CN1210372C - Single-base multi-photochromic long afterglow phosphorescence body and its preparation method - Google Patents

Single-base multi-photochromic long afterglow phosphorescence body and its preparation method Download PDF

Info

Publication number
CN1210372C
CN1210372C CN 03120806 CN03120806A CN1210372C CN 1210372 C CN1210372 C CN 1210372C CN 03120806 CN03120806 CN 03120806 CN 03120806 A CN03120806 A CN 03120806A CN 1210372 C CN1210372 C CN 1210372C
Authority
CN
China
Prior art keywords
preparation
cdsio
high temperature
phosphorescent substance
photochromic
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
Application number
CN 03120806
Other languages
Chinese (zh)
Other versions
CN1478854A (en
Inventor
刘应亮
雷炳富
叶泽人
张静娴
石春山
易守军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinan University
University of Jinan
Original Assignee
Jinan University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jinan University filed Critical Jinan University
Priority to CN 03120806 priority Critical patent/CN1210372C/en
Publication of CN1478854A publication Critical patent/CN1478854A/en
Application granted granted Critical
Publication of CN1210372C publication Critical patent/CN1210372C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Luminescent Compositions (AREA)

Abstract

The present invention relates to a monobasis multi-photochromic long afterglow phosphorescence body with a composition of CdSiO3: Re<3+>, wherein CdSiO3 is a substrate; Re<3+> is a rare earth active ion. CdCO3 raw materials and SiO2 raw materials are weighed according to a raw material compounding ratio of 1/1; activating agents are weighed according to a molar fraction of 0.1 to 20%; after the materials are thoroughly mixed, the mixture is put into a corundum crucible; the corundum crucible is covered and is fired; products with white body color can be obtained through high temperature discharging and cooling in the air. Strong long afterglow emission of samples can be observed through 254 nm ultraviolet radiation for one minute, and the emission colors are different because of different active ions.

