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A method for improving the stability of quantum dots in aqueous phase

A technology of quantum dots and stability, applied in the field of lighting, can solve the problems of long preparation time, poor stability, and poor luminous performance, and achieve the effect of increasing the number of photoexcitations, preventing direct effects, and improving luminous performance

Active Publication Date: 2019-10-29
GUANGDONG REAL FAITH LIGHTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current conventional water-phase quantum dots, especially red quantum dots, have poor luminescence performance, wide half-peak width, and low quantum yield; at the same time, the preparation time is long and the stability is poor, so they cannot be directly used in high-efficiency LEDs, especially in the field of display backlighting.
[0006] However, the quantum dot crystal quality, luminous intensity, and stability obtained in the aqueous phase system are poor, and it is difficult to control the preparation of the core-shell structure, which is difficult to improve stability.
The existing application of water-phase quantum dots is mainly concentrated in the field of bioluminescent probes. At the same time, the quality of water-phase quantum dot crystals obtained by traditional preparation processes is poor, and there are relatively few research works on WLEDs, especially about wide color gamut. (>110% NTSC), high CRI (Ra>90, R9>90) show that the field of lighting is still blank

Method used

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  • A method for improving the stability of quantum dots in aqueous phase
  • A method for improving the stability of quantum dots in aqueous phase
  • A method for improving the stability of quantum dots in aqueous phase

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Experimental program
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Embodiment 1

[0027] (1) Take 2 mg of red CdTe quantum dots prepared in the aqueous phase system, mix with 2 g of 1-aminopropyl-3-methylimidazolium bromide salt ionic liquid, stir and react for 30min-12h, and bond the surface of quantum dots through amino groups, Quantum dots modified by ionic liquids are realized by exchanging sulfhydryl ligands on the surface of quantum dots with a large number of ionic liquids.

[0028] After the ionic liquid exchange, the quantum dot surface bond and the ionic liquid protective layer with a thickness of 10-20nm, the distance between the quantum dots>10nm, can effectively reduce the fluorescence resonance energy transfer (FRET) between the quantum dots, and reduce the distance between the quantum dots. reunion between.

[0029] (2) The water-soluble quantum dot itself is a colloid dispersed in an aqueous solution, and its existing form is liquid. LED encapsulation devices require a solid powder or film light conversion layer, which cannot directly use q...

Embodiment 2

[0034] Take 10mg of the green CdSe quantum dots prepared in the aqueous phase system, mix them with 1g of 1-carboxyethyl-3-methylimidazolium bromide salt ionic liquid, stir and react for 30min-12h, and form ligands through a large number of carboxyl groups and sulfhydryl groups on the surface of the quantum dots exchanged to obtain modified quantum dots. The modified quantum dots are mixed with potassium bromide saturated solution to obtain quantum dot-potassium bromide mixed crystals. refer to Figure 4 The schematic diagram of the preparation process of the quantum dot-polymer microsphere shown, the quantum dot-potassium bromide mixed crystal is mixed with the polymer (such as PMMA, PS, etc.) solution, and realizes micron, submicron (100nm -10 μm) quantum dot-polymer microspheres, the spherical quantum dot-polymer composite microspheres can be directly used for On-Chip packaging of LEDs.

Embodiment 3

[0036] Take 10 mg of CdS quantum dots prepared in the aqueous phase system, mix them with 0.1 g of 1-carboxyethyl-3-methylimidazolium chloride salt ionic liquid, stir and react for 30min-12h, and form ligands through a large number of carboxyl groups and sulfhydryl groups on the surface of quantum dots exchanged to obtain modified quantum dots. The modified quantum dots are mixed with a sodium tetraborate saturated solution to obtain quantum dot-sodium tetraborate mixed crystals.

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Abstract

The invention discloses a method used for increasing the stability of a water phase quantum dot. According to the method, an ionic liquid and the water phase quantum dot are subjected to ligand exchange so as to obtain a modified quantum dot ionic liquid, wherein the boiling point of the obtained modified quantum dot ionic liquid is high, is usually higher than 200 DEG C, and the stability of the modified quantum dot ionic liquid is always better than that of small molecular ligands, such as mercaptoacetic acid, mercaptopropionic acid, and glutathione, used for conventional water phase quantum dot preparation. The ligand exchange of the ionic liquid with the water phase quantum dot is adopted, so that the ionic liquid is converted into a quantum dot coated by a ligand, and the stability of single quantum dot is improved; the ionic liquid is an ionic crystal, an inorganic salt crystal is also ionic crystal, the ionic liquid modified quantum dot is capable of matching growth process of inorganic salt crystal, after mixing with inorganic salt, agglomeration among quantum dot is not easily caused, and uniform dispersed solid state quantum dot with high stability is obtained; the particle size of the solid state quantum dot can be adjusted via grinding, so that solid state quantum dot of different optical properties can be obtained.

Description

technical field [0001] The invention relates to the field of lighting technology, in particular to a method for improving the stability of quantum dots in water phase. Background technique [0002] Semiconductor lighting technology is a new type of lighting technology based on high-efficiency white light emitting diodes (White Light Emitting Diode, WLED), which is recognized as one of the most promising high-tech fields in the 21st century. In terms of the domestic LED industry, the overall output value of my country's semiconductor lighting industry exceeded 500 billion yuan for the first time in 2016, and the industry scale reached 521.6 billion yuan, but most of it was concentrated in the downstream assembly process, and the production capacity of high-tech was low, and the main competitive technologies were still in the hands of Foreign patents. The nine major national key research and development plans in 2016 again mention the concept of nanometer and quantum, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/56C09K11/70C09K11/62
CPCC09K11/025C09K11/565C09K11/621C09K11/70C09K11/883
Inventor 王恺郝俊杰徐冰邓建孙小卫
Owner GUANGDONG REAL FAITH LIGHTING TECH
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