CN111100634A - Long-afterglow fluorescent material and preparation method thereof - Google Patents
Long-afterglow fluorescent material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title description 7
- 239000002994 raw material Substances 0.000 claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 16
- 238000001354 calcination Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 4
- RSEIMSPAXMNYFJ-UHFFFAOYSA-N europium(III) oxide Inorganic materials O=[Eu]O[Eu]=O RSEIMSPAXMNYFJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000012856 weighed raw material Substances 0.000 claims description 4
- 230000005923 long-lasting effect Effects 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 30
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000391 magnesium silicate Substances 0.000 abstract description 8
- 229910052919 magnesium silicate Inorganic materials 0.000 abstract description 8
- 235000019792 magnesium silicate Nutrition 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000004020 luminiscence type Methods 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 238000009877 rendering Methods 0.000 abstract description 3
- 238000010532 solid phase synthesis reaction Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052693 Europium Inorganic materials 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 230000005284 excitation Effects 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 238000005424 photoluminescence Methods 0.000 description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 5
- -1 alkaline earth metal sulfide Chemical class 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000000695 excitation spectrum Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 238000012984 biological imaging Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 150000002602 lanthanoids Chemical class 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000002688 persistence Effects 0.000 description 2
- 230000001443 photoexcitation Effects 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000005084 Strontium aluminate Substances 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- FNWBQFMGIFLWII-UHFFFAOYSA-N strontium aluminate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Al+3].[Sr+2].[Sr+2] FNWBQFMGIFLWII-UHFFFAOYSA-N 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- 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
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
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- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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- H01L33/502—Wavelength conversion materials
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Abstract
The invention discloses a long afterglow phosphor material with a chemical formula of Ba1‑xMgSiO4:xEu2+It is prepared with BaCO3、MgO、SiO2And Eu2O3Is prepared by calcining the main raw materials in a reducing atmosphere. The invention adopts a high-temperature solid phase method to utilize Eu under a reducing atmosphere2+Doping of high chemical stability magnesium silicate BaMgSiO4The obtained fluorescent powder has long afterglow luminescence (about 1 hour) performance, can provide a solution for solving the stroboscopic problem of an alternating current LED device, has good chemical stability, strong water resistance, high afterglow brightness, high light conversion efficiency, good color rendering index and the like, and is suitable for white light LEDs and other related fields; and the related synthesis process is simple, has good repeatability and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of luminescent materials, and particularly relates to a long afterglow fluorescent material and a preparation method thereof.
Background
Long persistence luminescent materials are a class of materials that store excitation energy and slowly release the energy as light after excitation ceases. Long persistence luminescence is one type of photoluminescence based on lanthanides (Ln)3+) The doped long-afterglow inorganic fluorescent powder has potential application in the fields of illumination display, solar cells, biological imaging, temperature measurement and the like, and is concerned.
The long afterglow luminescent material commonly used in the market at present mainly comprises three systems of sulfide, aluminate, silicate and the like. The long afterglow phosphor of metal sulfide is called the first generation of long afterglow luminescent material, has been developed for over 150 years, and mainly comprises alkaline earth metal sulfide such as CaS: Bi, ZnS: Cu, CaS: Eu, Tm, etc. The long afterglow material with sulfide as matrix can emit light in the whole visible light range from blue light to red light, but has limited practical application owing to its low light emitting brightness, poor chemical stability and other demerits. The long afterglow phosphor powder with aluminate as matrix is named as the second generation long afterglow luminescent material, and has luminous intensity, afterglow time and chemical stability superior to those of the first generation sulfide long afterglow luminescent material, with strontium metaaluminate and strontium aluminate doped with Eu and Dy as representatives. The silicate long-afterglow fluorescent powder developed after 90 years is called as the third generation long-afterglow luminescent material, has better chemical stability and thermal stability, and the high-purity silicon raw material is easy to obtain and cheap, so that the development of the rare earth long-afterglow fluorescent powder enters a new stage, and the silicate long-afterglow fluorescent powder is widely used in the fields of illumination, display, biological imaging and the like at present.
