CN101157853A - Near ultraviolet or blue-light excited red fluorescence powder and preparation method thereof - Google Patents

Near ultraviolet or blue-light excited red fluorescence powder and preparation method thereof Download PDF

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CN101157853A
CN101157853A CNA2007100563001A CN200710056300A CN101157853A CN 101157853 A CN101157853 A CN 101157853A CN A2007100563001 A CNA2007100563001 A CN A2007100563001A CN 200710056300 A CN200710056300 A CN 200710056300A CN 101157853 A CN101157853 A CN 101157853A
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solution
fluorescent material
deionized water
light
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CN100540629C (en
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孟庆裕
王晓君
狄卫华
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Abstract

The invention relates to a phosphor material which can emit red light, in particular to a red phosphor stimulated by near ultraviolet or blue light and a preparation method thereof. The chemical structural formula of the phosphor is (M<SUB>1-x</SUB>Eu<SUB>x</SUB>)<SUB>2</SUB>WnO<SUB>3(n+1)</SUB>, wherein, Eu<SUP>3+</SUP> is an activator ion, M is Gb, La or Y, x is more than or equal to 0.05 and is less than or equal to 0.2. n is equal to 1 or 2. The preparation method is: the chloride of M and Eu or nitrate is dissolved in deionized water by proportion needed. Na<SUB>2</SUB>WO<SUB>4</SUB> is dissolved in the deionized water and the rare earth solution is dropped into the Na<SUB>2</SUB>WO<SUB>4</SUB> solution and is stirred at the same time. The formed white deposit is separated from precursor solution and is washed by the deionized water and then is dried under 70-90 DEG C. The deposit after being dried is sintered under 800-1000 DEG C and then is cooled and grinded to gain the phosphor needed. The phosphor made by the preparation method can get the red light, the main peak of which is about 612nm, stimulated by the near ultraviolet (395nm) and the blue light (465nm). The phosphor can be matched with near ultraviolet chips and blue light chips and is a novel white light red phosphor used for LED.

