CN116426281A - Single-matrix fluorescent powder for warm white light LED, and preparation method and application thereof - Google Patents
Single-matrix fluorescent powder for warm white light LED, and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of fluorescent powder materials, and particularly discloses single-matrix fluorescent powder for a warm white light LED, a preparation method and application thereof, wherein the single-matrix fluorescent powder has a chemical formula as follows: ca (Ca) 2 Y 1‑x‑ y TaO 6 :xTb 3+ ,yEu 3+ Wherein x is more than or equal to 0.08 and less than or equal to 0.24,0.02, y is more than or equal to 0.14; and fully and uniformly mixing the single-matrix fluorescent powder for the warm white LED with ultraviolet curing glue, smearing the mixture on an InGaN365nm ultraviolet chip, and then curing at a high temperature to obtain the warm white LED. Compared with the prior art, the fluorescent powder prepared by the invention has good thermal stability, avoids thermal quenching at high temperature, and can be stably used for preparing LEDs; ca is added with 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ The fluorescent powder is packaged on an InGaN365nm ultraviolet chip to prepare a warm white light emitting LED which emits strong warm white light under the voltage of 3.3V and has low color temperatureCct=4626k, high color rendering index ra=86, cie color coordinates (0.3604,0.3856), therefore the fluorescent powder of the invention has good application value in the warm white LED field.
Description
Technical Field
The invention relates to the technical field of fluorescent powder materials, in particular to single-matrix fluorescent powder for a warm white LED, and a preparation method and application thereof.
Background
The white light LED is used as a fourth generation light source, and has the advantages of high luminous intensity, low energy consumption, small volume, long service life and the like, wherein the fluorescent powder converted white light LED is widely applied to the fields of solid illumination and display, and becomes a hot spot for current scholars to study. Rare earth ions with special electronic structures have been widely used in the preparation of fluorescent powder due to their excellent luminescence properties, high luminescence efficiency, narrow luminescence spectrum and high color rendering index. To obtain white light, the current commercial method is to paint high-performance YAG to Ce on blue InGaN chip 3+ Yellow fluorescent powder YAG: ce 3+ The fluorescent powder emits yellow light under the excitation of the blue light chip, and the yellow light and the blue light are mixed together to form white light, but the device of the method has lower color rendering index and is easy to generate blue light leakage. Another method is to use Ultraviolet (UV) chip to smear blue, green and red fluorescent powder to mix the three primary colors, and prepare white light, but the method has the problem of reduced luminous efficiency due to the reabsorption effect of fluorescent powder with different colors and unmatched particle size. Currently, researchers want to prepare single-matrix phosphors that emit white light under ultraviolet excitation by co-doping luminescent ions, but such material systems are less.
Chinese patent application No. CN202211650272.7 discloses a single matrix warm white fluorescent powder and a preparation method thereof, and the chemical formula is Y x-y Ta 1- xO 2.5 -x:yBi 3+ Wherein x is more than or equal to 0.6 and less than or equal to 0.9,0.001 and y is more than or equal to 0.1. The fluorescent powder can be effectively excited by ultraviolet light, has high luminous intensity, stable chemical property and stable luminous color, can be assembled with an ultraviolet LED chip to form a white light LED device, and meets the requirements of various illumination light sources. But the color temperature of the phosphor is lower.