In recent years, white light LED has been a new type of all-solid-state lighting source, and its research and development have made great progress. No matter how the packaging form is changed, the key technology for realizing warm white light at present is to combine the chip and the fluorescent powder. Therefore, as a key component, the performance of the long afterglow phosphor directly affects the luminous efficiency, color rendering property, and the like of the white LED. The existing fluorescent powder for the lamp mainly has the defects of harsh synthesis process conditions, low conversion efficiency, short afterglow time, unsatisfactory color development, color coordinate movement, poor stability and the like, so that the work of developing the novel fluorescent powder for the lamp is particularly important.
Disclosure of Invention
The invention mainly aims to provide a long-afterglow magnesium silicate fluorescent material aiming at the defects in the prior art, and a high-temperature solid-phase method is adopted to utilize Eu under a reducing atmosphere2+Doping of high chemical stability magnesium silicate BaMgSiO4The fluorescent powder obtained By (BMSO) has long afterglow luminescence (about 1 hour) performance, provides a solution for solving the stroboscopic problem of an alternating current LED device, has good chemical stability, strong water resistance, high afterglow brightness, high light conversion efficiency, good color rendering index and the like, is suitable for white light LEDs and other related fields, and is simple in related synthesis process, good in repeatability and suitable for popularization and application.
In order to achieve the purpose, the invention adopts the technical scheme that:
eu (Eu)2+The doped magnesium silicate long afterglow fluorescent material has the chemical formula of Ba1-xMgSiO4:xEu2+Wherein x is 0.01 to 0.03, and the crystal structure thereof belongs to the hexagonal system and is formed by Eu2+Doped substituted Ba2+And (4) forming a locus.
Preferably, the value of x is 0.015, and Ba is obtained0.985MgSiO4:0.015Eu2+The best optical performance.
Eu as described above2+The preparation method of the doped silicate fluorescent material comprises the following steps:
1) with BaCO3、MgO、SiO2And Eu2O3As a raw material, according to a target chemical formula Ba1-xMgSiO4:xEu2+Accurately weighing each raw material according to the stoichiometric ratio; mixing, grinding and drying the weighed raw materials to obtain a mixed raw material;
2) and calcining the obtained mixed raw materials in a reducing atmosphere, cooling to room temperature, and grinding to obtain the target fluorescent powder material.
Preferably, the Eu in step 1)2+The doping concentration (i.e., the value of x) of (a) is 0.015.
Preferably, the drying temperature is 650-750 ℃.
Preferably, the reducing atmosphere is formed by mixing hydrogen and nitrogen, wherein the volume content of the hydrogen is 5-10%.
Preferably, the calcination temperature is 1300-1400 ℃, and the time is 15-25 h.
Preferably, the grinding step adds absolute ethyl alcohol to the raw material.
The magnesium silicate long afterglow fluorescent material can be applied to the fields of white light LEDs and the like.
The principle of the invention is as follows:
the invention synthesizes Ba in the reducing atmosphere and 1300-1400 DEG C1-xMgSiO4:xEu2+Oxygen vacancies in oxide phosphors due to oxygen deficiency
The oxygen vacancy concentration can be improved, and the trap energy level depth can be adjusted; under excitation conditions (photoexcitation, thermal excitation, etc., especially under ultraviolet excitation conditions), Eu2+Liberated electrons (Eu)2+Photoionization to Eu3+Or Eu2 +-h·) Is easily trapped by nearby oxygen vacancies to form
Or
After the excitation is removed, the trapped electrons can be slowly released to the photo-generated Eu3+(Eu2+-h·) Nearby and cause green long afterglow luminescence.
Compared with the prior art, the invention has the beneficial effects that:
1) the high-temperature solid-phase reaction method adopted by the invention is simple and feasible, the reaction is rapid, the selected magnesium silicate matrix material has good thermal stability and chemical stability, the prepared fluorescent powder sample has high purity, and mass production can be realized;
2) eu prepared by the invention2+Single doped magnesium silicate BaMgSiO4The fluorescent powder material has two PL peaks at 399 and 503nm, and the bright green long-afterglow luminescent fluorescent powder can be used asGreen components have potential application value in solid-state lighting devices;
3) the Eu single-doped magnesium silicate BaMgSiO prepared by the invention4The fluorescent powder material can be effectively excited by ultraviolet light, and simultaneously emits light with 399 nm, 503nm and 612 nm; full-color spectral emission is realized in a single-doped rare earth ion mode, and an InGaN chip is well matched;
4) after excitation is stopped, the afterglow time of the green long-afterglow fluorescent powder prepared by the invention can reach 1 hour, the luminous attenuation caused by periodic change of alternating current can be compensated, and an effective solution is provided for the stroboscopic problem of an LED device.
