KR100378006B1 - Method of preparing low-voltage green phosphor - Google Patents
Method of preparing low-voltage green phosphor Download PDFInfo
- Publication number
- KR100378006B1 KR100378006B1 KR10-2001-0002255A KR20010002255A KR100378006B1 KR 100378006 B1 KR100378006 B1 KR 100378006B1 KR 20010002255 A KR20010002255 A KR 20010002255A KR 100378006 B1 KR100378006 B1 KR 100378006B1
- Authority
- KR
- South Korea
- Prior art keywords
- green phosphor
- phosphor
- calcined
- zno
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 15
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 3
- QZQVBEXLDFYHSR-UHFFFAOYSA-N gallium(III) oxide Inorganic materials O=[Ga]O[Ga]=O QZQVBEXLDFYHSR-UHFFFAOYSA-N 0.000 claims description 5
- 108010043121 Green Fluorescent Proteins Proteins 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 230000004907 flux Effects 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910018119 Li 3 PO 4 Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
- -1 first Chemical compound 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/62—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing gallium, indium or thallium
- C09K11/626—Halogenides
- C09K11/628—Halogenides with alkali or alkaline earth metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3286—Gallium oxides, gallates, indium oxides, indates, thallium oxides, thallates or oxide forming salts thereof, e.g. zinc gallate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/661—Multi-step sintering
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Luminescent Compositions (AREA)
Abstract
저전압용 녹색 형광체의 제조 방법에 관한 것으로서, 이 제조 방법은 ZnO, Ga2O3, MnSO4및 KF를 혼합하고; 상기 혼합물을 대기 분위기 하에서 1100 내지 1300℃의 온도로 1차 소성하고; 상기 1차 소성한 물질을 산으로 세정하고; 상기 세정한 물질을 환원 분위기 하에서 800 내지 1100℃의 온도로 2차 소성하는 공정을 포함하는 저전압용 녹색 형광체의 제조 방법을 제공한다.A method for producing a green phosphor for low voltage, the method comprising: mixing ZnO, Ga 2 O 3 , MnSO 4 and KF; The mixture is first calcined at a temperature of 1100 to 1300 ° C. under an atmospheric atmosphere; Washing the first calcined material with an acid; It provides a method for producing a green phosphor for low voltage comprising the step of secondary baking the washed material at a temperature of 800 to 1100 ℃ in a reducing atmosphere.
상기한 방법으로 제조된 녹색 형광체는 휘도가 향상된 형광체이다.The green phosphor prepared by the above method is a phosphor having improved luminance.
Description
[산업상 이용 분야][Industrial use]
본 발명은 저전압용 녹색 형광체의 제조 방법에 관한 것으로서, 더욱 상세하게는 휘도가 우수한 저전압용 녹색 형광체를 제조할 수 있는 저전압용 녹색 형광체의 제조 방법에 관한 것이다.The present invention relates to a method for producing a low voltage green phosphor, and more particularly, to a method for manufacturing a low voltage green phosphor capable of producing a low voltage green phosphor having excellent luminance.
[종래 기술][Prior art]
주로 1kV 이하의 저전압 디스플레이에는 진공 형광 디스플레이(Vaccumm Fluoresent Display: VFD), 필드 에미션 디스플레이(Field Emission Display: FED) 등이 있다.Low voltage displays below 1 kV include vacuum fluorescent displays (VFDs) and field emission displays (FEDs).
이러한 진공 형광 디스플레이 장치 및 필드 에미션 디스플레이 장치에 사용되는 녹색 형광체 중 한 예로 ZnO·Ga2O3매트릭스에 Mn이 도핑된 징크 갈레이트(zinc gallate) 녹색 형광체가 있다.One example of green phosphors used in such vacuum fluorescent display devices and field emission display devices is zinc gallate green phosphors doped with Mn in a ZnO.Ga 2 O 3 matrix.
