CN1086407C - Long Persistence and high brightness fluorescent materials and preparation thereof - Google Patents
Long Persistence and high brightness fluorescent materials and preparation thereof Download PDFInfo
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- CN1086407C CN1086407C CN97100694A CN97100694A CN1086407C CN 1086407 C CN1086407 C CN 1086407C CN 97100694 A CN97100694 A CN 97100694A CN 97100694 A CN97100694 A CN 97100694A CN 1086407 C CN1086407 C CN 1086407C
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Abstract
The present invention relates to a luminescent material with long persistence and high brightness and a preparation method thereof, the luminescent material has the general formula of (Sr 0.9995 to 0.998 Eu 0.0005 to 0.002) Al2O4. (Sr 0.9995 to 0.998 Eu 0.0005 to 0.002) O. n (Al1-a-bBbDya) 2O3, wherein a=0.0005 to 0.002, b=0.001 to 0.35, and n=1 to 8. The luminescent material uses SrCO3, alpha-Al2O3, gamma-Al2O3, boron compounds, Eu2O3 and Dy2O3 as raw materials, and uses carbon powder to form a reduction atmosphere. The raw materials which are sufficiently mixed are slowly heated from 400 DEG C to 1250 DEG C to 1600 DEG C in 7 to 10 hours, and an obtained mixture is slowly cooled below 200 DEG C after the temperature of the mixture is kept for 3 to 5 hours; finally, the mixture is crumbled and granulated separately to obtain the luminescent material.
Description
The present invention relates to a kind of long Persistence and high brightness fluorescent materials and preparation method thereof, more specifically say so about with 200nm～450nm ultraviolet ray excited have novel light-emitting material of steady persistence and preparation method thereof.
In the past, the noctilucent material in uses such as dial plate, safe designation plates was with copper activated sulfide, for example zinc sulphide class material (ZnS: Cu).This sulfide absorbs the ultraviolet ray energy of certain wavelength and activates luminous.But the time of persistence of this sulfide is very short, and unstable properties, and photostabilization is poor, produces many problems when practical application, can not be used for the open air basically.Both be used in dial,, can not have satisfied people's needs owing to have only 20～30 minutes its time of persistence.
In order to prolong the time of persistence of this sulfide phosphor material, once adopted and in sulfide, added radioactive substance, the practice of praseodymium (Pr) for example, but adopt the harm of radioactive material confrontation human body, have to take appropriate measures, make used equipment, discharge of wastewater, waste treatment or the like all needs a large amount of expenses, and cause environmental pollution, almost can not use now.
As with the different twinkler of above-mentioned sulfide phosphor material, people have developed a kind of fluorescent material that adds (Eu) of rare earth elements europium in alkaline-earth metal.For example, United States Patent (USP) 3,294, disclosed by divalent europium activated strontium aluminate (SrAl in 699
2O
4: the Eu) invention of fluorescent material.The addition of this invention divalent europium is 2～8mol% of strontium aluminate, is 520nm at ultraviolet ray excited its luminous cutting edge of a knife or a sword wavelength down.It is the another kind of material different with above-mentioned phosphate material that but this fluorescent material does not almost have twilight sunset.
Also have other inventions as fluorescent material.For example English Patent the 1st, 190, and 520 inventions disclosed are a kind of with divalent europium activated fluorescent material, and its general expression is Ba
xSr
yCa
zEu
pAl
12O
19Wherein: x+y+z+p=1, x, y, one or both among the z can be 0,0.1 〉=p 〉=0.001.This fluorescent material is 380nm～440nm at ultraviolet ray excited luminescence peak down.This material remains a kind of fluorescent material that does not almost have twilight sunset, is the another kind of material different with phosphor material.
In recent years, people have developed a kind of light activated luminescent material with steady persistence.For example, Chinese patent application publication number CN1053807A discloses a kind of luminescent material with steady persistence, and its general expression is m (Sr
1-xEu
x) OnAl
2O
3YB
2O
3, wherein: 1≤m≤5,1≤n≤8,0.001≤y≤0.35.The salt that this long after glow luminous material can generate these oxide compounds after with aluminum oxide, strontium oxide, europium sesquioxide, boron oxide or heating is a raw material, with these raw materials after burning till under 1200 ℃～1600 ℃, again in nitrogen, argon reducing atmosphere, reduction under 1000 ℃～1400 ℃ temperature and making.
