CN1441029A - Process for producing green fluoropher for plasma display screen - Google Patents
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Abstract
The present invention relates to a method for producing green fluoropher for PDP (plasma display panel). In detail, said method comprises the steps of mixing ZnO and SiO2 which react to prepare Zn2SiO4, mixing the obtained Zn2SiO4 with MnO to react further to prepare a green fluoropher for PDP. Said method is capable of being used for a green fluoropher for PDP maintaining a luminescence intensity equal to that of a existing green fluoropher for PDP, with reduced reacting time and decay time.
Description
Technical Field
The present invention relates to a method for producing a green phosphor for a PDP (plasma display Panel)More particularly, it relates to the use of ZnO and SiO2Reaction and synthesis of Zn2SiO4Then, Zn is added2SiO4Reacting with MnO to synthesize a green phosphor Zn for PDP2SiO4Mn in the presence of a catalyst.
Prior Art
A Plasma Display Panel (PDP) having a head corner exposed as a next-generation flat panel display device is a display device of a phosphor type obtained by vacuum ultraviolet rays generated by an inert gas discharge, and basically excited by the vacuum ultraviolet rays.
As the green phosphor for PDP, Zn is most widely used2SiO4Mn and the above Zn2SiO4Mn has a small, rotated, triclinic crystal structure (rhombohedral structure, spacer R3). To produce a small rotating ramp structure, Zn2+Ions coordinated to four oxygen atoms, possibly in two mutually different positions, the Zn2+Substituted Mn2+A green phosphor was prepared. At Mn2+Green light is emitted when excited electrons of ion d-orbitals are reduced to the lowest state, since they are forbidden according to selection rules4T1g-6A1gThe decay time of the emitted green light is very long until the luminous intensity is reduced to 10% of the maximum luminous intensityApproximately 30 ms. Since this phosphor has a long decay time of 30ms, which is an element in a moving image, a phosphor having a short decay time is synthesized, which is the core of a phosphor production technology.
Specifically, Zn is practically used2SiO4Mn is required to have a decay time much shorter than the above-mentioned values and within a predetermined range of 0.1ms to 10ms when used as a green phosphor for PDP. Such as decay time 
If the time is too short (<0.1ms), the display device will flicker, and if the decay time is too long (>10ms), the display device will overlap. Moreover, due to the human eye pairSince the persistence time of the view angle of the moving image is 5ms, the decay time is preferably 1 to 5 ms. In the presence of Zn2SiO4In the case of Mn, the energy transfer of the manganese ion is contrary to the selection principle, and therefore, the light emission time is prolonged. However, if the concentration of manganese ions is very high, the decay time tends to be short, and the emission intensity tends to be significantly reduced.
Recently, studies of green phosphors tend to be focused in a direction of increasing the emission intensity while decreasing the decay time. Specifically, studies have been made to adjust the emission intensity and decay time by improving the heat treatment method, using a flux, and utilizing the concentration quenching effect. Furthermore, studies have been conducted to improve the luminous intensity and decay time using auxiliary active agents.
Ba was used according to the research reports of E.van der Kolk and co-workers2+And Ga2+As Zn1.95Mn0.05SiO4The auxiliary active agent of (2) is synthesized into a green phosphor. In this case, the brightness is reduced by about 14% compared with the case where no auxiliary active agent is used, and the decay time at 170nm excitation is reduced from 17ms to 10ms [ Journal of luminescence, 87-89 (2000)], 1246-1249]。
Further, there is a report on a method of performing heat treatment 2 times by pulverizing a raw material after performing heat treatment 1 time [ phosphatandrebook, CRC press, p410 to 411]]Or after 1 heat treatment, performing 2 heat treatments in a reducing atmosphere to increase the luminous intensity [ Journal of the European ceramic Society, 20(2000), 1043-1051]. Further, U.S. Pat. No. 4390449 proposes that NH as a flux be added after 1 heat treatment4After Cl, heat treatment was performed 2 times to increase the luminous intensity. The method comprises removing quenching sites in the phosphor crystal by 2 heat treatments, increasing the number of manganese ions alone by reducing the formation of Mn-Mn pairs, and increasing the luminance [ Journal of the European ceramic society 20(2000), 1043-1051]. If the formation of Mn-Mn pairs increases, the luminescence intensity decreases by the effect of concentration quenching [ J.electrochem.Soc.Vol.140, No.7, 1993]. However, despite the above-mentioned various efforts, theThe problems of decay time and the like have not been solved yet.
