High-quantum-yield copper nanocluster fluorescent nanoflowers and preparation method and application thereof in LEDs

A fluorescent nanometer and copper nanotechnology, applied in the fields of nano optics, nanotechnology, nanotechnology, etc., can solve the problem of low fluorescence quantum yield of copper nanocluster fluorescent materials, difficult to directly apply to the LED field, and copper nanocluster quantum yield. problems such as low rate, to achieve the effect of excellent luminous intensity, unique properties and novel structure

Active Publication Date: 2021-06-25
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluorescence quantum yield of the copper nanocluster fluorescent material is still low
[0006] In summary, the current reports on copper nanoclusters are limited to the exploration of synthesis methods, the regulation of emission peak positions, and the research in the field of detection. For the preparation of copper nanocluster fluorescent materials with high quantum yield and their application in high There are few reports on the application research in the field of power white LED
Moreover, the quantum yields of existing copper nanoclusters are very low, and it is difficult to be directly applied to the LED field. Most of the conditioning and tempering materials used for LED white light luminescent materials can only be made of three or more materials, and the cost is relatively high.

Method used

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  • High-quantum-yield copper nanocluster fluorescent nanoflowers and preparation method and application thereof in LEDs
  • High-quantum-yield copper nanocluster fluorescent nanoflowers and preparation method and application thereof in LEDs
  • High-quantum-yield copper nanocluster fluorescent nanoflowers and preparation method and application thereof in LEDs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A method for preparing fluorescent nanoflowers of copper nanoclusters, comprising the following steps:

[0075] (1)Cu 4 I 4 Synthesis

[0076] Disperse CuI (500mg, 2.6mmol) in dichloromethane solution, stir for 10min, add triphenylphosphine (524mg, 2.0mmol) to the miscible solution, stir well at room temperature for 2 hours, and filter with suction to obtain a white powder solid. The above-mentioned white powdery solid is added in excessive acetonitrile solution, ultrasonic, excess CuI is removed, suction filtration, acetonitrile washing, obtain pure white powdery solid. Take 10 mg of the above-mentioned pure white solid powder and dissolve it in 2 mL of dimethyl sulfoxide solution, add it to a diffusion glass tube, add 2 mL of methanol solution to the upper layer to diffuse, and obtain Cu 4 I 4 powder.

[0077] (2) Preparation of fluorescent nanoflowers of copper nanoclusters

[0078] Weigh 5mg of Cu 4 I 4 , add 2mL dimethyl sulfoxide, then add 2mL glycerol, v...

Embodiment 2

[0089] A method for preparing an LED emitting yellow-green light, comprising the following steps:

[0090] Centrifuge and dry the fluorescent nanoflowers of copper nanoclusters prepared in Example 1 into powder, accurately weigh 5 mg of the nanoflower powder, grind them thoroughly with a mortar, and then accurately weigh the amount of high-refractive LED patch silica gel A and glue B respectively. The quality is 5mg and 20mg, and they are mixed evenly according to the mass ratio of 1:4, and the sample powder is mixed evenly with commercial glue, and the mixed mucus about the size of a bean is taken, deposited on a commercially available LED chip, and heated at 60°C Curing in an oven for 3 hours to produce LEDs.

[0091] The present embodiment obtains the LED figure of emitting yellow-green light such as Figure 6 (a) shown. Spectral analysis shows that the color coordinates of the fluorescence emission spectrum obtained under the excitation wavelength of 365 nm for the yello...

Embodiment 3

[0093] A method for preparing an LED emitting sky blue light, comprising the following steps:

[0094] Accurately weigh 5 mg and 10 mg of the copper nanocluster fluorescent nanoflower powder and blue phosphor powder prepared in Example 1, respectively. Grind thoroughly with a mortar, then accurately weigh 5 mg and 20 mg of high-refractive LED patch silica gel A and B respectively, mix them evenly according to the mass ratio of 1:4, mix the sample powder with commercial glue, and take about The size of the mixed slime was deposited on a commercially available LED chip and cured in an oven at 60°C for 3 hours to manufacture LEDs.

[0095] The present embodiment obtains the LED figure that sends sky blue light as follows Figure 6 (b) shown. Spectral analysis shows that the color coordinates of the fluorescent emission spectrum obtained from the sky-blue LED prepared in this embodiment at an excitation wavelength of 365 nm are (0.23, 0.24).

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Abstract

The invention relates to high-quantum-yield copper nanocluster fluorescent nanoflowers and a preparation method and application thereof in LEDs, wherein the copper nanocluster fluorescent nanoflowers are formed by dissolving Cu4I4 into dimethyl sulfoxide and then self-assembling with glycerol. The prepared Cu4I4 fluorescent nanoflowers have outstanding optical properties, the quantum yield reaches up to 64.5%, meanwhile, a series of LEDs with different light emitting colors such as yellow green, sky blue and white and good stability can be prepared through the Cu4I4 fluorescent nanoflowers and commercial blue fluorescent powder, and white light emitting LEDs can be prepared by mixing the Cu4I4 fluorescent nanoflowers and the commercial blue fluorescent powder according to the mass ratio of 4:5. A light-emitting copper cluster can successfully replace a light conversion material of a traditional material, and environment-friendly LEDs can be achieved. The preparation method of the copper nano-cluster fluorescent nanoflowers is simple, the super-bright white light LEDs can be prepared only through two kinds of fluorescent powder, and the cost is low; and the prepared LEDs have super-strong luminous intensity and meet the requirement of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of LED lighting, and in particular relates to a method for preparing fluorescent nanoflowers of copper nanoclusters with high quantum yield and its application in LEDs. Background technique [0002] Solid-state lighting in the form of light-emitting diodes (LEDs) has excellent properties such as fast response time, high luminous efficiency, and wide temperature control range. Therefore, it has received extensive research and attention in recent years. Metal nanoclusters, consisting of a few to a hundred atoms, are potential substitutes for lighting and display applications due to their ultrasmall size and unique electronic structure. Compared with traditional organic dyes and semiconductor quantum dots, metal nanoclusters have the advantages of ultra-small size, large Stokes shift, and low toxicity, and can be used as light-emitting materials for manufacturing LEDs. A great deal of research has been done on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/58C09K11/02B82Y20/00B82Y40/00H01L33/50H01L51/50H01L51/54
CPCC09K11/58C09K11/025B82Y20/00B82Y40/00H01L33/502H01L2933/0041H10K50/115H01L33/504H01L33/501H01L33/505H01L33/005H01L33/06
Inventor 辛霞周淑瑾孙頔张闪闪冯宁
Owner SHANDONG UNIV
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