CN113462392A - Up-conversion luminescent material - Google Patents
Up-conversion luminescent material Download PDFInfo
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- CN113462392A CN113462392A CN202110842564.XA CN202110842564A CN113462392A CN 113462392 A CN113462392 A CN 113462392A CN 202110842564 A CN202110842564 A CN 202110842564A CN 113462392 A CN113462392 A CN 113462392A
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- 150000001875 compounds Chemical class 0.000 claims description 30
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- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims description 12
- 229910016495 ErF3 Inorganic materials 0.000 claims description 10
- 229910052691 Erbium Inorganic materials 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910009520 YbF3 Inorganic materials 0.000 claims description 10
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 10
- QGJSAGBHFTXOTM-UHFFFAOYSA-K trifluoroerbium Chemical compound F[Er](F)F QGJSAGBHFTXOTM-UHFFFAOYSA-K 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
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- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 4
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7772—Halogenides
- C09K11/7773—Halogenides with alkali or alkaline earth metal
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- G—PHYSICS
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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- G01N21/64—Fluorescence; Phosphorescence
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6417—Spectrofluorimetric devices
- G01N2021/6421—Measuring at two or more wavelengths
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Abstract
The invention provides an up-conversion luminescent material, a security element comprising the up-conversion luminescent material, and a device and a method for detecting the up-conversion luminescent material and the security element. The up-conversion luminescent material has a pulse modulation color change effect.
Description
Technical Field
The invention belongs to the technical field of security and anti-counterfeiting, and particularly relates to an up-conversion luminescent material, an anti-counterfeiting element containing the up-conversion luminescent material, and a device and a method for detecting the up-conversion luminescent material and the anti-counterfeiting element.
Background
The up-conversion luminescent material can be applied to anti-counterfeiting identification of the valuable documents, the up-conversion luminescent material is added on the valuable documents by methods of printing, coating and the like, under the irradiation of an external light source, the up-conversion luminescent material can generate radiation signals, and the authenticity of the valuable documents or the commodities can be distinguished by detecting the radiation signals. The common up-conversion luminescent material has single luminescent characteristic, can be purchased from the market easily, and is easy to counterfeit by counterfeiters. Therefore, an up-conversion luminescent material is needed, so that the radiation signal of the up-conversion luminescent material is difficult to be identified and imitated by counterfeiters, and the anti-counterfeiting capability of the valuable documents is improved.
Disclosure of Invention
In order to achieve the above object, the present invention provides an up-conversion luminescent material, a security element comprising the up-conversion luminescent material, and a device and a method for detecting the up-conversion luminescent material and the security element. The up-conversion luminescent material provided by the invention has a pulse modulation color change effect, the luminescent effect of the up-conversion luminescent material is difficult to be identified and simulated by counterfeiters, and the anti-counterfeiting capability of the valuable documents can be improved.
The invention provides an up-conversion luminescent material, which has a chemical element composition shown in a general formula (I), wherein Bi-M-R-E-X (I) is shown in the specification:
m is at least one element of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr and Ba;
r is at least one element of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Yb and Lu;
e is at least one element of Ho, Er and Tm;
bi. M, R, E is 0.8-2: 0-1: 0.05-0.4: 0.001-0.05;
x is an element balancing the valence state of the general formula (I), and is at least one element of O, S, F, Cl, Br and I, and the mole number of the element in the general formula (I) is determined by the mole number of Bi, M, R and E in the general formula (I).
The up-conversion luminescent material has a pulse modulation color change effect, and when excited by a specific excitation light source, the up-conversion luminescent material simultaneously generates first emission light and second emission light; when the specific excitation light source is removed and the pulse excitation light source is used for excitation, the intensity ratio of the first emission light to the second emission light is increased along with the reduction of the pulse width of the excitation light source; when the pulse width of the pulse excitation light source is less than the critical pulse width tcWhen the color of the upconversion luminescent material is visible to the naked eye, the change of the intensity ratio of the first emission light to the second emission light causes the color change of the upconversion luminescent material, wherein the wavelength of the specific excitation light source is the same as that of the pulsed excitation light source.
In some embodiments, the specific excitation light source is an ultraviolet light source (wavelength 200-.
In certain embodiments, the critical pulse width tcFrom 0.001ms to 1000ms, for example 0.1 ms.
