CN107557011B - Multi-wavelength emission phosphate fluorescent powder and preparation method thereof - Google Patents
Multi-wavelength emission phosphate fluorescent powder and preparation method thereof Download PDFInfo
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- CN107557011B CN107557011B CN201710784135.5A CN201710784135A CN107557011B CN 107557011 B CN107557011 B CN 107557011B CN 201710784135 A CN201710784135 A CN 201710784135A CN 107557011 B CN107557011 B CN 107557011B
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Abstract
The invention relates to the technical field of rare earth luminescent materials. A multi-wavelength emitting phosphate phosphor having the formula: (Ca)19‑xEux)M(PO4)16Wherein x is 0.001-0.1, and M is any one of Ti, Zr and Hf. Hair brushThe phosphate fluorescent powder with multiple wavelength emission has the advantages of taking phosphate as a matrix material, having good chemical stability and thermal stability, cheap and easily obtained raw materials and low sintering temperature.
Description
Technical Field
The invention relates to the technical field of rare earth luminescent materials, in particular to multi-wavelength emission phosphate fluorescent powder and a preparation method thereof.
Background
The white light LED is a solid electroluminescent device for converting electric energy into white light, has the advantages of energy conservation, environmental protection, high luminous efficiency, small volume, long service life, safety, convenient use and the like, is considered as a fourth generation illumination light source following incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps, is a green illumination light source in the 21 st century, and is a mainstream product in the future illumination market.
At present, white LEDs are mainly realized by the following three ways: combining a blue LED chip with a yellow fluorescent material; the purple light LED chip is combined with a tricolor fluorescent material; the blue LED chip is combined with red and green fluorescent materials. The three methods are low in price and simple in preparation process, wherein the combination of a blue LED chip and a yellow fluorescent material is the earliest and most mature method for research, and commercialization is realized. However, so far, it still has disadvantages such as lower color rendering index, higher color temperature, and is not used as indoor lighting. In order to improve the color rendering of white light LEDs, scientists in various countries have developed two other methods for realizing white light LEDs, including a combination of a blue light LED chip and red and green fluorescent materials, and a combination of a violet light LED chip and a three-primary-color fluorescent material.
At present, the emission wavelength of an InGaN chip is shifted to a near ultraviolet region, higher excitation energy can be provided for fluorescent powder, and the fluorescent powder can easily generate visible light after being excited, so that the fluorescent powder excited by ultraviolet light has a wide explorable variety and has a good development prospect. In addition, the method of combining the purple light LED chip and the tricolor fluorescent material can overcome the defects of low color rendering index and high color temperature, and the LED has stable luminous performance because the color is determined by the fluorescent powder. Therefore, the scheme of using near-ultraviolet InGaN chips and blue and yellow phosphors or combining with three-primary-color phosphors to realize white light has become a hot spot in the development of the white light LED industry at present. Multi-wavelength (red, green and blue) emission is then an indispensable component in this scheme.
Disclosure of Invention
The invention aims to provide multi-wavelength emission phosphate fluorescent powder with good chemical stability and thermal stability and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a multi-wavelength emitting phosphate phosphor having the formula: (Ca)19-xEux)M(PO4)16Wherein x is 0.001-0.1, and M is any one of Ti, Zr and Hf.
A preparation method of multi-wavelength emission phosphate fluorescent powder is characterized by comprising the following steps: (1) calcium carbonate, compound containing M, compound containing [ PO ]4]3-Compound and europium oxide according to the chemical formula (Ca)19-xEux)M(PO4)16Weighing the raw materials according to the molar ratio of (1), wherein x is 0.001-0.1, and M is any one of Ti, Zr and Hf to obtain a mixture; (2) and putting the mixture into a crucible, sintering for 2-7 hours in a high-temperature furnace at 1100-1250 ℃ in a reducing atmosphere, and cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
Further, the compound containing M is any one of titanium dioxide, zirconium dioxide and hafnium dioxide.
Further, the [ PO ] containing4]3-The compound is any one of diammonium hydrogen phosphate and ammonium dihydrogen phosphate.
Further, the reducing atmosphere is a nitrogen-hydrogen mixed gas or a CO atmosphere.