Chinese patent application number CN200310101629.7 discloses a phosphor capable of being effectively excited by ultraviolet, violet or blue LEDs to emit red light, a method for manufacturing the same, and an electric light source manufactured thereby. The chemical formula of the fluorescent powder is AaMOb, eux and Ry, wherein A is one or more of Sc, Y, la, gd, yb, lu, li, na, K, rb, cs, mg, ca, sr, ba, zn, cd and Ag; m is one or more of Cr, mo, W, V, nb, ta, ti, zr, hf; r is one or more of Ce, pr, nd, sm, tb, dy, ho, er, tm, cu and Mn; a is more than or equal to 0.1 and less than or equal to 4, b is more than or equal to 1 and less than or equal to 20,0.0001, x is more than or equal to 0.5, and y is more than or equal to 0 and less than or equal to 0.5. The manufacturing method comprises the following steps: the A, M, eu, R simple substance, compound or corresponding salt and fluxing agent are mixed and ground uniformly, and then are synthesized at high temperature and subjected to post-treatment. The fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency, uniformity, no impurity phase, stability and the like, and the preparation method is simple, pollution-free and low in cost. The fluorescent powder can be matched with ultraviolet, purple or blue LEDs to prepare a novel electric light source. But the phosphor is effectively excited by ultraviolet, violet or blue LEDs to be red-emitting and is not suitable for warm white LEDs.
Disclosure of Invention
In order to solve the technical problems, the invention provides single-matrix fluorescent powder for a warm white LED, and a preparation method and application thereof.
In order to achieve the above purpose, the invention is implemented according to the following technical scheme:
a first object of the present invention is to provide a single-matrix phosphor for a warm white LED, the single-matrix phosphor having a chemical formula: ca (Ca) 2 Y 1-x-y TaO 6 :xTb 3+ ,yEu 3+ Wherein x is more than or equal to 0.08 and less than or equal to 0.24,0.02, and y is more than or equal to 0.14.
Preferably, the x=0.16.
Preferably, x=0.16 and y=0.02.
The second object of the present invention is to provide a method for preparing single-matrix fluorescent powder for warm white light LED, comprising the following steps:
s1, according to Ca: y: ta: tb: the ratio of the amounts of Eu species is 2 (1-x-y): 1: x: weighing CaCO according to the proportion of y 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 、Eu 2 O 3 Placing in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing until mixingA powder; wherein x is more than or equal to 0.08 and less than or equal to 0.24,0.02, and y is more than or equal to 0.14;
s2, placing the mixed powder into a corundum crucible, then placing the corundum crucible into a 1500 ℃ high-temperature muffle furnace for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder;
s3, grinding the powder into powder to obtain the single-matrix fluorescent powder for the warm white LED.
The invention provides an application of single-matrix fluorescent powder for warm white light LEDs in preparing warm white light LEDs, wherein the single-matrix fluorescent powder for warm white light LEDs and ultraviolet curing glue are fully and uniformly mixed and smeared on an InGaN365nm ultraviolet chip, and then normal-temperature ultraviolet curing is carried out to prepare the warm white light LEDs.
Compared with the prior art, the invention has the following beneficial effects:
the invention prepares Tb with different concentrations 3+ ,Eu 3+ Ion doped Ca 2 YTaO 6 Fluorescent powder for regulating Tb 3+ ,Eu 3+ The doping concentration of ions can adjust the duty ratio of a red light wave band and a green light wave band of a spectrum, so as to regulate and control the color coordinate position of the ions;
the preparation method of the fluorescent powder is simple and can be used for high-efficiency and rapid production;
the fluorescent powder prepared by the invention has good thermal stability, avoids thermal quenching at high temperature, and can be stably used for preparing LEDs; ca is added with 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ The fluorescent powder is packaged on an InGaN365nm ultraviolet chip to prepare a warm white light emitting LED, the warm white light emitting LED emits strong warm white light under the voltage of 3.3V, the CCT=4626K of the low color temperature is achieved, the Ra=86 of the high color rendering index is achieved, and the CIE color coordinate is 0.3604,0.3856, so that the fluorescent powder has good application value in the field of warm white light LEDs.
Drawings
FIG. 1 (a) is Ca 2 Y 1-x TaO 6 :xmol％Tb 3+ XRD patterns of (x=8, 12, 16, 20, 24); (b) an enlarged XRD spectrum in the range of 30 DEG to 33 DEG for 2 theta.
FIG. 2 (a) is Ca 2 Y 0.84-y TaO 6 :0.16Tb 3+ ,ymol％Eu 3+ XRD patterns of (y=2, 6, 10, 14); (b) an enlarged XRD spectrum in the range of 30 DEG to 33 DEG 2 theta.
