WO2015125771A1 - アップコンバージョン蛍光体 - Google Patents
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- WO2015125771A1 WO2015125771A1 PCT/JP2015/054260 JP2015054260W WO2015125771A1 WO 2015125771 A1 WO2015125771 A1 WO 2015125771A1 JP 2015054260 W JP2015054260 W JP 2015054260W WO 2015125771 A1 WO2015125771 A1 WO 2015125771A1
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
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- the present invention relates to an up-conversion phosphor that can emit light having higher energy than excitation light.
- the up-conversion phosphor can emit light having higher energy than the excitation light.
- Up-conversion phosphors are expected to be applied in various fields because light sources with low energy can be used. However, phosphors emit light with lower energy than excitation light (down-conversion).
- down-conversion Usually, in order to cause the up-conversion phenomenon, it is necessary to participate in excited state absorption, multiphoton absorption, energy transfer, and the like. For this reason, various materials have been studied, and various studies and proposals have been made to increase luminous efficiency. *
- a composition formula of (R 1-x , Er x ) 2 O 3 (R is at least one of Y, La, Gd and Lu.
- X is a molar amount of 0.001 ⁇ x ⁇ 0.20).
- Fluorescent fine particles (see Patent Document 1) that emit up-conversion by light having a wavelength in the range of 500 nm to 2000 nm, and visible up-conversion emission from Y 2 O 3 : Eu 3+ , Yb 3+ There is a report (see Non-Patent Document 1). There is also a report on the up-conversion characteristics of Er 3+ -Yb 3+ : NaYF 4 including Yb 3+ having a wide concentration range (see Non-Patent Document 2).
- Patent Document 2 Technology for producing up-conversion nanoparticles by irradiating a target in liquid (made of a fluorescent material having up-conversion characteristics) with laser light (see Patent Document 2), colloidal BaYF 5 nanocrystals: Tm 3+ , Yb There is also a report on blue upconversion from near infrared in 3+ (Non-Patent Document 5).
- an object of the present invention is to provide a novel up-conversion phosphor that can express various emission colors and has excellent emission characteristics.
- the present inventors have made extensive studies to solve the above-mentioned problems.
- the base material is a ZnMoO 4 system
- the present inventors consist of Yb 3+ , Tm 3+ , Er 3+ and Ho 3+.
- at least one rare earth metal ion selected from the group and at least one monovalent metal ion selected from the group consisting of Li + , K + , Na + and Rb + are contained, 3+ ), green (Er 3+ ), red (Ho 3+ ), white (when used in combination with Tm 3+ and Ho 3+ ), etc.
- the present inventors have found that the light emission intensity can be obtained and have completed the present invention.
- the upconversion phosphor according to the present invention includes a ZnMoO 4 base material, Yb 3+ , at least one rare earth metal ion selected from the group consisting of Tm 3+ , Er 3+, and Ho 3+. And at least one monovalent metal ion selected from the group consisting of Li + , K + , Na + and Rb + .
- the up-conversion phosphor of the present invention can obtain up-conversion light emission of various colors such as blue, green, red, and white by appropriately changing the type of rare earth metal while being the same base material. In addition, the emission intensity is high.
- FIG. 6 is a graph showing emission spectra in a wavelength region of 450 to 510 nm for each sample of Examples 1 to 7.
- 6 is a graph showing emission spectra in the wavelength region of 750 to 850 nm for the samples of Examples 1 to 7.
- 6 is a graph showing emission spectra in the wavelength region of 450 to 510 nm for the samples of Examples 1, 8 to 12, and Comparative Example 1.
- 6 is a graph showing emission spectra in the wavelength region of 750 to 850 nm for the samples of Examples 1, 8 to 12 and Comparative Example 1.
- 5 is a graph showing emission spectra in the wavelength region of 450 to 510 nm for each sample of Examples 1, 13 to 15, and Comparative Example 2.