Description

A kind of single-base multi-photochromic long afterglow phosphorescence body and preparation method thereof
Technical field
The present invention relates to a kind of long persistence phosphor, relate in particular to the how photochromic long persistence phosphor of a kind of matrix of a kind of trivalent rare earth ions activated.
The invention still further relates to the preparation method of above-mentioned phosphorescent substance.
Background technology
Long-afterglow material is a kind of energy-conservation low light level illumination and display material.It can be stored in luminous energy in the trap of material self after being subjected to daylight or UV-irradiation, and then slowly energy is discharged to the rare earth activation ion in the material and luminous.Long-afterglow material can be widely used in low light level illumination, energy-saving material, emergent indicating equipment, aspects such as artwork and finishing material.Consider that from angle of practical application people wish to obtain the long after glow luminous material of different photochromic even whole Color Ranges.According to the three primary colors principle,, just can obtain versicolor long-afterglow material as long as the long-afterglow material of three kinds of colors of red, green, blue that similar performance, afterglow intensity and fall time is close mixes by a certain percentage.Up to the present, people do not find as yet and a kind ofly can realize different all luminous luminescent material matrix of Color Range.
Summary of the invention
The purpose of this invention is to provide a kind of single-matrix, different ions activated single-base multi-photochromic long afterglow phosphorescence body.
Another object of the present invention is to provide a kind of preparation method of above-mentioned phosphorescent substance.
For achieving the above object, the invention provides the how photochromic long persistence phosphor of a kind of matrix of a kind of trivalent rare earth ions activated, it consist of: CdSiO 3: Re 3+, wherein, CdSiO 3Be matrix, Re 3+Be rare earth ion.
Re can be selected from Ce, Pr, Sm, Eu, Gd, Tb, Tm, Yb, Y, La, Nd, Ho, Er, any one among the Lu or multiple element.
Above-mentioned long persistence phosphor, it can be stored in luminous energy in the trap of material self after being subjected to UV-irradiation, and then slowly energy is discharged to the rare earth activation ion in the material and luminous.Because CdSiO 3Exist the broad emission band that a stable and very strong wavelength is positioned at 250～400nm in the matrix, different trivalent rare earth ionses has different feature emissions, and these two kinds of emissions that different illumination mode produced mix can obtain different glow colors.
This phosphorescent substance has different photochromic steady persistence emissions through the 254nm UV-irradiation, when can be used for the public place power failure, and the caution of the demonstration of crowd evacuation fire exit, the sign of fire passage and some other specific occasions etc.Prepared single Quito its excitation wavelength of look long persistence phosphor of the present invention is positioned near 250nm～400nm, therefore can also utilize it to make the photochromic steady persistence light fixture of various differences.
The preparation method of this phosphorescent substance is: with cadmium carbonate (CdCO 3) and silicon-dioxide (SiO 2) make base starting material, doping activator Re 3+, thorough mixing is placed in the corundum crucible, adds a cover calcination; Cooling can obtain the white powder product.
Described raw material adopts analytical pure or high-purity cadmium carbonate (CdCO 3), spectroscopically pure or high-purity silicon dioxide, active ions are Re 3+, activator is with oxide compound (Re 2O 3) the form adding, doping content is 0.1-20%.
Calcination temperature is 950～1150 ℃, reaction times 3-6 hour; High temperature is come out of the stove, and cools off in the air.
Shades of colour steady persistence of the present invention produces principle:
Above-mentioned fluor CdSiO 3: Re 3+Because the easy volatile of cadmium metal causes the trap level that exists different depths in the lattice, the while is because CdSiO in sintering procedure 3Be a kind of chain-like structure of low-dimensional, the defective in the lattice more is easy to generate luminous.Under the 254nm UV-irradiation, the defective in the lattice traps extraneous energy, and energy efficient passed to rare earth ion and slowly releases with the form of light, just can produce long twilight sunset.Because at CdSiO 3In the system, very strong and a emission band that can stable existence is arranged near 250～400nm, according to the principle of three primary colours, as long as add suitable active ions, different emissions mix can realize the different photochromic launching effects of single base.Trivalent rare earth ions Re 3+Different feature emission peaks is arranged, so at CdSiO 3: Re 3+Can realize in (Re is selected from Ce, Pr, Sm, Eu, Gd, Tb, Tm, Yb, Y, La, Nd, Ho, Er, any one among the Lu or multiple element) phosphorescent substance that single base is different photochromic long-persistence luminous.
Embodiment
Embodiment 1
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, cerium oxide (CeO 2) 0.207g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum comprises one from 300 to 450nm broadband be positioned at～580nm trivalent Ce 3+Emission band form.Through the 254nm UV-irradiation, phosphorescent substance presents strong greenish orange look long-persistence luminous.
Embodiment 2
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, Praseodymium trioxide (Pr 6O 11) 0.825g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum comprises one from 300 to 450nm broadband be positioned at 611nm trivalent Pr 3+Emission peak form.Through the 254nm UV-irradiation, phosphorescent substance presents strong pink long-persistence luminous.
Embodiment 3
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, Samarium trioxide (Sm 2O 3) 1.744g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 950 ℃, constant temperature 6 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum comprises one from 300 to 450nm broadband with lay respectively at 570 and two characteristic emission peaks of 602nm trivalent Sm ionic.Through the 254nm UV-irradiation, phosphorescent substance presents strong pink long-persistence luminous.
Embodiment 4
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, europium sesquioxide (Eu 2O 3) 1.760g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1100 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum comprises one from 300 to 450nm broadband with lay respectively at 591 and the trivalent europium characteristic emission peak of 612nm.Through the 254nm UV-irradiation, it is luminous that phosphorescent substance presents red long-afterglow.
Embodiment 5
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, gadolinium sesquioxide (Gd 2O 3) 0.906g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3).Through 254nm UV-irradiation 1 minute, it is long-persistence luminous that phosphorescent substance presents bluish voilet.
Embodiment 6
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, terbium sesquioxide (Tb 4O 7) 0.915g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1100 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3).Through the 254nm UV-irradiation, it is luminous that phosphorescence presents strong green long afterglow.
Embodiment 7
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, trioxide (Tm 2O 3) 0.965g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1100 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3).Through the 254nm UV-irradiation, it is luminous that phosphorescence presents strong blue-green long persistence.
Embodiment 8
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, ytterbium oxide (Yb 2O 3) 1.576g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1100 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3).Emmission spectrum comprises one from 300 to 450nm broadband with lay respectively at 550 trivalent ytterbium emission band.Through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescence presents strong bluish voilet.
Embodiment 9
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, yttrium oxide (Y 2O 3) 0.56g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 600nm broadband, the strongest emission is positioned at 400nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet.
Embodiment 10
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, lanthanum trioxide (La 2O 3) 0.82g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1000 ℃, constant temperature 6 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 600nm broadband, the strongest emission is positioned at 400nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet.
Embodiment 11
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, Neodymium trioxide (Nd 2O 3) 0.84g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1000 ℃, constant temperature 6 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 600nm broadband, the strongest emission is positioned at 435nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet.
Embodiment 12
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, Holmium trioxide (Ho 2O 3) 0.94g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 6 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 650nm broadband, the strongest emission is positioned at 410nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet.
Embodiment 13
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, Erbium trioxide (Er 2O 3) 0.96g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 6 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 650nm broadband, the strongest emission is positioned at 390nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet.
Embodiment 14
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, lutecium oxide (Lu 2O 3) 0.96g, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 4 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 650nm broadband, the strongest emission is positioned at 405nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet.
Embodiment 15
Take by weighing analytical pure cadmium carbonate (CdSiO 3) 17.21g, spectroscopically pure silicon-dioxide (SiO 2) 6.0g, yttrium oxide (Y 2O 3) and Holmium trioxide (Ho 2O 3) 0.75g altogether, in agate mortar, fully grind mix after, in the corundum crucible, compacting covers mouth of pot completely with dull and stereotyped crucible cover, places in the High Temperature Furnaces Heating Apparatus, is heated to 1050 ℃, constant temperature 3 hours.High temperature is come out of the stove, and is cooled to room temperature.Product is a white powder.Identify that through XRD product is metasilicic acid cadmium (CdSiO 3), emmission spectrum be one from 300nm to the 600nm broadband, the strongest emission is positioned at 400nm, through the 254nm UV-irradiation, it is long-persistence luminous that phosphorescent substance presents strong bluish voilet, its intensity is 120% of embodiment 9.
Although described the present invention in detail with reference to above-mentioned embodiment, those skilled in the art or researchist can carry out various conversion and can not depart from the scope of the present invention.