Description

Near ultraviolet or blue-light excited red fluorescence powder and preparation method thereof
Technical field
The present invention relates to the phosphor material powder of red-emitting, particularly a kind of near ultraviolet or blue-light excited fluorescent material of launching red light down and preparation method thereof.
Background technology
Energy-saving and environmental protection are main flows of Future Society industrial development.Compare with the incandescent light and the luminescent lamp of present widespread use; the advantage of all many-sides such as energy-conservation, firm, environmental protection is arranged based on the solid-state lighting lamp of LED (Light Emitting Diode), and therefore developing semiconductor lighting helps solving energy dilemma and environmental issue.In order to realize white light LEDs, a kind of relatively more good method is to utilize the light conversion phosphor.The at present common YAG:Ce fluorescent material that mainly is to use GaN base blue LED collocation emission sodium yellow is realized white light emission, but because this white lumination system is to use blue light and yellow light mix to produce the white light effect, so its colour rendering index is bad, can't realize the three primary colours white light emission.And the white light LEDs of near ultraviolet luminescence chip (UV-LED) mainly is to use high-pressure mercury lamp phosphor (Y for example 2O 2But these fluorescent material bad with near ultraviolet chip coupling on excitation wavelength can't be satisfied the needs of white-light illuminating with UV-LED S:Eu).At present, still lack excellent performance on the market, based on the white-light illuminating LED three primary colors fluorescent powder of near ultraviolet or blue LED, especially can be by near-ultraviolet light or blue-light excited red fluorescence powder, this just needs us to seek new and effective red fluorescent powder for white radiation LED.
Summary of the invention
The purpose of this invention is to provide a kind of near ultraviolet or blue-light excited red fluorescence powder and preparation method thereof, this fluorescent material is realized the red light emission under the exciting of near-ultraviolet light (370-405nm) or blue light (450-470nm).
Fluorescent material chemical structural formula of the present invention is (M 1-xEu x) 2W nO 3 (n+1), Eu wherein 3+Be activator ion, M is Gb, La or Y, 0.05≤x≤0.2; N=1 or 2.
X numerical value is low excessively less than fluorescent material brightness in 0.05 o'clock, greater than the significant concn quencher then took place in 0.2 o'clock.
The Eu that the present invention relates to 3+Adulterated tungstate system can effectively be excited the realization red emission by near ultraviolet or blue light, can be used as a kind of novel white-light illuminating LED red fluorescence powder.
Fluorescent material of the present invention adopts the chemical precipitation method preparation, and concrete preparation method is as follows:
A. pressing (M 1-xEu x) 2W nO 3 (n+1)The muriate of the M of proportional quantity and Eu or nitrate are dissolved in the deionized water in the chemical structural formula, are mixed with earth solution.
B. pressing (M 1-xEu x) 2W nO 3 (n+1)The W of proportional quantity is with excessive N a in the chemical structural formula 2WO 42H 2O is dissolved in the deionized water, and arrives suitable numerical value with ammoniacal liquor regulator solution pH value, and by regulating Na 2WO 4The pH value of solution and W 6+With [M 3++ Eu 3+] the ratio of amount, select the value of n in the fluorescent material general formula, that is: work as Na 2WO 4The pH value of solution is greater than 13.5,0.7≤[W 6+]: [M 3++ Eu 3+]≤1 o'clock, n=1 can obtain (M 1-xEu x) 2WO 6Fluorescent material; Work as Na 2WO 4The pH value of solution is 12～13,1.5≤[W 6+]: [M 3++ Eu 3+]≤2 o'clock, n=2 can obtain (M 1-xEu x) 2W 2O 9Fluorescent material.
C. the described earth solution of step a is slowly splashed into the described Na of step b 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to be stirred to reaction carry out fully.
D. white depositions with deionized water wash number time, again throw out centrifugation from water is come out, put into loft drier 70-90 ℃ of down dry a few hours.
E. dried throw out was put into retort furnace 800-1000 ℃ sintering 1 to 2 hour, cooled off then, grind and to obtain required fluorescent material.
Adopt the fluorescent material of the inventive method preparation to excite acquisition main peak down to be positioned at emitting red light about 612nm at near-ultraviolet light (395nm) and blue light (465nm), can mate with the photodiode of near ultraviolet tube core and blue light tube core, be a kind of novel red fluorescent powder for white radiation LED.
Description of drawings
Fig. 1 is embodiment 1 (Gd 0.95Eu 0.05) 2WO 6Fluorescent material (descending) and embodiment 2 (Gd 0.95Eu 0.05) 2W 2O 9Fluorescent material (on) X ray diffracting spectrum.
Fig. 2 is embodiment 1 (Gd 0.95Eu 0.05) 2WO 6Fluorescent material (monitoring emission wavelength lambda em=611nm down) and embodiment 2 (Gd 0.95Eu 0.05) 2W 2O 9The excitation spectrum of fluorescent material (on, monitoring emission wavelength lambda em=613nm).
Fig. 3 is embodiment 1 (Gd 0.95Eu 0.05) 2WO 6Fluorescent material (descending) and embodiment 2 (Gd 0.95Eu 0.05) 2W 2O 9Fluorescent material (on) emmission spectrum under the 395nm near ultraviolet excitation.
Fig. 4 is embodiment 1 (Gd 0.95Eu 0.05) 2WO 6Fluorescent material (descending) and embodiment 2 (Gd 0.95Eu 0.05) 2W 2O 9Fluorescent material (on) emmission spectrum under 465nm is blue-light excited.
Fig. 5 is the graph of relation of value and the light-emitting phosphor intensity of x.
Embodiment
Embodiment 1
(Gd 0.95Eu 0.05) 2WO 6The preparation of fluorescent material
0.3531 gram GdCl 36H 2O (analytical pure) and 0.0183 gram EuCl 36H 2O (analytical pure) dissolves in 20 ml deionized water, is mixed with earth solution.0.3298 gram Na 2WO 42H 2O (analytical pure) is dissolved in 50 ml deionized water, and with ammoniacal liquor regulator solution pH value to 14.Earth solution is slowly splashed into Na 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to stir 30 minutes, reaction is carried out fully.Then white depositions with deionized water wash number time, again loft drier is put in throw out centrifugation from water, 80 ℃ dry 3 hours down.Dried throw out was put into 900 ℃ of sintering of retort furnace 1 hour at last, cooled off then, grind and to obtain (Gd 0.95Eu 0.05) 2WO 6Fluorescent material.This fluorescent material excites acquisition emission main peak to be positioned at 611nm ruddiness at near-ultraviolet light (395nm) and blue light (465nm).By changing GdCl 36H 2O and EuCl 36H 2The proportioning of O can prepare (the Gd of different x values in order to last method 1-xEu x) 2WO 6Fluorescent material.
Following surface curve among Fig. 1 is the X ray diffracting spectrum of the prepared fluorescent material of this embodiment.
Following surface curve among Fig. 2 is the excitation spectrum (monitoring emission wavelength lambda em=611nm) of the prepared fluorescent material of this embodiment.
