CN102978701B - A kind of Er 3+/ Yb 3+codoped lithium yttrium fluoride single crystal and preparation method thereof - Google Patents
A kind of Er 3+/ Yb 3+codoped lithium yttrium fluoride single crystal and preparation method thereof Download PDFInfo
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- CN102978701B CN102978701B CN201210497374.XA CN201210497374A CN102978701B CN 102978701 B CN102978701 B CN 102978701B CN 201210497374 A CN201210497374 A CN 201210497374A CN 102978701 B CN102978701 B CN 102978701B
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Abstract
The invention discloses a kind of Er
3+/ Yb
3+codoped lithium yttrium fluoride single crystal and preparation method thereof, this lithium yttrium fluoride single crystal is a kind of rare earth ion Er
3+/ Yb
3+the single crystal of codoped, its molecular formula is LiY
(1-x-y)er
xyb
yf
4, wherein 0.008≤x≤0.085,0.002≤y≤0.170.Yb in this lithium yttrium fluoride single crystal
3+with Er
3+segregation coefficient all close to 1, high efficiency 2.7 μm of mid-infrared lasers can be exported, in infrared transmitance high, than calorifics, machinery, the chemical stability excellence of vitreous material, there is the features such as phonon energy is low, 300 ~ 5500nm wide broadband radiation perviousness is high, colour center formation volume is few, thermal lensing effect is low, be more prone to processing, be more suitable for the application in Laser Devices; Preparation method of the present invention adopts sealing crucible descent method technology, simple to operate, high-temperature fluorination process is carried out to raw material, and adopts the sealed environment of exhausted water, anoxybiotic, make to completely cut off with air and steam in crystal growing process, obtain the high-quality Er hardly containing-OH ion and oxide compound
3+/ Yb
3+codoped LiYF
4single crystal.
Description
Technical field
The present invention relates to ylf crystal, be specifically related to a kind of Er with enhancing 2.7 μm of middle-infrared band emission characteristics
3+/ Yb
3+codoped lithium yttrium fluoride single crystal and preparation method thereof.
Background technology
In recent years, due to the important application in laser medicine operation, remote sensing, lidar, chemical sensitisation, air pollution control, communication and military affairs etc., in the solid statelaser of infrared 2.7 μm of center wave bands be subject to the great attention of domestic and international research institution.
Rare earth ion doped inorganic materials is one of effective way obtaining near infrared and mid-infrared laser.Most of group of the lanthanides races rare earth ion has abundant level structure.Wherein Er
3+rare earth ion
4i
11/2→
4i
13/2energy level is jumped up the fluorescent emission that can produce 2.7 μm, with Er
3+for 2.7 μm of mid-infrared laser materials of luminescence center have certain research, mainly Er
3+single Li doped YF
4, CaF
2, YAlO
3, SrLaGa
3o
7, BaY
2f
8crystal and Er
3+with the fluoride glass matrix of rare earth sensitized ions codoped.Owing to being applied to the luminescence of middle-infrared band, the fluorochemical that therefore matrix of material is infrared in being mainly is main.
Er
3+energy level on it in ion
4i
11/2fluorescence lifetime than lower energy level
4i
13/2short, therefore Er
3+ion list doped crystal is relatively low in the luminous efficiency of 2.7 mu m wavebands, and luminous intensity is more weak, and this will seriously restrict the application of such material in 2.7 mu m waveband middle infrared lasers.
Although the sensibilized by rare earth ion in bismuth germanate glass achieves Er
3+infrared enhancing illumination effect in 2.7 μm of ion, but for germanate oxide glass material, the glass preparation of high quality chunk sizes, particularly the insoluble own defect in aspect such as glass material mechanical property, thermal property, physical and chemical performance and bad mechanical strength and technological difficulties restrict its development, also become the nonoxide glass optical fiber such as extraordinary fluorochemical and move towards practical biggest obstacle.