In order to solve the above problems, the present inventors first made ZnO and SiO2Reaction to synthesize Zn2SiO4Then, Zn is added2SiO4When a green phosphor for PDP is synthesized by reacting with MnO, the concentration of Mn-Mn pairs on the surface of the phosphor is increased, and the emission intensity can be maintained at the same level or higher as that of the conventional green phosphor for PDP, but the decay time is shortened, thereby completing the present invention.
Problems to be solved by the invention
Accordingly, an object of the present invention is to provide a method for producing a green phosphor for PDP, which can shorten the time for matrix formation reaction by adjusting the composition of raw materials in the matrix synthesis step, and can reduce the decay time while maintaining the emission intensity at a level higher than that of the conventional green phosphor for PDP by allowing the produced matrix to react with manganese as an activator in the 2 nd step.
Specifically, the present invention provides a two-step process for producing a green phosphor for PDP, which comprises reacting ZnO and SiO2Reaction and synthesis of Zn2SiO4And allowing the Zn to stand2SiO4And reacting with MnO. The two-step reaction is carried out in the presence of Zn formed by the first step2SiO4The matrix is doped with manganese as an active agent so as to be on the surface of the particlesThe concentration of Mn-Mn pairs increases.
Brief description of the drawings
FIG. 1 shows that when the molar ratio of manganese is 0.05, the matrix is ZnO: SiO2Sample Zn prepared in a composition ratio of (1.5 to 1.9): 11.95Mn0.05SiO4X-ray diffraction pattern of (a).
FIG. 2 is ZnO to SiO2Sample Zn prepared when the molar ratio of the MnO raw material is 1.7: 1 (0.001-0.09)2-aMnaSiO4(a is 0.001 to 0.1) in terms of an X-ray diffraction pattern.
FIG. 3a shows a green phosphor sample Zn2-aMnaSiO4(a is 0.001 to 0.1) manganese concentration.
FIG. 3b shows a green phosphor sample Zn prepared by the above method2-aMnaSiO4(a is 0.001 to 0.1) and a change in emission intensity and decay time due to the manganese concentration.
FIG. 4 shows ZnO: SiO green phosphor samples produced according to the present invention2And MnO of 1.5: 1.0: 0.041.
Means for solving the invention
In order to achieve the above object, the present invention provides a method for producing a green phosphor for a PDP, comprising:
1) step 1: mixing ZnO and SiO according to the following reaction formula 12Heat treatment is carried out to synthesize Zn2SiO4；
Reaction scheme 1
(wherein 0<x<2)
2) Step 2: mixing the product of step 1 with MnO according to the following reaction formula 2, and heat-treating;
reaction formula 2
(in the formula, z is more than 0 and less than or equal to 0.1, and a is more than 0 and less than or equal to 0.1).
Step 1 is a heat treatment step of 1 time, ZnO and SiO are weighed in the necessary molar ratio2Put into a mortar and ground together with a small amount of acetone. The mixed raw materials are put into an alumina crucible and heated in the air at 1250-1350 ℃ for more than 2 hours. This step, as a process for synthesizing a base for a phosphor, ZnO and SiO2The value of the mixing molar ratio x of less than 2, preferably 1.5 to 1.9, and the reaction productIs Zn2SiO4Particles and particles remaining without entering reactionSmall amount of SiO2。
Heat treatment time in substrate synthesis, based on ZnO to SiO2The composition ratio of (a) to (b) is different. That is, the heat treatment time tends to be longer as x increases. The composition of ZnO can complete the synthesis of the matrix by heat treatment at 1300 ℃ for more than 2 hours when x is 1.5, the heat treatment is more than 3 hours when x is 1.6-1.8, and the heat treatment is more than 5 hours when x is 1.9-2.0.