In addition, at United States Patent (USP) 5,376,303, also to disclose respectively among the flat 8-170076 of Japan special permission, flat 8-127772 communique be the luminescent material with steady persistence that constitutes one of element with boron.
But above-mentioned these long after glow luminous material are about 10 hours time of persistence, and the initial stage briliancy is not high enough, and improving the initial stage briliancy and prolonging time of persistence is the technical task that faces.The present inventor is improving luminescent properties in order to address these problems, and seeks cooperating of new alkaline-earth metal and rare earth element, makes new xln aspect and has carried out a large amount of experiments, has found α type Al
2O
3With γ type Al
2O
3Not same-action when forming crystalline texture, and found this formation condition with xln of property, thus finished luminescent material with steady persistence high brightness of the present invention and preparation method thereof.
Therefore, first purpose of the present invention provides a kind of steady persistence that has, and the novel light-emitting material of high brightness.Second purpose of the present invention provides a kind of manufacture method that adopts simple device, this long Persistence and high brightness fluorescent materials of safety in production.The 3rd purpose of the present invention provides and adopts sending green or blue light and having steady persistence and the luminescent material of high brightness and preparation method thereof of simple device, safety in production.
Above-mentioned purpose of the present invention realizes by following invention.
1. a long Persistence and high brightness fluorescent materials is characterized in that this long Persistence and high brightness fluorescent materials is with following general expression: (Sr
0.9995～0.998Eu
0.0005～0.002) Al
2O
4(Sr
0.9995～0.998Eu
0.0005～0.002) On (Al
1-a-bB
bDy
a)
2O
3
A=0.0005 in the formula～0.002
b＝0.001～0.35
The xln that n=1～8 are represented.
2. above-mentioned 1 desired long Persistence and high brightness fluorescent materials is characterized in that when n=1, this long Persistence and high brightness fluorescent materials has following performance:
(1) proportion: 3.60～3.62
(2) body colour: oyster
(3) Mohs' hardness: 6.2～6.5
(4) glow peak wavelength: 520nm
(5) illuminant colour: green
(6) excitation wavelength: 200～450nm
Briliancy in the time of (7) 30 seconds: 4000med/m
2More than
(8) time of persistence: more than 40 hours
(9) x line diffraction analysis: as shown in Figure 1.
3. above-mentioned 1 long Persistence and high brightness fluorescent materials of being put down in writing is characterized in that when n=2, this long Persistence and high brightness fluorescent materials has following performance:
(1) proportion: 3.69～3.71
(2) body colour: oyster
(3) Mohs' hardness: 7.0～7.5
(4) glow peak wavelength: 489nm
(5) illuminant colour: blue look
(6) excitation wavelength: 200～450nm
Briliancy in the time of (7) 30 seconds: 2000med/m
2More than
(8) time of persistence: more than 60 hours
(9) x line diffraction analysis: as shown in Figure 2.
4. the preparation method of above-mentioned 2 long Persistence and high brightness fluorescent materials of being put down in writing is characterized in that this manufacture method is made of following operation:
With raw material SrCO
3, α type Al
2O
3, γ type Al
2O
3, boron compound, Eu
2O
3, Dy
2O
3Pulverizing the back mixes;
Mixed raw material slowly is warming up to 1250 ℃ from 400 ℃ in the presence of carbon element, the heating-up time is 7～10 hours;
Be incubated 5～3 hours down at 1250 ℃;
From 200 ℃ of 1250 ℃ of slowly cooling systems, temperature fall time is 7～10 hours;
With sintered compact pulverize, gradation.
5. the preparation method of above-mentioned 3 long Persistence and high brightness fluorescent materials of being put down in writing is characterized in that this manufacture method is made of following operation:
With raw material SrCO
3, α type Al
2O
3, γ type Al
2O
3, boron compound, Eu
2O
3, Dy
2O
3Pulverizing the back mixes;
Mixed raw material slowly is warming up to 1600 ℃ from 400 ℃ in the presence of carbon element, the heating-up time is 7～10 hours;
Be incubated 5～3 hours down at 1600 ℃;
Slowly be cooled to 200 ℃ from 1600 ℃, temperature fall time is 7～10 hours;
With sintered compact pulverize, gradation.
Below the present invention is described in detail.