The development of current semiconductor laser diode (LD) is quite ripe, particularly wavelength is that the LD light source of 980nm has functional, that price is suitable ready-made commercial product, therefore develops available 980nm and has great application prospect as 2.7 μm of middle infrared lasers of pumping source.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of and has strong absorption to 980nmLD, can transfer energy to Er
3+center light emitting ionic, and the Er strengthening transmitting for 2.7 mu m wavebands with excellent mechanical property, thermal property, physical and chemical performance and optical transmittance that can increase substantially infraluminescence intensity in 2.7 μm
3+/ Yb
3+codoped lithium yttrium fluoride single crystal and preparation method thereof.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of Er
3+/ Yb
3+codoped lithium yttrium fluoride single crystal, this lithium yttrium fluoride single crystal is a kind of rare earth ion Er
3+/ Yb
3+the single crystal of codoped, its molecular formula is LiY
(1-x-y)er
xyb
yf
4, wherein 0.008≤x≤0.085,0.002≤y≤0.170.
A kind of Er strengthening transmitting for 2.7 mu m wavebands
3+/ Yb
3+the preparation method of codoped lithium yttrium fluoride single crystal, comprises the following steps:
1) by 51.5mol%LiF, 23.0 ~ 47.5mol%YF
3, 0.8 ~ 8.5mol%ErF
3, 0.2 ~ 17mol%YbF
3mole percent specific concentration component composition, take LiF, YF of corresponding weight respectively
3, ErF
3and YbF
3, mixing is placed in device for grinding, and mixing 5 ~ 6 hours of milling, obtains uniform powder;
2) be put in fluffy for above-mentioned powder in boat-shaped Platinum crucible, then this boat-shaped Platinum crucible is installed in the platinum pipeline of tube type resistance furnace; Then high-purity N is used
2the ducted air of this platinum of air scavenge, and this platinum pipeline is hunted leak; Afterwards the furnace body temperature of tube type resistance furnace is elevated to 750 ~ 815 DEG C gradually, logical HF gas, reacts 1 ~ 5 hour, removes the H that may contain
2o and oxyfluoride, absorb the HF gas in tail gas by NaOH solution in reaction process, after reaction terminates, stops logical HF gas, close tube type resistance furnace, finally use high-purity N
2hF gas residual in air scavenge platinum pipeline, obtains being mixed with Er
3+and Yb
3+polycrystalline powder;
3) above-mentioned polycrystalline powder is placed in device for grinding and is milled into powder, then this powder is placed in platinum crucible and compacting, then seal this platinum crucible;
4) platinum crucible of sealing is placed in Si-Mo rod stove, use Bridgman-Stockbarge method for growing crystal, the parameter of growing crystal is: furnace body temperature is 920 ~ 980 DEG C, and inoculation temp is 820 ~ 850 DEG C, the thermograde of solid-liquid interface is 20 ~ 90 DEG C/cm, and crucible lowering speed is 0.2 ~ 2mm/h; After crystal growth terminates, with 20 ~ 80 DEG C/h decline furnace temperature to room temperature, obtaining molecular formula is LiY
(1-x-y)er
xyb
yf
4er
3+/ Yb
3+the lithium yttrium fluoride single crystal of codoped, wherein 0.008≤x≤0.085,0.002≤y≤0.170.
Preferably, LiF, YF described in step 1)
3, ErF
3and YbF
3purity be all greater than 99.99%.
Compared with prior art, the invention has the advantages that:
And Er (1)
3+single doped crystal is compared, and the present invention is at lithium yttrium fluoride (LiYF
4) mix Er in single crystal
3+and Yb
3+ion, under the exciting of 980nmLD laser, Yb
3+dopant ion has strong sorption to 980nmLD, can effectively Yb
3+energy trasfer on ion is to Er
3+on ion, increase Er
3+in ion
4i
11/2population on energy level, thus improve Er
3+the luminous efficiency that ion is infrared in 2.7 μm.Er of the present invention
3+/ Yb
3+the lithium yttrium fluoride single crystal of codoped has the features such as phonon energy is low, 300 ~ 5500nm wide broadband radiation perviousness is high, colour center formation volume is few, thermal lensing effect is low.Trivalent rare earth ions replaces Y
3+the case of ion is without the need to charge compensation, and comparable ionic radius size, can realize the rare earth ion doped of larger concentration.The Er that the present invention obtains
3+/ Yb
3+the lithium yttrium fluoride single crystal of codoped has the fluorescent emission efficiency of 2.7 μm that significantly strengthen, Er in crystal
3+with Yb
3+effciency of energy transfer reach more than 90%.