At the end of the reaction, complete consumption of ZnO by the reaction can be confirmed by absence of ZnO diffraction peaks in the X-ray diffraction pattern using an X-ray Diffractometer (Norelco X-ray Diffractometer). Meanwhile, Zn was confirmed by decreasing the amount of residual silica supplied to the reaction by increasing the mixing ratio of ZnO from 1.5 to 1.9 in the X-ray diffraction pattern2SiO4The structure of (a) is not changed. In other words, ZnO and SiO2Variation of the mixing ratio is known for zincite (willemite) Zn forming a structure of Zn and Si up to 2: 12SiO4There is no effect. It should be noted that the growth of particles is also caused by the increase in the ZnO ratio and the increase in the synthesis time of the matrix, and therefore, the preferable mixing ratio is 1.5 to 1.9 from the viewpoint of the synthesis time of the matrix, which is the finding of the present invention.
Step 2 is a process of adding MnO as a phosphor activator to the product of the step 1 at a certain molar ratio and performing heat treatment 2 times, and the product is Zn(2-a)MnaSiO4. Specifically, MnO was weighed and added to the product obtained in step 1 so that the ratio of Mn to Si in the finally synthesized phosphor became 0.1 or less, and the mixture was mixed in a mortar and reacted at 1250 to 1350 ℃ for 2 hours or more. Preferably, in step 1, ZnO and SiO are mixed2When the synthesis is carried out at a mixing ratio of 1.5 to 1.8, the reaction time at 1300 ℃ in step 2is 2 hours or more, and when the synthesis is carried out at a mixing ratio of 1.9 to 2.0 in step 1, the reaction time in step 2 is 6 hours or more.
Step 2 is a step of adjusting the luminous intensity and decay time of the phosphor with different manganese contents. When the relative intensity of the phosphor obtained by the synthesis and the emission intensity of a commercial product having 147nm was measured by comparing them with each other using a vacuum ultraviolet fluorescence analyzer, it was confirmed that the emission intensity increased proportionally as the concentration of the activator increased when the manganese concentration was low, and the emission intensity decreased when the manganese concentration was further increased. The luminance is independent of the composition ratio of the matrix composite material, and depends only on the composition of the phosphor to be synthesized.
Decay time
When the excitation light emission is carried out at 254nm by using a Rerkin Elmer Xenon Flash lamp, the light emission intensity at 524nm can be measured by the time when the maximum brightness is reduced to 10%. The change in decay time due to the manganese concentration hardly changes at a low manganese concentration, that is, the emission intensity in a region proportional to the manganese concentration. If the manganese concentration is further increased, then in Zn(2-a)MnaSiO4On the particle surface, the possibility of formation of Mn-Mn pairs is increased, and the selection rule is thereby relaxed, and the decay time is shortened.As a result of comparison of the emission intensity and the decay time depending on the Mn ion concentration, it was confirmed that if the Mn ion concentration is increased, the luminance is decreased and the decay time is shortened. In order to match the decay time required for the displaydevice, the manganese concentration must be increased, and therefore, a reduction in luminance must be tolerated. Therefore, it is necessary to find an appropriate amount of manganese concentration, i.e., a concentration having an appropriate decay time while maintaining the original brightness level. Phosphor (Zn) obtained on a substrate synthesized from a plurality of raw material compositions2-aMnaSiO4) In (2), it was found that when a>0.05, the decay time of the present invention
Under 11 ms. Therefore, if the emission intensity is also considered, it is preferable that a be 0.05 to 0.09. Moreover, if practical possible ranges of the luminous intensity and the decay time are considered, it is preferable that z be 0.04<z<0.1.
In the reaction of the step 2, since the phosphor is formed at the site where manganese enters zinc in the crystal structure of the zincite of the matrix, the mixing molar ratio of the reactants and the relative ratio between the elements in the synthesized phosphor are not equal. I.e. in the crystals of zinc silicate oreIn the structure, the ratio of Zn to Si is 2: 1 due to Mn as an activator2+Ion occupying Zn2+In order to maintain the crystal structure of the zincite silicate, Zn2+With Mn2+The ratio of the sum Si must be 2: 1. Therefore, a is expressed by the following equation 1. Digital formula 1
a＝2z/(x+z)
In the above numerical formula 1, a, x and z are the same as those shown in the above reaction formulas 1 and 2.
