CN101914380A - Rare earth aluminate blue-green fluorescent powder and preparation method thereof - Google Patents

Abstract

The invention belongs to the field of luminous materials and discloses rare earth aluminate blue-green fluorescent powder with stable performance, high luminous intensity and 490nm emission main peak. The rare earth aluminate blue-green fluorescent powder has a molecular formula of SrBaMgAl10O17:Eu and comprises the following raw materials in percentage by weight: 45-55 percent of alumina, 25-35 percent of strontium carbonate, 15-20 percent of barium carbonate, 3-5 percent of magnesium oxide and 1-3 percent of europium oxide. A preparation method of the rare earth aluminate blue-green fluorescent powder is a high temperature solid phase method, the optimal weight ratio of the raw materials of the aluminate the strontium carbonate the barium carbonate the magnesium oxide and the europium oxide is 0.46:0.28:0.18:0.04:0.017, and the rare earth aluminate blue-green fluorescent powder can be excited by 250-300nm ultraviolet light to emit high-efficiency blue and green lights, wherein the emission main peak is 485nm. The rare earth aluminate blue-green fluorescent powder has the advantages of simple and mature preparation process and easy realization of industrialization, thereby being excellent blue and green components in high color development fluorescent powder.

Description

A kind of rare earth aluminate blue-green fluorescent powder and preparation method thereof

Technical field

The invention belongs to rare earth luminescent material field, particularly a kind of rare earth aluminate Eu activated blue-green fluorescent powder and preparation method thereof.

Background technology

The color developing of lighting source more and more is subject to people's attention.Especially some particular place, as dyeing industry, the lighting source colour temperature of the color evaluation of multicolor printing industry is the luminescent lamp of 5000K, 6500K, not only general colour rendering index Ra requires＞95, and R ₉-R ₁₄Each special colour rendering index also requires＞and 90.The lighting source in places such as beauty treatment, market, hospital requires also like this, as the luminescent lamp that uses common fluorescent material to make is difficult to reach the high-color rendering of above-mentioned requirements.

The color developing of the emmission spectrum decision luminescent lamp of luminescent lamp.And existing Y ₂O ₃: Eu (λ _Main=611nm) rouge and powder, (CeTb) Mg Al ₁₁O ₁₉(λ _Main=545nm) green powder, BaMgAl ₁₀O ₁₇: Eu (λ _Main=450nm) or BaMgAl ₁₀O ₁₇: Eu, Mn (λ _Main=450nm, 515nm) tricolor powder of blue powder composition still fails to make the compact type energy-saving lamp of Ra 〉=90 and the straight type luminescent lamp of Ra 〉=95 so far.There are some researches show: as long as in the luminescent lamp 405, the mercury radiation of 436nm do not reduce, the above ruddiness of the blue green light of wavelength 480-520nm and 620nm does not strengthen, and is difficult to realize Ra 〉=90 of compact type energy-saving lamp and Ra 〉=95 of straight type luminescent lamp.

Summary of the invention

The purpose of this invention is to provide a kind of stable performance, luminous intensity height, the emission main peak is at the rare earth aluminate blue-green fluorescent powder of 485nm.

Another object of the present invention provides a kind of preparation method of Eu activated rare earth aluminate blue-green fluorescent powder.

The molecule of Eu activated rare earth aluminate blue-green fluorescent powder of the present invention is: SrBaMgAl ₁₀O ₁₇: Eu

The preparation method of Eu co-activation rare earth aluminate blue-green fluorescent powder of the present invention may further comprise the steps:

(1) takes by weighing Al ₂O ₃100g, SrCO ₃50g-70g, BaCO ₃35g-45g, MgO ₂8g-10g, Eu ₂O ₃3g-5g adds the fusing assistant BaF of 0.1-0.3% ₂Or H ₃BO ₃, (each raw material weight ratio is: aluminum oxide 45-55%, Strontium carbonate powder 25-35%, barium carbonate 15-20%, magnesium oxide 3-5%, europium sesquioxide 1-3%) obtains mixture and mixes;

(2) mixed raw material is put into aire tunnel kiln 1450-1500 degree calcination 2～4 hours, taken out and be cooled to room temperature;

(3) powder with calcination pulverized 50 mesh sieves;

(4) will sieve good powder and put into hydrogen reducing furnace 1400～1450 degree calcinations 2～4 hours, and take out and be cooled to room temperature, obtain work in-process, indexs such as test relative brightness, emission main peak, granularity;

(5) work in-process are pulverized, scalping washing, wet screening, centrifugal, dried 100 mesh sieves, the test synthesis data obtain finished product.

