CN114774123B - Mn (Mn) 4+ Doped strontium lanthanum gadolinium tantalate red fluorescent powder and preparation method and application thereof - Google Patents

Mn (Mn) 4+ Doped strontium lanthanum gadolinium tantalate red fluorescent powder and preparation method and application thereof Download PDF

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CN114774123B
CN114774123B CN202210382620.0A CN202210382620A CN114774123B CN 114774123 B CN114774123 B CN 114774123B CN 202210382620 A CN202210382620 A CN 202210382620A CN 114774123 B CN114774123 B CN 114774123B
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fluorescent powder
doped strontium
strontium lanthanum
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李涓
张箭健
车声雷
郑精武
乔梁
应耀
李旺昌
余靓
蔡伟
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Zhejiang University of Technology ZJUT
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Abstract

The invention disclosesMn (Mn) 4+ Doped strontium lanthanum gadolinium tantalate red fluorescent powder and preparation method and application thereof 2‑x La x GdTaO 6 :0.004Mn 4+ X is more than 0.001 and less than 2, the crystal structure is monoclinic phase, and the space group is P2 1 N, has wide excitation band of ultraviolet-near ultraviolet region, can emit 600-750nm red light and deep red light, has emission center of 668nm and 682nm, and can be used in combination with plant photosensitive pigment P R And P FR The absorption bands match. The strontium lanthanum gadolinium tantalate red fluorescent powder of the invention is prepared by adjusting Sr 2+ 、La 3+ The best proportion leads the crystal structure to be the monoclinic phase with the lowest symmetry, and the space group is P2 1 And/n. The astronomical selection rule is relaxed relative to other matrix materials, so that the luminescent ions Mn 4+ A kind of electronic device 2 E→ 4 A 2 The transition strength is improved, mn is enhanced 4+ Is a fluorescent emission property of (a).

Description

Mn (Mn) 4+ Doped strontium lanthanum gadolinium tantalate red fluorescent powder and preparation method and application thereof
Technical Field
The invention relates to the technical field of plant growth fluorescent materials, in particular to Mn 4+ Doped strontium lanthanum gadolinium tantalate red fluorescent powder and a preparation method and application thereof.
Background
The effect of light on plants is mainly expressed in two aspects: firstly, the plant energy source is used as the energy source for photosynthesis of plants; secondly, the whole growth and development process from germination to maturation of the plants is regulated by the photosensitizing pigment. Red lightIs the necessary light quality for the normal growth of plants, the demand quantity is at the beginning of various monochromatic light quality, while the deep red light plays an important role in the flowering and morphological response of plants, and the photosensitive pigment P closely related to the growth morphology of plants R And P FR The absorption section with the strongest light wave is in the red light region and the deep red light region of 660-730 nm. Significant stem elongation and leaf area growth can be observed in plants exposed to red light for a long period of time, so that it is important to prepare a novel red phosphor as an illumination lamp for promoting plant growth. The traditional red fluorescent powder for plant growth illumination mainly uses rare earth ions Eu 3+ Is luminescence center, compared with rare earth ion, transition metal Mn 4+ The price of the fluorescent powder is lower, the total product cost of the color light fluorescent powder is reduced, and the development concept of green environmental protection and energy conservation advocated worldwide at present is met.
Double perovskite type fluorescent powder A with rich octahedral environment 2 B’B”O 6 Is generally considered to be an ideal red light source. The ions B 'and B' are each together with six O 2- Ion composition [ B' O 6 ]Octahedron and [ B' O 6 ]Octahedron, which is luminescent ion Mn 4+ Providing a good crystal field environment; the A ion is located in the gap of the octahedron, and the change of the A ion can cause the change of the double perovskite crystal structure. For the double perovskite, the cubic phase structure has the highest symmetry, and in the cubic phase, the A-site cations in the octahedral gaps have an inhibitory effect on the tilt of the octahedron. When the A-site loose packing is aggravated, the inclination of the octahedron is caused, and the symmetry of the crystal structure is weakened. With the change of the A-site ions, the crystal form can change from cubic to tetragonal to orthorhombic to monoclinic, and the change process can be expressed as follows: a, a 0 a 0 a 0 (Fm-3m)→a 0 a 0 c - (I4/m)/a - a - a - (R-3)→a 0 b - b - (I2/m)→a - a - c + (P2 1 N) whose symmetry of the crystal decreases in turn.