(2) because rare earth ion exists Segregation in crystal, the rear earth ions distribution therefore in crystal is very uneven.But in single crystal of the present invention, Yb
3+with Er
3+segregation coefficient all close to 1, therefore can obtain relatively uniform Er
3+/ Yb
3+the single crystal of codoped, the material of preparation is suitable for applying in Laser Devices, and exports high efficiency 2.7 μm of mid-infrared lasers.
And Er (3)
3+/ Yb
3+the vitreous material of codoped is compared, Er
3+/ Yb
3+the rigidity Cycle-symmetry structure of the lithium yttrium fluoride single crystal of codoped is conducive to the output obtaining high luminous efficiency and realize laser, there is calorifics, machinery, the chemical stability than vitreous material excellence, be more prone to processing, be more suitable for the application in Laser Devices.
(4) the present invention adopts crucible descent method to prepare single crystal, compared with crystal pulling method technology, crucible descent method have simple to operate, without the need to passing into CF in process of growth
4gas eliminates the advantage of the oxygen source in burner hearth, and many crystal can realize in a secondary growth, is therefore conducive to mass-producing and industrialization is produced.The inventive method carries out high-temperature fluorination process to raw material, and adopts the sealed environment of exhausted water, anoxybiotic, makes to completely cut off with air and steam in crystal growing process, obtains the high-quality Er hardly containing-OH ion and oxide compound
3+/ Yb
3+li doped YF
4single crystal, in infrared transmitance high.
Embodiment
Below in conjunction with embodiment and reference examples, the present invention is described in further detail.
Embodiment A 1, A2, A3, A4, A5 and reference examples A0:
Identical preparation method is adopted to prepare the monocrystal material of embodiment A 1 ~ A5 and reference examples A0 respectively, that is: carry out proportioning by the component composition of the Mole percent specific concentration of table 1, weigh, raw materials used purity is all greater than 99.99%, mixing is placed in device for grinding, to mill mixing 5 hours, obtain uniform powder; Be put in fluffy for above-mentioned powder in boat-shaped Platinum crucible, then this boat-shaped Platinum crucible is installed in the platinum pipeline of tube type resistance furnace; Then high-purity N is used
2the ducted air of this platinum of air scavenge, and this platinum pipeline is hunted leak; Afterwards the furnace body temperature of tube type resistance furnace is elevated to 800 DEG C gradually, logical HF gas, reacts 2 hours, removes the H that may contain
2o and oxyfluoride, absorb the HF gas in tail gas by NaOH solution in reaction process, after reaction terminates, stops logical HF gas, close tube type resistance furnace, finally use high-purity N
2hF gas residual in air scavenge platinum pipeline, obtains rare earth ion doped polycrystalline powder; Above-mentioned polycrystalline powder is placed in device for grinding and is milled into powder, then this powder is placed in platinum crucible and compacting, then seal this platinum crucible; The platinum crucible of sealing is placed in Si-Mo rod stove, uses Bridgman-Stockbarge method for growing crystal, the parameter of growing crystal is: furnace body temperature is 940 DEG C, and inoculation temp is 840 DEG C, and the thermograde of solid-liquid interface is 60 DEG C/cm, and crucible lowering speed is 1mm/h; After crystal growth terminates, with 60 DEG C/h decline furnace temperature to room temperature, obtaining molecular formula is LiY
(1-x-y)er
xyb
yf
4rare earth ion doped single crystal.
Consider doping with rare-earth ions Er
3+fractional condensation situation in crystal, the crystal of the embodiment A 1 ~ A5 obtained and reference examples A0 is carried out to the cutting sampling of same general position, by x value and the y value of inductively coupled plasma atomic emission spectrum (ICP) method analyzing and testing each sample, after testing, the x=0.0205 of reference examples A0 sample, y=0; The x=0.0205 of embodiment A 1 sample, y=0.0051; The x=0.0206 of embodiment A 2 sample, y=0.0102; The x=0.0209 of embodiment A 3 sample, y=0.0154; The x=0.0206 of embodiment A 4 sample, y=0.0305; The x=0.0207 of embodiment A 5 sample, y=0.0506.
