CN102936497A - Main emission peak changeable and adjustable fluorescent material and preparation method thereof - Google Patents
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Abstract
The invention discloses a main emission peak changeable and adjustable fluorescent material and a preparation method thereof and relates to a light-emitting diode (LED) illuminating/displaying fluorescent material and a preparation method thereof. The fluorescent material is an alkaline earth oxygen fluorine silicon aluminum acid salt fluorescent material. The chemical general formula is Mx-zY6-x-y-zAl11-xLxO25.5-0.5kFk: yCe3+, zMn2+, wherein Ce3+ and Mn2+ are luminescence center ions, the x is larger than or equal to 0 and smaller than or equal to 1.5, the y is larger than or equal to 0.01 and smaller than or equal to 0.16, the z is larger than or equal to 0 and smaller than or equal to 0.2, the k is larger than 0 and smaller than or equal to 0.01, M is Mg2+ or Ba2+, L is Si4+ or Zr4+, according to the chemical general formula, MgO, MgF2, Al2O3, AlF3, SiO2, ZrO2, BaF2, BaCO3, MnCO3 and CeO2 are mixed in a closed container to obtain a mixture, and the mixture is subjected to heat preservation in a reduction furnace of 1620 DEG C at H2 atmosphere, cooling, crushing, grading and sieving to obtain the alkaline earth oxygen fluorine silicon aluminum acid salt fluorescent material. According to the fluorescent material and the preparation method thereof, the main emission peak of green, yellow and orange is changeable and adjustable, the fluorescent material is used for white light LED illuminating/displaying, under the excitation of blue light LED, high luminous efficiency can be achieved, and the wavelength is in a range from 530nm to 585nm.
Description
Technical field
The present invention relates to a kind of fluorescent material and preparation method thereof, particularly fluorescent material of the Application Areas such as a kind of LED illumination/demonstration and preparation method thereof.
Background technology
White light LEDs is a kind of New Solid green lighting technique of efficient, energy-saving and environmental protection, is described as the 4th generation of 21 century lighting source.The implementation of white light LEDs mainly contains: 1) adopt red, green, blue three primary colours chip to prepare White LED with high color rendering property; 2) adopt the InGaN blue-ray LED to excite yttrium aluminum garnet structure Y
3Al
5O
12: Ce (YAG:Ce
3+) yellow fluorescent powder; 3) adopt UV-LED to excite red, green, blue fluorescent material to prepare White LED with high color rendering property.From present White-light LED illumination Development Technology trend, the white light LEDs implementation mainly is converted into the master with fluorescence, and namely (450～470nm) excite yellow fluorescent powder YAG:Ce, (Ba, Sr) SiO by blue-ray LED
4: Eu
2+, i.e. blue-ray LED+yellow fluorescent powder; Or ultraviolet LED (380～400nm)) excitated blue, green and red fluorescence powder, namely purple LED+RGB phosphor combination obtains white light LEDs.Therefore, fluorescent material performance quality has played vital effect to light efficiency, light decay and the color developing etc. of white light LEDs.
CN201110309206.9 discloses the method that a kind of high temperature solid-state method prepares yttrium aluminum garnet structure YAG:Ce fluorescent RE powder, according to Y
3Al
5O
12: Ce fluorescent material chemical formula mol ratio takes by weighing Y
2O
3Or Gd
2O
3Or their mixture, Al
2O
3Or Ga
2O
3Or their mixture, CeO
2And fusing assistant, roasting is 2～6 hours in the High Temperature Furnaces Heating Apparatus reducing atmosphere, obtains the YAG:Ce fluorescent RE powder.
CN201110132661.6 discloses a kind of LED fluorescent material, this fluorescent material is with cerium, chromium ion or Ce+Cr mix the garnet phase material for activation center altogether, its element is at least a to be chosen from Y and rare earth, have at least a kind of from Al, Ga, In, Sc, choose among the V, in matrix, introduce the improvement that elemental vanadium is conducive to fluorescence efficiency, the introducing of vanadium helps to improve the perfection of lattice of host doped, simultaneously, vanadium mixes can play to the luminescence center in the matrix sensitized fluorescence effect, and the introducing of chromium more can bring the above abundant red fluorescence composition of 600nm, improves the demonstration of fluorescent material.