Transition metal ion Mn 4+ The luminescence of (2) belongs to d-d transition, and the symmetry is higher in the crystal structure according to Laporte (Laporte) selection ruleMn in the matrix of (2) 4+ 3d of (2) 3 Electrons in the orbitals have the same number of angular quanta, so transitions between d-d orbitals are spatially forbidden. Can be at Mn 4+ The higher symmetry of the doped crystal structure was observed in the sample 2 E→ 4 A 2 The non-radiative and other excited state transitions are due to local vibrations caused by the coupling of electron transitions and molecular vibrations, where the spatially forbidden ring is broken, so that "transient" transitions can occur, but in this case the transition intensity is much smaller than for samples with low symmetry. The symmetry of the matrix is reduced, the space selection rule is relaxed, the probability and the intensity of d-d transition are greatly improved, and Mn is enhanced 4+ Is a fluorescent emission property of (a).
Mn which has been reported 4+ Activated red tantalate phosphor Ba with double perovskite structure 2 GdTaO 6 (cubic phase, space group Fm-3 m), ba 2 YTaO 6 (cubic phase, space group Fm-3 m), ca 2 YTaO 6 (orthorhombic phase, space group Pnma) crystal structure is not monoclinic phase with lowest symmetry, mn 4+ The fluorescence emission performance of (2) is not optimal.
Figure BDA0003592486840000021
Ion radius is less than->
Figure BDA0003592486840000022
At A 2 YTaO 6 Ca through the A-position 2+ And Ba 2+ Instead, the loose packing is increased, the crystal structure realizes the transformation from the cubic phase to the orthogonal phase, thereby enhancing Mn 4+ Is a fluorescent property of (a). Compared with Ba 2+ 、Ca 2+ The ion is used to generate a radical of the ion,
Figure BDA0003592486840000023
Figure BDA0003592486840000024
and->
Figure BDA0003592486840000025
Small radius, sr introduced in octahedral gaps 2+ 、La 3+ Ions, which can tilt octahedra, la 3+ The ions can also compensate the luminescence ions Mn 4+ Replacing oxygen vacancy defects brought by high valence cations. Due to La 3+ The ionic radius is smaller, the lattice distortion caused by the ionic radius is large, and Sr is regulated 2+ 、La 3+ The proportion of ions can further reduce the symmetry of the crystal structure, and a proper proportion is expected to form monoclinic P2 with the lowest symmetry of the crystal structure 1 N phase, release Mn to a great extent 4+ Is a fluorescent emission property of (a).
In addition, the existing red fluorescent powder Ca for plant growth illumination 2 ScSbO 6 、CaY 0.5 Ta 0.5 O 6 Although the ultraviolet light can be matched with a deep ultraviolet 310nm chip for manufacturing a plant lighting lamp, the price of the 310nm deep ultraviolet chip is more than 5 times of that of a 365nm near ultraviolet chip, and the cost is high.
In summary, search for Sr which is more suitable for plant growth and has low cost 2+ 、La 3+ The gadolinium tantalate red phosphor with the optimal proportion is very important.
Disclosure of Invention
A first object of the present invention is to provide an Mn which addresses the deficiencies of the prior art 4+ Doped strontium lanthanum gadolinium tantalate red phosphor.