- 6 is a graph showing emission spectra in the wavelength region of 750 to 850 nm for the samples of Examples 1, 13 to 15, and Comparative Example 2.
- 6 is a graph showing emission spectra in the wavelength region of 450 to 510 nm for each sample of Examples 1, 16 to 20 and Comparative Example 2.
- 6 is a graph showing emission spectra in the wavelength region of 750 to 850 nm for the samples of Examples 1, 16 to 20 and Comparative Example 2.
- 6 is a graph showing emission spectra of samples of Examples 21 to 26 and Comparative Example 3.
- 6 is a graph showing emission spectra of samples of Examples 21 and 27 to 31 and Comparative Example 4; 6 is a graph showing emission spectra of samples of Examples 21, 32 to 34 and Comparative Example 5.
- 10 is a graph showing emission spectra of samples of Examples 21, 35 to 38 and Comparative Example 5.
- 4 is a graph showing an emission spectrum of each sample of Examples 39 to 46.
- 10 is a graph showing emission spectra of samples of Examples 41, 47 to 51, and Comparative Example 6.
- 6 is a graph showing emission spectra of samples of Examples 41, 52 to 54, and Comparative Example 7.
- 10 is a graph showing emission spectra of samples of Examples 41, 55 to 58, and Comparative Example 7.
- 6 is a graph showing an emission spectrum of each sample of Examples 59 to 62.
- 6 is a graph showing an emission spectrum of each sample of Examples 63 to 65. 6 is a graph showing an emission spectrum of each sample of Examples 66 to 68. 7 is a graph showing an emission spectrum of each sample of Examples 69 to 74. 10 is a graph showing an emission spectrum in a wavelength region of 450 to 510 nm for each sample of Examples 1 and 75 to 79. 6 is a graph showing an emission spectrum in a wavelength region of 620 to 680 nm for each sample of Examples 1 and 75 to 79. 6 is a graph showing an emission spectrum in a wavelength region of 750 to 850 nm for each sample of Examples 1 and 75 to 79.
- the base material of the upconversion phosphor of the present invention is a ZnMoO 4 base material.
- the upconversion phosphor of the present invention is constituted by containing the following specific ions in the base material. In the upconversion phosphor of the present invention, the following specific ions are presumed to be substituted for Zn 2+ in the host material.
- the up-conversion phosphor of the present invention contains Yb 3+ .
- Yb 3+ content ratio (hereinafter simply referred to as “Yb 3+ content ratio” when the total of the divalent metal ion, Yb 3+ , the rare earth metal ion and the monovalent metal ion in the base material is 100 at%. Is preferably 20 at% or less, and more preferably in the range of 5 to 15 at%.
- the “divalent metal ion in the base material” in the above is Zn 2+ when the base material is ZnMoO 4 , and a part of Zn in ZnMoO 4 is another equivalent element (such as Ca).
- Yb 3+ content ratio is preferably 20 at% or less. However, since Yb 3+ is an essential component, it is needless to say that it does not include the case of 0 at%. The same applies to the description of other essential components.
- the upconversion phosphor of the present invention contains at least one rare earth metal ion selected from the group consisting of Tm 3+ , Er 3+ and Ho 3+ .
- the up-conversion phosphor exhibits blue light emission.
- the content ratio of Tm 3+ when the total of the divalent metal ions, Yb 3+ , the rare earth metal ions and the monovalent metal ions in the base material is 100 at% (hereinafter simply referred to as the “Tm 3+ content ratio”). Is preferably 2 at% or less, more preferably in the range of 0.05 to 1 at%, and particularly preferably in the range of 0.05 to 0.5 at%.
- Er 3+ content ratio when the total of the divalent metal ions, Yb 3+ , rare earth metal ions and monovalent metal ions in the base material is 100 at%. Is preferably 5 at% or less, more preferably in the range of 0.1 to 2 at%, and particularly preferably in the range of 0.2 to 0.6 at%.
- the up-conversion phosphor exhibits red light emission.