The green phosphor for PDP of the present invention has a luminous intensity equal to or higher than that of the conventional green phosphor for PDP, and a decay time is shortened. As shown in the following examples, the amount of zinc and the amount of manganese doped in the raw material mixing were adjusted so that the phosphor obtained by synthesis had a relative emission intensity of 70 to 110%, and the decay time of the phosphor was adjusted5.5ms to 22 ms.
According to the literature, the smaller the amount of manganese doped, the greater the brightness but the longer the decay time [ J.electrochem.Soc.Vol.140, No.7, 1993]in a suitable range]The tendency of the green phosphor of the present invention is similar to that of the green phosphor. However, it was confirmed that the phosphor of the present invention has a shorter decay time than the previously reported phosphor having a similar composition. As an example, a conventional green phosphor Zn1.95Mn0.05SiO4Decay time of17ms [ J.Am.Ceram.Soc., 82(10) 2779-2784]；Journal of Luminescence 87～89(2000)1246～1249]In contrast, in the green phosphor Zn of the present invention1.95Mn0.05SiO4In the case (1), the attenuation time is 9.9-11.6 ms, which is obviously shortened.
In addition, in order to prevent Mn by the conventional method2+Is heated in a reducing atmosphere [ j.electrochem.soc., vol.140, No.7, 1993; J.am.Ceram.Soc., 82[10]]2779～2784]；Journal of Luminescence 87～89(2000)，1246～1249]In contrast, in the present invention, oxidation of manganese does not occur even in the airAnd is easy to synthesize.
Examples
The following describes embodiments of the present invention. However, the present invention is not limited to the following examples.
Example 1: raw material composition ratio of ZnO to SiO2Synthesis of Green phosphor at 1.5: 1
Step 1:
mixing ZnO 1.0166g and SiO20.5g was thoroughly mixed in a mortar and placed in a reaction vessel. The crucible containing the reaction mixture was placed in an electric furnace, the temperature was raised to 1300 ℃ over 3 hours and reacted at that temperature for 3 hours.
Step 2:
the amount of the product obtained in the above step 1 was fixed, and the MnO amount was changed and mixed to react. That is, 0.5g of the product obtained in the above stage 1 was mixed with each of 0.0159g of MnO (mixed molar ratio of 0.082), 0.0111g (mixed molar ratio of 0.057), 0.0080g (mixed molar ratio of 0.041), 0.0032g (mixed molar ratio of 0.016), 0.0016g (mixed molar ratio of 0.008), 0.0008g (mixed molar ratio of 0.004), and 0.0002g (mixed molar ratio of 0.001) in a mortar, and then the mixture was put into an electric furnace to react at 1300 ℃ for 2 hours to synthesize a phosphor. These phosphors were measured for their emission characteristics with a vacuum ultraviolet fluorescence analyzer and for decay time with a Xe flash lamp.
The general formula of the synthesized phosphor is shown below.
Zn1.9Mn0.1SiO4
Zn1.93Mn0.07SiO4
Zn1.95Mn0.05SiO4
Zn1.98Mn0.02SiO4
Zn1.99Mn0.01SiO4
Zn1.995Mn0.005SiO4
Zn1.999Mn0.001SiO4
By XRD analysis, it was confirmed that all of the synthesized phosphors had a zincite crystal structure, and 1.5Zn was indicated in FIG. 1. Further, it is known that the phosphor is white, and the manganese charged is doped entirely, and an unoxidized phosphor is synthesized. When manganese is not completely doped, the phosphor is orange. The X-ray diffraction pattern of the phosphor depending on the composition of the doped manganese is shown in fig. 2. In fig. 2, no change in the X-ray diffraction pattern was observed. In other words, the change in the concentration of manganese has no influence on the structure of the phosphor. That is, within the scope of the experiment,the sum of the molar ratios of zinc and manganese, with silica, is precisely reacted at a 2: 1 molar ratio, known to form the normal zinc silicate mineral crystal structure. The excitation spectrum of the synthesized phosphor is shown in fig. 3a, and the comparison of the emission intensity and the decay time is shown in fig. 3 b. Emission intensity and decay time of phosphor according to manganese concentration
Shown in table 1 below. As can be seen from Table 1, Zn1.95Mn0.05SiO4The phosphor of the composition is a light-emitting body satisfying both emission intensity and decay time.