Following surface curve among Fig. 3 is the emmission spectrum of the prepared fluorescent material of this embodiment under the 395nm near ultraviolet excitation.
Following surface curve among Fig. 4 is the emmission spectrum of the prepared fluorescent material of this embodiment under 465nm is blue-light excited.
Solid line in the accompanying drawing 5 has shown the value and (Gd of x 1-xEu x) 2WO 6The relation of light-emitting phosphor intensity.
Embodiment 2
(Gd 0.95Eu 0.05) 2W 2O 9Preparation
0.3531 gram GdCl 36H 2O (analytical pure) and 0.0183 gram EuCl 36H 2O (analytical pure) dissolves in 20 ml deionized water, is mixed with earth solution.0.4948 gram Na 2WO 42H 2O (analytical pure) is dissolved in 50 ml deionized water, and with ammoniacal liquor regulator solution pH value to 12.5.Earth solution is slowly splashed into Na 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to stir 30 minutes, reaction is carried out fully.Then white depositions with deionized water wash number time, again loft drier is put in throw out centrifugation from water, 80 ℃ dry 3 hours down.Dried throw out was put into 900 ℃ of sintering of retort furnace 1 hour at last, cooled off then, grind and to obtain (Gd 0.95Eu 0.05) 2W 2O 9Fluorescent material.This fluorescent material excites acquisition emission main peak to be positioned at 613nm ruddiness at near-ultraviolet light (395nm) and blue light (465nm).By changing GdCl 36H 2O and EuCl 36H 2The proportioning of O can prepare (the Gd of different x values in order to last method 1-xEu x) 2W 2O 9Fluorescent material, the dotted line in the accompanying drawing 5 have shown the value and (Gd of x 1-xEu x) 2W 2O 9The relation of light-emitting phosphor intensity.
Last surface curve among Fig. 1 is the X ray diffracting spectrum of the prepared fluorescent material of this embodiment.
Last surface curve among Fig. 2 is the excitation spectrum (monitoring emission wavelength lambda em=613nm) of the prepared fluorescent material of this embodiment.
Last surface curve among Fig. 3 is the emmission spectrum of the prepared fluorescent material of this embodiment under the 395nm near ultraviolet excitation.
Last surface curve among Fig. 4 is the emmission spectrum of the prepared fluorescent material of this embodiment under 465nm is blue-light excited.
Dotted line in the accompanying drawing 5 has shown the value and (Gd of x 1-xEu x) 2W 2O 9The relation of light-emitting phosphor intensity.
Embodiment 3
(La 0.95Eu 0.05) 2WO 6Preparation
0.3478 gram LaCl 36H 2O (analytical pure) and 0.0183 gram EuCl 36H 2O (analytical pure) dissolves in 20 ml deionized water, is mixed with earth solution.0.2961 gram Na 2WO 42H 2O (analytical pure) is dissolved in 50 ml deionized water, and with ammoniacal liquor regulator solution pH value to 13.5.Earth solution is slowly splashed into Na 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to stir 30 minutes, reaction is carried out fully.Then white depositions with deionized water wash number time, again loft drier is put in throw out centrifugation from water, 70 ℃ dry 4 hours down.Dried throw out was put into 800 ℃ of sintering of retort furnace 2 hours at last, cooled off then, grind and to obtain (La 0.95Eu 0.05) 2WO 6Fluorescent material.This fluorescent material excites acquisition emission main peak to be positioned at 611nm ruddiness at near-ultraviolet light (395nm) and blue light (465nm).By changing LaCl 36H 2O and EuCl 36H 2The proportioning of O can prepare (the La of different x values in order to last method 1-xEu x) 2WO 6Fluorescent material, its concentration quenching situation and (Gd 1-xEu x) 2WO 6In approximate.
Embodiment 4
(La 0.95Eu 0.05) 2W 2O 9Preparation
0.3478 gram LaCl 36H 2O (analytical pure) and 0.0223 gram EuCl 36H 2O (analytical pure) dissolves in 20 ml deionized water, is mixed with earth solution.0.5607 gram Na 2WO 42H 2O (analytical pure) is dissolved in 50 ml deionized water, and with ammoniacal liquor regulator solution pH value to 12.Earth solution is slowly splashed into Na 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to stir 30 minutes, reaction is carried out fully.Then white depositions with deionized water wash number time, again loft drier is put in throw out centrifugation from water, 90 ℃ dry 2.5 hours down.Dried throw out was put into 1000 ℃ of sintering of retort furnace 1 hour at last, cooled off then, grind and to obtain (La 0.95Eu 0.05) 2W 2O 9Fluorescent material.This fluorescent material excites acquisition emission main peak to be positioned at 613nm ruddiness at near-ultraviolet light (395nm) and blue light (465nm).By changing LaCl 36H 2O and EuCl 36H 2The proportioning of O can prepare (the La of different x values in order to last method 1-xEu x) 2W 2O 9Fluorescent material, its concentration quenching situation and (Gd 1-xEu x) 2W 2O 9In approximate.
Embodiment 5
(Y 0.95Eu 0.05) 2WO 6Preparation
0.383 gram Y (NO 3) 36H 2O (analytical pure) and 0.0183 gram Eu (NO 3) 36H 2O (analytical pure) dissolves in 20 ml deionized water, is mixed with earth solution.0.2308 gram Na 2WO 42H 2O (analytical pure) is dissolved in 50 ml deionized water, and with ammoniacal liquor regulator solution pH value to 13.5.Earth solution is slowly splashed into Na 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to stir 30 minutes, reaction is carried out fully.Then white depositions with deionized water wash number time, again loft drier is put in throw out centrifugation from water, 90 ℃ dry 2.5 hours down.Dried throw out was put into 800 ℃ of sintering of retort furnace 2 hours at last, cooled off then, grind and to obtain (Y 0.95Eu 0.05) 2WO 6Fluorescent material.This fluorescent material excites acquisition emission main peak to be positioned at 611nm ruddiness at near-ultraviolet light (395nm) and blue light (465nm).By changing YCl 36H 2O and EuCl 36H 2The proportioning of O can prepare (the Y of different x values in order to last method 1-xEu x) 2WO 6Fluorescent material, its concentration quenching situation and (Gd 1-xEu x) 2WO 6In approximate.
Embodiment 6
(Y 0.95Eu 0.05) 2W 2O 9Preparation
0.383 gram Y (NO 3) 36H 2O (analytical pure) and 0.0183 gram Eu (NO 3) 36H 2O (analytical pure) dissolves in 20 ml deionized water, is mixed with earth solution.0.6597 gram Na 2WO 42H 2O (analytical pure) is dissolved in 50 ml deionized water, and with ammoniacal liquor regulator solution pH value to 13.Earth solution is slowly splashed into Na 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to stir 30 minutes, reaction is carried out fully.Then white depositions with deionized water wash number time, again loft drier is put in throw out centrifugation from water, 70 ℃ dry 4 hours down.Dried throw out was put into 900 ℃ of sintering of retort furnace 1 hour at last, cooled off then, grind and to obtain (Y 0.95Eu 0.05) 2W 2O 9Fluorescent material.This fluorescent material excites acquisition emission main peak to be positioned at 613nm ruddiness at near-ultraviolet light (395nm) and blue light (465nm).By changing YCl 36H 2O and EuCl 36H 2The proportioning of O can prepare (the Y of different x values in order to last method 1-xEu x) 2W 2O 9Fluorescent material, its concentration quenching situation and (Gd 1-xEu x) 2W 2O 9In approximate

