CN101148588A

CN101148588A - Rare earth aluminate cyan fluorescent powder used for high color rendering property energy-saving lamp and its preparation method and use

Info

Publication number: CN101148588A
Application number: CNA2007100361230A
Authority: CN
Inventors: 刘清玲; 蒋葵明
Original assignee: HUNAN STEADY NEW MATERIAL CO Ltd
Current assignee: HUNAN STEADY NEW MATERIAL CO Ltd
Priority date: 2007-11-12
Filing date: 2007-11-12
Publication date: 2008-03-26
Anticipated expiration: 2027-11-12
Also published as: CN100526422C

Abstract

The present invention is blue-green phosphor powder of RE aluminate for high color developing property energy saving lamp and its preparation process and use. The RE aluminate hst molecular expression of SrMg2Al14O25:Eu2+, and main emitting peak at 480 nm. It is prepared through one high temperature solid phase process with the materials alumina, strontium carbonate, europia and magnesia in the weight ratio of 0.7 to 0.21 to 0.028 to 0.05. It may be excited with 250-300 nm ultraviolet ray to emit blue and green light at high efficiency. It has simple preparation process suitable for industrial production. It is applied in making fluorescent lamp through cooperation with other phosphor powder.

Description

A kind of rare earth aluminate cyan fluorescent powder used for high color rendering property energy-saving lamp and preparation method thereof and purposes

Technical field

The invention belongs to rare earth luminescent material field, particularly a kind of rare earth aluminate cyan fluorescent powder used for high color rendering property energy-saving lamp and preparation method thereof.The invention still further relates to the purposes of this product.

Background technology

Color developing is an important technology index of luminescent lamp, with colour rendering index Ra (0-100) expression.General incandescent light and daylight all have very high colour rendering index, and Ra reaches 100, is full spectrum at the 380-780nm visible light wave range.In the ordinary course of things, also can be with it as relative mark Huaihe River to the evaluation of making comparisons of the color developing of luminescent lamp.

The research report is arranged in recent years: the people is under natural light or imitative natural lighting, and energy raising work, learning efficiency are of value to physically and mentally healthy, keep good visual effect, and therefore, 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.The spectrum of luminescent lamp is mainly by two parts---and the spectrum of fluorescent material emission and mercury are formed at the emission light of visible region (405,436,545,578nm).The luminescent lamp of making by calcium halophosphate activated by antimony andmanganese in the prior art, its spectrum red radiation deficiency, bluish voilet radiation surplus, colour rendering index Ra is at 60-70, and light efficiency is lower.By rare-earth trichromatic fluorescent powder: Y ₂O ₃: Eu (λ _Main=611nm), BaMgAl ₁₀O ₁₇: Eu (λ _Main=450nm) and (CeTb) MgAl ₁₁O ₁₉(λ _Main=545nm) three narrow bands according to a certain percentage, the straight type luminescent lamp Ra that makes the 2300-8000K different-colour can reach 85, and very high light efficiency is arranged.As T ₅The 35W6500K luminescent lamp has reached Ra=85, and light efficiency is 100 lumens/watt (calendar year 2001 commodity).The various compact electricity-saving lamp that the tricolor powder of being made up of above-mentioned three kinds of fluorescent material is made, general colour rendering index Ra also can 〉=80.But the colour rendering index Ra of high colour temperature (6400K) compact type energy-saving lamp then often about 78, is difficult to surpass 80.This mainly is owing to the blue green light of 480-520nm in the spectrum of the tricolor powder of above-mentioned three kinds of fluorescent material composition and not enough greater than the ruddiness of 620nm.In order to improve the color developing of high colour temperature electricity-saving lamp,, begin to release BaMgAl at 20th century the mid-80 ₁₀O ₁₇: Eu, this fluorescent material of Mn, it had both had the Eu of 450nm ²⁺Radiation, and Eu ²⁺Energy efficient can also be passed to Mn ²⁺, by Mn ²⁺Produce λ _MainThe radiation of=515nm, 450nmEu ²⁺Radiation and 515nmMn ²⁺The radiating intensity can be by the concentration control of Eu in the molecular composition and Mn.General stronger 450nm peak and the more weak 515nm peak all made, control chromaticity coordinates y is commonly called as doublet blue powder between 0.12-0.16.By the blue powder component of doublet blue powder as tricolor powder, owing to increased the spectrum component of 480-520nm, the colour rendering index of various compact type energy-saving lamps is improved, particularly the Ra of the electricity-saving lamp of the high colour temperature of colour temperature 6400K also reaches more than 80, and the Ra that has realized compact type energy-saving lamp comprehensively＞80; Thereby BaMgAl ₁₀O ₁₇: Eu, the Mn doublet blue powder has obtained applying.

Yet Y ₂O ₃: Eu rouge and powder, (CeTb) MgAl ₁₁O ₁₉Green powder, BaMgAl ₁₀O ₁₇: Eu or BaMgAl ₁₀O ₁₇: Eu, the tricolor powder that Mn blue powder is formed 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

In order to solve above-mentioned existing deficiency, the purpose of this invention is to provide a kind of rare earth aluminate cyan fluorescent powder used for high color rendering property energy-saving lamp.

Another object of the present invention provides the preparation method of this high-color rendering rare earth aluminate blue-green fluorescent powder.