Claims (9)

1, a kind of single-base multi-photochromic long afterglow phosphorescence body, it consists of: CdSiO 3: Re 3+, metasilicic acid cadmium CdSiO wherein 3Be matrix, active ions Re 3+Be trivalent rare earth ions.
2, phosphorescent substance according to claim 1 is characterized in that: described Re is selected from Ce, Pr, Sm, Eu, Gd, Tb, Tm, any one among the Yb or multiple element.
3, phosphorescent substance according to claim 1 is characterized in that: described Re is selected from Y, La, Nd, Ho, Er, one or more elements among the Lu.
4, a kind of preparation method of phosphorescent substance according to claim 1 is characterized in that: with cadmium carbonate CdCO 3With silicon-dioxide SiO 2Make base starting material, doping activator Re 3+, thorough mixing is placed in the corundum crucible, adds a cover calcination; Cooling can obtain the white powder product.
5, preparation method according to claim 4 is characterized in that: described cadmium carbonate CdCO 3Be analytical pure or high-purity cadmium carbonate, described silicon-dioxide SiO 2Be spectroscopically pure or high-purity silicon dioxide, take by weighing by 1: 1 mole of proportioning.
6, preparation method according to claim 4 is characterized in that: described activator is with Re 2O 3Form adds.
7, preparation method according to claim 6 is characterized in that: the doping content of described activator is 0.1-20%.
8, according to claim 4,5,6 or 7 described preparation methods, it is characterized in that: calcination under 950-1150 ℃ of temperature, reaction times 3-6 hour.
9, preparation method according to claim 8, it is characterized in that: high temperature is come out of the stove after the calcination, cools off in air.
CN 03120806 2003-01-27 2003-03-20 Single-base multi-photochromic long afterglow phosphorescence body and its preparation method Expired - Fee Related CN1210372C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 03120806 CN1210372C (en) 2003-01-27 2003-03-20 Single-base multi-photochromic long afterglow phosphorescence body and its preparation method