CN201110186964.6 discloses a kind of silicate yellow orange fluorescent powder, uses general formula Sr
2-x-y-zLu
yBa
zSiO
4: xEu
2+The material of expression forms, and x is the mole number of europium atom in the formula, and y is the mole number of lutetium atom, and z is the mole number of barium atom, 0.005≤x≤0.15,0.01≤y≤0.15,0≤z≤1.5.Blue-light excited lower at 460nm, its emmission spectrum is the banded spectral line that is positioned at 470～700nm, and along with the increase of barium incorporation, centre wavelength is mobile between 515～570nm.
Above-mentioned CN201110309206.9, the LED of CN201110132661.6 belongs to aluminate YAG:Ce system with fluorescent material; CN201110186964.6 belongs to silicate (Sr, Ba)
2SiO
4: Eu
2+Fluorescent material, the fluorescent material of CN201110132661.6 have added poisonous elemental chromium as light emitting ionic.
At present, the lighting source incandescent light that people use and the colour temperature of luminescent lamp generally all are lower than 6000K, the ability that has penetrating fog and steam because of low colour temperature light is strong, light is soft, the high plurality of advantages of road reflection rate, yet the emmission spectrum of commercial YAG:Ce fluorescent material, the emission main peak can only reach 560nm, the ruddiness composition is less, and (6000～8000K), colour rendering index is on the low side (＜80) to cause the colour temperature of white light LED part higher.Therefore, need to be orange by adding, color developing that red fluorescence powder improves white light LEDs.Although silicate fluorescent powder (Sr, Ba)
2SiO
4: Eu
2+Have emission main peak 515～570nm and change adjustable feature, but there is larger light decay in silicate material system fluorescent material, the shortcomings such as thermostability is low, particularly red light portion can only reach about 570nm, can not satisfy the requirement that improves the white light LEDs color developing far away.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of White-light LED illumination/demonstration to change with green, yellow, orange emission main peak adjustable, excite the lower fluorescent material of higher luminous efficiency, wavelength 530～585nm and preparation method thereof that has at blue-ray LED.
Of the present invention should extensively be alkaline earth fluorine oxygen silico-aluminate fluorescent material, and its chemical general formula is expressed as: M
X-zY
6-x-y-zAl
11-xL
xO
25.5-0.5kF
k: yCe
3+, zMn
2+, Ce wherein
3+And Mn
2+Be the luminescence center ion, in the general formula: 0≤x≤1.5,0.01≤y≤0.16,0≤z≤0.2,0＜k≤0.01; M is Mg
2+Or Ba
2+, L is Si
4+Or Zr
4+According to chemical general formula, with analytically pure MgO, MgF
2, NH
4F, Al
2O
3, AlF
3, SiO
2, ZrO
2, BaF
2, BaCO
3, MnCO
3And CeO
2, mix in chemical constitution ratio batching, batch mixing is 40 hours in encloses container, then with mixture at H
2Under %＜5% atmosphere, insulation is 6 hours in 1620 ℃ of reduction furnaces, and 500 eye mesh screens are crossed in cooling, broken classification, obtains granularity and be the alkaline earth fluorine oxygen silico-aluminate fluorescent material about 3～20 μ m.
There is a kind of Y in alkaline earth fluorine oxygen silicon zircoaluminate fluorescent material crystalline structure as shown in Figure 1 in this material system
3+Case, two kinds of Al
3+Case.Because Al
3+, Si
4+, Zr
4+Ionic radius is respectively 0.061,0.040 and 0.065nm, and Y
3+, Mg
2+, Ba
2+, Mn
2+And Ce
3+Ionic radius is respectively 0.089,0.072, and 0.135,0.08 and 0.13nm.According to the similar close principle of ionic radius, Si
4+, Zr
4+The preferential AlO that replaces in the alkaline earth fluorine oxygen silicon zircoaluminate fluorescent material crystalline structure
4And AlO
6Case, and Mg
2+, Ba
2+, Mn
2+And Ce
3+Plasma then replaces the YO in the alkaline earth fluorine oxygen silicon zircoaluminate fluorescent material crystalline structure
8Case.