FIG. 3 (a) is Ca 2 Y 0.84 TaO 6 :0.16Tb 3+ Scanning electron microscope pictures of fluorescent powder; and (b) - (f) are element energy spectra of Ca, Y, ta, O and Tb.
FIG. 4 (a) is Ca 2 Y 1-x TaO 6 :xTb 3+ PLE (light induced absorption spectrum) at normal temperature; (b) Ca (Ca) 2 Y 1-x TaO 6 :xTb 3+ PL (photoluminescence spectrum) at normal temperature.
FIG. 5 (a) is Ca 2 Y 0.84-y TaO 6 ；0.16Tb 3+ ,yEu 3+ Photoluminescence spectrum (PL) of the phosphor under 250nm excitation; (b) For Tb 3+ Luminescence main peak 551nm, eu 3+ And a light-emitting intensity contrast graph with a light-emitting main peak of 618 nm.
FIG. 6 is Ca 2 Y 0.84-y TaO 6 :0.16Tb 3+ ,yEu 3+ Doping with different Eu 3+ CIE color graph of phosphor at concentration.
FIG. 7 (a) is Ca 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ The luminous intensity at different temperatures of 300K-500K; (b) And carrying out normalization treatment by taking 300K at room temperature as a standard to obtain the dependence characteristic of the luminous intensity of the fluorescent powder at each temperature.
FIG. 8 (a) is a color coordinate (CIE 1931) of a prepared warm white LED; (b) Is an electroluminescence spectrum (EL) and a prepared warm white light LED physical image photo.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. The specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The following examples prepared single matrix phosphors for warm white LEDs using the following main raw materials: caCO (CaCO) 3 (AR, michelin Biochemical technologies Co., ltd.), Y 2 O 3 (99.9%, michelin Biochemical technologies Co., ltd.), ta 2 O 5 (99.9%, microphone technology Co., ltd.), tb 4 O 7 (99.9%, michelin technologies Co., ltd.) Eu 2 O 3 (99.9%, microphone technology Co., ltd.).
Example 1
According to Ca: y: ta: the ratio of the amounts of Tb to (1-x): 1: weighing CaCO according to the proportion of x 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 Placing the mixture in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing the mixture until mixed powder is obtained; wherein x=0.08, 0.12,0.16,0.2, 0.24; placing the mixed powder into a corundum crucible, then placing the corundum crucible into a high-temperature muffle furnace at 1500 ℃ for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder; grinding the powder into powder to obtain fluorescent powder Ca 2 Y 1-x TaO 6 :xTb 3+ 。
X-ray powder diffraction was used for Ca respectively 2 Y 1-x TaO 6 :xTb 3+ Characterization, ca 2 Y 1-x TaO 6 :xTb 3+ The XRD spectrum of the compound of (x= 0.08,0.12,0.16,0.2,0.24) is shown in (a) of fig. 1. Although Ca 2 YTaO 6 Crystals do not have JCPDS standard cards, but we can see all diffraction peaks observed with Ca 2 GdTaO 6 JCPDS (pdf#73-0085) card matching of compounds. The results show that Tb 3+ Successfully dope Ca into 2 YTaO 6 In the matrix material, and obtain Ca 2 YTaO 6 :Tb 3+ Single phase crystalline compounds. FIG. 1 (b) shows that with Tb 3+ The doping concentration of ions becomes larger and larger, and the diffraction peak of the sample moves to a low angle, which can be explained by the bragg formula λ=2dsinθ, due to Y in the crystal 3+ Ion radius (cn=6, r=0.09 nm) to Tb 3+ (cn=6, r=0.0923 nm) ion radius is small, at Tb 3+ Substituted for Y 3+ During (a) the lattice distortion expands, causing the diffraction peaks to shift to low angles.