Luminescent material of the present invention is when being subjected to sunlight, luminescent lamp, heat, impact equal excitation, and the energy that xln itself is had comes out with the form slow release of visible light, can have the luminescent material of long after-glow.Luminescent material of the present invention can be used general expression: (Sr
0.9995-0.998Eu
0.0005～0.002) Al
2O
4(Sr
0.9995～0.998Eu
0.0005～0.002) On (Al
1-a-bB
bDy
a)
2O
3Expression is in the formula: a=0.0005～0.002, b=0.001～0.35, n=1～8.
This luminescent material has steady persistence and high brightness, when n=1, is the luminescent material of the green of sending the 520nm wavelength.When n=2, for sending the blue look luminescent material of 489nm, this is two representational examples of the present invention.
The manufacture method of long Persistence and high brightness fluorescent materials of the present invention is when n=1, with SrCO
3, α type Al
2O
3, γ type Al
2O
3, boron compound, Eu
2O
3, Dy
2O
3Be raw material, behind these raw material separated pulverizing, mix, in the presence of carbon element, raw materials mixed is warming up to 1250 ℃, heating-up time need 7～10 hours from 400 ℃, be incubated 5～3 hours down at 1250 ℃, and then slowly cooling to 200 ℃, need 7～10 hours cooling time, pulverizes then and gradation.When n=2 above-mentioned mixing raw material slowly is warming up to 1600 ℃ from 400 ℃, the heating-up time needs 7～10 hours, 1600 ℃ of insulations 5～3 hours down, is cooled to 200 ℃ then, and need 7～10 hours cooling time.α type Al in the raw material
2O
3With γ type Al
2O
3Mixing by a certain percentage, owing to adopt the carbon element atmosphere sintering, sintering and reduction are finished in same operation, but also to use lower sintering temperature.The steady persistence high-brightness luminous body of manufacture method manufacturing of the present invention has following performance:
When n=1
1) proportion: 3.60～3.62
2) body colour: oyster
3) Mohs' hardness: 6.2～6.5
4) glow peak wavelength: 520nm
5) illuminant colour: green
6) excitation wavelength: 200～450nm
7) briliancy 30 seconds time the: 4000med/m
2More than
8) time of persistence: more than 40 hours
9) x line diffraction analysis: as shown in Figure 1.
When n=2
1) proportion: 3.69～3.71
2) body colour: oyster
3) Mohs' hardness: 7.0～7.5
4) glow peak wavelength: 489nm
5) illuminant colour: blue look
6) excitation wavelength: 200～450nm
7) briliancy 30 seconds time the: 2000med/m
2More than
8) time of persistence: more than 60 hours
9) x line diffraction analysis: as shown in Figure 2.
Long after glow luminous material of the present invention is with Strontium carbonate powder or strontium oxide, the α type Al that cooperates by a certain percentage
2O
3With γ type Al
2O
3, the oxide compound of boron or compound and europium sesquioxide, dysprosium oxide be that raw material forms through sintering, the xln that is generated may be triclinic collection sheet twin crystal.α type Al with certain ratio
2O
3With γ type Al
2O
3Be used just and can reach special-effect of the present invention, α type Al
2O
3Consumption be Al
2O
350%～99% of total amount, γ type Al
2O
3Be Al
2O
350%～1% of total amount is with γ type Al
2O
3: α type Al
2O
3Be best at=10%～20%: 90%～80%.
Long Persistence and high brightness fluorescent materials of the present invention by adjusting the ratio of Sr and Al, can reach the purpose of the emission wavelength that changes long after glow luminous material.Such as, when n=2, emission wavelength is 489nm, and n is big more, and emission wavelength is short more.
The consumption b of boron is 0.001～0.35mol% among the present invention, and the consumption of boron can not play one's part to the full to the steady persistence of luminescent material very little, and as more than 0.35mol% the time, briliancy and twilight sunset are low tendency on the contrary.The consumption a of Dy is 0.0005～0.002mol%, and what of xln hollow hole this consumption depend on, this consumption is to the delicate influence of high briliancy generation of luminescent material.
Long after glow luminous material of the present invention has very high hardness, and its Mohs' hardness can reach 6.2～7.5, is equivalent to agate, even the hardness of emerald.