Ce
3+The crystal field engery level cracking with coordination environment on every side considerable influence is arranged.Si
4+Electronegativity is 1.9, and Al
3+Electronegativity be 1.6.As a Si that electronegativity is larger
4+The Al that the ionic replacement electronegativity is less
3+The time, so that Ce
3+The covalency in ligand field strengthens on every side, causes Ce
3+Produce larger engery level cracking, minimum 5d orbital energy level d
1The energy level center of gravity obviously descends, thus so that Ce
3+Emission red shift appears.Same principle is worked as Zr
4+Replace Al
3+The time, because Zr
4+Electronegativity be 1.33 so that Ce
3+The covalency in ligand field reduces on every side, thereby has reduced Ce
3+The crystal field engery level cracking, minimum 5d orbital energy level d
1The energy level center of gravity obviously rises, thus so that Ce
3+Emission blue shift appears.
Therefore, according to above-mentioned mechanism, adjust Zr in the matrix components
4+, Si
4+Content, capable of regulating Ce
3+The residing crystal field splitting of case energy level size, thus make Ce
3+Emission of ions changes adjustable from green (530nm) to yellow (570nm).
Because Zr
4+, Si
4+Replace Al
3+During ion, will produce non-equivalence and replace, and easily form defective, thereby form luminous cancellation center, this point is very unfavorable to improving the rare-earth luminescent material luminous efficiency.Therefore, in fluorescent material system of the present invention, introduce alkaline earth ion such as Mg
2+, Ba
2+, adopt Mg
2+, Ba
2+Non-equivalence replaces Y
3+Case, thereby so that the fluorescent material crystalline structure keeps charge balance.
Yet, although by mixing Si
4+Can make Ce in the fluorescent material
3+Emission of ions from the 545nm red shift to 570nm about, but in order to improve the colour rendering index of low color temperature white light LED, need to be Ce
3+Launch further red shift.Because of Ce
3+Minimum 5d orbital energy level be positioned at blue light 460nm, in the blue-light excited lower higher luminous efficiency that has, yet, Mn
2+Although in some absorptions of 430nm, luminous more weak.Therefore, we design a kind of Ce in the present invention
3+And Mn
2+The fluorescent material system of mixing is altogether utilized Ce
3+→ Mn
2+Transmission ofenergy principle (ET) obtains the fluorescent orange material.At first pass through Ce
3+Ion d
1Orbital energy level absorbs blue light, then the radiationless Mn that passes to of energy
2+Ion
4T
1(G) the coupling energy level passes through Mn at last
2+ 4T
1(G) →
6A
1Energy level transition realizes the orange-colored light broadband emission, and the emission main peak is positioned at 585nm.
Alkaline earth fluorine oxygen silicon zircoaluminate fluorescent material of the present invention has higher luminous efficiency under blue-light excited, remedied simultaneously YAG:Ce fluorescent material and lacked the shortcomings such as red light portion.
Fig. 2,3 have provided respectively embodiment 1,2,3, XRD and the utilizing emitted light spectrogram of the fluorescent material of 4 preparations, by Fig. 2,3 as seen, adding a small amount of silicon does not affect this material crystals structure, and along with the Si content in the fluorescent material increases, emmission spectrum is from the 545nm red 570nm that moves to gradually.Fig. 4 has provided the fluorescent material scanning electron microscope sem photo of embodiment 1 preparation, and this fluorescent material is spherical particle, and grain graininess is between 3～10 μ m.Fig. 5,6 have provided encapsulation obtains white light LEDs utilizing emitted light spectrogram and chromaticity coordinate figure, and this white light LEDs excites lower at the 350mA electric current, colour temperature Tc=5823K, chromaticity coordinates X=0.3241, Y=0.3676, light efficiency are 121.5 lumens/watt, colour rendering index 78.5.
Fig. 7,8 have provided embodiment 5,6, and the fluorescent materials of 7 preparations excite, the utilizing emitted light spectrogram, when increasing along with Ce concentration, excite, gradually red shift of emmission spectrum.Fig. 9,10 have provided encapsulation obtains white light LEDs utilizing emitted light spectrogram and chromaticity coordinate figure, and this white light LEDs excites lower at the 350mA electric current, colour temperature Tc=5430K, chromaticity coordinates X=0.3352, Y=0.4072, light efficiency are 113.2 lumens/watt, colour rendering index 79.2.
