CN114149805B - Luminescent material, preparation method thereof and multiband optical temperature sensor - Google Patents

Luminescent material, preparation method thereof and multiband optical temperature sensor Download PDF

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CN114149805B
CN114149805B CN202010934798.2A CN202010934798A CN114149805B CN 114149805 B CN114149805 B CN 114149805B CN 202010934798 A CN202010934798 A CN 202010934798A CN 114149805 B CN114149805 B CN 114149805B
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rare earth
earth ion
luminescent material
ions
mixed solution
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CN114149805A (en
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钱艳楠
童翾
吴思萦
杨哲
周凯
张海燕
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Guangdong University of Technology
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    • C—CHEMISTRY; METALLURGY
    • 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
    • C09K11/7767—Chalcogenides
    • C09K11/7769—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • 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
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/20—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using thermoluminescent materials

Abstract

The application belongs to the technical field of optical materials, and particularly relates to a luminescent material, a preparation method thereof and a multiband optical temperature sensor. The present application provides a luminescent material comprising: the shell is wrapped on the periphery of the inner core; the inner core comprises a first rare earth ion doped MNbO 4 (wherein M represents any one element selected from lanthanoids); the shell comprises a second rare earth ion doped MNbO 4 (wherein M represents any one element selected from lanthanoids); the first rare earth ion and the second rare earth ion are respectively different rare earth ions. The luminescent material, the preparation method thereof and the multiband optical temperature sensor provided by the application can effectively fill the technical blank that no luminescent material with various spectrums and multi-section sensitive temperature performance exists at present.