Claims (2)

1. a near ultraviolet or blue-light excited red fluorescence powder, the chemical structural formula that it is characterized in that this fluorescent material is (M 1-xEu x) 2W nO 3 (n+1), Eu wherein 3+Be activator ion, M is Gb, La or Y, 0.05≤x≤0.2; N=1 or 2.
2. method for preparing the described red fluorescence powder of claim 1 is characterized in that may further comprise the steps:
A. being dissolved in the deionized water, be mixed with earth solution by the M of proportional quantity in the described chemical structural formula of claim 1 and muriate or the nitrate of Eu.
B. by the W of proportional quantity in the described chemical structural formula of claim 1 with excessive N a 2WO 42H 2O is dissolved in the deionized water, with ammoniacal liquor regulator solution pH value, and by regulating Na 2WO 4The pH value of solution and W 6+With [M 3++ Eu 3+] the ratio of amount, select the value of n in the fluorescent material general formula, that is: work as Na 2WO 4The pH value of solution is greater than 13.5,0.7≤[W 6+]: [M 3++ Eu 3+]≤1 o'clock, n=1 can obtain (M 1-xEu x) 2WO 6Fluorescent material; Work as Na 2WO 4The pH value of solution is 12～13,1.5≤[W 6+]: [M 3++ Eu 3+]≤2 o'clock, n=2 can obtain (M 1-xEu x) 2W 2O 9Fluorescent material.
C. the described earth solution of step a is slowly splashed into the described Na of step b 2WO 4In the solution, stir simultaneously, generate the adularescent throw out this moment.After earth solution all splashes into, this white suspension liquid is continued to be stirred to reaction carry out fully.
D. white depositions with deionized water wash number time, again throw out centrifugation from water is come out, put into loft drier 70-90 ℃ of down dry a few hours.
E. dried throw out was put into retort furnace 800-1000 ℃ sintering 1 to 2 hour, cooled off then, grind and promptly obtain required fluorescent material.
CNB2007100563001A 2007-11-12 2007-11-12 Near ultraviolet or blue-light excited red fluorescence powder and preparation method thereof Expired - Fee Related CN100540629C (en)

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