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CN03113678.8 2003-01-27
CN03113678 2003-01-27
CN03113680.X 2003-01-27
CN03113680 2003-01-27
CN 03120806 CN1210372C (en) 2003-01-27 2003-03-20 Single-base multi-photochromic long afterglow phosphorescence body and its preparation method

Publications (2)

Publication Number Publication Date
CN1478854A CN1478854A (en) 2004-03-03
CN1210372C true CN1210372C (en) 2005-07-13

Family

ID=34198447

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 03120806 Expired - Fee Related CN1210372C (en) 2003-01-27 2003-03-20 Single-base multi-photochromic long afterglow phosphorescence body and its preparation method

Country Status (1)

Country Link
CN (1) CN1210372C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022072124A1 (en) * 2020-09-30 2022-04-07 University Of Massachusetts Nanoparticles with tunable afterglow and compositions and methods thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022072124A1 (en) * 2020-09-30 2022-04-07 University Of Massachusetts Nanoparticles with tunable afterglow and compositions and methods thereof

Also Published As

Publication number Publication date
CN1478854A (en) 2004-03-03

Similar Documents

Publication Publication Date Title
TW200404883A (en) Phosphors containing oxides of alkaline-earth and group-IIIB metals and light sources incorporating the same
CN102051176A (en) Fluorescent material, manufacture method thereof and light-emitting device comprising fluorescent material
CN107189776B (en) Green silicate long-afterglow luminescent material and preparation method thereof
Kuo et al. Synthesis and luminescence properties of Eu3+, Ce3+ and Tb3+-activated Sr3La2 (BO3) 4 under UV excitation
CN110257057A (en) A kind of yellow longpersistent luminescent material and preparation method thereof
CN101402857B (en) Red luminous material for LED and producing process thereof
WO2013074158A1 (en) Green and yellow aluminate phosphors
CN107129805B (en) Europium ion doped silicate white light fluorescent powder and preparation method thereof
CN108949173B (en) Cyan silicate ultra-long afterglow luminescent material and preparation method thereof
EP2565253B1 (en) Silicate luminescent material and production method thereof
CN101760191B (en) High-brightness barium-silicate-based blue-green fluorescent powder for LED and high-temperature reducing preparation method thereof
CN108276998B (en) Trivalent samarium ion doped barium gadolinium titanate red fluorescent powder and preparation method thereof
CN103131415B (en) Yellow long-lasting phosphor material and preparation method thereof
CN1210372C (en) Single-base multi-photochromic long afterglow phosphorescence body and its preparation method
CN101705094B (en) Near ultraviolet excited blue-green fluorescent powder for semiconductor illumination and preparation method thereof
CN109294583B (en) Cerium ion doped barium gadolinium titanate blue fluorescent powder for white light LED and preparation method thereof
CN114836211A (en) Cu ion doped gallium germanate based green long afterglow material and preparation method thereof
CN104194781B (en) Long persistence luminescent material with single substrate and adjustable persistence colors and preparation method of long persistence luminescent material
CN105524615A (en) Niobate red phosphor for white-light LEDs and preparation method thereof
CN115261017B (en) Blue light luminescent material capable of being excited by purple light and preparation method thereof
CN1221630C (en) Long persistence phosphor of monobasis giving out white light and its preparing method
CN108441213A (en) A kind of red fluorescence powder and preparation method thereof
CN102899042A (en) Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder and preparation method thereof
CN116004227B (en) Ultraviolet excited blue light emitting fluorescent powder and preparation method and application thereof
CN112300799B (en) Nitrogen oxide fluorescent powder and light-emitting device containing same

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20050713