- Divalent metal ions in the matrix material, Yb 3+ The content ratio of Ho 3+ when the total of the rare earth metal ions and the monovalent metal ions is 100 at% (hereinafter sometimes simply referred to as “Ho 3+ content ratio”) is 5 at% or less. Is preferably 2 at% or less, and particularly preferably in the range of 0.03 to 1 at%.
- a plurality of the rare earth metal ions may be combined and contained in the base material. By combining a plurality of these in this way, it becomes possible to obtain up-conversion light emission of a color that cannot be obtained when Tm 3+ , Er 3+ or Ho 3+ is applied alone. In this case, a desired luminescent color can be obtained by appropriately selecting the mutual ratio when combining a plurality of rare earth metal ions. In order to obtain white light emission, it is advantageous to combine Tm 3+ and Ho 3+ as rare earth metal ions.
- the up-conversion phosphor of the present invention contains at least one monovalent metal ion selected from the group consisting of Li + , K + , Na + and Rb + .
- the emission characteristics are excellent, and it is particularly preferable to use K + .
- the content ratio of the monovalent metal ion when the total of the divalent metal ion, Yb 3+ , the rare earth metal ion and the monovalent metal ion in the base material is 100 at% (hereinafter simply referred to as “monovalent metal ion”).
- the content ratio "and may be referred to as” Li + the content ratio ” is preferably at most 20at%, and more preferably in the range of 5 ⁇ 15 at%.
- the up-conversion phosphor of the present invention is a known solid-phase method or liquid-phase method (for example, a sol-gel method) using a mixture of the above-described compounds containing each component. ). Although not particularly limited, for example, it is preferable to manufacture as follows. *
- each compound (for example, oxide, carbonate, etc.) containing each element constituting the up-conversion phosphor is mixed.
- the mixture may include a flux.
- the flux include Li 2 CO 3 , H 3 BO 3 , NH 4 F, CaF 2 , MgF 2 , B 2 O 3 , (NH 4 ) 2 CO 3, etc.
- Li 2 CO 3 , H 3 BO 3 and NH 4 F are preferred.
- the mixing method may be either dry mixing or wet mixing, and is not particularly limited, but preferred is wet mixing performed by adding ethanol or water. In the case of wet mixing, drying is performed as appropriate after mixing. *
- the mixing ratio of each component may be appropriately determined in consideration of the content ratio of each component in the up-conversion phosphor.
- it is preferably in the range of 0.005 to 0.4 mol.
- the mixture obtained as described above is fired.
- Calcination is preferably performed in an air atmosphere at a temperature range of 500 to 800 ° C., and more preferably at a temperature range of 550 to 700 ° C. Further, the firing time is preferably 3 to 5 hours.
- the powder may be pulverized to form a powder.
- the powder is, for example, about several nm to several tens of nm.
- Example 1 Each powder of ZnCO 3 ; 0.433 g, MoO 3 ; 0.9596 g, TmCl 3 .6H 2 O; 0.0026 g, Yb 2 O 3 ; 0.134 g, K 2 CO 3 ; 0.046 g And wet mixed using a pestle and ethanol in a mortar. After the mixing, the mixture was dried at 130 ° C. for 4 hours and pulverized with a pestle to obtain a mixed powder. Next, the mixed powder obtained above was biaxially extruded to obtain pellets ( ⁇ 13 ⁇ 3 mm), and fired at 650 ° C. for 4 hours in an air atmosphere (heating rate 5 ° C./min).
- the fired pellets were finely pulverized with a vibration mill.
- the sample according to Example 1 is represented by ZnMoO 4 : Yb 3+ , Tm 3+ , K + , the Yb 3+ content ratio is 10 at%, and the Tm 3+ content ratio is 0.1 at%. , K + content ratio of 10 at% was obtained.