To further analyze the morphology and composition of the phosphor, we performed further characterization analysis using (SEM-EDS) techniques, and figure 3 shows Ca 2 Y 0.84 TaO 6 :0.16Tb 3+ EDS element component cross-section of phosphor, FIG. 3 (a) shows SEM image of phosphor, SEM image shows Ca 2 Y 0.84 TaO 6 :0.16Tb 3+ The powder of (a) is irregular particles with an average particle size of about 10 microns, and the mapping energy spectrum surface scanning element distribution results are shown in fig. 3 (b) - (f), and the pictures show that Ca, Y, ta, O and Tb elements are uniformly distributed in the powder.
FIG. 4 shows Ca 2 Y 1-x TaO 6 :xTb 3+ PL (photoluminescence spectrum) and PLE (photo-excitation spectrum) at normal temperature, setting emission wavelength to 551nm green light, detecting excitation spectrum, and the result shows that FIG. 4 (a) excitation spectrum is composed of two parts, broad band of 220nm-280nm and sharp narrow band of 378nm, respectively, the broad peak of the former is attributed to Tb 3+ 4f-5d of (a) in the sequence of the first and second signals. The sharp narrow peak of the latter is due to Tb 3+ The 4f-4f forbidden transition of (C) has a strong broad peak at 378nm, indicating Ca 2 Y 1- x TaO 6 :xTb 3+ Is a potential UV-LED excited fluorescent powder. FIG. 4 (b) shows that the PL emission spectrum consists essentially of 4 narrow peaks at positions 495 nm,551nm,586nm,626nm under 250nm ultraviolet excitation. Respectively due to 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 ， 5 D 4 → 7 F 4 ， 5 D 4 → 7 F 3 And (5) transition. The data show that samples with different doping concentrations have similar emission spectrum curves and excitation spectrum curves, and when Tb is 3+ When the doping concentration is 16mol%, the emission spectrum and the absorption spectrum are the strongest, and when the doping concentration is higher than 16mol%, the luminous intensity is reduced, which can be attributed to concentration quenching effect, but due to similar Tb 3+ Non-relaxing radiation caused by energy transfer between ions.
Therefore, ca with the highest green light intensity can be selected 2 Y 0.84 TaO 6 :0.16Tb 3+ Reuse of Eu as matrix 3+ Doping and synthesizing a series of Ca 2 Y 0.84-y TaO 6 :0.16Tb 3+ ,yEu 3+ (y= 0.02,0.06,0.10,0.14) phosphor is specifically referred to in examples 2-5.
Example 2
According to Ca: y: ta: tb: the ratio of Eu to Eu is 2:0.7:1:0.46: weighing CaCO according to the proportion of 0.14 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 、Eu 2 O 3 Placing the mixture in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing the mixture until mixed powder is obtained; placing the mixed powder into a corundum crucible, then placing the corundum crucible into a high-temperature muffle furnace at 1500 ℃ for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder; grinding the powder into powder to obtain single-matrix fluorescent powder Ca for warm white LED 2 Y 0.7 TaO 6 :0.16Tb 3+ ,0.14Eu 3+ 。
Example 3
According to Ca: y: ta: tb: the ratio of Eu to Eu is 2:0.74:1:0.16:0.1 proportion of CaCO 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 、Eu 2 O 3 Placing the mixture in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing the mixture until mixed powder is obtained; placing the mixed powder into a corundum crucible, then placing the corundum crucible into a high-temperature muffle furnace at 1500 ℃ for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder; grinding the powder into powder to obtain single-matrix fluorescent powder Ca for warm white LED 2 Y 0.74 TaO 6 :0.16Tb 3+ ,0.1Eu 3+ 。
Example 4
