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Nitride fluorescent powder as well as preparation method and application thereof

A nitride phosphor, phosphor technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as deterioration, and achieve the effects of high reliability and excellent durability

Pending Publication Date: 2022-04-15
衡阳华灏新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the process of realizing the technical solution of the invention in the embodiment of the present application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: the known SLAN phosphors are easily deteriorated due to oxygen, heat, water, etc., so it is necessary to further improve the use of SLAN. Phosphor Durable Light-Emitting Device

Method used

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  • Nitride fluorescent powder as well as preparation method and application thereof
  • Nitride fluorescent powder as well as preparation method and application thereof
  • Nitride fluorescent powder as well as preparation method and application thereof

Examples

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preparation example Construction

[0025] The preparation method includes the steps of preparing a calcined product having the molecular formula AvBwCxAl3-ySiyNz, contacting the calcined product with a fluorine-containing substance and heat-treating the calcined product at a temperature of 200°C or higher and 500°C or lower.

[0026] The parameter v is preferably 0.90 or higher, 1.00 or lower, preferably 0.90 or higher, 1.00 or lower, from the viewpoint of stability of the crystal structure. The parameter x represents the activation amount of at least one element selected from the group consisting of Eu, Ce, Tb, and Mn, which can be properly selected to achieve the target characteristics. The parameter x preferably satisfies 0.001<x≦0.020, preferably satisfies 0.002≦x≦0.015.

[0027] The core part of the fluorescent material is a mixture fired in a nitrogen atmosphere. For example, firing can be performed using a gas pressurized electric furnace. The firing temperature may be 1,000°C or above and 1,400°C or b...

Embodiment 1

[0053] A fluorescent material containing strontium, lithium, europium, aluminum and N was prepared. Specifically, for a fluorescent material composed of the formula AvBwCxAl3-ySiyNz, where A is Sr, B is Li, C is Eu, SrNu (where u corresponds to 2 / 3, is Sr 2 mixture of N and SrN), using SrF 2 ,, LiAlH 4 , AlN and EuF 3 as material. In this example, the parameter y in the formula is 0. The materials were weighed so that the molar ratio of Sr / Li / Eu / Al was 0.9925 / 1.2000 / 0.0075 / 3.0000, and then mixed in a glove box in an inert atmosphere to obtain a material mixture. SrNu and SrF 2 The mass ratio is 94 / 6. Since Li (lithium) has a tendency to fly during the baking process, the amount of Li (lithium) is greater than the theoretical value. The material mixture was charged in a crucible and heat-treated in a nitrogen atmosphere at a gas pressure of 0.92 MPa gauge (1.02 MPa absolute) at a temperature of 1100 °C for 3 hours to provide a calcined product of material composition Sr ...

Embodiment 2

[0057] A nitride fluorescent material in powder form was prepared in the same manner as in Example 1, except that the temperature was changed to 250°C.

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Abstract

The invention provides nitride fluorescent powder as well as a preparation method and application thereof. The nitride fluorescent material is small in chromaticity change and good in durability under high-temperature and high-humidity conditions. The composition of the nitride fluorescent material comprises: at least one element selected from the group consisting of Ca, Sr, Ba and Mg; at least one element selected from the group consisting of Li, Na and k; at least one element selected from the group consisting of Eu, Ce, Tb and Mn; al and N. The method comprises preparing a calcined product having the composition, contacting the calcined product with a fluorine-containing substance, and heat treating the calcined product at a temperature of 200 DEG C to 500 DEG C. A light emitting device using the nitride fluorescent material is also provided.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder manufacturing, and in particular relates to a nitride fluorescent powder and a preparation method and application thereof. Background technique [0002] Light-emitting devices composed of laser (LD) and fluorescent materials have been used more and more widely as lighting equipment and backlight sources for liquid crystal displays. For example, in the case of using a light emitting device in a liquid crystal display device, a fluorescent material with a narrow half bandwidth is required to provide a wider range of color reproducibility. [0003] Examples of such fluorescent materials include red-emitting phosphors of SrLiAl3N4:Eu (hereinafter simply referred to as "SLAN phosphors"). The current patented technology discloses SLAN phosphors with a narrow half bandwidth of 70nm or less and a peak fluorescence wavelength around 650nm. The preparation of a kind of SLAN phosphor described i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64C09K11/02C09K11/80H01L33/50
Inventor 刘河洲杨卫桥李华
Owner 衡阳华灏新材料科技有限公司
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