- Example 2 to 7 Each sample according to Examples 2 to 7 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder as a raw material was changed as shown in Table 1 below. Each powder represented by Tm 3+ , K + , and each content ratio of Yb 3+ , Tm 3+, and K + was as shown in Table 1 below was obtained.
- Example 8 to 12 Each sample according to Examples 8 to 12 was made of ZnMoO 4 as in Example 1 except that each powder as a raw material was changed as shown in Table 2 below. Yb 3+, Tm 3+, expressed in K +, Yb 3+, Tm 3+ and the content of K + to obtain a respective powder are shown in the table below 2. Similarly, as a sample according to Comparative Example 1, a powder represented by ZnMoO 4 : Tm 3+ , K + and containing each of Tm 3+ and K + was obtained as shown in Table 2 below.
- Example 13 to 15 Each sample according to Examples 13 to 15 was made of ZnMoO 4 in the same manner as in Example 1 except that each powder as a raw material was changed as shown in Table 3 below.
- Yb 3+, Tm 3+ is represented by M +, Yb 3+, Tm 3+ and the content ratio of M + to obtain a respective powder are shown in the table below 3.
- M + represents any of K + , Na + , Li + and Rb + .
- a powder represented by ZnMoO 4 Yb 3+ , Tm 3+ and containing each of Yb 3+ and Tm 3+ in the following Table 3 was obtained.
- Example 16 to 20 Each sample according to Examples 16 to 20 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder as a raw material was changed as shown in Table 4 below. Each powder represented by Tm 3+ , K + and containing Yb 3+ , Tm 3+ and K + as shown in Table 4 below was obtained.
- Example 21 to 26, Comparative Example 3 As each sample according to Examples 21 to 26, ZnMoO 4 : as in Example 1 except that each powder as a raw material was changed as shown in Table 5 below. Yb 3+, Er 3+, expressed in K +, Yb 3+, Er 3+ and the content of K + to obtain a respective powder are shown in the table below 5. Similarly, as a sample according to Comparative Example 3, a powder represented by ZnMoO 4 : Yb 3+ , K + and containing each of Yb 3+ and K + as shown in Table 5 below was obtained.
- Example 27 to 31, Comparative Example 4 Each sample according to Examples 27 to 31 was made of ZnMoO 4 as in Example 1 except that each powder as a raw material was changed as shown in Table 6 below. Yb 3+, Er 3+, expressed in K +, Yb 3+, Er 3+ and the content of K + to obtain a respective powder are shown in the table below 6. Similarly, as a sample according to Comparative Example 4, a powder represented by ZnMoO 4 : Er 3+ , K + and containing each of Er 3+ and K + in the following Table 6 was obtained.
- Examples 32 to 34, Comparative Example 5 As each sample according to Examples 32 to 34, ZnMoO 4 : as in Example 1 except that each powder as a raw material was changed as shown in Table 7 below. Yb 3+, Er 3+, it is represented by M +, Yb 3+, Er 3+ and the content ratio of M + to obtain a respective powder are shown in the table below 7. M + represents any of K + , Na + , Li + and Rb + . Similarly, as a sample according to Comparative Example 5, a powder represented by ZnMoO 4 : Yb 3+ , Er 3+ and containing each of Yb 3+ and Er 3+ as shown in Table 7 below was obtained.
- Example 35 to 38 Each sample according to Examples 35 to 38 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder used as a raw material was changed as shown in Table 8 below. Each powder represented by Er 3+ , K + , and each content ratio of Yb 3+ , Er 3+, and K + was as shown in Table 8 below was obtained.
- Example 39 to 46 Each sample according to Examples 39 to 46 was made of ZnMoO in the same manner as in Example 1 except that each powder as a raw material was changed as shown in Table 9 below. 4: Yb 3+, Ho 3+, expressed in K +, Yb 3+, each content of Ho 3+ and K + to obtain a respective powder are shown in the table below 9.
- Example 47 to 51 Comparative Example 6
- Each sample according to Examples 47 to 51 was made of ZnMoO 4 as in Example 1 except that each powder as a raw material was changed as shown in Table 10 below.