According to Ca: y: ta: tb: the ratio of Eu to Eu is 2:0.78:1:0.16: weighing CaCO according to the proportion of 0.06 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 、Eu 2 O 3 Placing the mixture in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing the mixture until mixed powder is obtained; placing the mixed powder into a corundum crucible, then placing the corundum crucible into a high-temperature muffle furnace at 1500 ℃ for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder; grinding the powder into powder to obtain warm whiteSingle-matrix fluorescent powder Ca for light LED 2 Y 0.78 TaO 6 :0.16Tb 3+ ,0.06Eu 3+ 。
Example 5
According to Ca: y: ta: tb: the ratio of Eu to Eu is 2:0.82:1:0.16: weighing CaCO at a ratio of 0.02 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 、Eu 2 O 3 Placing the mixture in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing the mixture until mixed powder is obtained; placing the mixed powder into a corundum crucible, then placing the corundum crucible into a high-temperature muffle furnace at 1500 ℃ for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder; grinding the powder into powder to obtain single-matrix fluorescent powder Ca for warm white LED 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ 。
Phosphor Ca 2 Y 0.7 TaO 6 :0.16Tb 3+ ,0.14Eu 3+ 、Ca 2 Y 0.74 TaO 6 :0.16Tb 3+ ,0.1Eu 3+ 、Ca 2 Y 0.78 TaO 6 :0.16Tb 3+ ,0.06Eu 3+ 、Ca 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ The XRD diffraction pattern of (a) is shown in FIG. 2 (a), and the diffraction peaks and Ca are observed 2 The JCPDS standard card of LaTaO6 compound is similar, which shows that the fluorescent powder Ca is successfully obtained 2 Y 0.7 TaO 6 :0.16Tb 3+ ,0.14Eu 3+ 、Ca 2 Y 0.74 TaO 6 :0.16Tb 3+ ,0.1Eu 3+ 、Ca 2 Y 0.78 TaO 6 :0.16Tb 3+ ,0.06Eu 3+ 、Ca 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ Single-phase compound, FIG. 2 (b) shows that with Eu 3+ The doping concentration of ions becomes higher and higher, and the diffraction peak of the sample shifts to a low angle due to Eu 3+ Ion radius (cn=6, r=0.095 nm) to Y 3+ Ion radius (cn=6, r=0.09 nm) is large, at Eu 3+ Substituted for Y 3+ During (a) the lattice expands, causing the diffraction peaks to shift to low angles.
The fluorescent powder Ca 2 Y 0.7 TaO 6 :0.16Tb 3+ ,0.14Eu 3+ 、Ca 2 Y 0.74 TaO 6 :0.16Tb 3+ ,0.1Eu 3+ 、Ca 2 Y 0.78 TaO 6 :0.16Tb 3+ ,0.06Eu 3+ 、Ca 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ The luminescence spectra were observed under 250nm uv excitation and the color coordinate table changes were recorded on CIE1931 software (as shown in fig. 5). As can be seen from FIGS. 5 (a) and (b), eu doping is performed 3+ After that, the emission spectrum is more than 593nm,618nm and 705nm, which are respectively due to the strong emission peaks 5 D 0 → 7 F 0 ， 5 D 0 → 7 F 2 ， 5 D 0 → 7 F 3 ， 5 D 0 → 7 F 2 The transition emits light. At the same time we can find that Tb is maintained 3+ Ion doping concentration is unchanged, along with Eu 3+ Ion doping concentration is continuously increased, tb 3+ Is a decrease in the emission intensity, indicating Tb 3+ Ion energy to Eu 3+ Ion transfer energy, eu 3+ The ion maximum emission peak is 618nm, the luminous intensity is increased firstly and then decreased along with the increase of the doping concentration, and the luminous intensity is maximum when the doping concentration is 6mol percent.
As can be seen from FIG. 6, with Eu 3+ The increase in doping concentration of (c) and the movement of the CIE color coordinates from the green to the red and then to the red, has fully demonstrated that the adjustment of Tb 3+ ,Eu 3+ The doping concentration of ions can adjust the duty ratio of the red light wave band and the green light wave band of the spectrum, so that the color coordinate position of the spectrum can be adjusted and controlled, and the possibility of preparing the white light LED in the later stage is provided.