Drawings
FIG. 1 is an XRD pattern of phosphor powders prepared in example 1, comparative example 1 and comparative example 2 of the present invention;
FIG. 2 shows BMSO 1.5% Eu as the phosphor powder prepared in example 12+Photoluminescence excitation spectrum and photoluminescence emission (gaussian decomposition) spectrum of (a);
FIG. 3 shows photoluminescence excitation spectrum and photoluminescence emission spectrum of 1.5% Eu as BMSO of phosphor powder prepared in comparative example 1;
FIG. 4 shows BMSO 1.5% Eu as phosphor powders prepared in example 1 and comparative example 12+And a phosphorescence decay curve of BMSO: 1.5% Eu.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
Eu (Eu)2+Doped silicate phosphor material (Ba)0.985MgSiO4:0.015Eu2+) The preparation method comprises the following steps:
1) according to the target chemical formula Ba0.985MgSiO4:0.015Eu2+The required raw material 3.2702g (1.6699X 10) is accurately weighed according to the stoichiometric ratio-2mol)BaCO3、0.6741g(1.6853×10-2mol)MgO、1.0112g(1.6853×10- 2mol)SiO2、0.0445g(1.264×10-4mol)Eu2O3(the purity of the used raw materials is analytically pure, and the granularity is micron grade);
2) placing the weighed raw materials into a silicon nitride mortar, adding 1ml of absolute ethyl alcohol, ball-milling for 4.0h by using a planetary ball mill, uniformly mixing, placing the obtained powder into a muffle furnace (700 ℃) for preheating and drying to obtain a mixed raw material;
3) the resulting mixed raw material was placed in a crucible, and then placed in a tube furnace in a reducing atmosphere (95 vol% N)2+5％volH2) And (3) calcining (the calcining temperature is 1350 ℃ and the calcining time is 20 hours), cooling to room temperature after calcining is finished, and grinding to obtain the target fluorescent powder material.
Comparative example 1
Eu-doped fluorescent powder Ba0.985MgSiO40.015Eu, which is prepared substantially in the same manner as in example 1 except that the reducing atmosphere in step 3) is replaced with an air atmosphere.
Comparative example 2
Silicate matrix material BaMgSiO4The preparation method comprises the following steps:
1) according to the target chemical formula BaMgSiO4The required raw material 3.3165g (1.6835X 10) is accurately weighed according to the stoichiometric ratio-2mol)BaCO3、0.6734g(1.6835×10-2mol)MgO、1.0101g(1.6835×10-2mol)SiO2(the purity of the used raw materials is analytically pure, and the granularity is micron grade);
2) placing the weighed raw materials into a silicon nitride mortar, adding absolute ethyl alcohol, ball-milling for 4.0h by using a planetary ball mill, uniformly mixing, placing the obtained powder into a muffle furnace (700 ℃) for preheating and drying to obtain a mixed raw material;
3) the resulting mixed raw material was placed in a crucible, and then placed in a tube furnace in a reducing atmosphere (95 vol% N)2+5vol％H2) Calcining at 1350 deg.C for 20 hr, cooling to room temperature, and grinding to obtain the target matrix material.
Testing and results analysis
FIG. 1 shows the use of phosphor powders prepared in example 1, comparative example 1 and comparative example 2XRD patterns measured by an X-ray diffractometer (model D8Advance, Germany) showed that the samples prepared in the above examples and comparative examples all had the same shape as BaMgSiO4And the corresponding crystal structure is doped with a small amount of rare earth ions, so that the crystal structure of the fluorescent powder cannot be changed.