Synthetic phosphor (Zn)1.95Mn0.05SiO4) The result of observation of the particle pattern with a scanning electron microscope is shown in FIG. 4, and the phosphor obtained in FIG. 4 is a particle close to a sphere and has a particle diameter of 5 to 8 μ. Zn made in various compositions1.95Mn0.05SiO4The chromaticity coordinates (CIE1931 chromaticity coordinates) of (B) can be calculated from the emission spectrum and are shown in Table 2 below. As is clear from table 2, the color coordinates are almost the same as those of commercial products, and substantially the same hue of green light.
Example 2: raw material composition ratio of ZnO to SiO2Synthesis of Green phosphor at 1.6: 1
Step 1:
ZnO1.0844g and SiO20.5g was reacted in the same manner as in example 1.
Step 2:
to the product of step 1, 0.0159g of MnO (mixed molar ratio: 0.085), 0.0111g (mixed molar ratio: 0.059), 0.0080g (mixed molar ratio: 0.043), 0.0032g (mixed molar ratio: 0.017), 0.0016g (mixed molar ratio: 0.008), 0.0008g (mixed molar ratio: 0.004), and 0.0002g (mixed molar ratio: 0.001) were added, and a phosphor was synthesized in the same manner as in example 1.
The general formula of the synthesized phosphor was the same as in example 1.
The X-ray diffraction pattern of the synthesized phosphor is shown in FIG. 1 and designated as 1.6Zn, and the phosphor corresponding to the X-ray diffraction pattern is Zn2-aMnaSiO4. The pattern of the excitation spectrum of the synthesized phosphor is similar to that shown in fig. 3a, and the correlation between the emission intensity and the decay time tends to be similar to that shown in fig. 3 b. The luminous intensity and decay time of the synthesized phosphor are shown in table 1 below. The phosphor having emission intensity and decay time as in example 1 above and being practically usable was Zn1.95Mn0.05SiO4. Synthetic phosphor Zn1.95Mn0.05SiO4The color coordinates of (A) are shown in Table 2 below. Compared with commercially available products, there is almost no difference, and green light of substantially the same hue is displayed.
Example 3: raw material composition ratio of ZnO to SiO2Green phosphor 1.7: 1
Step 1:
ZnO1.1521g and SiO20.5g, the reaction was carried out in the same manner as in example 1.
Step 2:
to 0.5g of the reaction product in step 1, 0.0159g of MnO0.0159g (mixed molar ratio of 0.089), 0.0111g (mixed molar ratio of 0.062), 0.0080g (mixed molar ratio of 0.045), 0.0032g (mixed molar ratio of 0.018), 0.0016g (mixed molar ratio of 0.009), 0.0008g (mixed molar ratio of 0.004), and 0.0002g (mixed molar ratio of 0.001) were added, and a phosphor was synthesized in the same manner as in example 1.
The general formula of the synthesized phosphor was the same as in example 1.
The X-ray diffraction pattern of the synthesized phosphor is shown in FIG. 1, and it indicates 1.7Zn, and the phosphor corresponding to the X-ray diffraction pattern is Zn2-aMnaSiO4. The pattern of the excitation spectrum of the synthesized phosphor was the same as that shown in FIG. 3a, and the correlation between the emission intensity and the decay time was shownThe same trend applies to fig. 3 b. The luminous intensity and decay time of the synthesized phosphor are shown in table 1 below. The phosphor satisfying all of the emission intensity and the decay time as in example 1 above was Zn1.95Mn0.05SiO4. Synthetic phosphor Zn1.95Mn0.05SiO4The color coordinates of (A) are shown in Table 2 below. The color of the green light was almost the same as that of the commercially available product.
Example 4: raw material composition ratio of ZnO to SiO2Synthesis of Green phosphor at 1.8: 1
Step 1:
ZnO1.2199g and SiO20.5g, was reacted by the same method as in example 1.