Below the manufacture method of long after glow luminous material of the present invention is described in detail.The manufacture method of long after glow luminous material of the present invention is made of following operation: with raw material SrCO
3, α type Al
2O
3, γ type Al
2O
3, boron compound, Eu
2O
3, Dy
2O
3Pulverize, thorough mixing is even then, when n=1, well-mixed raw material slowly is warming up to 1250 ℃ by 400 ℃ in the presence of carbon element, and the heating-up time needs 7～10 hours, is incubated 5～3 hours down at 1250 ℃ then; When n=2, well-mixed raw material slowly is warming up to 1600 ℃ by 400 ℃, heating-up time needs 7～10 hours, be incubated 5～3 hours down at 1600 ℃ then, after this slowly be cooled to 200 ℃, temperature fall time needs 7～10 hours, pulverizes then that can obtain can practical luminescent material with gradation.
Activator used in the present invention is Eu.Can or after heating, can generate the salt of europium sesquioxide with the oxide compound of Eu as raw material.Except that europium, can also use other rare earth elements as coactivator.Experiment showed, that dysprosium is very effective to the briliancy that improves luminescent material, is the coactivator that improves the luminescent material briliancy.By using activator and coactivator, make the briliancy of long after glow luminous material that big improvement be arranged.Coactivator can use the oxide compound of rare earth element or generate the salt of these oxide compounds through heating.Can be from La, Ce, Pr, Nd, Sm, Gd, Tb, Ho, Er, Tm, Yb, choosing any one kind of them or several coactivator that is used as long after glow luminous material of the present invention among the Lu.
In the manufacture method of the present invention, at first with α type Al
2O
3With γ type Al
2O
3Mix, order adds Strontium carbonate powder, boron compound, europium sesquioxide and dysprosium oxide in this mixture then, carries out thorough mixing.In the presence of carbon, this mixture slowly is warming up to needed temperature then, under this temperature, kept 5～3 hours, and then slowly cooling.The carbon element that uses among the present invention is carbon dust, and mixed raw material is imbedded carbon dust, causes a kind of reducing atmosphere thereby raw material is not contacted with airborne oxygen.Also can adopt the mixed gas of nitrogen+hydrogen to make reducing atmosphere.When causing reducing atmosphere with carbon dust, safe and economical, be one of feature of the present invention.Heated up lentamente in 7～10 hours in the inventive method, insulation in 5～3 hours and 7～10 hours lentamente cooling be the key character of the inventive method, this is to enter lattice fully for the atom that makes Eu, Dy and boron, thereby form needed crystalline structure, this crystalline structure is determined as according to one's analysis: triclinic(crystalline)system polysynthetic twins structure.Long after glow luminous material of the present invention can be sneaked into printing ink, and resin waits makes luminous printing ink, and luminous resin etc. are as the safety notice or the indicating positions sign at night.For example, be used for road, advertisement, stationery, toy, sports goods, fire service inventory or the like, be subjected to the exciting of sunlight or light after, it is luminous then not need to use any energy to continue at night.The secondary light source that also can be used as the background of liquid crystal, and replace battery to reach the purpose of saving energy weight reduction.
The present invention will be described by the following examples, but these embodiment only are explanations of the present invention, and the present invention is not subjected to the restriction of these embodiment.
In the following embodiments, refer to that briliancy reaches 0.32med/m time of persistence
2Institute's elapsed time, initial stage briliancy refer to sample through 1000lux irradiation 30 minutes, when stopping to shine 30 seconds.
Embodiment 1:n=1
Raw material SrCO
314.73g
α type Al
2O
39.33g
γ type Al
2O
30.10g
H
3BO
3 0.22g
Eu
2O
3 0.035g
Dy
2O
3 0.037g
After above-mentioned raw materials pulverized respectively, mix the crucible of packing into; Put into the electric furnace that is warming up to 400 ℃ after crucible imbedded carbon dust; Temperature in the electric furnace was warming up to 1250 ℃ reposefully from 400 ℃ within 8 hours; 1250 ℃ of insulations 4 hours; Then in 8 hours reposefully with stove in temperature reduce to 200 ℃; Take out crucible; Reduce to room temperature; Pulverize the back with ball mill and promptly obtain long Persistence and high brightness fluorescent materials of the present invention (1) with 200 eye mesh screen gradation.
The result that luminescent material (1) is detected:
Glow peak wavelength: 520nm
Illuminant colour: green
Time of persistence: 40 hours
Initial stage briliancy: 4500med/m
2
Proportion: 3.60
Mohs' hardness: 6.2
XRD analysis: be shown in Fig. 1.
