CN114540935B - Rare earth praseodymium borate crystal material and preparation method thereof - Google Patents
Rare earth praseodymium borate crystal material and preparation method thereof Download PDFInfo
- Publication number
- CN114540935B CN114540935B CN202210350407.1A CN202210350407A CN114540935B CN 114540935 B CN114540935 B CN 114540935B CN 202210350407 A CN202210350407 A CN 202210350407A CN 114540935 B CN114540935 B CN 114540935B
- Authority
- CN
- China
- Prior art keywords
- rare earth
- praseodymium
- borate
- crystal
- crystal material
- 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.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B9/00—Single-crystal growth from melt solutions using molten solvents
Abstract
The invention discloses a rare earth praseodymium borate crystal material and a preparation method thereof, wherein the rare earth metal borate crystal material is Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 O crystals of P2 1 The/c space group. The preparation method comprises the following steps: adding boric acid, praseodymium nitrate hexahydrate, alumina and deionized water into a polytetrafluoroethylene lining, uniformly mixing, reacting for one day at 260 ℃ under the condition of autogenous pressure, then cooling to 240 ℃ and continuing to react for 4 days to obtain rare earth praseodymium borate Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 And O crystal material. The compound is synthesized by medium-temperature hydrothermal, the synthesis steps are simple, the obtained crystal has high quality, is not deliquescent in air and insoluble in water, a specific structure can be obtained by single crystal diffraction test, the energy consumption in the synthesis process is low, and the adopted raw materials are easy to obtain and have low price. The obtained rare earth borate compound has the characteristic luminescence property of Pr.
Description
Technical Field
The invention belongs to the technical field of crystal materials, and particularly relates to a rare earth praseodymium borate crystal material and a preparation method thereof.
Background
Rare earth borate has received extensive attention and research in recent years, and the binary system can combine the characteristics of rare earth and borate to obtain a material with excellent performance, and can be applied to the fields of multiband photoluminescence, laser, nonlinear optics, biosensors, medical diagnosis and the like. Boron coordinates with oxygen in the borate structure to form two basic configurations, BO respectively 3 Triangular configuration and BO 4 The two basic configurations can form a variety of boron oxygen anion clusters through the shared oxygen atom, so that the borate has very various structures, the configurations which can be selected are rich, the boric acid has low melting point, the synthesis method is simple and effective, the cost is relatively low, and the borate can be combined with various types of cations, such as organic cations, alkali or alkaline earth metal ions and the like, so that various functional materials can be formed. The rare earth has special 4f orbital electrons and is coated with 5s 2 5p 6 The orbit electron shields, the luminous purity is higher, can regard as the luminescence center. When the rare earth compound is used as a luminescent material, the luminous intensity, the luminous wavelength and the like of the rare earth compound are influenced by a substrate combined with the rare earth compound, and the selection of a proper substrate can enhance the luminous intensity and adjust the luminous wavelength. The luminescent property can be obtained by combining rare earth cations with boric acid anion clusters with rich structural varietiesCan be made into good material.
The reason why the high-temperature solid-phase synthesis method is a main method for obtaining rare earth borate, and the hydrothermal synthesis method with relatively low temperature is difficult to obtain rare earth borate crystals is that according to the Lux-Flood acid-base theory, the rare earth ions have high charges, and the charges are concentrated when the rare earth ions are combined with polyborate ion clusters, so that a stable structure is not easily formed, and crystallization is difficult (chem. Mater.2003,15, 2253-2260). In addition, because the reaction environment of the borate crystal obtained under the hydrothermal condition is between alkaline and weakly acidic, rare earth ions are easy to hydrolyze under the condition to become precipitates, and the rare earth borate crystal is difficult to form.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the rare earth praseodymium borate crystal material and the preparation method thereof, the rare earth borate crystal is obtained by a hydrothermal synthesis method at a lower temperature, the energy consumption in the synthesis process is lower, and the adopted raw materials are easy to obtain and have low price. The obtained rare earth borate compound has the characteristic luminescence property of Pr.
In order to solve the technical problem, the invention adopts the following technical scheme:
a RE praseodymium borate crystal material is prepared from Pr B 5 O 8 (OH)]NO 3 ·2H 2 O crystal, pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 The O crystal belongs to P2 1 The/c space group.
Further, the Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 The O crystal contains one Pr ion of rare earth with 3 valence, 5B ions with 3 valence which are independent crystallographically, 9O ions connected with B, 1 nitrate ion, two crystal water molecules, 5B ions and 9O ions are connected to form [ B 5 O 8 (OH)]Polyanion cluster, which can be seen as 3 BOs 3 Triangle and two BOs 4 The tetrahedrons share vertex oxygen, the anion cluster can be used as a basic construction unit, each unit is connected with other 4 units to form a two-dimensional layered B-O structure on an ac plane, and rare earth Pr is filled in a window of the two-dimensional layered B-O structure.
