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Fluorescent material and preparation method and application thereof

A technology of fluorescent materials and raw materials, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of unstable physical and chemical properties of sulfide phosphors, quality damage of white light LED products, poor thermal stability, etc., and achieve low cost and light output Strong strength and good stability

Inactive Publication Date: 2014-12-24
北京大学包头创新研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With increasing demand for phosphors, YAG:Ce 3+ Yellow phosphor can no longer meet the market demand, because this phosphor has disadvantages such as low color rendering and high color temperature, these shortcomings can be made up by red phosphor or green phosphor
Traditional red phosphors have Eu 2+ Activated alkaline earth metal sulfide, but the physical and chemical instability of sulfide phosphor, poor thermal stability, large light decay and other shortcomings, the adverse effects caused by these shortcomings are mainly serious damage to the quality of white LED products, easy to decompose and produce Gases harmful to human body and environmental pollution during synthesis

Method used

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  • Fluorescent material and preparation method and application thereof
  • Fluorescent material and preparation method and application thereof
  • Fluorescent material and preparation method and application thereof

Examples

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preparation example Construction

[0042] The present invention provides a method for preparing a fluorescent material, comprising the following steps:

[0043] (1) Use nitride or oxide and carbonate powder containing M, Si, R, L as raw materials, weigh the corresponding raw materials according to the stoichiometric ratio, and add flux in the proportion of 5%-20% of the total mass of the raw materials , grinding and mixing to obtain a raw material mixture.

[0044] (2) the mixture of step (1) gained is transferred in high temperature furnace, roasting in reducing atmosphere, roasting temperature is 1300-1800 ℃, roasting time is 3-10 hour, and described reducing atmosphere is hydrogen-nitrogen gas mixture, or Carbon monoxide, or toner.

[0045] (3) The product obtained in step (2) is the crude product of the compound described in claim 1, and through ball milling, cleaning, drying, and powder selection, the final product of the compound described in claim 1 is obtained.

Embodiment 1～13

[0049] Under isolated air conditions, the use of Sr 3 N 2 (AR), Si 3 N 4(AR), Ti 3 N 4 (AR), Zr 3 N 4 (AR) and EuN (high purity) were used as raw materials, and the total mass of the raw materials was 50 g, wherein the molar ratios of the constituent elements of the aforementioned compounds in the raw materials were shown in Table 1. Re-incorporation of SrF 2 (AR) as a flux, the weight of the flux is 5% of the total weight of the raw materials, mixed evenly, transferred to a high-temperature furnace, in H 2 In a reducing atmosphere of a hydrogen-nitrogen mixed gas with a content of 4%, roast at 1500 ° C for 6 hours, take out the ball mill after natural cooling, wash with sodium hydroxide, and finally wash with deionized water, dry and select powder.

[0050] Table 1 Molar ratio of each constituent element in the raw materials of Examples 1-13

[0051]

Embodiment 14-20

[0061] Under isolated air conditions, the use of Ca 3 N 2 (AR), Si 3 N 4 (AR), Ti 3 N 4 (AR), Zr 3 N 4 (AR) and EuN (high purity) were used as raw materials, and the total mass of the raw materials was 50 g, wherein the molar ratios of the constituent elements of the aforementioned compounds in the raw materials were shown in Table 3. Re-incorporation of CaF 2 (AR) as a flux, its weight is 6% of the total weight of the raw materials, transferred to a high temperature furnace, in H 2 In a reducing atmosphere of a hydrogen-nitrogen mixed gas with a content of 4%, roast at 1650 ° C for 5 hours, take out the ball mill after natural cooling, wash with sodium hydroxide, and finally wash with deionized water, dry and select powder.

[0062] Table 3 The molar ratio of each constituent element in the raw materials of Examples 14-20

[0063]

[0064] Table 4 shows the emission main peak wavelength (nm), relative luminescence intensity (%) and luminescence maintenance rate (a...

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Abstract

The invention relates to the technical field of functional materials and particularly relates to a fluorescent material and a preparation method and an application thereof. The fluorescent material is prepared from the materials with the following composition: MaSibRcNdOe: Lx, wherein M is selected from one or more of an element group consisting of Mg, Ca, Sr and Ba; R is selected from one or two of Ti and Zr; L is selected from one or more of an element group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The material is good in stability and high in light emitting efficiency. The invention further provides the preparation method of the fluorescent material. The preparation method comprises the following step: mixing compound raw materials containing composition elements with a fluxing agent according to stoichiometric ratio and reducing and roasting to obtain the fluorescent material. The method is environmentally friendly, simple and relatively low in cost, and the obtained product has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to the field of compound functional materials with optical properties, in particular to a fluorescent material and a preparation method and application thereof. Background technique [0002] In 1996, Nichia Corporation of Japan combined yellow YAG:Ce with blue GaN light-emitting diodes (LEDs). 3+ The phosphors get white light, and since then the LED lighting source has entered the stage of practical application. [0003] The white LED lamp is small in size, high in luminous efficiency, low in energy consumption (1 / 8 of incandescent lamps), long in life (100,000 hours), pollution-free or small, high temperature resistance, compression and shock resistance, these advantages are The advantages that the first three generations of lighting lamps (incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps) do not have, and these advantages determine the wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
Inventor 杨小丽罗新宇刘洋王明严群
Owner 北京大学包头创新研究院
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