Description

Luminescent material, preparation method thereof and multiband optical temperature sensor
Technical Field
The application belongs to the technical field of optical materials, and particularly relates to a luminescent material, a preparation method thereof and a multiband optical temperature sensor.
Background
In recent years, optical temperature sensors based on the Fluorescence Intensity Ratio (FIR) technology have been attracting attention with their excellent sensitivity and accuracy. FIR technology is typically implemented by comparing the fluorescence intensities of two thermally coupled energy levels of a Rare Earth (RE) ion. The technique is substantially immune to spectral loss and excitation intensity fluctuations and can provide more accurate temperature measurements. In addition, such an optical temperature sensor can detect a temperature at a distance from an object by detecting a relationship between fluorescence intensity and temperature. Therefore, the optical temperature sensor based on the FIR technology has greater advantages in the aspects of temperature monitoring of power stations, coal mines, oil refineries, fire buildings, turbine blades of spacecraft engines and the like. The common optical temperature sensor can only detect in a certain optical environment and a certain sensitive temperature,
at present, a luminescent material with multiple spectrums and multiple sections of sensitive temperature performance does not exist. Therefore, developing a luminescent material with multiple spectrums and multiple sections of sensitive temperature performance has important research significance and application value.
Disclosure of Invention
In view of the above, the luminescent material, the preparation method thereof and the multiband optical temperature sensor provided by the application can effectively fill the technical blank that no luminescent material with various spectrums and multi-section sensitive temperature performance exists at present.
The first aspect of the present application provides a luminescent material comprising: the shell is wrapped on the periphery of the inner core;
the inner core comprises a first rare earth ion doped MNbO 4 (wherein M represents any one element selected from lanthanoid elements); the shell comprises a second rare earth ion doped MNbO 4 (wherein M represents any one element selected from lanthanoid elements); the first rare earth ion and the second rare earth ion are respectively different rare earth ions.
Preferably, the first rare earth ion is selected from Er 3+ Ion, tm 3+ Ion, eu 3+ Ions, ho 3+ Ion, dy 3+ Ion, la 3+ Ion, ce 3+ Ion, pr 3+ Ions, nd 3+ Ions, pm 3+ Ions, sm 3+ Ions, gd 3+ Ion, tb 3+ Ion, yb 3+ Ions or Lu 3+ Any one of the ions; the second rare earth ion is selected from Er 3+ Ion, tm 3+ Ion, eu 3+ Ions, ho 3+ Ion, dy 3+ Ion, la 3+ Ion, ce 3+ Ion, pr 3+ Ions, nd 3+ Ions, pm 3+ Ions, sm 3+ Ions, gd 3+ Ion, tb 3+ Ion, yb 3+ Ions or Lu 3+ Any one of the ions.
Preferably, the number of layers of the shell is one, two, three, four or five.
Preferably, the number of layers of the shell is two; the shell comprises a second rare earth ion doped MNbO 4 Wherein M represents any one element selected from lanthanoid elements) and a third rare earth ion-doped MNbO 4 (wherein M represents any one element selected from lanthanoid elements); the first rare earth ion is Er 3+ Ions; the second rare earth ion is Tm 3+ Ion, the third rare earth ion is Eu 3+ Ions.
Specifically, the inner core is Er 3+ Ion doped ytterbium nitrate nanocrystals with thermally coupled energy levels in the visible green band 2 H 11/2 / 4 S 3/2 The method comprises the steps of carrying out a first treatment on the surface of the The first shell is Tm 3+ Ion doped ytterbium niobate nanocrystalline with thermal coupling energy level in visible blue light band 1 G 4(1) And 1 G 4(2) the method comprises the steps of carrying out a first treatment on the surface of the The second shell is Eu 3+ Ion doped ytterbium niobate nanocrystalline thermally coupled energy level transition in visible red light wave band 5 D 0 → 7 F J (J＝0,1,2,3,4)/ 5 D 0 → 7 F 2 。
The second aspect of the present application provides a method for preparing a luminescent material, comprising the steps of:
step 1, dissolving a first rare earth ion, an ytterbium source, a niobium source and a cosolvent in a solution to obtain a first mixed solution;
step 2, mixing the first mixed solution, performing heating reaction, and separating to obtain a first mixture;
step 3, calcining the first mixture to obtain the first rare earth ion doped MNbO 4 (wherein M represents any one element selected from lanthanoid elements);
step 4,Doping MNbO with ytterbium source, second rare earth ion, niobium source, cosolvent, solution and first rare earth ion 4 Wherein M represents any one element selected from lanthanoid elements to obtain a second mixed solution;
step 5, heating the second mixed solution for reaction, and separating to obtain a second mixture;
and 6, calcining the second mixture to obtain the first luminescent material.
Preferably, the preparation method further comprises:
step 7, mixing an ytterbium source, a third rare earth ion, a niobium source, a cosolvent, the first luminescent material and the solution to obtain a third mixed solution;
step 8, heating the third mixed solution for reaction, and separating to obtain a third mixture;
and 9, calcining the third mixture to obtain a second luminescent material.
Preferably, the first rare earth ion is Er 3+ Ions; the second rare earth ion is Tm 3+ Ion, the third rare earth ion is Eu 3+ Ions.
Preferably, the molar ratio of the erbium source, the thulium source, the europium source, the ytterbium source and the niobium source is (1 to 10): (3-7): (2-8): (29-50): (62-138).
Preferably, the heating temperature of the heating reaction is 250-300 ℃, and the heating reaction time is 6-24 hours; the calcination temperature is 950-1000 ℃, and the calcination time is 0.5-2 h.
Preferably, the solution is a mixed solution of water and glycol, and the volume ratio of the water to the glycol is 1 (1-2).
Preferably, the cosolvent is lithium hydroxide monohydrate or/and potassium hydroxide.