Again each sample of acquisition is polished to the thin slice that thickness is 2 millimeters, carries out fluorometric investigation, its fluorescence intensity is in table 1.
The ratio (Ai/A0) of table 1, rear-earth-doped concentration and 2.7 μm of fluorescence intensities thereof
Embodiment B 1, B2, B3, B4, B5 and reference examples B0:
Identical preparation method is adopted to prepare the monocrystal material of Embodiment B 1 ~ B5 and reference examples B0 respectively, that is: carry out proportioning by the component composition of the Mole percent specific concentration of table 2, weigh, raw materials used purity is all greater than 99.99%, mixing is placed in device for grinding, to mill mixing 5 hours, obtain uniform powder; Be put in fluffy for above-mentioned powder in boat-shaped Platinum crucible, then this boat-shaped Platinum crucible is installed in the platinum pipeline of tube type resistance furnace; Then high-purity N is used
2the ducted air of this platinum of air scavenge, and this platinum pipeline is hunted leak; Afterwards the furnace body temperature of tube type resistance furnace is elevated to 800 DEG C gradually, logical HF gas, reacts 3 hours, removes the H that may contain
2o and oxyfluoride, absorb the HF gas in tail gas by NaOH solution in reaction process, after reaction terminates, stops logical HF gas, close tube type resistance furnace, finally use high-purity N
2hF gas residual in air scavenge platinum pipeline, obtains rare earth ion doped polycrystalline powder; Above-mentioned polycrystalline powder is placed in device for grinding and is milled into powder, then this powder is placed in platinum crucible and compacting, then seal this platinum crucible; The platinum crucible of sealing is placed in Si-Mo rod stove, uses Bridgman-Stockbarge method for growing crystal, the parameter of growing crystal is: furnace body temperature is 940 DEG C, and inoculation temp is 840 DEG C, and the thermograde of solid-liquid interface is 70 DEG C/cm, and crucible lowering speed is 0.8mm/h; After crystal growth terminates, with 50 DEG C/h decline furnace temperature to room temperature, obtaining molecular formula is LiY
(1-x-y)er
xyb
yf
4rare earth ion doped single crystal.
Consider doping with rare-earth ions Er
3+fractional condensation situation in crystal, the crystal of the Embodiment B 1 ~ B5 obtained and reference examples B0 is carried out to the cutting sampling of same general position, by x value and the y value of inductively coupled plasma atomic emission spectrum (ICP) method analyzing and testing each sample, after testing, the x=0.0103 of reference examples B0 sample, y=0; The x=0.0104 of Embodiment B 1 sample, y=0.0026; The x=0.0103 of Embodiment B 2 sample, y=0.0052; The x=0.0104 of Embodiment B 3 sample, y=0.0103; The x=0.0105 of Embodiment B 4 sample, y=0.0155; The x=0.0104 of Embodiment B 5 sample, y=0.0206.
Again each sample of acquisition is polished to the thin slice that thickness is 2 millimeters, carries out fluorometric investigation.Its fluorescence intensity is in table 2.