상기 징크 갈레이트 형광체를 제조하기 위해서는 먼저, ZnO, Ga2O3, MnSO4를혼합한다. 이때, 소성 온도를 낮추고, 결정성을 좋게 하기 위해서 융제(flux)를 사용하며, 융제로는 리튬 포스페이트(Li3PO4), 리튬 카보네이트(Li2CO3), 소디움 포스페이트(Na2HPO3), 칼슘 포스페이트(CaHPO4)를 사용한다.In order to manufacture the zinc gallate phosphor, first, ZnO, Ga 2 O 3, and MnSO 4 are mixed. In this case, a flux is used to lower the firing temperature and improve crystallinity, and as the flux, lithium phosphate (Li 3 PO 4 ), lithium carbonate (Li 2 CO 3 ), and sodium phosphate (Na 2 HPO 3 ) , Calcium phosphate (CaHPO 4 ) is used.
이어서, 이 혼합물을 대기 분위기하, 1200℃에서 3시간 가량 1차 소성한다. 1차 소성시킨 매트릭스를 밀링, 바람직하게는 볼밀함으로써 덩어리진 매트릭스의 입자를 골고루 분산시킨다. 과다한 융제를 제거하기 위하여 분산시킨 매트릭스의 입자를 질산으로 세정한다. 세정된 매트릭스를 환원 분위기하, 1100℃에서 1-3시간 동안 2차 소성한다. 2차 소성된 매트릭스를 시브(sieve)를 사용하여 분급하여 저전압용 녹색 형광체를 제조한다.Subsequently, the mixture is first calcined at 1200 ° C. for about 3 hours in an atmospheric atmosphere. The first calcined matrix is milled, preferably ball milled, to evenly disperse the particles of the agglomerated matrix. The particles of the dispersed matrix are washed with nitric acid to remove excess flux. The washed matrix is secondarily baked at 1100 ° C. for 1-3 hours under a reducing atmosphere. The secondary fired matrix is classified using a sieve to produce a green phosphor for low voltage.
상기 방법으로 제조된 저전압용 녹색 형광체는 네오-그린(Neo-green)으로 시판되며, 종래 사용되던 ZnO:Zn 형광체보다 색순도가 높은 장점이 있으나, 휘도가 낮은 문제점이 있다.The low-voltage green phosphor manufactured by the above method is commercially available as neo-green and has a higher color purity than the conventionally used ZnO: Zn phosphor, but has a low luminance.
본 발명은 상기한 문제점을 해결하기 위한 것으로서, 본 발명의 목적은 휘도가 우수한 저전압용 녹색 형광체의 제조 방법을 제공하는 것이다.The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for producing a green phosphor for low voltage excellent in brightness.
상기 본 발명의 목적을 달성하기 위하여, 본 발명은 ZnO, Ga2O3, MnSO4및 KF를 혼합하고; 상기 혼합물을 대기 분위기 하에서 1100 내지 1300℃의 온도로 1차 소성하고; 상기 1차 소성한 물질을 산으로 세정하고; 상기 세정한 물질을 환원 분위기 하에서 800 내지 1100℃의 온도로 2차 소성하는 공정을 포함하는 저전압용 녹색 형광체의 제조 방법을 제공한다.In order to achieve the object of the present invention, the present invention is to mix ZnO, Ga2O3, MnSO 4 and KF; The mixture is first calcined at a temperature of 1100 to 1300 ° C. under an atmospheric atmosphere; Washing the first calcined material with an acid; It provides a method for producing a green phosphor for low voltage comprising the step of secondary baking the washed material at a temperature of 800 to 1100 ℃ in a reducing atmosphere.
이하, 본 발명의 제조 방법을 상세히 설명한다.Hereinafter, the manufacturing method of the present invention will be described in detail.
ZnO, Ga2O3, MnSO4및 KF를 혼합한다. 이때, ZnO 및 Ga2O3는 동몰량으로 사용하는 것이 바람직하다. ZnO 및 Ga2O3를 동몰량으로 사용하지 않으면, 제조된 형광체의 휘도가 바람직하지 않을 수 도 있다. KF 화합물은 융제(flux)의 역할을 하는 화합물로서, 융제란 형광체의 입경을 성장시키고, 입형을 조절하는 역할을 하는 것을 말한다.Mix ZnO, Ga2O3, MnSO 4 and KF. At this time, ZnO and Ga 2 O 3 is preferably used in equimolar amounts. If ZnO and Ga 2 O 3 are not used in equimolar amounts, the luminance of the produced phosphor may be undesirable. KF compound is a compound that acts as a flux, and flux refers to a function of growing the particle diameter of the phosphor and controlling the shape of the phosphor.