The strontium lanthanum gadolinium tantalate red fluorescent powder provided by the invention has a monoclinic phase crystal structure and a space group of P2 1 And/n. Has wide excitation band of ultraviolet-near ultraviolet region, can emit 600-750nm red light and deep red light with emission centers of 668nm and 682nm, and can be used in combination with plant photosensitive pigment P R And P FR Matching an absorption band; the chemical general formula is Sr 2-x La x GdTaO 6 :0.004Mn 4+ Wherein 0.001 < x < 2.
A second object of the present invention is to provide Mn 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ The stoichiometric ratio of each element, wherein x is more than 0.001 and less than 2, respectively weighing SrCO 3 、La 2 O 3 、Gd 2 O 3 、Ta 2 O 5 、MnCO 3 Grinding into powder and mixing uniformly to obtain a mixture;
(2) Placing the mixture obtained in the step (1) in a muffle furnace, presintering for 1-2 hours at 1000-1200 ℃ under the atmosphere of oxygen, calcining for 1-2 hours at 1200-1500 ℃ and cooling to room temperature along with the furnace to obtain Mn 4+ Doped strontium lanthanum gadolinium tantalate red phosphor.
Preferably, srCO in the step (1) 3 Has a purity of 99.95%, la 2 O 3 Has a purity of 99.99%, gd 2 O 3 The purity of (C) is 99.9%, ta 2 O 5 Has a purity of 99.99%, mnCO 3 The purity of (2) was 99.95%.
Preferably, the heating rate and the cooling rate in the step (2) are 5-10 ℃/min.
Preferably, the pre-sintering temperature in the step (2) is 1200 ℃, and the pre-sintering time is 2 hours; the calcination temperature was 1500℃and the calcination time was 1 hour.
A third object of the present invention is to provide Mn 4+ Application of doped strontium lanthanum gadolinium tantalate red fluorescent powder in preparing plant growth fluorescent material.
Preferably, mn 4+ The doped strontium gadolinium tantalate red fluorescent powder is matched with a 365nm NUV-LED chip and is applied to preparing a plant growth LED illuminating lamp.
A third object of the present invention is to provide a plant growth LED lighting lamp, comprising Mn 4+ The doped strontium lanthanum gadolinium tantalate red fluorescent powder is matched with a 365nm NUV-LED chip to prepare the LED.
By combining all the technical schemes, the invention has the beneficial effects that:
(1) The strontium lanthanum gadolinium tantalate red fluorescent powder provided by the invention is prepared by adjusting Sr 2+ 、La 3+ The best proportion leads the crystal structure to be the monoclinic phase with the lowest symmetry, and the space group is P2 1 And/n. In relation to the other matrix materials,the astronomical selection rule is relaxed to make the luminescent ion Mn 4+ A kind of electronic device 2 E→ 4 A 2 The transition strength is improved, mn is enhanced 4+ Is a fluorescent emission property of (a).
(2) The strontium lanthanum gadolinium tantalate red fluorescent powder provided by the invention has a wide excitation band in an ultraviolet-near ultraviolet region, has an excitation spectrum range of 250-580nm, can emit 600-750nm red light and deep red light, and is closely related to plant growth morphology R And P FR The absorption section with the strongest light wave is covered, so that the growth state of the plant organism can be optimized, and the aim of shortening the growth period can be fulfilled.
(3) The strontium lanthanum gadolinium tantalate red fluorescent powder provided by the invention can be matched with a 365nm NUV-LED chip, and the practical use cost is low.
