CN117327490A - Bi-doped europium salt fluorescent powder and preparation method and application thereof - Google Patents

Bi-doped europium salt fluorescent powder and preparation method and application thereof Download PDF

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CN117327490A
CN117327490A CN202311268049.0A CN202311268049A CN117327490A CN 117327490 A CN117327490 A CN 117327490A CN 202311268049 A CN202311268049 A CN 202311268049A CN 117327490 A CN117327490 A CN 117327490A
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fluorescent powder
europium salt
doped europium
salt fluorescent
equal
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邱建备
陈才明
龙章文
周大成
王齐
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Kunming University of Science and Technology
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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
    • C09K11/7729—Chalcogenides
    • C09K11/7731—Chalcogenides with alkaline earth metals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24304—Metals or metalloids group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24306—Metals or metalloids transition metal elements of groups 3-10
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24318—Non-metallic elements
    • G11B2007/2432—Oxygen

Abstract

The invention discloses Bi-doped europium salt fluorescent powder, and a preparation method and application thereof, and belongs to the technical field of luminescent materials. The chemical formula of the Bi-doped europium salt fluorescent powder is Ba y SrEu 4 O 8 xBi; wherein y is the amount of Ba, y is more than or equal to 0.95 and less than or equal to 1, and x is the doping amount of Bi, and x is more than or equal to 0 and less than or equal to 0.05. The invention dopes Bi into Ba y SrEu 4 O 8 The color change is realized more quickly and obviously, and the color change and the color development are realized more efficiently. In addition, by selecting different doping ions and doping concentrations and changing excitation power, the color-changing degree can be adjusted, and the method can be used for erasable optical information recording and intelligent optical switches.