KF의 사용량은 ZnO 및 Ga2O3의 혼합 중량의 0.01 내지 10 중량%, 보다 바람직하게는 0.1 내지 1 중량%인 것이 바람직하다. KF의 사용량이 ZnO 및 Ga2O3의 혼합 중량의 0.01 중량% 미만일 경우에는, 입자 형태가 균일하지 못한 문제점이 있으며, 10중량%를 초과하는 경우에는 휘도가 저하되는 문제점이 있다.The amount of KF used is preferably 0.01 to 10% by weight, more preferably 0.1 to 1% by weight of the mixed weight of ZnO and Ga 2 O 3 . When the amount of KF used is less than 0.01% by weight of the mixed weight of ZnO and Ga 2 O 3 , there is a problem that the particle shape is not uniform, and when it exceeds 10% by weight, there is a problem that the luminance is lowered.
이와 같은 비율로 혼합된 혼합물을 대기 분위기 하에서 1100 내지 1300℃의 온도로 1차 소성한다. 이 소성 공정으로 ZnO·Ga2O3매트릭스가 형성되고, Mn이 이 매트릭스 내부로 도핑된다.The mixture mixed in this ratio is first calcined at a temperature of 1100 to 1300 ° C. under an atmospheric atmosphere. This firing process forms a ZnO.Ga 2 O 3 matrix, and Mn is doped into the matrix.
제조된 매트릭스는 일부가 덩어리로 뭉쳐 있을 수 있으므로 밀링(milling) 공정을 실시하여 균일한 입도를 갖도록 형성한다. 밀링 공정은 볼밀(ball-mill)을 실시하는 것이 응집된 입자를 제거하고 분산성 및 입도 분포를 향상시킬 수 있어바람직하다.Since the prepared matrix may be agglomerated in part, a milling process is performed to form a uniform particle size. The milling process is preferably carried out by ball milling to remove aggregated particles and to improve dispersibility and particle size distribution.
밀링한 물질을 산으로 세정하여 과다한 양의 융제를 제거한다. 산으로는 일반적으로 형광체에서 융제를 제거하기 위해 사용되는 산은 어떠한 것도 사용할 수 있으며, 그 대표적인 예로 약 0.5 N 농도의 질산 또는 약 1% 농도의 염산을 사용할 수 있다.The milled material is washed with acid to remove excess amount of flux. As the acid, any acid generally used to remove the flux from the phosphor may be used. As a representative example, nitric acid at about 0.5 N concentration or hydrochloric acid at about 1% concentration may be used.
질산 또는 염산으로 세정한 물질을 환원 분위기 하에서 800 내지 1100℃의 온도로 2차 소성을 실시한다. 상기 환원 분위기는 H2가스 또는 N2가스를 이용하여 형성할 수 있다. 이 2차 소성 공정으로 인해 징크 갈레이트 형광체의 결정성이 증가되고, 도핑된 Mn이 +4가에서 +2로 환원되어 형광체의 발광 효율이 향상된다.The material washed with nitric acid or hydrochloric acid is subjected to secondary firing at a temperature of 800 to 1100 ° C. under a reducing atmosphere. The reducing atmosphere may be formed using H 2 gas or N 2 gas. Due to this secondary firing process, the crystallinity of the zinc gallate phosphor is increased, and the doped Mn is reduced from +4 to +2, thereby improving the luminous efficiency of the phosphor.
상기 2차 소성된 물질을 시브(sieve)를 사용하여 분급함으로써 저전압용 녹색 형광체를 제조한다.The secondary calcined material is classified using a sieve to produce a green phosphor for low voltage.
이하 본 발명의 바람직한 실시예 및 비교예를 기재한다. 그러나 하기한 실시예는 본 발명의 바람직한 일 실시예일 뿐 본 발명이 하기한 실시예에 한정되는 것은 아니다.Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only one preferred embodiment of the present invention and the present invention is not limited to the following examples.