Step 2:
to 0.5g of the reaction product in step 1, 0.0159g of MnO0.0159g (mixed molar ratio of 0.093), 0.0111g (mixed molar ratio of0.064), 0.0080g (mixed molar ratio of 0.047), 0.0032g (mixed molar ratio of 0.019), 0.0016g (mixed molar ratio of 0.009), 0.0008g (mixed molar ratio of 0.005) and 0.0002g (mixed molar ratio of 0.001) were added, and a phosphor was synthesized in the same manner as in example 1.
The general formula of the synthesized phosphor was the same as in example 1.
The X-ray diffraction pattern of the synthesized phosphor is shown in FIG. 1, and it indicates 1.8Zn, and the phosphor corresponding to the X-ray diffraction pattern is Zn2-aMnaSiO4. The pattern of the excitation spectrum of the synthesized phosphor was similar to that shown in FIG. 3a, and the correlation between the emission intensity and the decay time tended to be similar to that shown in FIG. 3 b. The luminous intensity and decay time of the synthesized phosphor are shown in table 1 below. The phosphor satisfying all of the emission intensity and the decay time as in example 1 above was Zn1.95Mn0.05SiO4. Synthetic phosphor Zn1.95Mn0.05SiO4The color coordinates of (A) are shown in Table 2 below. Compared with commercially available products, the color of green light was almost the same as that of commercially available products.
Example 5: raw material composition ratio of ZnO to SiO2Green phosphor 1.9: 1
Step 1:
except ZnO1.2877g and SiO20.5g, reaction time 5 hours apart, the same as in the above examples1 the reaction was carried out in the same manner as described above.
Step 2:
the reaction was carried out in the same manner as in example 1 except that 0.0165g of MnO (mixed molar ratio of 0.10), 0.0132g (mixed molar ratio of 0.08), 0.0116g (mixed molar ratio of 0.07), 0.0099g (mixed molar ratio of 0.06), 0.0082g (mixed molar ratio of 0.05), 0.0066g (mixed molar ratio of 0.04), 0.0033g (mixed molar ratio of 0.02) and 0.0017g (mixed molar ratio of 0.01) were added to 0.5g of the product obtained by the reaction in step 1, and the reaction time was 6 hours.
The general formula of the synthesized phosphor was the same as in example 1.
The X-ray diffraction pattern of the synthesized phosphor is shown in FIG. 1, and it indicates 1.9Zn, and the phosphor corresponding to the X-ray diffraction pattern is Zn1.95Mn0.05SiO4. Synthetic phosphor Zn1.95Mn0.05SiO4The color coordinates of (A) are shown in Table 2 below. Compared with commercially available products, the green light showed substantially the same hue with almost no difference.
TABLE 1
| Zn2-aMnaSiO4 | 1.5Zn | 1.6Zn | 1.7Zn | 1.8Zn | ||||
| a | Relative hair Light intensity (％) | Attenuation of Time of day (ms) | Relative hair Light intensity (％) | Attenuation of Time of day (ms) | Relative hair Light intensity (％) | Attenuation of Time of day (ms) | Relative hair Light intensity (％) | Attenuation of Time of day (ms) |
| 0.1 | 82.2 | 5.5 | 82.5 | 5.6 | 83.4 | 6.0 | - | - |
| 0.07 | 85.2 | 8.1 | 92.2 | 8.4 | 92.7 | 8.4 | 82.7 | 8.4 |
| 0.05 | 97.0 | 11 | 98.4 | 9.9 | 97.0 | 9.9 | 99.2 | 11.6 |
| 0.02 | 104.0 | 17.3 | 110.2 | 17.5 | 109.1 | 14.5 | 103.3 | 17.8 |
| 0.01 | 108.0 | 21.8 | 106.6 | 20.3 | 107.2 | 19.7 | 104.4 | 20.2 |
| 0.005 | 103.0 | 22.9 | 104.0 | 21.3 | 97.0 | 21.6 | 105.2 | 22.0 |
| 0.001 | 95.0 | 23.0 | 95.0 | 21.5 | 90.0 | 23.1 | - | - |
TABLE 2
| Zn1.95Mn0.05SiO4Mixing ratio of | Color coordinate system | |
| x | y | |
| 1.5ZnO∶SiO2∶0.041MnO | 0.2382 | 0.7160 |
| 1.6ZnO∶SiO2∶0.043MnO | 0.2379 | 0.7162 |
| 1.7ZnO∶SiO2∶0.045MnO | 0.2365 | 0.7170 |
| 1.8ZnO∶SiO2∶0.047MnO | 0.2283 | 0.7204 |
| 1.9ZnO∶SiO2∶0.050MnO | 0.2289 | 0.7204 |
| Commercial product | 0.2374 | 0.7170 |
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, ZnO and SiO were mixed4Reacting at a certain molar ratio to synthesize Zn2SiO4Then, Zn is added2SiO4The phosphor is synthesized in a non-reducing atmosphere, and the phosphor is useful as a phosphor for PDP, which has a reduced decay time while maintaining the emission intensity at the same level or higher than that of a conventional green phosphor for PDP.
