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Surface finishing method for copper ion doped zinc sulfide nano-material

A nano-material and surface modification technology, applied in the field of luminescent materials, can solve the problems that hinder the practical process of nano-luminescent materials, luminescence quenching, and low luminous efficiency of nano-materials, and achieve the effect of reducing non-radiative transition channels

Inactive Publication Date: 2011-07-27
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of surface states on the surface of nano-luminescent material particles mostly quench the luminescence, resulting in extremely low luminous efficiency of nano-materials, which seriously hinders the practical application of nano-luminescent materials. Therefore, the control of the surface states of nano-luminescent material particles is realized. It is the key to improving the luminous efficiency of nanomaterials
The existing copper ion-doped zinc sulfide material is widely used in the display field as a green luminescent material. However, after nanometerization, due to the quenching effect of the surface state, the luminous efficiency is very low. How to control the surface state and improve the luminous intensity become an urgent issue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] First take by weighing the copper ion doped ZnS nanoparticle sample that the copper ion doping concentration is 0.2mol%, particle size size is 4.6nm, joins in deionized water, controls the concentration of copper ion doped ZnS nanoparticle in water to be 0.01mol / L, ultrasonically disperse for 2h, then adjust the pH to 10 with ammonia water, add ethyl silicate drop by drop at a speed of 20 seconds / drop under stirring, the mixture of ethyl silicate and ZnS nanoparticles doped with copper ions The molar ratio was controlled at 4.5:1. After the dropwise addition was completed, the stirring was continued for 30 minutes. Then centrifuge at a speed of 5000 rpm to obtain a precipitate, which is washed three times with deionized water and absolute ethanol to remove unreacted substances and by-products. Finally, vacuum drying at 80 °C for 3 h, the obtained SiO 2 In the modified copper ion-doped zinc sulfide nanomaterial, the luminescence enhancement at 530-550 nm is 2.85 times t...

Embodiment 2

[0011] According to the conditions of Example 1, only changing the rate of addition of ethyl silicate to be 10 seconds / drop, the obtained SiO 2 In the modified copper ion-doped zinc sulfide nanomaterial, the luminescence enhancement at 530-550 nm is 1.92 times that before surface modification.

Embodiment 3

[0013] According to the conditions of Example 1, only changing the pH to 9.5, the obtained SiO 2 The modified copper ion-doped zinc sulfide nanomaterial has a luminescence enhancement at 530-550 nm of 2.43 times that before surface modification.

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Abstract

The invention discloses a surface decoration method for a zinc sulphide nanometer material mixed with copper ions and is characterized by including the steps of: weighing a zinc sulphide nanometer grain sample mixed with the copper ions, adding the sample into de-ionized water, dispersing the sample by ultra audible sound, adjusting the pH value, dropping ethylsilicate under stirring and continuously stirring after finishing dropping; growing the silicon dioxide generated by hydrolyzing the ethylsilicate on the surface of the zinc sulphide nanometer grain by taking the zinc sulphide nanometer grain mixed with the copper ions as a crystal nucleus for beginning to realize the decoration of the silicon dioxide to the surface of the zinc sulphide nanometer grain mixed with the copper ions; then obtaining a deposit through centrifugation, using the de-ionized water and absolute ethyl alcohol to wash for removing unreacted matters and byproducts; and obtaining the zinc sulphide nanometer material mixed with copper ions and decorated by the silicon dioxide through vacuum drying. The surface decoration method has the advantages that the surface states of the zinc sulphide nanometer material mixed with copper ions are reduced through surface decoration, luminescent idlertransition channels are reduced and the luminescent intensity can achieve 1.82 to 5.72 times than that before decoration.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a method for modifying the surface of a copper ion-doped zinc sulfide nanometer material. Background technique [0002] The characteristics of nano-luminescent materials in terms of morphology and properties give them advantages in application, such as significantly improving the uniformity of the cathode ray tube coating, helping to improve the quality of the coating and the clarity of the display; it can be compared with nanoelectronic devices match etc. However, a large number of surface states on the surface of nano-luminescent material particles mostly quench the luminescence, resulting in extremely low luminous efficiency of nano-materials, which seriously hinders the practical application of nano-luminescent materials. Therefore, the control of the surface states of nano-luminescent material particles is realized. It is the key to improving the luminous efficiency of nanomaterial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/58C09K11/02
Inventor 曹立新孙远光苏革柳伟
Owner OCEAN UNIV OF CHINA