Description

Bi-doped europium salt fluorescent powder and preparation method and application thereof
Technical Field
The invention belongs to the technical field of luminescent materials, and particularly relates to Bi-doped europium salt fluorescent powder and a preparation method and application thereof.
Background
Under the external stimulus of light, electric field, magnetic field, temperature and the like, the lanthanide doped inorganic photoluminescent material with the fluorescence intensity capable of being modulated has great application potential in the fields of detection, sensing, anti-counterfeiting, biological probes and the like. Among these external stimuli, optical stimuli have the advantages of easy acquisition, easy control, and the like, and are ideal means of stimulation. Photochromic materials, which respond to light stimuli in at least one color change direction, have found applications in optical storage, optical switches, and the like. The lanthanide doped inorganic photochromic material has good luminous performance and photochromic performance, and the fluorescence intensity can be modulated based on the photochromic reaction. The material has very wide application prospect in the photoelectric field.
The existing photochromic materials are mainly divided into inorganic photochromic materials and organic photochromic materials. However, organic photochromic materials have limited applications due to slow reaction rates, susceptibility to aging, short duration, poor thermal stability, and the like. Compared with the organic photochromic material, the inorganic photochromic material has the advantages of high reaction speed, strong ageing resistance, long color changing time, good thermal stability and the like, but the existing inorganic photochromic material still has the defect of low reaction speed.
Disclosure of Invention
The invention mainly aims to provide Bi-doped europium salt fluorescent powder, a preparation method and application thereof, wherein Bi is doped into Ba obtained by europium salt material y SrEu 4 O 8 The xBi material generates color change under 365nm light excitation, and the color of the material is quickly restored to the original color after 365nm light is removed.
To achieve the above object, the present invention provides a Bi-doped europium salt phosphor having the chemical formula Ba y SrEu 4 O 8 xBi; wherein y is the amount of Ba, y is more than or equal to 0.95 and less than or equal to 1, and x is the doping amount of Bi, and x is more than or equal to 0 and less than or equal to 0.05.
As a further improvement of the invention, y is the amount of Ba, y is more than or equal to 0.95 and less than or equal to 0.999, and x is the doping amount of Bi, wherein x is more than 0.001 and less than or equal to 0.05.
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Mixing to obtain mixed powder, grindingAnd calcining and cooling to obtain the Bi-doped europium salt fluorescent powder.
As a further improvement of the invention, ethanol is added in the grinding, and the mass ratio of the ethanol volume to the mixed powder is as follows: 3-8 ml/3 g, and grinding time is 10-60min.
As a further improvement of the invention, the calcination temperature is 1500-1600 ℃ and the time is 4-20 hours, and the calcination atmosphere is air.
As a further improvement of the invention, the cooling rate is 1-3 ℃/min.
The invention also claims the application of the Bi-doped europium salt fluorescent powder in erasable optical information recording or intelligent optical switch.
The invention uses Ba y SrEu 4 O 8 As a matrix carrier, bi as a color-changing center, and the prepared Ba y SrEu 4 O 8 The photochromic and photoluminescent properties of the xBi fluorescent powder can meet the requirements of optical storage media. Because electron traps exist in the microstructure of the material, when the material receives illumination stimulus of a specific wave band, the matrix carrier absorbs energy, most of the energy is converted into photons by Eu luminescence centers to be released, and little of the energy is captured by oxygen vacancy defects in the matrix carrier to cause color change, so that Ba y SrEu 4 O 8 Electron trapping and detrapping in xBi oxygen vacancies leading to Ba y SrEu 4 O 8 xBi ceramics exhibit reversible photochromism from white or pale yellow to gray brown under alternating irradiation of 365nm ultraviolet light and natural light. For europium acid salt material, doping of Bi widens Ba y SrEu 4 O 8 And provides excited electrons. When Bi is doped, oxygen vacancy defects in the host carrier increase, resulting in enhanced discoloration effects. Furthermore, the degree of discoloration and bleaching is related to the illumination time.
In addition, oxygen defects form electron traps that capture excited electrons and become F-shaped color centers (defect sites in the crystal that selectively absorb visible light due to alkali diffusion). Photochromism in oxide semiconductors involves the migration of photogenerated electrons and holes in the semiconductor and the generation of color centers. Finally, the color center absorbs visible light and causes a color change.
The beneficial effects of the invention are as follows: the invention dopes Bi into Ba y SrEu 4 O 8 The color change is realized more quickly and obviously, and the color change and the color development are realized more efficiently. In addition, by selecting different doping ions and doping concentrations and changing, the color change degree can be adjusted, and the method can be used for erasable optical information recording and intelligent optical switches.
Drawings
FIG. 1 shows XRD patterns of Bi-doped europium salt phosphors prepared in examples 1-6 of the present invention.
FIG. 2 is a graphical representation of the color change of the Bi-doped europium salt fluorescent powder prepared in example 1 of the present invention before and after 60s irradiation under the shielding of a light-tight material with a square hollow middle and a light-tight material with a power density of 865 mW/cm at 365 nm.
FIG. 3 is a diffuse reflection absorption spectrum of the Bi-doped europium salt fluorescent powder prepared in example 1 of the present invention irradiated for 60s under the shielding of 365nm ultraviolet light with a power density of 865 mW per square centimeter by a light-tight material with a hollowed-out middle square.
FIG. 4 is a graphical representation of the color change of the Bi-doped europium salt fluorescent powder prepared in example 2 of the present invention before and after 60s irradiation under the shielding of a light-tight material with a square hollow middle and a light-tight material with a power density of 865 mW/cm at 365 nm.
FIG. 5 is a diffuse reflection absorption spectrum of the Bi-doped europium salt fluorescent powder prepared in example 2 of the present invention irradiated for 60s under the shielding of 365nm ultraviolet light with a power density of 865 mW per square centimeter by a light-tight material with a hollowed-out middle square.
FIG. 6 is a graphical representation of the color change of the Bi-doped europium salt fluorescent powder prepared in example 3 of the present invention before and after 60s irradiation under the shielding of a light-tight material with a square hollow middle and a light-tight material with a power density of 865 mW/cm at 365 nm.
FIG. 7 is a diffuse reflection absorption spectrum of the Bi-doped europium salt fluorescent powder prepared in example 3 of the present invention irradiated for 60s under the shielding of 365nm ultraviolet light with a power density of 865 mW per square centimeter by a light-tight material with a hollowed-out middle square.
FIG. 8 is a graphical representation of the color change of the Bi-doped europium salt fluorescent powder prepared in example 4 of the present invention before and after 60s irradiation under the shielding of a light-tight material with a square hollow middle and a light-tight material with a power density of 865 mW/cm at 365 nm.