Compared with the prior art, the multi-wavelength emission phosphate fluorescent powder has the beneficial effects that: (1) the phosphor powder takes phosphate as a substrate material, and has the advantages of good chemical stability and thermal stability, cheap and easily obtained raw materials, low sintering temperature and the like; compared with sulfide fluorescent powder, the invention has good thermal stability; compared with silicate fluorescent powder, the invention has uniform particle size and lower sintering temperature. Compared with silicon-based nitrogen (oxide) phosphor, the invention has simple synthesis process, low sintering temperature and cheap and easily obtained raw materials; compared with aluminate fluorescent powder, the invention has the advantages of low preparation temperature, small particle size, high luminous brightness and luminous efficiency and stable physical and chemical properties; (2) the fluorescent powder of the invention realizes mixed multi-wavelength emission by introducing transition metal ions, any one of Zr, Ti and Hf, and calcining at high temperature under the reducing atmosphere condition, wherein divalent europium and trivalent europium coexist in the fluorescent powder.
Drawings
FIG. 1 is an excitation spectrum of the phosphor prepared in example 1 according to the present invention.
FIG. 2 is an excitation spectrum of the phosphor prepared in example 2 according to the present invention.
FIG. 3 is an excitation spectrum of the phosphor prepared in example 3 according to the present invention.
FIG. 4 is an excitation spectrum of the phosphor prepared in example 4 according to the present invention.
FIG. 5 is an XRD pattern of the phosphor prepared in example 1 provided by the present invention.
Detailed Description
Example 1
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.999Eu0.001)Zr(PO4)16Weighing CaCO3、ZrO2、SiO2、NH4H2PO4And Eu2O3The molar ratio between them is 18.999: 1: 16: 0.0005, after fully grinding and uniformly mixing, placing the mixture in a corundum crucible, and then placing the corundum crucible in a high-temperature furnace at 5% H2+95％N2Roasting at 1100 ℃ for 7 hours in a nitrogen-hydrogen mixed atmosphere (volume ratio), and then cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
FIG. 1 is a diagram of the excitation spectrum of the phosphor of this embodiment with an excitation wavelength of 360nm, and it can be seen from FIG. 1 that the emission of the phosphor of this embodiment is a mixed multi-wavelength emission of divalent and trivalent europium, and the emission peaks are located near 415 and 615nm, which illustrates that the phosphor of this embodiment is suitable for being used as a multi-wavelength emission phosphor for ultraviolet and violet excitation. FIG. 5 is the XRD pattern of the phosphor in this example, and as can be seen from FIG. 5, the XRD pattern of the phosphor in this example shows the d value and the trend of the relative intensity change and Ca of the product19Ce(PO4)14(ICSD-83401) is consistent, the diffraction peak has relatively high intensity, and no diffraction peak of raw materials and impurities is seen, which indicates that the phosphor synthesized by the embodiment has high purity.
Example 2
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.9Eu0.1)Zr(PO4)16Weighing CaCO3、ZrO2、SiO2、NH4H2PO4And Eu2O3And the molar ratio between them is 18.9: 1: 16: 0.05, fully grinding and uniformly mixing, placing into a corundum crucible, placing into a high-temperature furnace, roasting at 1250 ℃ for 2 hours in a CO atmosphere, and then cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
FIG. 2 is a diagram of the excitation spectrum of the phosphor of this embodiment with an excitation wavelength of 360nm, and it can be seen from FIG. 2 that the emission of the phosphor of this embodiment is a mixed multi-wavelength emission of divalent and trivalent europium, and the emission peaks are located near 415 and 615nm, which illustrates that the phosphor of this embodiment is suitable for being used as a multi-wavelength emission phosphor for ultraviolet and violet excitation.
Example 3
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.95Eu0.05)Zr(PO4)16Weighing CaCO3、ZrO2、SiO2、NH4H2PO4And Eu2O3And friction between themThe molar ratio is 18.95: 1: 16: 0.025, placing the mixture into a corundum crucible after fully grinding and uniformly mixing, then placing the corundum crucible into a high-temperature furnace to be roasted for 5 hours at 1200 ℃ under the atmosphere of CO, and then cooling the mixture to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
FIG. 3 is a diagram of the excitation spectrum of the phosphor of this embodiment with an excitation wavelength of 360nm, and it can be seen from FIG. 3 that the emission of the phosphor of this embodiment is a mixed multi-wavelength emission of divalent and trivalent europium, and the emission peaks are located near 415 and 615nm, which illustrates that the phosphor of this embodiment is suitable for being used as a multi-wavelength emission phosphor for ultraviolet and violet excitation.