Another purpose of the present invention provides the purposes of high-color rendering rare earth aluminate blue-green fluorescent powder.

The molecule of high-color rendering rare earth aluminate blue-green fluorescent powder of the present invention is: SrMg ₂Al ₁₄O ₂₅: Eu ²⁺

The preparation method of high-color rendering rare earth aluminate blue-green fluorescent powder of the present invention may further comprise the steps:

1) takes by weighing Al ₂O ₃100g, SrCO ₃20g～32g, Eu ₂O ₃3.2～4.3g, MgO 6～7.5g, the fusing assistant BaF of adding 0.2～0.5% ₂Or H ₃BO ₃, (each raw material weight ratio is: aluminum oxide 60～75%, Strontium carbonate powder 16～25%, europium sesquioxide 2～3.5%, magnesium oxide 4～8%) obtains mixture and mixes;

2) mixed raw material is put into aire tunnel kiln 1500～1550 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.

The preparation of high-color rendering rare earth aluminate blue-green fluorescent powder of the present invention, each raw material preferred weight ratio is: aluminum oxide: Strontium carbonate powder: europium sesquioxide: magnesium oxide=0.7: 0.21: 0.028: 0.05

Rare earth aluminate blue-green fluorescent powder of the present invention can send efficient blue green light efficiently by 250～300nm ultraviolet excitation, and the emission main peak is used for high-color rendering luminescent lamp good stability, luminous intensity height at 480nm.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 chemical formula SrMg of rare earth aluminate blue-green fluorescent powder ₂Al ₁₄O ₂₅: Eu ²⁺Take by weighing Al ₂O ₃100g, SrCO ₃20g～32g, Eu ₂O ₃3.2g～4.3g, MgO 6g～7.5g, the fusing assistant BaF of adding 0.2～0.5% ₂Or H ₃BO ₃, obtain mixture and mix; Mixed raw material is put into aire tunnel kiln 1500～1550 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 480nm.

The preparation of high-color rendering rare earth aluminate blue-green fluorescent powder of the present invention, each raw material preferred weight ratio is: aluminum oxide: Strontium carbonate powder: europium sesquioxide: magnesium oxide=0.7: 0.21: 0.028: 0.05.

With rare earth aluminate SrMg of the present invention ₂Al ₁₄O ₂₅: Eu ²⁺Blue-green fluorescent powder adds (SrMg) ₃(PO ₄) ₂: the orange red toner of Sn (bluish-green powder 30～60%, orange red toner 40～70%), be mixed with high colour developing fluorescent material, can be made into colour temperature 4200K～7500K, the straight type luminescent lamp of Ra 〉=95.

In compact type energy-saving lamp because stronger short-wave ultraviolet radiation arranged; Available

Rare-earth trichromatic Y ₂O ₃: Eu rouge and powder 20～30%, (CeTb) MgAl ₁₁O ₁₉Green powder 15～20%,

BaMgAl ₁₀O ₁₇: Eu blue powder 3～8%, (SrMg) ₃(PO ₄) ₂: the orange red toner fluorescent material 6～20% of Sn,

Add SrMg of the present invention ₂Al ₁₄O ₂₅: Eu ²⁺Blue-green fluorescent powder 35～50% can be made into colour temperature 4200K～6500K, the compact fluorescent lamp that Ra 〉=90 are above.

Claims

1. rare earth aluminate cyan fluorescent powder used for high color rendering property energy-saving lamp, it is characterized in that: the molecular formula of described blue-green fluorescent powder is: SrMg ₂Al ₁₄O ₂₅: Eu ²⁺

2. rare earth aluminate blue-green fluorescent powder according to claim 1 is characterized in that, it is 480nm 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 ₃20～32g, Eu ₂O ₃3.2～4.3g, MgO 6～7.5g, the fusing assistant BaF of adding 0.2～0.5% ₂Or H ₃BO ₃, (each raw material weight ratio is: aluminum oxide 60～70%, Strontium carbonate powder 16～25%, europium sesquioxide 2～3.5%, magnesium oxide 4～8%) obtains mixture and mixes;

(2) mixed raw material is put into aire tunnel kiln 1500～1550 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, 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 3, it is characterized in that: each raw material preferred weight ratio is: aluminum oxide: Strontium carbonate powder: europium sesquioxide: magnesium oxide is 0.7: 0.21: 0.028: 0.05.

5. the purposes of rare earth aluminate blue-green fluorescent powder according to claim 1 is characterized in that: use rare earth aluminate SrMg ₂Al ₁₄O ₂₅: Eu ²⁺Blue-green fluorescent powder adds (SrMg) ₃(PO ₄) ₂: the orange red toner of Sn (bluish-green powder 30～60%, orange red toner 40～70%), be mixed with high colour developing fluorescent material, can be made into colour temperature 4200K～7500K, the straight type luminescent lamp of Ra 〉=95.

6. the purposes of rare earth aluminate blue-green fluorescent powder according to claim 1 is characterized in that: use

Rare-earth trichromatic Y ₂O ₃: Eu rouge and powder 20～30%, (CeTb) Mg Al ₁₁O ₁₉Green powder 15～20%,

Add rare earth aluminate blue-green fluorescent powder 35～50% of the present invention, can be made into colour temperature 4200K～6500K, the compact fluorescent lamp that Ra 〉=90 are above.