composition is CuInS 2 / ZnS, naming the copper indium sulfur quantum dots coated with ZnS as CIS / ZS-QDs, the CIS / ZS-QDs of the core-shell structure has the characteristics of high quantum yield and adjustable emission wavelength, by wrapping ZnS, It can convert blue-violet light into red-orange light, and its characteristic spectrum is as follows Figure 5 Shown; The material used in the optical waveguide is granular PMMA. The specific implementation process is:

[0091] (a) Weigh 1mmol Zn(Ac) 2 In the beaker, add 10ml of liquid paraffin, stir and mix evenly, set aside;

[0092] (b) Weigh 1mmol CuI and 1mmol In(Ac) 3 , into a 50ml three-necked flask, measure 15ml DDT and 10ml liquid paraffin, and add them to the three-necked flask in turn to stir and mix evenly. 2 Under the protection of pro...

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Abstract

The invention discloses a planar fluorescent condenser and a method for preparing the same. The planar fluorescent condenser comprises scattering particles, fluorescent quantum dots and planar optical waveguides. The method includes (1), preparing fluorescent quantum dot dispersing liquid; (2), mixing polymers and / or raw materials for preparing the polymers with the scattering particles, preparing the composite planar optical waveguides by the aid of obtained mixed solution, combining the fluorescent quantum dot dispersing liquid with the composite planar optical waveguides to obtain the composite planar fluorescent condenser, alternately, carrying out a step (2)' instead of the step (2) after the step (1) is carried out, to be more specific, mixing the polymers and / or the raw materials for preparing the polymers, the scattering particles and the fluorescent quantum dot dispersing liquid with one another and preparing the doped planar fluorescent condenser by the aid of mixed solution. The planar fluorescent condenser and the method have the advantages that the light conversion efficiency of the planar fluorescent condenser can be improved by more than 50% as compared with planar fluorescent devices without doped scattering particles, and the planar fluorescent condenser and the method are low in cost and have broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of solar power generation, and relates to a planar fluorescent concentrator and a preparation method thereof, in particular to a planar fluorescent concentrator containing scattering particles and copper indium sulfur quantum dots and a preparation method thereof. Background technique [0002] Quantum dot materials (Quantum Dots, QDs), especially heavy metal-free copper indium sulfur (chemical formula CuInS 2 , referred to as CIS) nanoparticles as light emitters, have a wide absorption range, large stokes-shift (small self-absorption), excellent light and heat stability, high transparency, and efficient fluorescence, green environmental protection. According to the difference of synthesis temperature, CIS will show three different crystal structures, which are chalcopyrite structure when it is lower than 980°C, wurtzite structure when it is higher than 1050°C, and wurtzite structure when it is between 980 an...

Claims

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Application Information

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IPC IPC(8): H02S40/22H01L31/055H01L31/18
CPCH01L31/055H01L31/18H02S40/22Y02E10/52Y02P70/50
Inventor 王恺李臣郝俊杰陈威秦静邓建孙小卫
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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