The ratio (Bi/B0) of table 2, rear-earth-doped concentration and 2.7 μm of fluorescence intensities thereof
Embodiment C 1, C2, C3, C4 and reference examples C0:
Identical preparation method is adopted to prepare the monocrystal material of Embodiment C 1 ~ C4 and reference examples C0 respectively, that is: carry out proportioning by the component composition of the Mole percent specific concentration of table 3, weigh, raw materials used purity is all greater than 99.99%, mixing is placed in device for grinding, to mill mixing 5 hours, obtain uniform powder; Be put in fluffy for above-mentioned powder in boat-shaped Platinum crucible, then this boat-shaped Platinum crucible is installed in the platinum pipeline of tube type resistance furnace; Then high-purity N is used
2the ducted air of this platinum of air scavenge, and this platinum pipeline is hunted leak; Afterwards the furnace body temperature of tube type resistance furnace is elevated to 800 DEG C gradually, logical HF gas, reacts 4 hours, removes the H that may contain
2o and oxyfluoride, absorb the HF gas in tail gas by NaOH solution in reaction process, after reaction terminates, stops logical HF gas, close tube type resistance furnace, finally use high-purity N
2hF gas residual in air scavenge platinum pipeline, obtains rare earth ion doped polycrystalline powder; Above-mentioned polycrystalline powder is placed in device for grinding and is milled into powder, then this powder is placed in platinum crucible and compacting, then seal this platinum crucible; The platinum crucible of sealing is placed in Si-Mo rod stove, uses Bridgman-Stockbarge method for growing crystal, the parameter of growing crystal is: furnace body temperature is 940 DEG C, and inoculation temp is 840 DEG C, and the thermograde of solid-liquid interface is 80 DEG C/cm, and crucible lowering speed is 0.9mm/h; After crystal growth terminates, with 60 DEG C/h decline furnace temperature to room temperature, obtaining molecular formula is LiY
(1-x-y)er
xyb
yf
4rare earth ion doped single crystal.
Consider doping with rare-earth ions Er
3+fractional condensation situation in crystal, the crystal of the Embodiment C 1 ~ C4 obtained and reference examples C0 is carried out to the cutting sampling of same general position, by x value and the y value of inductively coupled plasma atomic emission spectrum (ICP) method analyzing and testing each sample, after testing, the x=0.0407 of reference examples C0 sample, y=0; The x=0.0406 of Embodiment C 1 sample, y=0.00207; The x=0.0405 of Embodiment C 2 sample, y=0.0406; The x=0.0406 of Embodiment C 3 sample, y=0.0609; The x=0.0408 of Embodiment C 4 sample, y=0.0813.
Again each sample of acquisition is polished to the thin slice that thickness is 2 millimeters, carries out fluorometric investigation.Its fluorescence intensity is in table 3.
The ratio (Ci/C0) of table 3, rear-earth-doped concentration and 2.7 μm of fluorescence intensities thereof
Embodiment D1, D2, D3, D4 and reference examples D0:
Identical preparation method is adopted to prepare the monocrystal material of embodiment D1 ~ D4 and reference examples D0 respectively, that is: carry out proportioning by the component composition of the Mole percent specific concentration of table 3, weigh, raw materials used purity is all greater than 99.99%, mixing is placed in device for grinding, to mill mixing 5 hours, obtain uniform powder; Be put in fluffy for above-mentioned powder in boat-shaped Platinum crucible, then this boat-shaped Platinum crucible is installed in the platinum pipeline of tube type resistance furnace; Then high-purity N is used
2the ducted air of this platinum of air scavenge, and this platinum pipeline is hunted leak; Afterwards the furnace body temperature of tube type resistance furnace is elevated to 800 DEG C gradually, logical HF gas, reacts 2.5 hours, removes the H that may contain
2o and oxyfluoride, absorb the HF gas in tail gas by NaOH solution in reaction process, after reaction terminates, stops logical HF gas, close tube type resistance furnace, finally use high-purity N
2hF gas residual in air scavenge platinum pipeline, obtains rare earth ion doped polycrystalline powder; Above-mentioned polycrystalline powder is placed in device for grinding and is milled into powder, then this powder is placed in platinum crucible and compacting, then seal this platinum crucible; The platinum crucible of sealing is placed in Si-Mo rod stove, uses Bridgman-Stockbarge method for growing crystal, the parameter of growing crystal is: furnace body temperature is 940 DEG C, and inoculation temp is 840 DEG C, and the thermograde of solid-liquid interface is 50 DEG C/cm, and crucible lowering speed is 0.5mm/h; After crystal growth terminates, with 80 DEG C/h decline furnace temperature to room temperature, obtaining molecular formula is LiY
(1-x-y)er
xyb
yf
4rare earth ion doped single crystal.