FIG. 9 is a diffuse reflection absorption spectrum of the Bi-doped europium salt fluorescent powder prepared in example 4 of the present invention irradiated for 60s under the shielding of 365nm ultraviolet light with a power density of 865 mW per square centimeter by a light-tight material with a hollowed-out middle square.
FIG. 10 is a graphical representation of the color change of the Bi-doped europium salt fluorescent powder prepared in example 5 of the present invention before and after 60s irradiation under the shielding of a light-tight material with a square hollow middle and a light-tight material with a power density of 865 mW/cm at 365 nm.
FIG. 11 is a diffuse reflection absorption spectrum of the Bi-doped europium salt fluorescent powder prepared in example 5 of the present invention irradiated for 60s under the shielding of 365nm ultraviolet light with a power density of 865 mW per square centimeter by a light-tight material with a hollowed-out middle square.
FIG. 12 is a graphical representation of the color change of the Bi-doped europium salt fluorescent powder prepared in example 6 of the present invention before and after 60s irradiation under the shielding of a light-tight material with a square hollow middle and a light-tight material with a power density of 865 mW/cm at 365 nm.
FIG. 13 is a diffuse reflection absorption spectrum of the Bi-doped europium salt fluorescent powder prepared in example 6 of the present invention irradiated for 60s under the shielding of 365nm ultraviolet light with a power density of 865 mW per square centimeter by a light-tight material with a hollowed-out middle square.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the described embodiments are merely some, but not all embodiments of the present invention. Embodiments and features of embodiments in this application may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，25％BaCO 3 ，25％SrCO 3 ，0％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
As can be seen from fig. 2 to 3, the Bi-doped europium salt phosphor prepared in this example changes from white to light gray under uv irradiation, and returns to white color after one minute of natural light irradiation.
As can be seen from FIG. 1, the present invention successfully prepares Ba y SrEu 4 O 8 xBi material, no impurity peak, and high purity of the prepared material.
Example 2
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，24.75％BaCO 3 ，25％SrCO 3 ，0.25％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
As can be seen from fig. 4 to 5, the Bi-doped europium salt fluorescent powder prepared in this example changes from yellowish to grey brown under ultraviolet irradiation, and returns to yellowish in one minute under natural light irradiation.
Example 3
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，24.5％BaCO 3 ，25％SrCO 3 ，0.5％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
As can be seen from fig. 6 to 7, the Bi-doped europium salt fluorescent powder prepared in this example changes from yellowish to grey brown under ultraviolet irradiation and returns to yellowish under natural light irradiation for one minute.
Example 4
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，24.25％BaCO 3 ，25％SrCO 3 ，0.75％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
As can be seen from fig. 8 to 9, the Bi-doped europium salt fluorescent powder prepared in this example changes from yellowish to gray brown under ultraviolet irradiation and returns to yellowish under natural light irradiation for one minute.
Example 5
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，24％BaCO 3 ，25％SrCO 3 ，1％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
As can be seen from fig. 10 to 11, the Bi-doped europium salt phosphor prepared in this example changes from pale yellow to grey brown under ultraviolet irradiation, and returns to pale yellow under natural light irradiation for one minute.
Example 6
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，23.75％BaCO 3 ，25％SrCO 3 ，1.25％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
As can be seen from fig. 12 to 13, the Bi-doped europium salt phosphor prepared in this example changes from pale yellow to grey brown under uv irradiation and returns to pale yellow under natural light irradiation for one minute.
Example 7
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，22.5％BaCO 3 ，25％SrCO 3 ，2.5％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing the mixture in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 5ml, and the ratio of the ethyl alcohol to the ethyl alcohol is 3g, and grinding the mixture for 20min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
The Bi-doped europium salt fluorescent powder prepared in the embodiment changes from yellow to grey brown under the irradiation of ultraviolet light, and returns to yellow under the irradiation of natural light for one minute.
Example 8
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，24.95％BaCO 3 ，25％SrCO 3 ，0.05％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Placing in an agate mortar, adding absolute ethyl alcohol according to the volume of the ethyl alcohol, wherein the mass of the ethyl alcohol is 3ml, 3g, and grinding for 10min to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1600 ℃ and sintering for 4 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 1℃per minute.
The Bi-doped europium salt fluorescent powder prepared in the embodiment changes from white to light gray under the irradiation of ultraviolet light, and returns to white under the irradiation of natural light for one minute.
Comparative example 1
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，22％BaCO 3 ，25％SrCO 3 ，3％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder in the comparative example is the same as that in example 2.
The Bi doped europium salt fluorescent powder prepared in the comparative example changes from yellow to grey brown under ultraviolet irradiation, but the color change can be realized only under the irradiation of an ultraviolet lamp for a longer time than that of the embodiment, and the light can be recovered to light yellow after two minutes of natural light irradiation. In comparative example 1, too much Bi doping resulted in too much defects, the energy absorbed by the color center was instead reduced, and too much Bi resulted in the sample becoming very dark in color before and after discoloration, and the contrast was not obvious before and after discoloration.
Comparative example 2
A Bi-doped europium salt fluorescent powder comprises the following raw materials in mole percent: 50% Eu 2 O 3 ，24.995％BaCO 3 ，25％SrCO 3 ，0.005％Bi 2 O 3 。
The preparation method of the Bi-doped europium salt fluorescent powder comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 Grinding for 20min in an agate mortar to obtain mixed powder; transferring the mixed powder into a corundum crucible, placing the corundum crucible in an air atmosphere at 1500 ℃ and sintering for 6 hours, and cooling to room temperature to obtain Bi-doped europium salt fluorescent powder; wherein the heating rate is 5 ℃/min; the cooling rate was 3℃per minute.
The Bi doped europium salt fluorescent powder prepared in the comparative example changes from white to grey brown under ultraviolet irradiation, but the color change can be realized only under the irradiation of an ultraviolet lamp for a longer time than that of the embodiment, and the fluorescent powder can be recovered to white after two minutes of natural light irradiation. In comparative example 2, the raw materials ground without ethanol were insufficiently mixed, the sample synthesis reaction was insufficient, and the dispersion of Bi in the sample was not uniform enough, resulting in a slow photochromic reaction rate of the material.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.