Drawings
FIG. 1 is a diagram showing the structure of red phosphor crystals obtained in example 2 of the present invention;
FIG. 2 is a graph showing the emission spectra of the red phosphors obtained in examples 2, 4, and 5 and comparative example 1 according to the present invention;
FIG. 3 shows the emission spectrum and the photosensitizing pigment P of the phosphor obtained in example 2 of the present invention R And P FR Is a comparison graph of the absorption spectrum of (a);
fig. 4 is a physical view and an energization-triggered graph of a light emitting device according to example 6 of the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Example 1
Mn (Mn) 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, wherein x=0.002, respectively weighing 99.95% of SrCO 3 99.99% La 2 O 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 99.95% MnCO 3 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
Example 2 of the embodiment
Mn (Mn) 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, wherein x=0.006, respectively weighing 99.95% of SrCO 3 99.99% La 2 O 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 99.95% MnCO 3 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
Example 3
Mn (Mn) 4+ Doped withThe preparation method of the strontium lanthanum gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, wherein x=0.012, respectively weighing 99.95% of SrCO 3 99.99% La 2 O 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 99.95% MnCO 3 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
Example 4
Mn (Mn) 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, wherein x=0.04, respectively weighing 99.95% of SrCO 3 99.99% La 2 O 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 99.95% MnCO 3 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
Example 5
Mn (Mn) 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, wherein x=1, respectively weighing 99.95% of SrCO 3 99.99% La 2 O 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 99.95% MnCO 3 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
Example 6
Mn (Mn) 4+ The application of the doped strontium gadolinium tantalate red fluorescent powder comprises the following steps:
(1) Sr is added 2-x La x GdTaO 6 :0.004Mn 4+ Compounding fluorescent powder with a 365nm NUV-LED chip, wherein x=0.006, and manually packaging to obtain a monochromatic light emitting diode (SLED) device;
(2) Triggering a single color light emitting diode (SLED) device was performed at a current of 50mA and a voltage of 3V.
Comparative example 1 (no La was added) 3+ )
Mn (Mn) 4+ The preparation method of the doped strontium gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to Sr 2 GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, respectively weighing 99.95% of SrCO 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
Comparative example 2 (no Sr added) 2+ )
Mn (Mn) 4+ The preparation method of the doped strontium gadolinium tantalate red fluorescent powder comprises the following steps:
(1) According to La 2 GdTaO 6 :0.004Mn 4+ Stoichiometric ratio of each element, respectively weighing 99.99% of La 2 O 3 99.9% Gd 2 O 3 99.99% Ta 2 O 5 The total mass is about 6 g;
(2) Weighing, placing in an agate mortar, and grinding for 2 hours to uniformly mix the powder raw materials to obtain a mixture;
(3) Placing the mixture obtained in the step (2) into a corundum crucible, placing the corundum crucible into a muffle furnace, preheating for 2 hours at 1200 ℃ in an oxygen atmosphere, calcining for 1 hour at 1500 ℃ to enable the mixture to perform solid phase reaction, and finally cooling to room temperature to obtain the corundum crucible.
The phosphors obtained in examples 1 to 6 and comparative examples 1 to 2 were subjected to various performance tests, respectively, the test results of which are shown in fig. 1 to 4, wherein:
FIG. 1 is a crystal structure diagram of the red phosphor obtained in example 2 of the present invention. Sr (Sr) 2-x La x GdTaO 6 :0.004Mn 4+ (x=0.006) is a typical double perovskite structure, belonging to the monoclinic system, the space group is P2 1 And/n. Gd, ta atoms in the primary unit cell are located in the octahedral center, each being linked to 6O atoms, [ GdO ] 6 ]/[TaO 6 ]The octahedrons are arranged alternately,
Figure BDA0003592486840000071
and->
Figure BDA0003592486840000072
Similar ionic radius of Mn 4+ The doping of the ions provides a good crystal field environment. The Sr atom and La atom are linked to 12O atoms and are located in the octahedral gap.
FIG. 2 is a graph showing the emission spectra of the red phosphors obtained in examples 2, 4, and 5 and comparative example 1 excited by a 345nm light source. It can be seen that compared with the comparative exampleBy adjusting Sr 2+ 、La 3+ The ratio of the sample has different degrees of improvement of fluorescence performance, wherein in example 2 (namely Sr 2-x La x GdTaO 6 :0.004Mn 4+ (x=0.006)) is the strongest; example 5 (i.e. Sr) 2- x La x GdTaO 6 :0.004Mn 4+ (x=1)) from 668nm to 725nm, and with phytochrome P FR The strongest absorption band is more matched, and plays an important role in plant flowering and morphological response.