The preparation method of the rare earth praseodymium borate crystal material comprises the following steps: uniformly mixing 15mmol of boric acid, 1mmol of praseodymium nitrate hexahydrate, 1mmol of alumina and 3mL of deionized water in a polytetrafluoroethylene lining with the volume of 23mL, reacting for one day at the temperature of 260 ℃, then cooling to 240 ℃ and continuing to react for 4 days to obtain light green regular flaky crystal rare earth praseodymium borate Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 And O crystal material.
Preferably, the molar ratio of the boric acid to the praseodymium nitrate hexahydrate to the alumina is 15.
Preferably, 2 to 4mL of deionized water is needed based on 1mmol of praseodymium nitrate hexahydrate.
Further, 3mL of deionized water was required based on 1mmol of praseodymium nitrate hexahydrate.
The rare earth neodymium borate near-infrared luminescent crystal material of the invention is prepared by the following steps: uniformly mixing 15mmol of boric acid, 1mmol of praseodymium nitrate hexahydrate, 1mmol of alumina and 3mL of deionized water in a polytetrafluoroethylene lining with the volume of 23mL, reacting for one day at 260 ℃ under the condition of autogenous pressure (pressure generated by internal air and water vapor), then cooling to 240 ℃ and continuing to react for 4 days to obtain light green regular flaky crystal rare earth praseodymium borate Pr [ B ] of the green regular flaky crystal 5 O 8 (OH)]NO 3 ·2H 2 O crystal material.
The invention has the beneficial effects that: many rare earth borate compounds are reported, but most of the rare earth borate compounds are in powder morphology, and the products in the reported crystal morphology have completely different crystallographic parameters and completely different physicochemical properties due to different connection modes. In the hydrothermal reaction process, boric acid and praseodymium nitrate hexahydrate are both melted to form a molten state at 260 ℃, the form of boric acid ion clusters is changed after the molten boric acid is combined with alumina, the boric acid is combined with molten rare earth, 3ml of added water is added, the water enables reaction raw materials to finally form a uniform mixture in a reaction kettle, the reaction is carried out at a set temperature and under autogenous pressure, and after the reaction is finished and cooled to room temperature, pr [ B ] is obtained by natural crystallization 5 O 8 (OH)]NO 3 ·2H 2 And O crystal material.
The compound is synthesized by medium-temperature hydrothermal, the synthesis steps are simple, the obtained crystal has high quality, is not deliquescent in air and insoluble in water, the specific structure can be obtained by single crystal diffraction test, the energy consumption in the synthesis process is low, and the adopted raw materials are easy to obtain and have low price. The obtained rare earth borate compound has the characteristic luminescence property of Pr.
Drawings
FIG. 1 shows a compound Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 An asymmetric unit of O;
FIG. 2 shows a compound Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 A two-dimensional B-O layer structure of O;
FIG. 3 shows the compound Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 Cell stacking diagram of O;
FIG. 4 shows the compound Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 O powder diffractogram (experimental values for the upper curve and simulated values for the lower curve);
FIG. 5 shows the compound Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 O fluorescence spectrum (excitation wavelength 400 nm).
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given the full breadth of the appended claims and any and all insubstantial modifications and variations thereof which can be made by one skilled in the art based on the teachings of the invention as described above.
Example 1
The preparation method of the rare earth praseodymium borate crystal material comprises the following steps: uniformly mixing 15mmol of boric acid, 1mmol of praseodymium nitrate hexahydrate, 1mmol of alumina and 3mL of deionized water in a polytetrafluoroethylene lining with the volume of 23mL, reacting for one day at 260 ℃, then cooling to 240 ℃ and continuing to react for 4 days to obtain light green regular flaky crystal rare earth praseodymium borate Pr [ B ] as a material 5 O 8 (OH)]NO 3 ·2H 2 And O crystal material.
In the hydrothermal reaction process, boric acid and praseodymium nitrate hexahydrate are melted at 260 ℃ to form a molten state, the state of boric acid ion clusters is changed after the molten boric acid is combined with alumina, so that the boric acid is combined with molten rare earth, 3ml of added water is added, the water enables reaction raw materials to finally form a uniform mixture in a reaction kettle, the reaction is carried out at a set temperature and a self-generated pressure, and after the reaction is finished and cooled to room temperature, the product is naturally crystallized to form the product. Under the condition of other conditions, when the water adding amount is changed, the rare earth praseodymium borate crystal material can be obtained between 2 and 4mL of water.