- Yb 3+, Ho 3+, expressed in K +, Yb 3+, each content of Ho 3+ and K + to obtain a respective powder are shown in the table below 10.
- a powder represented by ZnMoO 4 Ho 3+ , K + and containing each of Ho 3+ and K + in the following Table 10 was obtained.
- Example 52 to 54 Comparative Example 7
- ZnMoO 4 ZnMoO 4 as in Example 1 except that each powder as a raw material was changed as shown in Table 11 below.
- Yb 3+, Ho 3+ is represented by M +, Yb 3+, Ho 3+ and the content ratio of M + to obtain a respective powder are shown in the table below 11.
- M + represents any of K + , Na + , Li + and Rb + .
- a powder represented by ZnMoO 4 Yb 3+ , Ho 3+ and containing each of Yb 3+ and Ho 3+ as shown in Table 11 below was obtained.
- Example 55 to 58 Each sample according to Examples 55 to 58 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder as a raw material was changed as shown in Table 12 below. Each powder represented by Ho 3+ , K + , and each content ratio of Yb 3+ , Ho 3+, and K + was as shown in Table 12 below was obtained.
- Example 59 to 62 Each sample according to Examples 59 to 62 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder as a raw material was changed as shown in Table 13 below. Each powder represented by Tm 3+ , Ho 3+ , K + , and each content ratio of Yb 3+ , Tm 3+ , Ho 3+, and K + was as shown in Table 13 below was obtained.
- Example 63 to 65 Each sample according to Examples 63 to 65 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder as a raw material was changed as shown in Table 14 below. Each powder represented by Tm 3+ , Er 3+ , K + , and each content ratio of Yb 3+ , Tm 3+ , Er 3+ and K + was as shown in Table 14 below was obtained.
- Example 66 to 68 Each sample according to Examples 66 to 68 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1, except that each powder as a raw material was changed as shown in Table 15 below. Each powder represented by Er 3+ , Ho 3+ , K + , and each content ratio of Yb 3+ , Er 3+ , Ho 3+ and K + was as shown in Table 15 below was obtained.
- Example 69 to 74 Each sample according to Examples 69 to 74 was made of ZnMoO 4 : Yb 3+ , in the same manner as in Example 1 except that each powder used as a raw material was changed as shown in Table 16 below. Tm 3+, Er 3+, Ho 3+ , expressed in K +, each powder Yb 3+, Tm 3+, Er 3+ , is Ho 3+ and K + each content of are shown in the table below 16 Got.
- Example 75 to 79 Samples according to Examples 75 to 79 were obtained in the same manner as Example 1 except that the firing temperature of the pellets was changed to 550 ° C, 600 ° C, 700 ° C, 750 ° C, or 800 ° C.
- ZnMoO 4 Yb 3+ , Tm 3+ , K + , each powder having a Yb 3+ content ratio of 10 at%, a Tm 3+ content ratio of 0.1 at%, and a K + content ratio of 10 at% is obtained. It was.
- the samples of Examples 59 to 74 to which two or more of Tm 3+ , Er 3+ and Ho 3+ were added in combination as rare earth metal ions are presumed to be based on Tm 3+ depending on the combination.
- the peak near 480 nm, the peak near 550 nm presumed to be based on Er 3+ and Ho 3+ , and the peak near 650 nm presumed to be based on Ho 3+ were observed.
- the luminescent color observed by human vision is white for the combination of Tm 3+ and Ho 3+ (Examples 59 to 62), and the combination of Tm 3+ and Er 3+ (Examples 63 to 65).
- FIGS. 3 and 4 show the emission spectra of the samples of Examples 1 to 7.
- the measurement results (FIG. 3: wavelength range of 450 to 510 nm, FIG. 4: wavelength range of 750 to 850 nm) are shown. From the results shown in FIGS. 3 and 4, it can be confirmed that the content ratio of Tm 3+ has an influence on the light emission characteristics, and in order to obtain excellent light emission characteristics, a range of 0.05 to 1 at%, particularly It was confirmed that the range of 0.05 to 0.5 at% was preferable.