Figure 11,12,13,14 have provided the fluorescent material XRD crystalline structure diffraction of embodiment 8 preparations, excite, utilizing emitted light spectrogram and X-ray fluorescence spectra (XPS).By doping Zr
4+Element, crystalline structure are substantially constant, but from Figure 14 fluorescent material x-ray photoelectron can spectrogram (XPS) find, in this material structure except Y, Al, O outside the Ce, has comprised Zr
4+And Mg
2+Deng element, Zr is described in the fluorescent material of the present invention
4+And Mg
2+Ion has entered in the lattice.From Ce
3+The excitation spectrum discovery, the 360nm excitation band obviously reduces, and Ce
3+The obvious blue shift of minimum 5d orbital energy level.Find at emmission spectrum equally, emmission spectrum gradually blue shift moves about 545nm, thereby realizes that the emmission spectrum blue shift obtains greener fluorescent material.Figure 15,16 have provided encapsulation obtains white light LEDs utilizing emitted light spectrogram and chromaticity coordinate figure, and this white light LEDs excites lower at the 350mA electric current, colour temperature Tc=5658K, chromaticity coordinates X=0.3282, Y=0.3818, light efficiency are 106.9 lumens/watt, colour rendering index 79.2.
Figure 17,18,19,20 have provided the fluorescent material XRD crystalline structure diffraction of embodiment 11 preparations, excite, utilizing emitted light spectrogram and X-ray fluorescence spectra (XPS).By doping Si
4+And Mn
2+Element, crystalline structure are substantially constant, but from Figure 20 fluorescent material x-ray photoelectron can spectrogram (XPS) find, in this material structure except Y, Al, O outside the Ce, has comprised Si
4+, Mn
2+Deng element, Si is described in the fluorescent material of the present invention
4+And Mg
2+Ion has entered in the lattice.From Ce
3+Excitation spectrum is found, three place's excitation bands occur altogether, be respectively 297,334 and the 462nm excitation band obviously reduce, wherein 297nm is from Mn
2+Excitation band, as shown in figure 18.Figure 19 has provided Ce
3+And Mn
2+Ion is mixed the utilizing emitted light spectrogram of fluorescent material altogether, find by the Gauss curve fitting swarming, this emission band main 530 and 585 and three emission bands of 733nm consist of, wherein the 530nm emission band is from Ce
3+5d →
2F
5/2Energy level transition, 585nm and 733nm are then from Mn
2+ 4T
1→
1A
6Energy level transition.Figure 21, Figure 22 have provided encapsulation and have obtained white light LEDs utilizing emitted light spectrogram and chromaticity coordinate figure, and this white light LEDs excites lower at the 350mA electric current, colour temperature Tc=3947K, and chromaticity coordinates X=0.4109, Y=0.4778, light efficiency are 98.5 lumens/watt, colour rendering index 86.6.
Description of drawings
Fig. 1 fluorescent material crystalline structure of the present invention schematic diagram;
The crystalline structure X diffractogram (XRD) of Fig. 2 embodiment 1,2,3,4 fluorescent materials;
Fig. 3 embodiment 1,2,3,4 fluorescent material emmission spectrum;
The fluorescent material scanning electron microscope (SEM) photograph (SEM) that Fig. 4 embodiment 1 obtains;
The white light LEDs spectrogram that Fig. 5 encapsulation obtains;
The white light LEDs chromaticity diagram that Fig. 6 encapsulation obtains;
Fig. 7 embodiment 5,6,7 fluorescent material exciting light spectrograms;
Fig. 8 embodiment 5,6,7 fluorescent material utilizing emitted light spectrograms;
The white light LEDs spectrogram that Fig. 9 encapsulation obtains;
The white light LEDs chromaticity diagram that Figure 10 encapsulation obtains;
The crystalline structure X diffractogram (XRD) of the fluorescent material of Figure 11 embodiment 8 preparations;
The fluorescent material exciting light spectrogram of Figure 12 embodiment 8 preparations;
The fluorescent material utilizing emitted light spectrogram of Figure 13 embodiment 8 preparations;
The fluorescent material x-ray photoelectron energy spectrogram (XPS) of Figure 14 embodiment 8 preparations;
The white light LEDs spectrogram that Figure 15 encapsulation obtains;
The white light LEDs chromaticity diagram that Figure 16 encapsulation obtains;
The crystalline structure X diffractogram (XRD) of the fluorescent material of Figure 17 embodiment 11 preparations;
The fluorescent material exciting light spectrogram of Figure 18 embodiment 11 preparations;
The fluorescent material utilizing emitted light spectrogram of Figure 19 embodiment 11 preparations;
The fluorescent material x-ray photoelectron energy spectrogram (XPS) of Figure 20 embodiment 11 preparations;
The white light LEDs spectrogram that Figure 21 encapsulation obtains;
The white light LEDs chromaticity diagram that Figure 22 encapsulation obtains.