In certain embodiments, M in formula (I) according to the present invention is at least one element selected from Li, Na, Mg, and Ca.
In certain embodiments, R in formula (I) according to the present invention is at least one element selected from Y, Yb and Lu.
In certain embodiments, R in formula (I) described herein is Yb.
In certain embodiments, E in formula (I) according to the present invention is at least one element selected from Ho, Er and Tm.
In certain embodiments, E in formula (I) described herein is Er.
In certain embodiments, X in formula (I) described herein is O, F or a combination of the two.
In certain embodiments, X in formula (I) described herein is a combination of O and F.
In some embodiments, the molar ratio of Bi, M, R, E in the general formula (I) is 0.8-1.6: 0.2-1: 0.1-0.4: 0.01-0.04.
In some embodiments, the upconversion luminescent material according to the present invention has a chemical elemental composition represented by formula (II),
Bi-M-Yb-Er-O-F (II), wherein:
m is defined as the invention;
bi. Molar ratios between M, Yb, Er as described herein;
the number of moles of O and F in formula (II) is determined by the number of moles of Bi, M, Yb, Er in formula (II).
In certain embodiments, the molar ratio between Bi and O in formula (II) described herein is 1:2, and the number of moles of F is determined by the number of moles of M, Yb, Er in formula (II).
In certain embodiments, the upconversion luminescent material according to the present invention is prepared by a method comprising the steps of,
1) providing a compound containing a Bi element, a compound containing M, a compound containing R and a compound containing E, wherein the compounds contain X for balancing the valence of the compounds;
2) mixing and crushing a Bi element compound, an M-containing compound, an R-containing compound and an E-containing compound according to a required molar ratio, and calcining the crushed powder at the temperature of 600-800 ℃ for 4-6 hours; or
Calcining the crushed powder at the temperature of 600-800 ℃ for 2-3 hours, crushing the calcined product, and then calcining at the temperature of 600-800 ℃ for 2-3 hours;
3) cooling the product obtained in the step 2), and then grinding the product into powder;
4) optionally, washing the powder product obtained in the step 3) with ethanol and drying.
In certain embodiments, the Bi element-containing compound is Bi2O3。
In certain embodiments, the M-containing compound is NaF, CaF2、MgF2Or LiF.
At a certain pointIn some embodiments, the R-containing compound is YbF3。
In certain embodiments, the E-containing compound is ErF3。
The invention also provides application of the up-conversion luminescent material in preparation of anti-counterfeiting original paper.
The invention also provides a security element comprising a substrate and the upconversion luminescent material according to the invention.
In certain embodiments, the substrate is paper, ink, fiber, security thread, or plastic film.
In certain embodiments, the substrate is an ink.
In certain embodiments, the substrate is an ink and the upconverting luminescent material is mixed in the ink.
The anti-counterfeiting element has a pulse modulation color-changing effect, and when the anti-counterfeiting element is excited by a specific excitation light source, the anti-counterfeiting element simultaneously generates first emission light and second emission light; when the specific excitation light source is removed and the pulse excitation light source is used for excitation, the intensity ratio of the first emission light to the second emission light is increased along with the reduction of the pulse width of the excitation light source; when the pulse width of the pulse excitation light source is less than the critical pulse width tcWhen the color of the upconversion luminescent material is visible to the naked eye, the change of the intensity ratio of the first emission light to the second emission light causes the color change of the upconversion luminescent material, wherein the wavelength of the specific excitation light source is the same as that of the pulsed excitation light source.
The invention also provides a device for detecting the upconversion luminescent material or the anti-counterfeiting element, which comprises an excitation light source, a pulse signal generating device, an emission light collecting device and a data processing device, wherein:
an excitation light source for providing excitation light of a specific wavelength;
pulse signal generating means for supplying excitation light of a specific pulse width;
emission light collection means for collecting emission light of the light emitting element;
and the data processing device is used for processing the light-emitting signals of the light-emitting elements.