Embodiment 2:n=2
Raw material: SrCO
3147.32g
α type Al
2O
380.63g
γ type Al
2O
314.23g
H
3BO
3 8.44g
Eu
2O
3 0.352g
Dy
2O
3 0.373g
To mix the crucible of packing into behind the above-mentioned raw materials separated pulverizing; Put into the electric furnace that is warming up to 400 ℃ after crucible imbedded carbon dust; Temperature in the electric furnace was warming up to 1250 ℃ from 400 ℃ from 400 ℃ reposefully within 8 hours; 1250 ℃ of insulations 4 hours; Then in 8 hours with stove in temperature reduce to 200 ℃ steadily, lentamente; Crucible is taken out in stove; Reduce to room temperature; Pulverize the back with ball mill and promptly obtain long Persistence and high brightness fluorescent materials of the present invention (2) with 200 eye mesh screen gradation.
Luminescent material (2) is carried out the result of analyzing and testing:
Glow peak wavelength: 520nm
Illuminant colour: green
Time of persistence: 50 hours
Initial stage briliancy: 5300med/m
2
Proportion: 3.62
Mohs' hardness: 6.3
Embodiment 3:n=2
Raw material: SrCO
314.73g
α type Al
2O
313.71g
γ type Al
2O
35.86g
H
3BO
3 0.94g
Eu
2O
3 0.035g
Dy
2O
3 0.075g
To mix the crucible of packing into behind the above-mentioned raw materials separated pulverizing; Put into the electric furnace that is warming up to 400 ℃ after crucible imbedded carbon dust; Temperature in the electric furnace steadily slowly was warming up to 1600 ℃ from 400 ℃ within 8 hours; 1600 ℃ of insulations 4 hours; Then in 8 hours with stove in temperature reduce to 200 ℃ steadily, lentamente; Crucible is taken out in stove; Reduce to room temperature; Pulverize the back with ball mill and promptly obtain long Persistence and high brightness fluorescent materials of the present invention (3) with 200 eye mesh screen gradation.Luminescent material (3) is carried out the result of analyzing and testing:
Glow peak wavelength: 489nm
Illuminant colour: blue look
Time of persistence: 50 hours
Initial stage briliancy: 2100med/m
2
Proportion: 3.7
Mohs' hardness: 7.3
XRD analysis: be shown in Fig. 2.
Embodiment 4:n=2
Raw material: SrCO3 147.32g
α type Al
2O
3156.13g
γ type Al
2O
334.27g
H
3BO
3 16.88g
Eu
2O
3 0.352g
Dy
2O
3 0.746g
With the method manufacturing that above-mentioned raw materials is pressed embodiment (3), obtain long after glow luminous material of the present invention (4).
Luminescent material (4) is carried out the result of analyzing and testing:
Glow peak wavelength: 490nm
Time of persistence: 70 hours
Initial stage briliancy: 2300med/m
2
Comparative example 1:
With raw material SrCO
314.73g
α type Al
2O
39.67g
γ type A1
2O
3Make by the method for embodiment 1 0.51g pulverize the mixing back, resulting sinter is white powder, and is no luminous.
Comparative example 2:
Raw material α type Al
2O
310.03g, γ type Al
2O
30g, all the other raw materials are all identical with embodiment 1, with the identical method manufacturing of embodiment 1.Resulting sintered compact is canescence, and initial stage briliancy 600med/m2 is about 30 minutes time of persistences.
Comparative example 3:
Raw material α type Al
2O
30g, γ type Al
2O
310.03g all the other raw materials are all identical with embodiment 1, with the identical method manufacturing of embodiment 1.Resulting sintered compact is a light green, initial stage briliancy 1100med/m2, about 2 hours of time of persistence.
Long Persistence and high brightness fluorescent materials of the present invention has the technique effect of following excellence:
1) initial stage briliancy height, and persistence is long;
2) safety is not used any radioactive substance, no radiation;
3) manufacture method of long after glow luminous material of the present invention directly uses carbon dust to cause reducing atmosphere, and sintering and reduction are same
One operation is finished, and the simple efficient height of equipment does not have danger, and the material property that burns till is superior.