- FIGS. 5 and 6 show the measurement results of the emission spectra of the samples of Examples 1, 8 to 12 and Comparative Example 1 (FIG. 5: 450 to 510 nm).
- FIG. 6 shows a wavelength range of 750 to 850 nm.
- Yb 3+ is an essential component for obtaining the desired upconversion light emission. It was confirmed that there was.
- the Yb 3+ content ratio affects the light emission characteristics, and in order to obtain excellent light emission characteristics, the Yb 3+ content ratio is 20 at% or less, In particular, it was confirmed that the range of 5 to 15 at% was preferable.
- FIGS. 7 and 8 show the measurement results of emission spectra of the samples of Examples 1, 13 to 15 and Comparative Example 2 (FIG. 7: 450 to 510 nm).
- FIG. 8 shows a wavelength range (a wavelength range of 750 to 850 nm).
- Comparative Example 2 containing no monovalent metal ions
- the monovalent metal ions specified in the present invention are essential components. did it.
- K + , Na + and Li + were preferable, K + and Na + were more preferable, and K + was particularly preferable in order to obtain excellent light emission characteristics.
- FIGS. 9 and 10 show the measurement results of emission spectra of the samples of Examples 1, 16 to 20 and Comparative Example 2 (FIG. 9: 450 to FIG. 10 shows a wavelength range of 510 nm, FIG. 10: a wavelength range of 750 to 850 nm. From the results shown in FIGS. 9 and 10, it can be confirmed that the content ratio of monovalent metal ions has an influence on the light emission characteristics, and in order to obtain excellent light emission characteristics, the content ratio of monovalent metal ions is 20 at. % Or less, particularly in the range of 5 to 15 at% was confirmed. *
- FIG. 11 shows the luminescence of each sample of Examples 21 to 26 and Comparative Example 3 The measurement result of a spectrum is shown.
- the peak of each example is a peak derived from Er 3+. It could be confirmed.
- the Er 3+ content ratio has an influence on the light emission characteristics, and in order to obtain excellent light emission characteristics, the Er 3+ content ratio is 0.1 to It was confirmed that the range of 2 at%, particularly the range of 0.2 to 0.6 at% was preferable.
- FIG. 12 shows the measurement results of the emission spectra of the samples of Examples 21, 27 to 31 and Comparative Example 4.
- the graph which plotted the emitted light intensity of each Example and comparative example in 522 nm, 533 nm, 547 nm, and 554 nm was also written together.
- Yb 3+ is an essential component for obtaining the desired upconversion emission.
- the Yb 3+ content ratio affects the light emission characteristics, and in order to obtain excellent light emission characteristics, the Yb 3+ content ratio is 5 to 15 at%. It was confirmed that the above range was preferable.
- FIG. 13 shows the measurement results of the emission spectra of the samples of Examples 21, 32 to 34 and Comparative Example 5.
- the graph which plotted the emitted light intensity of each Example and comparative example in 522 nm, 533 nm, and 555 nm was also written together.
- the monovalent metal ions of the present invention are essential for obtaining the desired upconversion light emission. It was confirmed that it was a contained component.
- K + , Na + and Rb + were preferable, K + and Na + were more preferable, and K + was particularly preferable in order to obtain excellent light emission characteristics.
- FIG. 14 shows the measurement results of emission spectra of the samples of Examples 21, 35 to 38 and Comparative Example 5.
- the graph which plotted the emitted light intensity of each Example and comparative example in 533 nm and 555 nm was also written together. From the results shown in FIG. 14, it can be confirmed that the content ratio of monovalent metal ions has an influence on the light emission characteristics, and in order to obtain excellent light emission characteristics, the content ratio of monovalent metal ions is 5 to 15 at. % Range was confirmed to be preferable.