The invention also provides a method for detecting the upconversion luminescent material or the anti-counterfeiting element, which uses the device for detection, and comprises the following steps:
step 1, turning on an excitation light source to irradiate the up-conversion luminescent material or the anti-counterfeiting element, simultaneously turning off a pulse signal generating device, and detecting to obtain emission spectrums of first emission light and second emission light;
step 2, turning on the excitation light source and simultaneously turning on the pulse signal generating device, jointly irradiating the up-conversion luminescent material or the anti-counterfeiting element, and adjusting the pulse signal generating device to enable the pulse width of the excitation light to be smaller than the critical pulse width tcDetecting and obtaining emission spectrums of the first emission light and the second emission light at the moment;
step 3, respectively calculating the light intensity of the first emitted light and the light intensity of the second emitted light in the step 1 by using a data processing device, and calculating to obtain the light intensity ratio of the first emitted light and the second emitted light;
and 4, respectively calculating the light intensity of the first emitted light and the light intensity of the second emitted light in the step 2 by using a data processing device, and calculating to obtain the light intensity ratio of the first emitted light and the second emitted light.
In the present invention, the term "specific excitation light source" means an excitation light source with a wavelength in a specific range, such as a wavelength less than 400nm (e.g. 200-400nm), a wavelength at 400-750nm, a wavelength greater than 750nm, and preferably an excitation light source with a wavelength greater than 750 nm.
In the present invention, the term "pulse width" refers to the inverse of the pulse laser frequency f multiplied by the duty cycle d, i.e.: pulse width is (1/f) × d, where:
the frequency range of the pulse laser is 0.1-1000Hz, preferably 50-500 Hz;
the duty cycle ranges from 0.01% to 100%.
In the present invention, the term "critical pulse width tc" refers to a specific critical value of pulse width, when the pulse width of the pulsed excitation light source is smaller than the specific critical value, the change of the intensity ratio of the first emission light to the second emission light of the luminescent material can cause the macroscopic color change of the luminescent material. For example, the specific critical value may be 10ms,20ms,30ms or 50 ms. In certain embodiments, the critical pulse width tc is from 0.001ms to 1000ms, such as 0.1 ms.
The invention has the advantages of
When the radiation signal of the common luminescent material is used as the anti-counterfeiting characteristic, the radiation signal is easy to collect and imitate, and the anti-counterfeiting effect is lost. The invention solves the problem that the radiation signal is easy to collect and imitate when the radiation signal of the common luminescent material is used as the anti-counterfeiting characteristic.
The up-conversion luminescent material or the anti-counterfeiting element containing the up-conversion luminescent material has a pulse modulation color change effect. When excited by a specific excitation light source (for example, an excitation light source with the wavelength of 980nm), the upconversion luminescent material or the anti-counterfeiting element provided by the invention simultaneously generates a first emission light and a second emission light; when the specific excitation light source is removed and the pulse excitation light source with the same wavelength is used for excitation, the intensity ratio of the first emission light to the second emission light is increased along with the reduction of the pulse width of the excitation light source; when the pulse width of the pulse excitation light source is less than the critical pulse width tcWhen the intensity ratio of the first emitted light to the second emitted light changes, a colour change is caused which is visible to the naked eye by the upconversion luminescent material.
The up-conversion luminescent material and the anti-counterfeiting element containing the up-conversion luminescent material provided by the invention have the advantages that under the excitation of specific excitation light and pulse excitation light, the generated light intensity ratio is changed, or the generated light generates the fluorescent color change visible to the eyes, and the color change effect can be used as the identification basis of anti-counterfeiting characteristics and is used for identifying the authenticity.
The detection signal generated by the up-conversion luminescent material and the anti-counterfeiting element containing the up-conversion luminescent material provided by the invention is difficult to obtain by a counterfeiter and is difficult to imitate by other luminescent materials, and the anti-counterfeiting element has high concealment and confidentiality.
Drawings
Fig. 1 shows the emission spectrum of the security element 1 prepared in example 5 with a specific laser light having a wavelength of 980nm, the security element 1 simultaneously generating a first emission light and a second emission light, the ratio of the light intensities of the first emission light and the second emission light being 0.5, and the fluorescence color being orange-red.
Fig. 2 shows an emission spectrum of the light emitting element 1 prepared in example 5 under a pulsed laser having a wavelength of 980nm, the light emitting element 1 simultaneously generating a first emission light and a second emission light, the light intensity ratio of the first emission light and the second emission light being 1.08, and the fluorescence color being green.