The present invention adopts medium temperature hydrothermal process and specific reaction condition to synthesize new rare earth metal borate Pr B 5 O 8 (OH)]NO 3 ·2H 2 O crystal, the main crystallographic parameters of which are shown in Table 1. Compound Pr [ B 5 O 8 (OH)]NO 3 ·2H 2 The O crystal belongs to P2 1 The/c space group has an asymmetric unit structure shown in figure 1, and comprises one 3-valent rare earth Pr ion, 5 crystallographically independent 3-valent B ions, 9O ions connected with B, 1 nitrate ion and two crystal water molecules. 5B ions are linked with 9O ions to form a [ B ] 5 O 8 (OH)]Polyanion cluster, which can be seen as 3 BOs 3 Triangle and two BOs 4 The tetrahedra share a vertex oxygen. The anion cluster can be used as a basic construction unit, each unit is connected with 4 other units to form a two-dimensional layered B-O structure on an ac plane, and rare earth Pr is filled in a window of the two-dimensional layered B-O structure (figure 2). As shown in the cell stacking diagram (FIG. 3), the space between the layered B-O structures is filled with nitrate ions and crystal water.
The bond length of B-O bond in the compound is divided into two types, one is BO 3 Triangular structure, B-O bond length in the range of
BO of another B type with four oxygens 4 In the tetrahedral structure, the bond length of the B-O bond is in the range of
In between. The N-O bond length of the nitrate ions is in the range of
Pr is coordinated with 10 oxygen atoms, and the bond length of the Pr-O bond is in the range of
In between. These bond length values are consistent with reported crystal data for rare earth borates.
Compound Pr [ B 5 O 8 (OH)]NO 3 ·2H 2 The crystal of O is tested by powder XRD, as shown in figure 4, in the range of 9-50 degrees, the peak positions of the powder experiment diffraction peak and the theoretical diffraction peak can be in one-to-one correspondence, and the obtained compound is proved to be pure phase. The visible light emission performance of the compound is shown in figure 5, under the condition that the excitation wavelength is 400nm, the characteristic emission peaks of Pr appear in the range of 450-850nm, and the five characteristic emission peaks are 461nm,476nm,493nm and 611nm and 694nm respectively and correspond to the rare earth Pr ions 3 H 4 → 3 P 2 、 3 H 4 → 3 P 1 、 3 H 4 → 3 P 0 And 1 D 2 → 3 H 4 、 3 P 0 → 3 F 3 the characteristic emission peak generated by the transition indicates that the compound can be used as a potential photoluminescence material.
TABLE 1 Compound Pr [ B 5 O 8 (OH)]NO 3 ·2H 2 O crystallography data sheet
The invention obtains rare earth borate crystal by a hydrothermal synthesis method at lower temperature, selects and uses aluminum oxide or zinc oxide, the aluminum, the zinc and oxygen are combined to form Al-O tetrahedron and Zn-O tetrahedron structures, the structures are easy to be combined with a boron-oxygen cluster framework, and aims to add aluminum-zinc oxide serving as a reaction raw material into boric acid and rare earth, change the inherent reaction environment of the rare earth and the boric acid, thereby obtaining the rare earth borate crystal in the hydrothermal synthesis.
According to the invention, alumina, zinc oxide, boric acid and praseodymium nitrate are selected as reaction raw materials, a proper amount of deionized water is added as a medium to carry out hydrothermal reaction, a reaction vessel is a reaction kettle with a 23mL polytetrafluoroethylene lining embedded, and a series of comparative experiments are carried out, wherein the specific experiments are shown in Table 2.
TABLE 2 series of comparative tests
As can be seen from Table 2, experiment No. 6 successfully obtained the Pr [ B ] compound of the present invention 5 O 8 (OH)]NO 3 ·2H 2 The crystal of O is obtained by a one-step hydrothermal synthesis method, the crystal appearance is light green sheet, the crystal is small, the surface cracks are more, the crystal cell parameters are determined by single crystal experiment tests, but the analysis is difficult. Based on the condition of successfully obtaining the crystals, 15mmol of boric acid, 1mmol of praseodymium nitrate hexahydrate, 1mmol of alumina and 3mL of deionized water are uniformly mixed in a polytetrafluoroethylene lining with the volume of 23mL, the mixture is reacted for one day at the temperature of 260 ℃ and under the autogenous pressure (the pressure generated by internal air and water vapor), and then the temperature is reduced to 240 ℃ to continue the reaction for 4 days, so that light green regular flaky crystals with high quality are obtained. In the hydrothermal reaction process, boric acid and praseodymium nitrate hexahydrate are both melted at 260 ℃ to form a molten state, the state of boric acid ion clusters is changed after the molten boric acid is combined with alumina, so that the boric acid is combined with molten rare earth, 3ml of added water is added, the water enables reaction raw materials to finally form a uniform mixture in a reaction kettle, the reaction is carried out at a set temperature and under autogenous pressure, and after the reaction is finished and cooled to room temperature, the product is naturally crystallized to form the product of the embodiment. Otherwise, the water addition amount was changed and found to be 2The product crystals of the invention are obtained in 4mL of water.