- FIG. 15 shows the measurement results of the emission spectra of the samples of Examples 39 to 46 Is shown. From the results shown in FIG. 15, it can be confirmed that the Ho 3+ content ratio affects the light emission characteristics, and in order to obtain excellent light emission characteristics, the Ho 3+ content ratio is 2 at% or less. In particular, it was confirmed that the range of 0.03 to 1 at% was preferable.
- FIG. 16 shows the measurement results of the emission spectra of the samples of Examples 41, 47 to 51, and Comparative Example 6.
- Yb 3+ is an essential component for obtaining the desired upconversion emission.
- the Yb 3+ content ratio affects the light emission characteristics, and in order to obtain excellent light emission characteristics, the Yb 3+ content ratio is 20 at% or less, In particular, it was confirmed that the range of 5 to 15 at% was preferable.
- FIG. 17 shows the measurement results of the emission spectra of the samples of Examples 41, 52 to 54, and Comparative Example 7.
- the monovalent metal ions of the present invention are essential for obtaining the desired upconversion emission. It was confirmed that it was a contained component. Further, from the results of each Example, it was confirmed that K + , Na + and Rb + were preferable and K + and Na + were more preferable in order to obtain excellent light emission characteristics.
- FIG. 18 shows the measurement results of emission spectra of the samples of Examples 41, 55 to 58, and Comparative Example 7. From the results shown in FIG. 18, it can be confirmed that the content ratio of monovalent metal ions has an influence on the light emission characteristics, and in order to obtain excellent light emission characteristics, the content ratio of monovalent metal ions is 5 to 15 at. % Range was confirmed to be preferable. *
- FIG. 19 shows emission spectra of samples (combined use of Tm 3+ and Ho 3+ ) of Examples 59 to 62
- FIG. 20 shows the measurement results of the emission spectra of the samples of Examples 63 to 65 (combined use of Tm 3+ and Er 3+ ).
- FIG. 21 shows the measurement results of the examples. The measurement results of the emission spectra of the respective samples 66 to 68 (combination of Er 3+ and Ho 3+ ) are shown.
- the samples of Examples 69 to 74 (Tm 3+ , Er 3+ and Ho 3+ It shows the measurement results of the emission spectrum of the combination of the three. From the results shown in FIGS. 19 to 22, when a plurality of the rare earth metal ions according to the present invention are combined, the peak intensity can be changed according to the content ratio, and the emission color can be controlled. Was confirmed.
- FIGS. 23 to 25 show the measurement results of emission spectra of the samples of Examples 1 and 75 to 79.
- the up-conversion phosphor of the present invention can be applied to the same applications as conventional phosphors such as a color display, an infrared sensor, optical recording data, and a laser material.
- conventional phosphors such as a color display, an infrared sensor, optical recording data, and a laser material.
- a low energy excitation light source can be used, it is suitable as a phosphor excellent in energy saving and stability, replacing the conventional down-conversion phosphor.