Detailed Description
The following examples are presented to further illustrate the essence of the present invention, and it should be understood that the following examples are only illustrative of the present invention, but not intended to limit the scope of the present invention. The following examples, which do not indicate specific conditions, were conducted according to conventional conditions or as recommended by the manufacturer. The raw materials and instruments used are not indicated by manufacturers, and all the raw materials and instruments are conventional products which can be obtained commercially.
Although many of the materials and methods of operation used in the examples below are well known in the art, the invention is described in detail herein. It will be apparent to those skilled in the art that the materials and methods of operation used in the following examples are well known in the art, unless otherwise specified.
EXAMPLE 1 preparation of luminescent Material 1
Raw materials: bi2O3(AR),NaF(AR),YbF3(AR),ErF3(AR)
The synthesis steps are as follows:
1. weighing Bi2O3(0.78mol),NaF(0.22mol),YbF3(0.2mol), ErF3(0.02mol) as a raw material.
2. The raw materials are put into a mortar to be ground and uniformly mixed, then put into a corundum crucible to be burnt for 2 hours in a high-temperature furnace with the temperature of 600-700 ℃, the mixture is continuously burnt for 2 hours under the same conditions after being crushed, the mixture is ground into powder after being cooled, and the powder is washed and dried by ethanol to obtain the luminescent material 1.
EXAMPLE 2 preparation of luminescent Material 2
Raw materials: bi2O3(AR),CaF2(AR),YbF3(AR),ErF3(AR)
The synthesis steps are as follows:
1. weighing Bi2O3(0.78mol),CaF2(0.22mol),YbF3(0.4mol), ErF3(0.04mol) as a raw material.
2. The raw materials are put into a mortar to be carefully ground and uniformly mixed, then put into a corundum crucible, burned for 2 hours in a high-temperature furnace at the temperature of 700 plus 800 ℃, continuously burned for 2 hours under the same conditions after being crushed, cooled, ground into powder, cleaned by ethanol and dried to obtain the luminescent material 2.
Example 3 preparation of luminescent Material 3
Raw materials: bi2O3(AR),MgF2(AR),YbF3(AR),ErF3(AR)
The synthesis steps are as follows:
1. weighing Bi2O3(0.44mol),MgF2(1mol),YbF3(0.2mol), ErF3(0.02mol) as a raw material.
2. The raw materials are put into a mortar to be carefully ground and uniformly mixed, then put into a corundum crucible, burned for 6 hours in a high-temperature furnace at the temperature of 600-800 ℃, continuously burned for 2 hours under the same conditions after being crushed, cooled, ground into powder, cleaned by ethanol and dried to obtain the luminescent material 3.
Example 4 preparation of luminescent Material 4
Raw materials: bi2O3(AR),LiF(AR),YbF3(AR),ErF3(AR)
The synthesis steps are as follows:
1. weighing Bi2O3(0.44mol),LiF(1mol),YbF3(0.1mol), ErF3(0.01mol) as a raw material.
2. The raw materials are put into a mortar to be carefully ground and uniformly mixed, then put into a corundum crucible, burnt in a high-temperature furnace at 600-700 ℃ for 6 hours, cooled and ground into powder to obtain the luminescent material 4.
EXAMPLE 5 preparation of the Security element 1
Raw materials: luminescent Material 1 prepared in example 1, commercially available Normal offset white ink, commercially available Normal titanium white powder, commercially available Normal high boiling kerosene
The method comprises the following steps: weighing a proper amount of luminescent material 1, titanium dioxide, high-boiling-point kerosene and offset white ink, and uniformly mixing to obtain ink, wherein the proportion of the luminescent compound is 10% (mass ratio), the proportion of the titanium dioxide is 13% (mass ratio), the proportion of the high-boiling-point kerosene is 3% (mass ratio) and the proportion of the offset white ink is 74% (mass ratio);
step two: and (3) taking a proper amount of the ink obtained in the first step, printing the ink on common paper by offset printing, and naturally drying to prepare the light-emitting element 1.
EXAMPLE 6 preparation of the Security element 2
Raw materials: luminescent Material 4, gravure yellow ink-based ink, prepared in example 4
The method comprises the following steps: weighing a proper amount of the luminescent material 4 and gravure yellow ink base ink, and uniformly mixing to obtain the ink, wherein the luminescent compound accounts for 40% (mass ratio), and the gravure yellow ink base ink accounts for 60% (mass ratio);
step two: and (3) taking a proper amount of the ink obtained in the first step, printing the ink on common paper by gravure printing, and naturally drying to prepare the light-emitting element 2.