The thermal stability of the fluorescent powder is a key factor of LED application, and the LED chip can emit a large amount of heat under the working state, so that the actual temperature of the fluorescent powder is increased, and therefore, the fluorescent powder needs to have good thermal stability, and thermal quenching at high temperature is avoided. FIG. 7 (a) shows Ca 2 Y 0.82 TaO 6 :0.16Tb 3+ ,0.02Eu 3+ Emission spectrum of fluorescent powder under 250nm excitation. In the range of 300K to 500K, the luminous intensity decreases as the temperature increases. FIG. 7 (b) shows a normalized intensity comparison of the 551nm luminescence main peak at different temperatures. The temperature change test shows that the intensity of the fluorescent powder is 75% of the normal temperature (300K) at the high temperature of 500K, and the fluorescent powder is the LED fluorescent powder with good thermal stability and application potential.
Application example 1
And fully and uniformly mixing the single-matrix fluorescent powder for the warm white LED with ultraviolet curing glue, smearing the mixture on an InGaN365nm ultraviolet chip, and then performing normal-temperature ultraviolet curing to prepare the warm white LED.
The warm white LED was turned on with a 3.3V power supply to light, and a warm white LED with a low color temperature cct=4626k, a high color rendering index ra=86, and cie color coordinates (0.3604,0.3856) was prepared. Fig. 8 (a) is a CIE color coordinate diagram, chromaticity coordinates of the WLED are close to a white region center (0.333), fig. 8 (b) is an LED spectrum distribution diagram measured with a human eye visible spectrum as a range (400 nm-780 nm), and fig. 8 (b) is a diagram showing the WLED in a real object, and strong warm white light is emitted at a voltage of 3.3V.
In conclusion, the single-matrix fluorescent powder for the warm white LED has good application value in the warm white LED field.
The technical scheme of the invention is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the invention fall within the protection scope of the invention.
Claims (5)
1. A single-matrix fluorescent powder for a warm white LED is characterized in that: the chemical formula of the single-matrix fluorescent powder is as follows: ca (Ca) 2 Y 1-x- y TaO 6 :xTb 3+ ,yEu 3+ Wherein x is more than or equal to 0.08 and less than or equal to 0.24,0.02, and y is more than or equal to 0.14.
2. The single-matrix phosphor for warm white LEDs of claim 1, wherein: x=0.16.
3. The single-matrix phosphor for warm white LEDs according to claim 1 or 2, characterized in that: x=0.16 and y=0.02.
4. A method for preparing the single-matrix phosphor for warm white LEDs as claimed in claim 1, comprising the steps of:
s1, according to Ca: y: ta: tb: the ratio of the amounts of Eu species is 2 (1-x-y): 1: x: weighing CaCO according to the proportion of y 3 、Y 2 O 3 、Ta 2 O 5 、Tb 4 O 7 、Eu 2 O 3 Placing the mixture in an agate mortar, adding a small amount of absolute ethyl alcohol into the agate mortar, grinding and uniformly mixing the mixture until mixed powder is obtained; wherein x is more than or equal to 0.08 and less than or equal to 0.24,0.02, and y is more than or equal to 0.14;
s2, placing the mixed powder into a corundum crucible, then placing the corundum crucible into a 1500 ℃ high-temperature muffle furnace for sintering for 3 hours, and finally cooling the corundum crucible to room temperature along with the furnace to obtain powder;
s3, grinding the powder into powder to obtain the single-matrix fluorescent powder for the warm white LED.
5. Use of a single matrix phosphor for warm white LEDs as claimed in any one of claims 1 to 3 for the preparation of warm white LEDs, characterized in that: and fully and uniformly mixing the single-matrix fluorescent powder for the warm white LED with ultraviolet curing glue, smearing the mixture on an InGaN365nm ultraviolet chip, and then performing normal-temperature ultraviolet curing to prepare the warm white LED.
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Non-Patent Citations (1)
| Title |
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| JUN-XIAN MAI等: "Thermally stable single-phase double perovskite Ca2YTaO6: Tb3+, Eu3+ phosphor for warm white LEDs", pages 1 - 16 * |
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