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Abstract
Description
、前記希土類金属イオン及び前記1価金属イオンの合計を100at%としたときのHo3+の含有比率(以下、単に「Ho3+の含有比率」ということがある)が5at%以下であることが好ましく、2at%以下であることがより好ましく、0.03~1at%の範囲が特に好ましい。
4:Yb3+,Ho3+,K+で表され、Yb3+,Ho3+及びK+の各含有比率が下表9のとおりである各粉末を得た。
性への影響 図7,8は、実施例1,13~15、比較例2の各試料の発光スペクトルの測定結果(図7:450~510nmの波長域、図8:750~850nmの波長域)を示すものである。 図7,8に示す結果において、まず、比較例2(1価金属イオン非含有)と他の実施例との対比から、本発明所定の1価金属イオンが必須の含有成分であることが確認できた。 また、各実施例の結果から、優れた発光特性を得るためには、K+,Na+,Li+が好ましく、K+,Na+がより好ましく、K+が特に好ましいことが確認できた。
Claims (6)
- ZnMoO4系の母体材料に、Yb3+と、Tm3+,Er3+及びHo3+からなる群より選ばれる少なくとも1種の希土類金属イオンと、Li+,K+,Na+及びRb+からなる群より選ばれる少なくとも1種の1価金属イオンとを含む、アップコンバージョン蛍光体。
- 前記母体材料中の2価金属イオン、Yb3+、前記希土類金属イオン及び前記1価金属イオンの合計を100at%としたときのYb3+の含有比率が20at%以下である、請求項1に記載のアップコンバージョン蛍光体。
- 前記希土類金属イオンがTm3+であり、前記母体材料中の2価金属イオン、Yb3+、前記希土類金属イオン及び前記1価金属イオンの合計を100at%としたときのTm3+の含有比率が2at%以下である、請求項1又は2に記載のアップコンバージョン蛍光体。
- 前記希土類金属イオンがEr3+であり、前記母体材料中の2価金属イオン、Yb3+、前記希土類金属イオン及び前記1価金属イオンの合計を100at%としたときのEr3+の含有比率が5at%以下である、請求項1又は2に記載のアップコンバージョン蛍光体。
- 前記希土類金属イオンがHo3+であり、前記母体材料中の2価金属イオン、Yb3+、前記希土類金属イオン及び前記1価金属イオンの合計を100at%としたときのHo3+の含有比率が5at%以下である、請求項1又は2に記載のアップコンバージョン蛍光体。
- 前記母体材料中の2価金属イオン、Yb3+、前記希土類金属イオン及び前記1価金属イオンの合計を100at%としたときの前記1価金属イオンの含有比率が20at%以下である、請求項1から5までのいずれかに記載のアップコンバージョン蛍光体。
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JP2016504105A JP6190941B2 (ja) | 2014-02-24 | 2015-02-17 | アップコンバージョン蛍光体 |
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JP2007046002A (ja) * | 2005-08-12 | 2007-02-22 | Canon Inc | 複合酸化物蛍光体とその製造方法及び発光素子 |
JP2013014651A (ja) * | 2011-07-01 | 2013-01-24 | Tokyo Institute Of Technology | 蛍光粒子およびその製造方法 |
JP2013060568A (ja) * | 2011-09-15 | 2013-04-04 | Tokai Univ | アップコンバージョン型蛍光体 |
JP2014234479A (ja) * | 2013-06-04 | 2014-12-15 | 裕彦 後藤 | アップコンバージョン蛍光体及びその製造方法 |
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CN101037804A (zh) * | 2006-03-17 | 2007-09-19 | 中国科学院福建物质结构研究所 | 双掺镱铒离子钼酸钆钠激光晶体及其制备方法和用途 |
CN101928562B (zh) * | 2009-10-21 | 2013-11-06 | 南昌大学 | 一种可同时被近紫外和蓝色led光有效激发的红色荧光粉 |
CN102277162A (zh) * | 2011-06-21 | 2011-12-14 | 南昌大学 | 铕掺杂水合钼酸锌高效红色荧光粉及其制备方法 |
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JP2007046002A (ja) * | 2005-08-12 | 2007-02-22 | Canon Inc | 複合酸化物蛍光体とその製造方法及び発光素子 |
JP2013014651A (ja) * | 2011-07-01 | 2013-01-24 | Tokyo Institute Of Technology | 蛍光粒子およびその製造方法 |
JP2013060568A (ja) * | 2011-09-15 | 2013-04-04 | Tokai Univ | アップコンバージョン型蛍光体 |
JP2014234479A (ja) * | 2013-06-04 | 2014-12-15 | 裕彦 後藤 | アップコンバージョン蛍光体及びその製造方法 |
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CN106029833B (zh) | 2019-06-07 |
JP6190941B2 (ja) | 2017-08-30 |
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EP2985332B1 (en) | 2017-05-31 |
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