FIG. 3 is Sr of example 2 2-x La x GdTaO 6 :0.004Mn 4+ (x=0.006) emission spectrum of phosphor and photosensitizing pigment P R And P FR Is a comparison of the absorption spectra of (a) and (b). The photopigments are closely related to the plant growth photopic morphology, with the strongest absorption bands in the red and deep red regions of 660-730 nm. The red light emission spectrum of the sample is obviously overlapped with the absorption spectrum of the photosensitive pigment, and the application prospect of the fluorescent powder as a plant growth LED illuminating lamp is shown.
Fig. 4 is a physical diagram and a power-on trigger diagram of a single color light emitting diode (SLED) device of example 6. The red emission can be clearly observed under the triggering of a current of 50mA and a voltage of 3V.
In the description of the present specification, a description referring to terms "one embodiment," "another embodiment," "other embodiments," or "first embodiment-xth embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, method steps or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, 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 modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims (8)

1. Mn (Mn) 4+ Doped strontium lanthanum gadolinium tantalate red fluorescent powder with monoclinic phase crystal structure and P2 space group 1 N, has ultraviolet-near ultraviolet excitation band, can emit 600-750nm red light and deep red light, has emission centers of 668nm and 682nm, and is used in combination with plant photosensitive pigment P R And P FR Matching an absorption band; characterized in that the chemical formula is Sr 2-x La x GdTaO 6 :0.004Mn 4+ Wherein x is more than 0.001 and less than or equal to 0.04.
2. A Mn as claimed in claim 1 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder is characterized by comprising the following steps of:
(1) According to Sr 2-x La x GdTaO 6 :0.004Mn 4+ The stoichiometric ratio of each element, wherein x is more than 0.001 and less than 2, respectively weighing SrCO 3 、La 2 O 3 、Gd 2 O 3 、Ta 2 O 5 、MnCO 3 Grinding into powder and mixing uniformly to obtain a mixture;
(2) Placing the mixture obtained in the step (1) in a muffle furnace, under the atmosphere of oxygen,presintering at 1000-1200deg.C for 1-2 hr, calcining at 1200-1500deg.C for 1-2 hr, and cooling to room temperature to obtain Mn 4+ Doped strontium lanthanum gadolinium tantalate red phosphor.
3. A Mn as defined in claim 2 4+ A preparation method of doped strontium lanthanum gadolinium tantalate red fluorescent powder is characterized in that SrCO in the step (1) 3 Has a purity of 99.95%, la 2 O 3 Has a purity of 99.99%, gd 2 O 3 The purity of (C) is 99.9%, ta 2 O 5 Has a purity of 99.99%, mnCO 3 The purity of (2) was 99.95%.
4. A Mn as defined in claim 2 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder is characterized in that the heating rate and the cooling rate in the step (2) are 5-10 ℃/min.
5. A Mn as defined in claim 2 4+ The preparation method of the doped strontium lanthanum gadolinium tantalate red fluorescent powder is characterized in that the presintering temperature in the step (2) is 1200 ℃, and the presintering time is 2 hours; the calcination temperature was 1500℃and the calcination time was 1 hour.
6. A Mn as claimed in claim 1 4+ Application of doped strontium lanthanum gadolinium tantalate red fluorescent powder in preparing plant growth fluorescent material.
7. The use according to claim 6, characterized in that a Mn according to claim 1 is used 4+ The doped strontium lanthanum gadolinium tantalate red phosphor is matched with a 365nm NUV-LED chip.
8. A plant-growing LED lighting lamp, characterized by a Mn according to claim 1 4+ The doped strontium lanthanum gadolinium tantalate red fluorescent powder is matched with a 365nm NUV-LED chip to prepare the LED.
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