EXAMPLE 7 detection of the Security element 1
The device comprises the following steps: 980nm laser light source, pulse signal generating device, marine optical HR4000 fiber spectrometer, marine optical data processing software and commercially available common computer
The method comprises the following steps: the security element 1 prepared in example 5 was fixed to a detection device;
step two: turning on a 980nm excitation light source, simultaneously turning off a pulse signal generating device, and detecting to obtain a first light intensity ratio of the first emission light to the second emission light, wherein the light intensity ratio of the first emission light to the second emission light is about 0.5 and the fluorescence color is orange-red as shown in fig. 1;
step three: turning on a 980nm excitation light source, simultaneously turning on a signal generating device, setting the frequency of the pulse light source to be 100Hz and the pulse width to be 0.1ms, and detecting to obtain a second light intensity ratio of the first emission light to the second emission light, wherein as shown in FIG. 2, the light intensity ratio of the first emission light to the second emission light is 1.08, and the fluorescence color is green;
EXAMPLE 8 detection of the Security element 2
The device comprises the following steps: 980nm laser light source, pulse signal generating device, marine optical HR4000 fiber spectrometer, marine optical data processing software and commercially available common computer
The method comprises the following steps: the security element 2 prepared in example 6 was fixed to a detection device;
step two: opening a 980nm excitation light source, simultaneously closing a pulse signal generating device, and detecting to obtain a first light intensity ratio of first emitted light and second emitted light, wherein the light intensity ratio of the first emitted light and the second emitted light is 0.2, and the fluorescence color is orange red;
step three: and (3) opening a 980nm excitation light source, simultaneously opening a signal generating device, setting the frequency of the pulse light source to be 100Hz, setting the pulse width to be 0.1ms, detecting to obtain a second light intensity ratio of the first emission light to the second emission light, setting the light intensity ratio of the first emission light to the second emission light to be 0.4, and setting the fluorescence color to be yellow.
Claims (10)
1. An up-conversion luminescent material, the chemical element composition of which is shown in a general formula (I),
Bi-M-R-E-X (I), wherein:
m is at least one element of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr and Ba;
r is at least one element of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Yb and Lu;
e is at least one element of Ho, Er and Tm;
bi. M, R, E is 0.8-2: 0-1: 0.05-0.4: 0.001-0.05;
x is an element balancing the valence state of the general formula (I), and is at least one element of O, S, F, Cl, Br and I, and the mole number of the element in the general formula (I) is determined by the mole number of Bi, M, R and E in the general formula (I).
2. The upconversion luminescent material according to claim 1, wherein the upconversion luminescent material has a pulse modulation color change effect, and when excited by a specific excitation light source, the upconversion luminescent material simultaneously generates a first emission light and a second emission light; when the excitation light source is removed and the pulse excitation light source is used for excitation, the intensity ratio of the first emission light to the second emission light is along with the excitationA decrease in the pulse width of the light emitting source and an increase; when the pulse width of the pulse excitation light source is less than the critical pulse width tcWhen the color of the upconversion luminescent material is visible to the naked eye, the change of the intensity ratio of the first emission light to the second emission light causes the color change of the upconversion luminescent material, wherein the wavelength of the specific excitation light source is the same as that of the pulsed excitation light source.
3. The upconversion luminescent material according to claim 1, characterized in that any one or more of the following i) to v):
i) m is at least one element of Li, Na, Mg and Ca;
ii) R is at least one element of Y, Yb and Lu, preferably Yb;
iii) E is at least one element of Ho, Er and Tm, preferably Er;
iv) X is O, F or a combination of both, preferably a combination of O and F;
v) the molar ratio of Bi to M to R to E is 0.8-1.6: 0.2-1: 0.1-0.4: 0.01-0.04.