In a third aspect, the present application provides a multiband optical temperature sensor comprising the luminescent material or the luminescent material produced by the production method.
A fourth aspect of the application provides the use of said luminescent material in a multiband optical temperature sensor. The function of the multiband optical temperature sensor is realized by utilizing the fluorescence intensity ratio of two thermal coupling energy levels of different rare earth ions.
The application provides Rare earth ions (RE) with a core-shell structure 3+ ＝Er 3+ ，Tm 3+ ，Ho 3+ ，Eu 3+ And Dy 3+ Etc.) doped ytterbium niobate (YbNbO) 4 ) Is a light-emitting material of (a) and (b). The application discovers that the core-shell rare earth ion doped ytterbium niobate luminescent material (YbNbO) is prepared by adopting a hydrothermal method 4 :RE 3+ @YbNbO 4 :RE 3+ ，RE 3+ ＝Er 3+ ，Tm 3+ ，Ho 3+ ，Eu 3+ And Dy 3+ Etc.), the preparation method of the application can be carried out under the low temperature condition, and the process is simple. The application relates to a core-shell rare earth ion doped ytterbium niobate nanocrystal. Wherein the core comprises a core and a shell coated outside the core, and the core is YbNbO4:RE 3+ Nanocrystalline, shell is YbNbO different from kernel 4 :RE 3+ And (3) nanocrystalline. The ytterbium niobate nanocrystal has a special crystal structure and can provide a carrier for rare earth ion luminescence. Ytterbium niobate is an ABO 4 Ternary oxide has the advantages of good thermochemical performance, no pollution to the environment, high dielectric constant, low phonon frequency, photoelastic property, nonlinear optics and the like. By utilizing the fluorescence intensity ratio of two thermal coupling energy levels of different rare earth ions, the dependence relationship between the temperature and the optical intensity ratio is explored at the same time in multiple bands, so that the sensitivity and the accuracy of the optical temperature sensor are improved. According to the FIR technology, a core-shell structure is utilized, and rare earth ions Er are utilized 3+ Green light wave band thermal coupling energy level 2 H 11/2 / 4 S 3/2 Tm of rare earth ions 3+ Blue light band thermal coupling energy level 1 G 4(1) And 1 G 4(2) and the like, the optical temperature sensitivity can be simultaneously explored in different wave bands.
The present application is directed to overcoming the above-mentioned drawbacks of the prior art, and provides a luminescent material having a core-shell structure for a multiband optical temperature sensor, which can widen a spectral range of temperature detection and simultaneously detect sensitivity of the multiband temperature sensor.
Compared with the method of doping a plurality of rare earth ions at one time, the core-shell structure doped rare earth ions have the advantages that:
1. the luminescent material is in a nano level, the size of the nano particles is smaller, the specific surface area is large, a large number of luminescent centers are exposed on the surfaces of the particles, and when the luminescent centers are in an excited state, energy transfer is easy to occur between the luminescent centers and solvents, so that the up-conversion luminous efficiency is greatly reduced. The luminescent material with the core-shell structure can improve the luminescent efficiency of the up-conversion nano-particles, not only maintains the original characteristics of the core nano-particles, but also introduces a new shell layer to endow the nano-particles with new unique characteristics.
2. An inert layer is epitaxially grown on the outer layer of the bare core nanoparticle, so that lattice defects on the surface of the nanoparticle can be effectively passivated, the surface of the nanoparticle is isolated from the surrounding environment, and energy loss caused by energy transfer is reduced.
3. The luminescent material with the core-shell structure can limit different types of rare earth ions to different layers, and regulate and control the interaction of ions inside the nano particles so as to reduce harmful cross relaxation.
4. By utilizing a core-shell structure, the spectral detection range of the optical temperature sensor is widened by fitting the thermal coupling fluorescence intensity ratios of different rare earth ions, and the sensitivity of the optical temperature sensor with different wave bands can be detected simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 shows YbNbO according to an embodiment of the application 4 :Er 3+ @YbNbO 4 :Tm 3+ SEM electron microscopy of (a);
FIG. 2 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ @YbNbO 4 :Tm 3+ XRD results of (2);
FIG. 3 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ Fluorescence spectrograms at different temperatures;
FIG. 4 is a schematic illustration of the present applicationYbNbO of the examples 4 :Er 3+ Is a fitting FIR graph;
FIG. 5 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ Temperature sensitivity maps of (2);
fig. 6 is a block diagram of a second luminescent material according to an embodiment of the application.
Detailed Description
The application provides a luminescent material, a preparation method thereof and a multiband optical temperature sensor, which are used for filling the technical blank that no luminescent material with various spectrums and multi-section sensitive temperature performance exists at present.
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Wherein, the raw materials or reagents used in the following examples are all commercially available or self-made.
Example 1
The embodiment of the application provides a first luminescent material, and the preparation method comprises the following steps:
1. mixing ytterbium nitrate pentahydrate, erbium nitrate pentahydrate, niobium pentoxide and lithium hydroxide monohydrate with water, and adding ethylene glycol to obtain a first mixed solution; the volume ratio of water to glycol is 1:2;
2. transferring the first mixed solution into a reaction kettle, ball milling for 8 hours, reacting for 12 hours at 250 ℃, separating, drying to obtain white powder, calcining for 1 hour at 950 ℃ to obtain erbium ion doped ytterbium niobate nanocrystal (core YbNbO) 4 :Er 3+ )；
