Treatment method of silicon dioxide nanoparticles for blue-green fluorescent powder

A silicon dioxide and nanoparticle technology, applied in the fields of nanotechnology, chemical instruments and methods, and nanotechnology for materials and surface science, it can solve problems such as performance limitations and inability to make further breakthroughs, and achieve stable product performance and preparation. Less demanding timing requirements, the effect of increasing production

Pending Publication Date: 2021-03-16
XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The light emission performance of phosphors can be well regulated by changing the doping concentration, the properties of precursors and co-dopants, but when the change of dopant ions is limited, its performance is often limited and cannot be further broken through

Method used

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  • Treatment method of silicon dioxide nanoparticles for blue-green fluorescent powder
  • Treatment method of silicon dioxide nanoparticles for blue-green fluorescent powder
  • Treatment method of silicon dioxide nanoparticles for blue-green fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Ca 2 SiO 4 : 0.05Eu 2+

[0017] Commercially available Ca 2 SiO 4 : Eu 2+ The phosphor powder was ground in acetone and calcined at 700° C. for 2 hours to obtain the blue-green phosphor.

Embodiment 2

[0018] Example 2: 0.5SiO 2 -Ca 2 SiO 4 : 0.05Eu 2+

[0019] The treatment method of silica nanoparticles: commercially available polyvinylpyrrolidone (PVP) and absolute ethanol were stirred at room temperature at 200 rpm for 0.5 h at a volume ratio of 2 to obtain a mixed solution A. Then tetraethyl orthosilicate (TEOS) with a purity greater than 99.9% and ammonia water with a concentration of 5 mol / L were added to the mixed solution A to obtain a mixed solution B, wherein tetraethyl orthosilicate accounted for 10% of the mass of the mixed solution B. %. The mixed solution B was calcined at 200° C. for 2 hours to obtain powder particles. The particles are ground to obtain treated silica nanoparticles.

[0020] Preparation of phosphor powder: first, the treated silica particles were mixed with Ca 2 SiO 4 : Eu 2+ Mixed according to the mass ratio of 0.5, ground in acetone and calcined at 700° C. for 2 hours to obtain the blue-green fluorescent powder. Assuming that the ...

Embodiment 3

[0021] Example 3: 3SiO 2 -Ca 2 SiO 4 : 0.05Eu 2+

[0022] The treatment method of silica nanoparticles: commercially available polyvinylpyrrolidone (PVP) and absolute ethanol were stirred at room temperature at 300 rpm for 1 h at a volume ratio of 0.5 to obtain a mixed solution A. Then tetraethyl orthosilicate (TEOS) with a purity greater than 99.9% and ammonia water with a concentration of 0.5 mol / L are added to the mixed solution A to obtain a mixed solution B, wherein tetraethyl orthosilicate accounts for 2% of the mass of the mixed solution B. 20%. The mixed solution B was calcined at 100° C. for 4 hours to obtain powder particles. The particles are ground to obtain treated silica nanoparticles.

[0023] Preparation of phosphor powder: first, the treated silica particles were mixed with Ca 2 SiO 4 : Eu 2+ Mixed according to a mass ratio of 3, ground in acetone and calcined at 500° C. for 4 hours to obtain the blue-green fluorescent powder. Assuming that the lumin...

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Abstract

The invention discloses a treatment method of silicon dioxide nanoparticles for blue-green fluorescent powder, and belongs to the technical field of preparation and application of nano powder. Nano-scale silicon dioxide particles are prepared by utilizing PVP through a solution combustion method, and then the nano-scale silicon dioxide particles are added into Ca2SiO4: Eu < 2 + > fluorescent powder through a solid-state reaction method. The prepared fluorescent powder has blue-green emission at 440-635 nm, and the emission intensity is improved by 25-32% compared with that of non-added treatednano silicon dioxide particles. The treatment method provided by the invention is simple in process, stable in product performance and suitable for industrial production.

Description

technical field [0001] The invention provides a treatment method for silica nanoparticles used in blue-green fluorescent powder, and belongs to the technical field of preparation and application of luminescent materials. Background technique [0002] White light-emitting diodes (w-LEDs) have attracted increasing attention due to their positive properties such as high brightness, high energy efficiency, miniaturization, fast response, long shelf life, and environmental protection (mercury-free). In lighting and backlighting, w-LEDs are widely used due to their high efficiency. InGaN-based blue LEDs with YAG:Ce 3+ (cerium-doped yttrium aluminum garnet), a yellow phosphor, is a typical strategy to generate white light. However, this approach results in poor CRI (color rendering index) and CCT (color color number) due to insufficient red content in their emission spectrum, and in addition, its poor thermal quenching performance. These drawbacks make w-LEDs unsuitable for resi...

Claims

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Application Information

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IPC IPC(8): C09K11/59B82Y20/00B82Y30/00
CPCC09K11/7734B82Y20/00B82Y30/00
Inventor 张乐甄方正邵岑陈东顺赵超邱凡张永丽李延彬
Owner XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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