Embodiment
According to chemical general formula M
X-zY
6-x-y-zAl
11-xL
xO
25.5-0.5kF
k: y.Ce
3+, z.Mn
2+, with analytically pure MgO, MgF
2, NH
4F, Al
2O
3, AlF
3, SiO
2, ZrO
2, BaF
2, MnCO
3And CeO
2, press table 1,2 and 3 chemical constitution ratios batchings is mixed, batch mixing is 40 hours in encloses container, then with mixture at H
2Under %＜5% atmosphere, insulation is 6 hours in 1620 ℃ of reduction furnaces, and 500 eye mesh screens are crossed in cooling, broken classification, obtains granularity and be the alkaline earth fluorine oxygen silico-aluminate fluorescent material about 3～20 μ m.(450～460nm) combination package obtain white light LEDs with blue-light LED chip.
Fluorescent material emission main peak is definite by national fluorescent material testing standard GB/T 14634.2-2010 test, and excitation spectrum is tested by FLS-920 transient state steady-state fluorescence spectrograph.The crystalline structure of fluorescent material (XRD) is determined by GB/T 19421.1-2003 testing standard.The colour temperature of white light LEDs (CCT), colour rendering index (Ra), emmission spectrum, luminous efficiency (lm/w) are determined by GB/T 24982-2010 testing method.Fluorescent material photoelectron spectrum (XPS) is determined by the ISO15472-2001 testing method.
Table 1 fluorescent material chemical constitution
Table 2 fluorescent material chemical constitution
Table 3 fluorescent material chemical constitution
Claims (2)
1. launch the adjustable fluorescent material of main peak variation for one kind, it is characterized in that being alkaline earth fluorine oxygen silico-aluminate fluorescent material, chemical general formula is expressed as: M
X-zY
6-x-y-zAl
11-xL
xO
25-5-0.5kF
k: yCe
3+, zMn
2+, Ce wherein
3+And Mn
2+Be the luminescence center ion, in the general formula: 0≤x≤1.5,0.01≤y≤0.16,0≤z≤0.2,0＜k≤0.01; M is Mg
2+Or Ba
2+, L is Si
4+Or Zr
4+According to chemical general formula, with analytically pure MgO, MgF
2, NH
4F, Al
2O
3, AlF
3, SiO
2, ZrO
2, BaF
2, BaCO
3, MnCO
3And CeO
2, mix in chemical constitution ratio batching, batch mixing is 40 hours in encloses container, then with mixture at H
2Under %＜5% atmosphere, insulation is 6 hours in 1620 ℃ of reduction furnaces, and 500 eye mesh screens are crossed in cooling, broken classification, obtains granularity and be the alkaline earth fluorine oxygen silico-aluminate fluorescent material about 3～20 μ m.
2. emission main peak claimed in claim 1 changes the preparation method of adjustable fluorescent material, it is characterized in that according to chemical general formula, with analytically pure MgO, MgF
2, NH
4F, Al
2O
3, AlF
3, SiO
2, ZrO
2, BaF
2, BaCO
3, MnCO
3And CeO
2, mix in chemical constitution ratio batching, batch mixing is 40 hours in encloses container, then with mixture at H
2Under %＜5% atmosphere, insulation is 6 hours in 1620 ℃ of reduction furnaces, and 500 eye mesh screens are crossed in cooling, broken classification, obtains granularity and be the alkaline earth fluorine oxygen silico-aluminate fluorescent material about 3～20 μ m.
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| US10574951B2 (en) | 2016-01-26 | 2020-02-25 | Barco N.V. | Control of color primaries and white point in a laser-phosphor projector |
| WO2017132944A1 (en) * | 2016-02-04 | 2017-08-10 | Barco Visual (Beijing) Electronics Co., Ltd. | Display system with static green primary color reduction filter |
| US10345606B2 (en) | 2016-02-04 | 2019-07-09 | Barco Visual (Beijing) Electronics Company Limited | Display system with static green primary color reduction filter |
| CN110144214A (en) * | 2019-06-21 | 2019-08-20 | 南京工业大学 | One kind regulating and controlling transient metal Mn by reaction temperature2+Up-conversion luminescence method |
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