Brief description of drawings:
Fig. 1 is the X-ray diffraction analysis chart of n=1 in the long Persistence and high brightness fluorescent materials general expression of the present invention.
Fig. 2 is the X-ray diffraction analysis chart of n=2 in the long Persistence and high brightness fluorescent materials general expression of the present invention.
Claims (5)
1. a long Persistence and high brightness fluorescent materials is characterized in that this long Persistence and high brightness fluorescent materials is with following general expression: (Sr
0.9995～0.998Eu
0.0005～0.002) Al
2O
4(Sr
0.9995～0.998Eu
0.0005～0002) On (Al
1-a-bB
bDy
a)
2O
3
A=0.0005 in the formula～0.002
b＝0.001～0.35
The xln that n=1～8 are represented.
2. the desired long Persistence and high brightness fluorescent materials of claim 1 is characterized in that when n=1, this long Persistence and high brightness fluorescent materials has following performance:
(1) proportion: 3.60～3.62
(2) body colour: oyster
(3) Mohs' hardness: 6.2～6.5
(4) glow peak wavelength: 520nm
(5) illuminant colour: green
(6) excitation wavelength: 200～450nm
Briliancy in the time of (7) 30 seconds: 4000med/m
2More than
(8) time of persistence: more than 40 hours
(9) x line diffraction analysis: as shown in Figure 1.
3. the long Persistence and high brightness fluorescent materials put down in writing of claim 1 is characterized in that when n=2, this long Persistence and high brightness fluorescent materials has following performance:
(1) proportion: 3.69～3.71
(2) body colour: oyster
(3) Mohs' hardness: 7.0～7.5
(4) glow peak wavelength: 489nm
(5) illuminant colour: blue look
(6) excitation wavelength: 200～450nm
Briliancy in the time of (7) 30 seconds: 2000med/m
2More than
(8) time of persistence: more than 60 hours
(9) x line diffraction analysis: as shown in Figure 2.
4. the preparation method of the long Persistence and high brightness fluorescent materials put down in writing of claim 2 is characterized in that this manufacture method is made of following operation: with raw material SrCO
3, α type Al
2O
3, γ type Al
2O
3, boron compound, Eu
2O
3, Dy
2O
3Pulverizing the back mixes;
Mixed raw material slowly is warming up to 1250 ℃ from 400 ℃ in the presence of carbon element, the heating-up time is 7～10 hours;
Be incubated 5～3 hours down at 1250 ℃;
Slowly be cooled to 200 ℃ from 1250 ℃, temperature fall time is 7～10 hours;
With sintered compact pulverize, gradation.
5. the preparation method of the long Persistence and high brightness fluorescent materials put down in writing of claim 3 is characterized in that this manufacture method is made of following operation:
With raw material SrCO
3, α type Al
2O
3, γ type Al
2O
3, boron compound, Eu
2O
3, Dy
2O
3Pulverizing the back mixes;
Mixed raw material slowly is warming up to 1600 ℃ from 400 ℃ in the presence of carbon element, the heating-up time is 7～10 hours;
Be incubated 5～3 hours down at 1600 ℃;
Slowly be cooled to 200 ℃ from 1600 ℃, temperature fall time is 7～10 hours;
With sintered compact pulverize, gradation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100694A CN1086407C (en) | 1997-03-14 | 1997-03-14 | Long Persistence and high brightness fluorescent materials and preparation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100694A CN1086407C (en) | 1997-03-14 | 1997-03-14 | Long Persistence and high brightness fluorescent materials and preparation thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1193651A CN1193651A (en) | 1998-09-23 |
| CN1086407C true CN1086407C (en) | 2002-06-19 |
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| CN104178143A (en) * | 2013-05-22 | 2014-12-03 | 海洋王照明科技股份有限公司 | Praseodymium and holmium co-doped aluminate up-conversion luminescent material, and preparation method and application thereof |
| CN104674377A (en) * | 2014-12-05 | 2015-06-03 | 江苏旷达汽车织物集团股份有限公司 | Preparation method of luminescent low-stretch yarn for inner decorating materials for automobile |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079075A (en) * | 1992-01-07 | 1993-12-01 | 菲利浦光灯制造公司 | Low-pressure mercury discharge lamp |
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1997
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079075A (en) * | 1992-01-07 | 1993-12-01 | 菲利浦光灯制造公司 | Low-pressure mercury discharge lamp |
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