4. The up-conversion luminescent material according to any one of claims 1 to 3, which has a chemical element composition represented by the general formula (II),
Bi-M-Yb-Er-O-F (II), wherein:
m is as defined in claim 1 or 3;
bi. Molar ratios between M, Yb, Er according to claim 1 or 3;
the number of moles of O and F in formula (II) is determined by the number of moles of Bi, M, Yb, Er in formula (II),
preferably, the molar ratio between Bi and O is 1:2, the number of moles of F in formula (II) is determined by the number of moles of M, Yb, Er in formula (II),
preferably, the up-conversion luminescent material is prepared by a method comprising the following steps,
1) providing a compound containing a Bi element, a compound containing M, a compound containing R and a compound containing E, wherein the compounds contain X for balancing the valence of the compounds;
2) mixing and crushing a Bi element compound, an M-containing compound, an R-containing compound and an E-containing compound according to a required molar ratio, and calcining the crushed powder at the temperature of 600-800 ℃ for 4-6 hours; or
Calcining the crushed powder at the temperature of 600-800 ℃ for 2-3 hours, crushing the calcined product, and then calcining at the temperature of 600-800 ℃ for 2-3 hours;
3) cooling the product obtained in the step 2), and then grinding the product into powder;
4) optionally washing the powdered product obtained in step 3) with ethanol, drying,
preferably, the compound containing Bi is Bi2O3；
Preferably, the M-containing compound is NaF or CaF2、MgF2Or LiF;
preferably, the R-containing compound is YbF3；
Preferably, the E-containing compound is ErF3。
5. The up-conversion luminescent material according to any of claims 1 to 3, wherein the specific excitation light source is an ultraviolet light source (200-400 nm wavelength), a visible light source (400-750 nm wavelength) and an infrared light source (750 nm wavelength), preferably an infrared light source (750 nm wavelength, for example 980nm wavelength).
6. Up-converting luminescent material according to any of claims 1 to 3, characterized in that the critical pulse width tcFrom 0.001ms to 1000ms, for example 0.1 ms.
7. Use of the upconversion luminescent material according to any one of claims 1 to 6 in the preparation of a security element.
8. A security element comprising a substrate and an upconversion luminescent material according to any one of claims 1 to 6,
preferably, the substrate is paper, ink, fiber, security thread or plastic film;
preferably, the substrate is an ink,
preferably, the up-converting luminescent material is mixed in the ink.
9. An apparatus for detecting the upconversion luminescent material according to any one of claims 1 to 6 or the anti-counterfeiting element according to claim 8, comprising an excitation light source, a pulse signal generation device, an emission light collection device, and a data processing device, wherein:
an excitation light source for providing excitation light of a specific wavelength;
pulse signal generating means for supplying excitation light of a specific pulse width;
emission light collection means for collecting emission light of the light emitting element;
and the data processing device is used for processing the light-emitting signals of the light-emitting elements.
10. A method of detecting the upconversion luminescent material according to any one of claims 1 to 6 or the security element according to claim 8 using the device according to claim 9, comprising:
step 1, turning on an excitation light source to irradiate the up-conversion luminescent material or the anti-counterfeiting element, simultaneously turning off a pulse signal generating device, and detecting to obtain emission spectrums of first emission light and second emission light;
step 2, turning on the excitation light source and simultaneously turning on the pulse signal generating device, jointly irradiating the up-conversion luminescent material or the anti-counterfeiting element, and adjusting the pulse signal generating device to enable the pulse width of the excitation light to be smaller than the critical pulse width tcDetecting and obtaining emission spectrums of the first emission light and the second emission light at the moment;
step 3, respectively calculating the light intensity of the first emitted light and the light intensity of the second emitted light in the step 1 by using a data processing device, and calculating to obtain the light intensity ratio of the first emitted light and the second emitted light;
and 4, respectively calculating the light intensity of the first emitted light and the light intensity of the second emitted light in the step 2 by using a data processing device, and calculating to obtain the light intensity ratio of the first emitted light and the second emitted light.
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| CN110205127A (en) * | 2019-05-30 | 2019-09-06 | 西北大学 | A kind of NaBiF4:Yb3+,Er3+The preparation method of material |
| CN112126432A (en) * | 2020-09-14 | 2020-12-25 | 曲阜师范大学 | Yb-Er co-doped bismuth oxyfluoride compound up-conversion material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110205127A (en) * | 2019-05-30 | 2019-09-06 | 西北大学 | A kind of NaBiF4:Yb3+,Er3+The preparation method of material |
| CN112126432A (en) * | 2020-09-14 | 2020-12-25 | 曲阜师范大学 | Yb-Er co-doped bismuth oxyfluoride compound up-conversion material and preparation method thereof |
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