(실시예 1)(Example 1)
ZnO 1mol, Ga2O3 1mol MnSO40.02mol, KF를 혼합하였다. 이때, KF는 ZnO과 Ga2O3혼합 중량의 0.1 중량%의 양으로 사용하였다. 이 혼합물을 대기 분위기 하에서 1200℃의 온도로 3시간동안 1차 소성하였다. 소성한 물질을 3시간 동안 볼밀을 실시한 후, 1% 농도의 염산으로 세정하였다. 산으로 세정한 물질을 H2가스에서1000℃의 온도로 2시간 동안 2차 소성하였다. 소성된 물질을 분급하여 저전압용 녹색 형광체를 제조하였다.ZnO 1mol, Ga2O3 1mol MnSO 4 0.02mol, KF were mixed. In this case, KF was used in an amount of 0.1% by weight of the mixed weight of ZnO and Ga 2 O 3 . The mixture was first calcined for 3 hours at an temperature of 1200 ° C. under an atmospheric atmosphere. The calcined material was ball milled for 3 hours and then washed with 1% hydrochloric acid. The acid washed material was calcined for 2 hours at a temperature of 1000 ° C. in H 2 gas. The calcined material was classified to prepare a green phosphor for low voltage.
(비교예 1)(Comparative Example 1)
ZnO 1mol, Ga2O3 1mol, MnSO40.02mol, 융제로서 CaHPO40.1 중량%를 혼합하였다. 이 혼합물을 대기 분위기하에서 1200℃의 온도로 3 시간동안 1차 소성하였다. 소성한 물질을 3시간 동안 볼밀을 실시한 후, 0.5N의 질산으로 세정하였다. 세정된 물질을 H2가스에서 1100℃의 온도로 2시간 동안 2차 소성하였다. 소성된 물질을 분급하여 저전압용 녹색 형광체를 제조하였다.As ZnO 1mol, Ga2O3 1mol, MnSO 4 0.02mol, flux was mixed with 0.1% by weight of CaHPO 4. The mixture was first calcined for 3 hours at an temperature of 1200 ° C. under an atmospheric atmosphere. The calcined material was ball milled for 3 hours and then washed with 0.5N nitric acid. The washed material was secondary calcined for 2 hours at a temperature of 1100 ° C. in H 2 gas. The calcined material was classified to prepare a green phosphor for low voltage.
상기 실시예 1 및 비교예에서 제조한 녹색 형광체를 이용하여 VFD를 각각 제조하였다. 제조된 VFD를 필라멘트에 인가되는 교류 전압인 Ef를 3.5 Vac, 애노드와 그리드 전압인 Ebc를 21 Vp-p, Duty는 1/7의 구동 조건으로 구동한 후, 형광체의 휘도를 측정하였다. 그 결과, 실시예 1의 형광체의 휘도는 60 ft-L(foot-lambert)이고, 비교예 1의 형광체의 휘도는 40ft-L이었다.VFDs were prepared using the green phosphors prepared in Example 1 and Comparative Example, respectively. The manufactured VFD was driven at a driving condition of 3.5 Vac for an AC voltage applied to the filament, 21 Vp-p for an anode and grid voltage, and a Duty of 1/7, and then the luminance of the phosphor was measured. As a result, the luminance of the phosphor of Example 1 was 60 ft-L (foot-lambert), and the luminance of the phosphor of Comparative Example 1 was 40 ft-L.
상술한 바와 같이, 본 발명의 형광체는 융제로 KF를 사용함으로써 휘도가 우수하여 발광 효율이 우수한 저전압 표시 장치를 제공할 수 있다.As described above, the phosphor of the present invention can provide a low voltage display device having excellent luminance and excellent luminous efficiency by using KF as a flux.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2001-0002255A KR100378006B1 (en) | 2001-01-15 | 2001-01-15 | Method of preparing low-voltage green phosphor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2001-0002255A KR100378006B1 (en) | 2001-01-15 | 2001-01-15 | Method of preparing low-voltage green phosphor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20020061290A KR20020061290A (en) | 2002-07-24 |
| KR100378006B1 true KR100378006B1 (en) | 2003-03-29 |
Family
ID=27691759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR10-2001-0002255A Expired - Fee Related KR100378006B1 (en) | 2001-01-15 | 2001-01-15 | Method of preparing low-voltage green phosphor |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100378006B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910012178A (en) * | 1989-12-23 | 1991-08-07 | 김정배 | Manufacturing method of green light emitting phosphor |
| KR930004373A (en) * | 1991-08-14 | 1993-03-22 | 다께바야시 쇼오고 | Olefin Polymer Composition |
| KR950011228A (en) * | 1993-10-08 | 1995-05-15 | 김주용 | Automobile Collision Avoidance Device and Its Prevention Method |
| KR950011227A (en) * | 1993-10-06 | 1995-05-15 | 전성원 | How to keep your vehicle safe |
-
2001
- 2001-01-15 KR KR10-2001-0002255A patent/KR100378006B1/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910012178A (en) * | 1989-12-23 | 1991-08-07 | 김정배 | Manufacturing method of green light emitting phosphor |