FIG. 2 shows BMSO 1.5% Eu prepared in example 12+The phosphor powder was measured for photoexcitation spectrum and photoemission spectrum using a fluorescence spectrophotometer (model Hitachi F-4600, Japan) and the measurement results showed that there was a broad PLE band between 250 and 380nm attributable to Eu2+4f of65d1→4f7(8S7/2) Electron transition shows that the fluorescent powder can be effectively excited by ultraviolet light. Meanwhile, it can be seen from the PL curve of Gaussian decomposition that BMSO is 1.5% Eu2+The emission of the phosphor covers the blue and green range with emission peaks at 399 and 503nm, providing highly colored blue and green components for the LED device.
FIG. 3 shows photoluminescence excitation spectrum and photoluminescence emission spectrum of BMSO 1.5% Eu phosphor powder prepared in comparative example 1, measured using a fluorescence spectrophotometer (model Hitachi F-4600, Japan), showing that PLE spectrum contains strong broadband absorption in the UV range and a set of sharp line peaks in the longer wavelength range. At the same time, Eu was detected2+Green light emission and Eu3+The LED linear LED emits red light linearly, has striking light emitting color, and can well match with the InGaN ultraviolet light excitation light source chip which is commercially used at present.
FIG. 4 shows BMSO 1.5% Eu as phosphor powders prepared in example 1 and comparative example 12+And BMSO 1.5% Eu phosphorescence decay curves measured with a fluorescence spectrophotometer (Horiba, Jobin Yvon TBXPS) using tunable pulsed laser radiation as an excitation source. Detecting BMSO Eu in sample2+Sustained phosphorescence of (1h, recognizable intensity level of 0.32 mcd. m-2) Is 12 times longer than BMSO Eu (5 min); longer phosphorescence and BMSO Eu2+More oxygen vacancy defects in the film. Comparison of BMSO to Eu and BMSO to Eu2+The formation of oxygen vacancies in the BMSO: Eu will be more difficult due to the presence of oxygen during the synthesis.And for BMSO Eu2+More oxygen vacancies will be formed due to the lack of oxygen under the reductive preparation conditions, and BMSO Eu2+Is deeper than BMSO Eu.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.
Claims (6)
1. A long afterglow fluorescent material is characterized in that the chemical formula is Ba1-xMgSiO4:xEu2+Wherein x is 0.01 to 0.03, and the crystal structure thereof belongs to the hexagonal system and is formed by Eu2+Doped substituted Ba2+And (4) forming a locus.
2. The long-lasting phosphor according to claim 1, characterized in that it has the chemical formula Ba0.985MgSiO4:0.015Eu2+。
3. The method for preparing a long-lasting phosphor material according to claim 1 or 2, comprising the steps of:
1) with BaCO3、MgO、SiO2And Eu2O3As a raw material, according to a target chemical formula Ba1-xMgSiO4:xEu2+And x is 0.01-0.03, and all the raw materials are weighed according to the stoichiometric ratio; mixing, grinding and drying the weighed raw materials to obtain a mixed raw material;
2) and calcining the obtained mixed raw materials in a reducing atmosphere to obtain the long-afterglow fluorescent material.
4. The method as claimed in claim 3, wherein the drying temperature is 650-750 ℃.
5. The method according to claim 3, wherein the reducing atmosphere is a mixture of hydrogen and nitrogen, and the hydrogen is present in an amount of 5 to 10% by volume.
6. The method as claimed in claim 3, wherein the calcination temperature is 1300-1400 ℃ and the calcination time is 15-25 h.
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| CN114032101A (en) * | 2021-11-25 | 2022-02-11 | 广东电网有限责任公司 | Long-afterglow luminescent material, preparation method and application thereof |
| CN116904186A (en) * | 2023-07-17 | 2023-10-20 | 松山湖材料实验室 | Green fluorescent material, preparation method thereof and light-emitting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114032101A (en) * | 2021-11-25 | 2022-02-11 | 广东电网有限责任公司 | Long-afterglow luminescent material, preparation method and application thereof |
| CN116904186A (en) * | 2023-07-17 | 2023-10-20 | 松山湖材料实验室 | Green fluorescent material, preparation method thereof and light-emitting device |
| CN116904186B (en) * | 2023-07-17 | 2024-08-09 | 松山湖材料实验室 | Green fluorescent material, preparation method thereof and light-emitting device |
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Application publication date: 20200505 |