3. Mixing ytterbium nitrate pentahydrate, thulium nitrate pentahydrate, niobium pentoxide, lithium hydroxide monohydrate and erbium ion doped ytterbium niobate nanocrystals with water, and adding ethylene glycol to obtain a second mixed solution;
4. transferring the second mixed solution into a reaction kettle, ball-milling for 8 hours, reacting for 12 hours at 250 ℃,separating, drying to obtain white powder, calcining at 950 deg.C for 1 hr to obtain first luminescent material, labeled YbNbO 4 :Er 3+ @YbNbO 4 :Tm 3+ (nanocrystalline with core-shell two layers, core YbNbO) 4 :Er 3+ The shell is YbNbO 4 :Tm 3+ ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein the mole ratio of erbium element, thulium element, ytterbium element and niobium element is 1.3:3.2:32:67;
5. YbNbO of the embodiment of the application 4 :Er 3+ Fluorescence spectrum analysis and XRD analysis at different temperatures gave the results shown in FIGS. 1 and 2.
YbNbO of the embodiment of the application 4 :Er 3+ @YbNbO 4 :Tm 3+ SEM analysis and XRD analysis were performed, and the results are shown in fig. 1 and 2. FIG. 1 shows YbNbO according to an embodiment of the application 4 :Er 3+ @YbNbO 4 :Tm 3+ SEM electron microscopy of (a); FIG. 2 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ @YbNbO 4 :Tm 3+ XRD results of (a).
As shown in FIG. 1, the first luminescent material of the embodiment of the application is spherical, has a core-shell two-layer nanocrystal, and comprises a core and a shell coated on the core, namely YbNbO 4 :Tm 3+ Wrapped in YbNbO 4 :Er 3+ . As shown in FIG. 2, the first luminescent material according to the embodiment of the present application, a is a standard ytterbium niobate card, b is the first luminescent material according to the embodiment of the present application, and the prepared sample is YbNbO 4 :Er 3+ @YbNbO 4 :Tm 3+ And (3) nanocrystalline.
6. And (3) taking fluorescence spectrum analysis, FIR graph analysis and temperature sensitivity analysis of the erbium ion doped ytterbium niobate nanocrystal in the step (2) at different temperatures. FIG. 3 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ Fluorescence spectrograms at different temperatures; FIG. 4 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ Is a fitting FIR graph; FIG. 5 is a view of YbNbO according to an embodiment of the application 4 :Er 3+ Temperature sensitivity maps of (2).
As shown in FIG. 3, the YbNbO is prepared by excitation with 980nm excitation light source 4 :Er 3+ 530 and 558nmAre respectively corresponding to Er 3+ Of ions 2 H 11/2 → 4 I 15/2 And 4 S 3/2 → 4 I 15/2 the radiation transitions while it was observed that the 530nm wavelength up-converted green light increased with increasing temperature, whereas the 558nm wavelength up-converted green light decreased with increasing temperature. As shown in fig. 4, in the range of 120-280K, the green fluorescence intensity ratio is derived from a fitted curve, the fitted equation is fir=5.99 x exp (-454.96/T), where Δe/k= 454.96; in the temperature range of 120-280K, the temperature resolution is improved continuously along with the temperature rise. At 220K, the temperature sensitivity is at most 0.00712K -1 。
7. As can be seen from the same analysis, tm 3+ Ion doped ytterbium niobate nanocrystalline with thermal coupling energy level in visible blue light band 1 G 4(1) And 1 G 4(2) . By utilizing a core-shell structure, the sensitivity of the optical temperature sensor in different wave bands can be detected simultaneously by fitting the thermal coupling fluorescence intensity ratios of different rare earth ions.
Example 2
The embodiment of the application provides a second luminescent material, and the preparation method comprises the following steps:
1. the first luminescent material (YbNbO) obtained in example 1 4 :Er 3+ @YbNbO 4 :Tm 3+ ) Ytterbium nitrate pentahydrate, europium nitrate pentahydrate, niobium pentoxide and lithium hydroxide monohydrate are dissolved in water, and then ethylene glycol is added to obtain a first mixed solution; the volume ratio of water to glycol is 1:2;
2. transferring the first mixed solution into a reaction kettle, ball-milling for 8 hours, reacting for 12 hours at 250 ℃, separating, drying to obtain white powder, calcining for 1 hour at 950 ℃ to obtain a second luminescent material which is YbNbO 4 :Er 3+ @YbNbO 4 :Tm 3+ @YbNbO 4 :Eu 3+ Nanocrystalline with core-shell three layers, respectively core YbNbO 4 :Er 3+ The first shell is YbNbO 4 :Tm 3+ The second shell is YbNbO 4 :Eu 3+ . Wherein, erbium element, thulium element, europium element, ytterbium element and niobiumThe molar ratio of the elements to the sum is 1.3:3.2:2.3:48:96.
the structure of the luminescent material according to the embodiment of the application is shown in fig. 6. Fig. 6 is a block diagram of a second luminescent material according to an embodiment of the application. The inner core is Er 3+ Ion-doped ytterbium niobate nanocrystals having thermally coupled energy levels in the visible green band 2 H 11/2 / 4 S 3/2 The method comprises the steps of carrying out a first treatment on the surface of the The first shell is Tm 3+ Ion doped ytterbium niobate nanocrystalline with thermal coupling energy level in visible blue light band 1 G 4(1) And 1 G 4(2) the method comprises the steps of carrying out a first treatment on the surface of the The second layer of shell is Eu 3+ Ion doped ytterbium niobate nanocrystalline thermally coupled energy level transition in visible red light wave band 5 D 0 → 7 F J (J＝0,1,2,3,4)/ 5 D 0 → 7 F 2 . Using different rare earth ions (Er) 3+ 、Tm 3+ And Eu 3+ ) The dependence relationship between the temperature and the optical intensity ratio is explored at the same time in multiple bands, so that the sensitivity and the accuracy of the optical temperature sensor are improved. According to the FIR technology, a core-shell structure is utilized, and rare earth ions Er are utilized 3+ Green light wave band thermal coupling energy level 2 H 11/2 / 4 S 3/2 Tm of rare earth ions 3+ Blue light band thermal coupling energy level 1 G 4(1) And 1 G 4(2) the optical temperature sensitivity can be simultaneously explored in different wave bands.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.