| KR930004373A (en) * | 1991-08-14 | 1993-03-22 | 다께바야시 쇼오고 | Olefin Polymer Composition |
| KR950011227A (en) * | 1993-10-06 | 1995-05-15 | 전성원 | How to keep your vehicle safe |
| KR950011228A (en) * | 1993-10-08 | 1995-05-15 | 김주용 | Automobile Collision Avoidance Device and Its Prevention Method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20020061290A (en) | 2002-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4116864A (en) | Fluorescent compositions for low-velocity electron excited fluorescent display devices | |
| JP5715242B2 (en) | Method for producing oxide stannate luminescent material | |
| KR100300322B1 (en) | Low-voltage blue phosphor and method of preparing the same | |
| KR100378006B1 (en) | Method of preparing low-voltage green phosphor | |
| KR100315226B1 (en) | A blue phosphor with high brightness for low-voltage applications | |
| KR100285274B1 (en) | A green fluorescent body based gadolinium aluminate and process for preparing them | |
| KR100289158B1 (en) | Low-voltage blue phosphor and its manufacturing method | |
| KR100336973B1 (en) | A red fluorescent body based SrTiO3 used in low voltage and process for preparing them | |
| KR100667923B1 (en) | Manufacturing method of green phosphor for low voltage | |
| KR100449582B1 (en) | Phosphors and their preparation method for field emission display | |
| KR100348967B1 (en) | Blue Luminescence comprising thulium for low voltage cathodoluminescence and manufacturing method thereof | |
| KR100696678B1 (en) | Low voltage blue phosphor and its manufacturing method | |
| KR20000059880A (en) | Method of preparing low-voltage blue phosphor | |
| KR100649242B1 (en) | Manufacturing method of red phosphor for low voltage | |
| KR19990085329A (en) | Strontium titanate-based red phosphor and its manufacturing method | |
| KR100424864B1 (en) | Process for preparing GdOBr green phosphor | |
| KR100369709B1 (en) | Preparation of the red phosphor of gadolinium oxides with two type in structure | |
| KR20000059660A (en) | A red fluorescent body based SrTiO3and process for preparing them | |
| KR19980019750A (en) | Method for producing Y2O3S-based small particle phosphor | |
| KR100419862B1 (en) | The composition of the green phosphor in a GdPO4 system and its preparing method | |
| KR100296874B1 (en) | Low voltage phosphor manufacturing method | |
| KR20010111833A (en) | A green emitting phosphor for low-voltage applications and a method of preparing the same | |
| KR20020065774A (en) | A red emitting phosphor for low-voltage applications and a method of preparing the same | |
| KR20020003886A (en) | Fluorescent Material of Lanthanum Gallate and Method for Producing The Same | |
| KR20030095042A (en) | Compositions of oxy-halides red phosphor and their preparing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 20010115 |
|
| PA0201 | Request for examination | ||
| PG1501 | Laying open of application | ||
| E701 | Decision to grant or registration of patent right | ||
| PE0701 | Decision of registration |
Patent event code: PE07011S01D Comment text: Decision to Grant Registration Patent event date: 20030224 |
|
| GRNT | Written decision to grant | ||
| PR0701 | Registration of establishment |
Comment text: Registration of Establishment Patent event date: 20030317 Patent event code: PR07011E01D |
|
| PR1002 | Payment of registration fee |
Payment date: 20030318 End annual number: 3 Start annual number: 1 |
|
| PG1601 | Publication of registration | ||
| PR1001 | Payment of annual fee |
Payment date: 20060227 Start annual number: 4 End annual number: 4 |
|
| FPAY | Annual fee payment |
Payment date: 20070226 Year of fee payment: 5 |
|
| PR1001 | Payment of annual fee |
Payment date: 20070226 Start annual number: 5 End annual number: 5 |
|
| LAPS | Lapse due to unpaid annual fee | ||
| PC1903 | Unpaid annual fee |