Example 4
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.999Eu0.001)Ti(PO4)16Weighing CaCO3、TiO2、SiO2、NH4H2PO4And Eu2O3The molar ratio between them is 18.999: 1: 16: 0.0005, after fully grinding and uniformly mixing, placing the mixture in a corundum crucible, and then placing the corundum crucible in a high-temperature furnace at 5% H2+95％N2Roasting at 1100 ℃ for 7 hours in a nitrogen-hydrogen mixed atmosphere (volume ratio), and then cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
FIG. 4 is a diagram of the excitation spectrum of the phosphor of this embodiment with an excitation wavelength of 360nm, and it can be seen from FIG. 4 that the emission of the phosphor of this embodiment is a mixed multi-wavelength emission of divalent and trivalent europium, and the emission peaks are located near 415 and 615nm, which illustrates that the phosphor of this embodiment is suitable for being used as a multi-wavelength emission phosphor for ultraviolet and violet excitation.
Example 5
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.9Eu0.1)Ti(PO4)16Weighing CaCO3、TiO2、SiO2、NH4H2PO4And Eu2O3And the molar ratio between them is 18.9: 1: 16: 0.05, fully grinding and uniformly mixing, placing into a corundum crucible, placing into a high-temperature furnace, roasting at 1250 ℃ for 2 hours in a CO atmosphere, and then cooling to room temperature to obtain the corundum crucibleTo multi-wavelength emission phosphate phosphors.
Example 6
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.95Eu0.05)Ti(PO4)16Weighing CaCO3、TiO2、SiO2、NH4H2PO4And Eu2O3And the molar ratio between them is 18.95: 1: 16: 0.025, placing the mixture into a corundum crucible after fully grinding and uniformly mixing, then placing the corundum crucible into a high-temperature furnace to be roasted for 5 hours at 1200 ℃ under the atmosphere of CO, and then cooling the mixture to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
Example 7
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.999Eu0.001)Hf(PO4)16Weighing CaCO3、HfO2、SiO2、NH4H2PO4And Eu2O3The molar ratio between them is 18.999: 1: 16: 0.0005, after fully grinding and uniformly mixing, placing the mixture in a corundum crucible, and then placing the corundum crucible in a high-temperature furnace at 5% H2+95％N2Roasting at 1100 ℃ for 7 hours in a nitrogen-hydrogen mixed atmosphere (volume ratio), and then cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
Example 8
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.9Eu0.1)Hf(PO4)16Weighing CaCO3、HfO2、SiO2、NH4H2PO4And Eu2O3And the molar ratio between them is 18.9: 1: 16: 0.05, fully grinding and uniformly mixing, placing into a corundum crucible, placing into a high-temperature furnace, roasting at 1250 ℃ for 2 hours in a CO atmosphere, and then cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
Example 9
A multi-wavelength emitting phosphate phosphor is disclosed, which is based on (Ca)18.95Eu0.05)Hf(PO4)16Weighing CaCO3、HfO2、SiO2、NH4H2PO4And Eu2O3And the molar ratio between them is 18.95: 1: 16: 0.025, placing the mixture into a corundum crucible after fully grinding and uniformly mixing, then placing the corundum crucible into a high-temperature furnace to be roasted for 5 hours at 1200 ℃ under the atmosphere of CO, and then cooling the mixture to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (5)
1. A multi-wavelength emitting phosphate phosphor, the phosphor having the formula: (Ca)19- xEux)M(PO4)16Wherein x is 0.001-0.1, and M is any one of Ti, Zr and Hf.
2. A preparation method of multi-wavelength emission phosphate fluorescent powder is characterized by comprising the following steps: (1) calcium carbonate, compound containing M, compound containing [ PO ]4]3-Compound and europium oxide according to the chemical formula (Ca)19-xEux)M(PO4)16Weighing the raw materials according to the molar ratio of (1), wherein x is 0.001-0.1, and M is any one of Ti, Zr and Hf to obtain a mixture; (2) and putting the mixture into a crucible, sintering for 2-7 hours in a high-temperature furnace at 1100-1250 ℃ in a reducing atmosphere, and cooling to room temperature to obtain the multi-wavelength emission phosphate fluorescent powder.
3. The method of preparing a multi-wavelength emission phosphate phosphor of claim 2, wherein: the compound containing M is any one of titanium dioxide, zirconium dioxide and hafnium dioxide.
4. The method of preparing a multi-wavelength emission phosphate phosphor of claim 2, wherein: said [ PO ] containing4]3-Compound (I)Is any one of diammonium hydrogen phosphate and ammonium dihydrogen phosphate.
5. The method of preparing a multi-wavelength emission phosphate phosphor of claim 2, wherein: the reducing atmosphere is nitrogen-hydrogen mixed gas or CO atmosphere.
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