Consider doping with rare-earth ions Er
3+fractional condensation situation in crystal, the crystal of the embodiment D1 ~ D4 obtained and reference examples D0 is carried out to the cutting sampling of same general position, by x value and the y value of inductively coupled plasma atomic emission spectrum (ICP) method analyzing and testing each sample, after testing, the x=0.0507 of reference examples D0 sample, y=0; The x=0.0506 of embodiment D1 sample, y=0.0207; The x=0.0505 of embodiment D2 sample, y=0.0506; The x=0.0506 of embodiment D3 sample, y=0.0759; The x=0.0508 of embodiment D4 sample, y=0.01013.
Again each sample of acquisition is polished to the thin slice that thickness is 2 millimeters, carries out fluorometric investigation.Its fluorescence intensity is in table 4.
The ratio (Di/D0) of table 4, rear-earth-doped concentration and 2.7 μm of fluorescence intensities thereof
Simultaneously under identical conditions, measure and compare the intensity size often organizing the strongest luminescent sample in series embodiment, i.e. A4, B3, C3 and D3 sample, in upper four embodiment samples, what 2.7 mu m waveband fluorescence intensities were the strongest is Embodiment C 3 sample, its molecular formula LiY
(1-x-y)er
xyb
yf
4in, x=0.0406, y=0.0609, i.e. Er
3+doping content be 4.10mol%, Yb
3+doping content be 0.030mol%.
Claims (3)
1. an Er
3+/ Yb
3+codoped lithium yttrium fluoride single crystal, is characterized in that this lithium yttrium fluoride single crystal is a kind of rare earth ion Er
3+/ Yb
3+the single crystal of codoped, its molecular formula is LiY
(1-x-y)er
xyb
yf
4, wherein 0.008≤x≤0.085,0.002≤y≤0.170.
2. the Er strengthening to launch for 2.7 mu m wavebands
3+/ Yb
3+the preparation method of codoped lithium yttrium fluoride single crystal, is characterized in that comprising the following steps:
1) by 51.5mol% LiF, 23.0 ~ 47.5mol% YF
3, 0.8 ~ 8.5mol% ErF
3, 0.2 ~ 17mol% YbF
3mole percent specific concentration component composition, take LiF, YF of corresponding weight respectively
3, ErF
3and YbF
3, mixing is placed in device for grinding, and mixing 5 ~ 6 hours of milling, obtains uniform powder;
2) be put in fluffy for above-mentioned powder in boat-shaped platinum crucible, then this boat-shaped platinum crucible is installed in the platinum pipeline of tube type resistance furnace; Then high-purity N is used
2the ducted air of this platinum of air scavenge, and this platinum pipeline is hunted leak; Afterwards the furnace body temperature of tube type resistance furnace is elevated to 750 ~ 815 DEG C gradually, logical HF gas, reacts 1 ~ 5 hour, removes the H that may contain
2o and oxyfluoride, absorb the HF gas in tail gas by NaOH solution in reaction process, after reaction terminates, stops logical HF gas, close tube type resistance furnace, finally use high-purity N
2hF gas residual in air scavenge platinum pipeline, obtains being mixed with Er
3+and Yb
3+polycrystalline powder;
3) above-mentioned polycrystalline powder is placed in device for grinding and is milled into powder, then this powder is placed in platinum crucible and compacting, then seal this platinum crucible;
4) platinum crucible of sealing is placed in Si-Mo rod stove, use Bridgman-Stockbarge method for growing crystal, the parameter of growing crystal is: furnace body temperature is 920 ~ 980 DEG C, and inoculation temp is 820 ~ 850 DEG C, the thermograde of solid-liquid interface is 20 ~ 90 DEG C/cm, and dropping speed of the crucible is 0.2 ~ 2mm/h; After crystal growth terminates, with 20 ~ 80 DEG C/h decline furnace temperature to room temperature, obtaining molecular formula is LiY
(1-x-y)er
xyb
yf
4er
3+/ Yb
3+the lithium yttrium fluoride single crystal of codoped, wherein 0.008≤x≤0.085,0.002≤y≤0.170.
3. preparation method according to claim 2, is characterized in that LiF, the YF described in step 1)
3, ErF
3and YbF
3purity be all greater than 99.99%.
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| X.P.Chen et al..Comparative investigation on structure and luminescence properties of fl * |
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