Claims (4)
1. A method for producing a green phosphor for a PDP, comprising:
1) step 1: mixing ZnO and SiO according to the following reaction formula 12Heat treatment is carried out to synthesize Zn2SiO4，
Reaction formula 1:
(wherein x is more than 0 and less than 2); and the number of the first and second groups,
2) step 2: mixing the product of step 1 with MnO in the following reaction formula 2, heat-treating,
reaction formula 2:
(in the formula, z is more than 0 and less than or equal to 0.1, and a is more than 0 and less than or equal to 0.1).
2. The method according to claim 1, wherein x in the step 1 is 1.5 to 1.9.
3. The method according to claim 1, wherein z and a in the above step 2 are 0.04<z<0.1 and 0.05. ltoreq. a.ltoreq.0.09, respectively.
4. The method as set forth in claim 1, wherein the heat treatment in the above stages 1 and 2 is carried out at a reaction temperature of 1250 ℃ to 1350 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100344727C (en) * | 2005-10-25 | 2007-10-24 | 上海师范大学 | Light color controllable nano fluorophor excitated by windband, and preparation method in low temprature |
| CN100394531C (en) * | 2003-09-26 | 2008-06-11 | 松下电器产业株式会社 | Plasma display and method for producing phosphor used therein |
| CN100421205C (en) * | 2003-09-26 | 2008-09-24 | 松下电器产业株式会社 | Plasma display and method for producing phosphor used therein |
| CN102473570A (en) * | 2010-05-07 | 2012-05-23 | 松下电器产业株式会社 | Plasma display panel |
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| JPH0662944B2 (en) * | 1987-04-28 | 1994-08-17 | 日亜化学工業株式会社 | Method for producing manganese-activated zinc silicate phosphor |
| KR0132282B1 (en) * | 1993-11-11 | 1998-04-14 | 김판재 | Preparation of green emitting fluorescent body |
| US5985196A (en) * | 1998-01-20 | 1999-11-16 | E. I. Du Pont De Nemours And Company | Flash spinning process and flash spinning solution |
| KR100267510B1 (en) * | 1998-09-25 | 2000-11-01 | 김충섭 | A preparing process of green fluorescent body based zinc silicate |
| KR100285273B1 (en) * | 1999-03-06 | 2001-03-15 | 김충섭 | A green fluorescent body based Zn2SiO4 and process for preparing them |
| KR100319488B1 (en) * | 1999-05-29 | 2002-01-05 | 김충섭 | Green fluorescent body based zinc silicate |
-
2002
- 2002-02-28 KR KR10-2002-0010817A patent/KR100456982B1/en not_active IP Right Cessation
- 2002-07-01 CN CN02140367A patent/CN1441029A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394531C (en) * | 2003-09-26 | 2008-06-11 | 松下电器产业株式会社 | Plasma display and method for producing phosphor used therein |
| CN100421205C (en) * | 2003-09-26 | 2008-09-24 | 松下电器产业株式会社 | Plasma display and method for producing phosphor used therein |
| CN100344727C (en) * | 2005-10-25 | 2007-10-24 | 上海师范大学 | Light color controllable nano fluorophor excitated by windband, and preparation method in low temprature |
| CN102473570A (en) * | 2010-05-07 | 2012-05-23 | 松下电器产业株式会社 | Plasma display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20030071219A (en) | 2003-09-03 |
| KR100456982B1 (en) | 2004-11-10 |
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