Many rare earth borate compounds are reported, but most of the rare earth borate compounds are in powder morphology, and the products with the reported crystal morphology have completely different crystallographic parameters and completely different physicochemical properties due to different connection modes. The compound in the invention is synthesized by medium-temperature hydrothermal, the synthesis steps are simple, the obtained crystal has higher quality, is not deliquescent in air and insoluble in water, the specific structure can be obtained by single crystal diffraction test, the energy consumption in the synthesis process is lower, and the adopted raw materials are easy to obtain and have low price. The obtained rare earth borate compound has the characteristic luminescence property of Pr.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A rare earth praseodymium borate crystal material is characterized in that: the rare-earth metal borate crystal material is Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 O crystal, pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 The O crystal belongs to P2 1 The/c space group.
2. The rare earth praseodymium borate crystalline material of claim 1, wherein: the Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 The O crystal contains one 3-valent rare earth Pr ion, 5 crystallographically independent 3-valent B ions, 9O ions connected with B, 1 nitrate ion, two crystal water molecules, and 5B ions are connected with 9O ions to form one [ B ] ion 5 O 8 (OH)]Polyanion cluster, which can be seen as 3 BOs 3 TriangleTwo BOs 4 The tetrahedrons share vertex oxygen, the anion cluster can be used as a basic construction unit, each unit is connected with other 4 units to form a two-dimensional layered B-O structure on an ac plane, and rare earth Pr is filled in a window of the two-dimensional layered B-O structure.
3. The method for preparing a rare earth praseodymium borate crystal material as set forth in claim 1 or 2, characterized by comprising the steps of: adding boric acid, praseodymium nitrate hexahydrate, alumina and deionized water into a polytetrafluoroethylene lining, uniformly mixing, reacting for one day at 260 ℃, then cooling to 240 ℃ and continuing to react for 4 days to obtain light green regular flaky crystal rare earth praseodymium borate Pr [ B ] 5 O 8 (OH)]NO 3 ·2H 2 An O crystal material;
the molar ratio of the boric acid to the praseodymium nitrate hexahydrate to the alumina is 15;
2-4mL of deionized water is needed based on 1mmol of praseodymium nitrate hexahydrate.
4. The preparation method of the rare earth praseodymium borate crystal material according to claim 3, characterized in that: 3mL of deionized water is needed based on 1mmol of praseodymium nitrate hexahydrate.
5. The method for preparing rare earth praseodymium borate crystal material according to claim 3, characterized by the typical preparation steps as follows: uniformly mixing 15mmol of boric acid, 1mmol of praseodymium nitrate hexahydrate, 1mmol of alumina and 3mL of deionized water in a polytetrafluoroethylene lining with the volume of 23mL, reacting for one day at 260 ℃, then cooling to 240 ℃ and continuing to react for 4 days to obtain light green regular flaky crystal rare earth praseodymium borate Pr [ B ] as a material 5 O 8 (OH)]NO 3 ·2H 2 And O crystal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210350407.1A CN114540935B (en) | 2022-04-02 | 2022-04-02 | Rare earth praseodymium borate crystal material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210350407.1A CN114540935B (en) | 2022-04-02 | 2022-04-02 | Rare earth praseodymium borate crystal material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114540935A CN114540935A (en) | 2022-05-27 |
| CN114540935B true CN114540935B (en) | 2023-01-10 |
Family
ID=81665358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210350407.1A Active CN114540935B (en) | 2022-04-02 | 2022-04-02 | Rare earth praseodymium borate crystal material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114540935B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021133467A1 (en) | 2021-12-16 | 2023-06-22 | Endress+Hauser Conducta Gmbh+Co. Kg | Calibration standard, sensor arrangement and use |
| CN116163156A (en) * | 2023-01-05 | 2023-05-26 | 广东华凯科技股份有限公司 | Heat-conducting flame-retardant fiber material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007042653A1 (en) * | 2005-10-13 | 2007-04-19 | Rhodia Operations | Sub-micron rare earth borate, a method for the production thereof and the use in the form of luminophor |