Claims (7)

1. A Bi-doped europium salt fluorescent powder is characterized in that: the chemical formula of the catalyst is Ba y SrEu 4 O 8 xBi; wherein y is the amount of Ba, y is more than or equal to 0.95 and less than or equal to 1, and x is the doping amount of Bi, and x is more than or equal to 0 and less than or equal to 0.05.
2. The Bi-doped europium salt phosphor according to claim 1, wherein: y is the amount of Ba, y is more than or equal to 0.95 and less than or equal to 0.999, and x is the doping amount of Bi, wherein x is more than 0.001 and less than or equal to 0.05.
3. The method for preparing the Bi-doped europium salt fluorescent powder according to claim 1 or 2, which is characterized in that: the method comprises the following steps: eu is put into 2 O 3 、BaCO 3 、SrCO 3 、Bi 2 O 3 And uniformly mixing to obtain mixed powder, grinding, calcining, and cooling to obtain the Bi-doped europium salt fluorescent powder.
4. The method for preparing the Bi-doped europium salt fluorescent powder according to claim 3, wherein the method comprises the steps of: ethanol is added in the grinding, and the volume ratio of the ethanol to the total mass ratio of the mixed powder is as follows: 3-8 ml/3 g, and grinding time is 10-60min.
5. The method for preparing the Bi-doped europium salt fluorescent powder according to claim 3, wherein the method comprises the steps of: the calcination temperature is 1500-1600 ℃ and the calcination time is 4-20 hours, and the calcination atmosphere is air.
6. The method for preparing the Bi-doped europium salt fluorescent powder according to claim 3, wherein the method comprises the steps of: the cooling rate is 1-3 ℃/min.
7. Use of the Bi-doped europium salt fluorescent powder according to claim 1 or 2 in erasable optical information recording or intelligent optical switches.
CN202311268049.0A 2023-09-28 2023-09-28 Bi-doped europium salt fluorescent powder and preparation method and application thereof Pending CN117327490A (en)

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