The preparation of Eu activated aluminate green emitting phosphor of the present invention, each raw material preferred weight ratio is an aluminum oxide: Strontium carbonate powder: barium carbonate: magnesium oxide: europium sesquioxide=0.46: 0.28: 0.18: 0.04: 0.017.

The rare-earth activated aluminate blue-green fluorescent powder of Eu of the present invention can send efficient blue green light efficiently by the 250-300nm ultraviolet excitation, and the emission main peak is used for luminescent lamp good stability, luminous intensity height at 485nm.Preparation technology is simple, be easy to industrialization, so the present invention is a good blue-greenish colour component in the high colour developing fluorescent material.

Embodiment

Below the present invention is done a detailed description:

The molecule of Eu activated rare earth aluminate blue-green fluorescent powder is: SrBaMgAl ₁₀O ₁₇: Eu takes by weighing Al ₂O ₃100g, SrCO ₃50g-70g, BaCO ₃35g-45g, MgO ₂8g-10g, Eu ₂O ₃3g-5g adds the fusing assistant BaF of 0.1-0.3% ₂Or H ₃BO ₃, (each raw material weight ratio is: aluminum oxide 45-55%, Strontium carbonate powder 25-35%, barium carbonate 15-20%, magnesium oxide 3-5%, europium sesquioxide 1-3%) obtains mixture and mixes; Mixed raw material is put into aire tunnel kiln 1450～1500 degree calcinations 2～4 hours, take out and be cooled to room temperature; The powder of calcination was pulverized 50 mesh sieves; The powder that sieve is good is put into hydrogen reducing furnace 1400～1450 degree calcinations 2～4 hours, taking-up is cooled to room temperature, obtain work in-process and test indexs such as relative brightness, emission main peak, granularity, with work in-process pulverize, scalping washing, wet screening, centrifugal, dried 100 mesh sieves, the test synthesis data obtain finished product.Testing its emission main peak with the fluorescence spectrum tester is 485nm.

The preparation of Eu activated aluminate green emitting phosphor of the present invention, each raw material preferred weight ratio is an aluminum oxide: Strontium carbonate powder: barium carbonate: magnesium oxide: europium sesquioxide=0.46: 0.28: 0.18: 0.04: 0.017.

Claims (4)

1. Eu activated rare earth aluminate blue-green fluorescent powder, it is characterized in that: the molecular formula of described blue-green fluorescent powder is: SrBaMgAl ₁₀O ₁₇: Eu.

2. rare earth aluminate blue-green fluorescent powder according to claim 1 is characterized in that, it is 485nm that fluorescence spectrum is tested its emission main peak.

3. the preparation method of rare earth aluminate blue-green fluorescent powder according to claim 1, it is characterized in that: described method steps comprises:

(1) takes by weighing Al ₂O ₃100g, SrCO ₃50g-70g, BaCO ₃35g-45g, MgO ₂8g-10g, Eu ₂O ₃3g-5g adds the fusing assistant BaF of 0.1-0.3% ₂Or H ₃BO ₃, promptly the raw material weight ratio is: aluminum oxide 45-55%, and Strontium carbonate powder 25-35%, barium carbonate 15-20%, magnesium oxide 3-5%, europium sesquioxide 1-3% mixes each raw material.

(2) mixed raw material is put into aire tunnel kiln 1450～1500 degree calcinations 2～4 hours, taken out and be cooled to room temperature;

(3) powder with calcination pulverized 50 mesh sieves;

(4) will sieve good powder and put into hydrogen reducing furnace 1400～1450 degree calcinations 2～4 hours, and take out and be cooled to room temperature, obtain work in-process, indexs such as test relative brightness, emission main peak, granularity;

(5) work in-process are pulverized, scalping washing, wet screening, centrifugal, dried 100 mesh sieves, the test synthesis data obtain finished product.

4. the preparation method of rare earth aluminate blue-green fluorescent powder according to claim 1, it is characterized in that: each raw material preferred weight ratio is an aluminum oxide: Strontium carbonate powder: barium carbonate: magnesium oxide: europium sesquioxide=0.46: 0.28: 0.18: 0.04: 0.017.