Claims (8)

1. A luminescent material, comprising: the shell is wrapped on the periphery of the inner core;
the inner core comprises a first rare earth ion doped MNbO 4 Wherein M is Yb element; the shell comprises a second rare earth ion doped MNbO 4 Wherein M is Yb element; the first rare earth ion is Er 3+ Ions; the second rare earth ion is Tm 3+ Ions.
2. The luminescent material according to claim 1, wherein the number of layers of the envelope is one or two.
3. The luminescent material according to claim 2, wherein the number of layers of the outer shell is two; the shell comprises a second rare earth ion doped MNbO 4 MNbO doped with nanocrystalline and third rare earth ion 4 Wherein M is Yb element; the first rare earth ion is Er 3+ Ions; the second rare earth ion is Tm 3+ Ion, the third rare earth ion is Eu 3+ Ions.
4. A method for preparing a luminescent material, comprising the steps of:
step 1, dissolving a first rare earth ion, an ytterbium source, a niobium source and a cosolvent in a solution to obtain a first mixed solution;
step 2, heating the first mixed solution for reaction, and separating to obtain a first mixture;
step 3, calcining the first mixture to obtain the first rare earth ion doped MNbO 4 Wherein, M is Yb element;
step 4, doping ytterbium source, second rare earth ion, niobium source, cosolvent, solution and the first rare earth ion with MNbO 4 Obtaining a second mixed solution by mixing the nanocrystals, wherein M is Yb element;
step 5, heating the second mixed solution for reaction, and separating to obtain a second mixture;
step 6, calcining the second mixture to obtain a first luminescent material;
the first rare earth ion is Er 3+ Ions, the second rare earth ions are Tm 3+ Ions;
the solution is a mixed solution of water and glycol;
the cosolvent is lithium hydroxide monohydrate or/and potassium hydroxide.
5. The method of manufacturing according to claim 4, further comprising:
step 7, mixing an ytterbium source, a third rare earth ion, a niobium source, a cosolvent, the first luminescent material and the solution to obtain a third mixed solution;
step 8, heating the third mixed solution for reaction, and separating to obtain a third mixture;
step 9, calcining the third mixture to obtain a second luminescent material;
the third rare earth ion is Eu 3+ Ions;
the solution is a mixed solution of water and glycol;
the cosolvent is lithium hydroxide monohydrate or/and potassium hydroxide.
6. The preparation method according to claim 4 or 5, wherein the heating temperature of the heating reaction is 250 ℃ to 300 ℃, and the heating reaction time is 6 to 24 hours; the calcination temperature is 950-1000 ℃, and the calcination time is 0.5-2 h.
7. The method according to claim 4 or 5, wherein the volume ratio of the water to the ethylene glycol is 1 (1-2).
8. A multiband optical temperature sensor comprising a luminescent material according to any one of claims 1 to 3 or a luminescent material produced by a production method according to any one of claims 4 to 7.
CN202010934798.2A 2020-09-08 2020-09-08 Luminescent material, preparation method thereof and multiband optical temperature sensor Active CN114149805B (en)

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