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A kind of efficient and stable short-wavelength silicate green phosphor and its preparation method and application

A green fluorescent powder, short-wavelength technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve problems such as low luminous efficiency, poor high-temperature quenching performance, poor heat and humidity resistance, and long peak wavelength. Achieve high luminous efficiency, good high-temperature heat quenching performance, and good heat and humidity resistance

Active Publication Date: 2019-02-05
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an efficient and stable short-wavelength silicate green phosphor and its preparation method to solve the problems of the existing green phosphor with long peak wavelength, low luminous efficiency, high temperature quenching performance and poor heat and humidity resistance. question

Method used

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  • A kind of efficient and stable short-wavelength silicate green phosphor and its preparation method and application
  • A kind of efficient and stable short-wavelength silicate green phosphor and its preparation method and application
  • A kind of efficient and stable short-wavelength silicate green phosphor and its preparation method and application

Examples

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preparation example Construction

[0029] The preparation method of above-mentioned fluorescent powder comprises the following steps:

[0030] a. Weighing of raw materials: according to the general chemical formula Ba 2-x-z-q-2n m x Na n Ga n Si y o 4 : zEu, the molar ratio of each element in qMn takes by weighing metal carbonate or metal oxide raw materials containing Ba, M, Na, Ga, Si, Eu, Mn;

[0031] b. Weighing of additives: Weighing ZnCl 2 / EuCl 3 ·6H 2 O combined auxiliary agent, the quality of the combined auxiliary agent is 1% to 5% of the total mass of all raw materials in step a;

[0032] c. Mixing: Mix the raw materials weighed in step a with the combined auxiliary agent weighed in step b by dry ball milling, and then put them into an alumina ark;

[0033]d. Sintering: Place the above-mentioned alumina ark in a vacuum tube furnace, evacuate to a temperature lower than 10Pa, and then replenish the reducing gas at a rate of 0

Embodiment 1

[0039] Example 1: Ba 1.86 Zn 0.076 Na 0.02 Ga 0.02 Si 0.98 o 4 : Preparation of 0.04Eu, 0.024Mn phosphor.

[0040] According to the general chemical formula Ba 1.86 Zn 0.076 Na 0.02 Ga 0.02 Si 0.98 o 4 : The molar ratio of each element in 0.04Eu, 0.024Mn is respectively weighed BaCO 3 , MgCO 3 、Na 2 CO 3 , Ga 2 o 3 , SiO 2 、Eu 2 o 3 , MnCO 3 raw materials, the raw material purity is 99.99%; then weigh ZnCl 2 / EuCl 3 ·6H 2 O combined additives (wherein ZnCl 2 with EuCl 3 ·6H 2 The mass ratio of O is 1: 0.1), and the addition of combined additives is 2% of the total mass of raw materials; combined additives and raw materials are dry ball milled for 8 hours, and then the uniformly mixed materials are put into an alumina ark; The alumina ark with materials is placed in a vacuum tube furnace, vacuumed to less than 10Pa, and then the reducing gas is supplied at a rate of 0 1.86 Zn 0.076 Na 0.02 Ga 0.02 Si 0.98 o 4 : 0.04Eu, 0.024Mn silicate green phosp...

Embodiment 2～6

[0041] Examples 2-6: Ba 1.86 Zn 0.076 Na 0.02 Ga 0.02 Si 0.98 o 4 : Preparation of 0.04Eu, 0.024Mn phosphor.

[0042] Change the additive amount of combined additives, other conditions are the same as in Example 1, the phosphor powder prepared is tested, and the obtained results are shown in Table 1, the comparative example 1 in the table does not add combined additives, other conditions are the same as in Example 1 same.

[0043] Table 1

[0044]

[0045]

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Abstract

The invention provides efficient and stable short-wavelength silicate green fluorescent powder and a preparation method and application thereof. The general chemical formula of the fluorescent powder is Ba2-x-z-q-2nMxNanGanSiyO4:zEu, qMn, wherein M is at least one of Zn, Mg and Ca, 0 is smaller than or equal to x which is smaller than or equal to 0.3, 0.001 is smaller than or equal to n which is smaller than or equal to 0.1, 0.8 is smaller than or equal to y which is smaller than or equal to 1.2, 0.005 is smaller than or equal to z which is smaller than or equal to 0.15, and 0.01 is smaller than or equal to q which is smaller than or equal to 0.04. Multielement compositions of Na, Ga, alkaline-earth metals, Mn and the like are adopted, crystalline field of the fluorescent powder is optimally regulated, high temperature sintering is performed by adopting special composition additives, position of an emission peak can be regulated, 500-525nm short wavelength range is obtained, pure simple phase can be obtained, light intensity and crystallization degree of the fluorescent powder are greatly improved, requirements of white-light LED (light-emitting diode) on high-temperature thermal quenching performance and anti-humid hot property can be well met, and meanwhile, production yield is further increased.

Description

technical field [0001] The invention relates to a green fluorescent powder and a preparation method thereof, in particular to a high-efficiency and stable short-wavelength silicate green fluorescent powder, a preparation method and application thereof. Background technique [0002] At present, the mainstream white light LED uses InGaN blue light chips to excite YAG:Ce 3+ Phosphor powder produces yellow light complementary to blue light and then mixed to achieve. However, since YAG:Ce 3+ The spectral energy of red light in phosphor powder accounts for about 8-15% of the total spectral energy, which is far lower than the proportion of yellow-green light. The color rendering index of products manufactured by this method is low (generally around 70), and the color temperature is high (basically Above 5500K), there is a certain deviation from the best visual requirements of the human eye (3000-5000K), so it cannot be used for home lighting. To this end, the researchers provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/62H01L33/50
CPCC09K11/7734H01L33/50H01L2933/0041Y02B20/00
Inventor 杨志平路亚娟赵金鑫
Owner HEBEI LIFU CHEM TECH