| CN106480500A (en) * | 2016-10-08 | 2017-03-08 | 河南理工大学 | A kind of luminescence generated by light crystalline material boric acid praseodymium potassium and its preparation method and application |
-
2022
- 2022-04-02 CN CN202210350407.1A patent/CN114540935B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007042653A1 (en) * | 2005-10-13 | 2007-04-19 | Rhodia Operations | Sub-micron rare earth borate, a method for the production thereof and the use in the form of luminophor |
| CN106480500A (en) * | 2016-10-08 | 2017-03-08 | 河南理工大学 | A kind of luminescence generated by light crystalline material boric acid praseodymium potassium and its preparation method and application |
Non-Patent Citations (2)
| Title |
|---|
| La[B_5O_8(OH)(H_2O)]NO_3·2H_2O的合成与结构;李林艳等;《物理化学学报》;20050715(第07期);第769-773页 * |
| 新型水合稀土多硼酸盐Ln[B_5O_8(OH)_2](Ln=Pr,Nd)的合成与结构;李林艳等;《无机化学学报》;20050701(第07期);第949-954页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114540935A (en) | 2022-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114540935B (en) | Rare earth praseodymium borate crystal material and preparation method thereof | |
| Zhu et al. | Designed synthesis, morphology evolution and enhanced photoluminescence of a highly efficient red dodec-fluoride phosphor, Li 3 Na 3 Ga 2 F 12: Mn 4+, for warm WLEDs | |
| Min et al. | Novel pyrochlore-type La2Zr2O7: Eu3+ red phosphors: Synthesis, structural, luminescence properties and theoretical calculation | |
| Zhang et al. | Eu 2+/Eu 3+-emission-ratio-tunable CaZr (PO 4) 2: Eu phosphors synthesized in air atmosphere for potential white light-emitting deep UV LEDs | |
| Liang et al. | Controllable two-dimensional luminescence tuning in Eu 2+, Mn 2+ doped (Ca, Sr) 9 Sc (PO 4) 7 based on crystal field regulation and energy transfer | |
| EP3049505B1 (en) | New nitridoalumosilicate phosphor for solid state lighting | |
| Dong et al. | Improved luminescence properties of a novel red dodec-fluoride phosphor Ba 3 Sc 2 F 12: Mn 4+ with extraordinary thermal stability for WLED application | |
| CN104627972B (en) | A kind of preparation method of phosphatization powder for lithium | |
| CN103484112B (en) | Rare-earth europium-activated single-component white-light fluorescent powder and preparation method thereof | |
| WO2015135888A1 (en) | Supertetrahedron phosphor for solid-state lighting | |
| CN111518551A (en) | Mn-doped steel wire4+High-color-purity fluoride red-light material and preparation method thereof | |
| Zhao et al. | Novel Cr3+-activated far-red emitting phosphors with β-Ca3 (PO4) 2-type structure for indoor plant cultivation | |
| Wu et al. | Low-temperature preparation of monodispersed Eu-doped CaTiO 3 LED phosphors with controllable morphologies | |
| Zhang et al. | Syntheses of three members of A (II) M (IV)(PO 4) 2: luminescence properties of PbGe (PO 4) 2 and its Eu 3+-doped powders | |
| Wu et al. | Enhancing photoluminescence properties of Mn4+‐activated Sr4− xBaxAl14O25 red phosphors for plant cultivation LEDs | |
| Zhang et al. | Relation between structure conversion and spectra-tuning properties of Eu 2+-doped strontium aluminate phosphor | |
| Wang et al. | Insights into a novel garnet-based yellowish-green phosphor: structure, luminescence properties and application for warm white light-emitting diodes | |
| CN102352245B (en) | Preparation method of Eu-doped aluminum-nitride-based fluorescent powder | |
| Zhou et al. | Design of highly efficient deep-red emission in the Mn 4+ doped new-type structure CaMgAl 10 O 17 for plant growth LED light | |
| Chao et al. | Synthesis, luminescence properties and theoretical calculations of La5BSi2O13: Dy3+ phosphor coatings for light-emitting diodes | |
| Pan et al. | Hydrothermally-mediated preparation and photoluminescent properties of Sr3Al2O6: Eu3+ phosphor | |
| CN114574938B (en) | Rare earth neodymium borate near-infrared luminescent crystal material and preparation method thereof | |
| CN100489055C (en) | Fluorescent material for converting ultraviolet light into red light and its production | |
| CN113201341A (en) | Alkali metal charge compensation type aluminum phosphate red luminescent material and preparation method and application thereof | |
| Ding et al. | Design of a nitridoalumosilicate red phosphor synthesized under mild conditions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |