KR20170029233A - Phophor emitting red-color band range and light emitting device package using the same - Google Patents
Phophor emitting red-color band range and light emitting device package using the same Download PDFInfo
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- KR20170029233A KR20170029233A KR1020150126293A KR20150126293A KR20170029233A KR 20170029233 A KR20170029233 A KR 20170029233A KR 1020150126293 A KR1020150126293 A KR 1020150126293A KR 20150126293 A KR20150126293 A KR 20150126293A KR 20170029233 A KR20170029233 A KR 20170029233A
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 114
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052706 scandium Inorganic materials 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 5
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 5
- 229910052788 barium Inorganic materials 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 9
- 150000002500 ions Chemical class 0.000 description 30
- 230000005284 excitation Effects 0.000 description 15
- 229910052693 Europium Inorganic materials 0.000 description 13
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 13
- 239000002994 raw material Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000000295 emission spectrum Methods 0.000 description 10
- 238000003786 synthesis reaction Methods 0.000 description 10
- 229910052712 strontium Inorganic materials 0.000 description 9
- 230000007704 transition Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 150000004767 nitrides Chemical class 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 6
- 150000001768 cations Chemical class 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005286 illumination Methods 0.000 description 5
- 238000004020 luminiscence type Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000012190 activator Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- -1 rare earth metal ions Chemical class 0.000 description 3
- 238000009877 rendering Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000695 excitation spectrum Methods 0.000 description 2
- 238000001748 luminescence spectrum Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001427 strontium ion Inorganic materials 0.000 description 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005090 crystal field Methods 0.000 description 1
- 229910001940 europium oxide Inorganic materials 0.000 description 1
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910003443 lutetium oxide Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- MPARYNQUYZOBJM-UHFFFAOYSA-N oxo(oxolutetiooxy)lutetium Chemical compound O=[Lu]O[Lu]=O MPARYNQUYZOBJM-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- VYYXSBLCDOWRNX-UHFFFAOYSA-N strontium oxygen(2-) yttrium(3+) Chemical compound [Sr+2].[O-2].[Y+3] VYYXSBLCDOWRNX-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/55—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing beryllium, magnesium, alkali metals or alkaline earth metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Luminescent Compositions (AREA)
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a phosphor, and more particularly, to a red light emitting phosphor and a light emitting device package using the same. The present invention relates to a phosphorescent material which emits light having a main absorption band in a blue wavelength band and a main peak in a red wavelength band,
(1) SrA 2 O 4 : Eu
Eu is partially substituted with Sr, and A is any one of Y, Gd, La, Sc, B, Al and Ga.
Description
BACKGROUND OF THE
A light emitting diode (LED) that emits white light is one of the next-generation light emitting device candidates that can replace the fluorescent lamp, which is the most representative of the conventional general illumination.
Light emitting diodes have less power consumption than conventional light sources, and unlike fluorescent lamps, they do not contain mercury and can be said to be environmentally friendly. In addition, it has a longer life span and faster response time than conventional light sources.
There are three methods for manufacturing a white light emitting diode. One is a method of combining white light by combining red, green and blue LEDs, a method of applying white light by applying a yellow phosphor to a blue LED, A white light is realized by combining red, green and blue LEDs.
Among them, the method of applying the yellow phosphor to the blue LED to realize the white light is the most representative method of realizing the white light by using the light emitting diode.
The white light emitted by this method is high in brightness but has a wide wavelength interval of blue and yellow, which easily causes a scintillation effect due to color separation, making mass production of white LEDs having the same color coordinates difficult.
Furthermore, it is not easy to adjust the color temperature and the color rendering index (CRI), which are important factors in the illumination light source.
Accordingly, attempts have been made to overcome such disadvantages by increasing the emission spectrum by adding phosphors that emit red light. However, further studies are required to develop and improve the efficiency of the phosphor materials emitting red light.
SUMMARY OF THE INVENTION The present invention provides a red light emitting phosphor capable of providing a red phosphor having high light conversion efficiency and excellent color purity using a near ultraviolet or blue excitation source, and a light emitting device package using the red light emitting phosphor.
According to a first aspect of the present invention, there is provided a red-light-emitting phosphor which emits light having a main absorption band in a blue wavelength band and a main peak in a red wavelength band, And,
(1) SrA 2 O 4 : Eu
Eu is partially substituted with Sr, and A is any one of Y, Gd, La, Sc, B, Al and Ga.
Here, the light in the red wavelength band may have a central wavelength at 560 nm to 680 nm.
Here, the red wavelength band may include at least a part of the 550 nm to 800 nm band.
Here, the blue wavelength band may include at least a part of the band of 350 nm to 500 nm.
In the formula (1), europium (Eu) may have a composition of 0.01% to 20% with respect to strontium (Sr).
More specifically, the europium (Eu) may have a composition of 0.5% to 3% with respect to strontium (Sr).
According to a second aspect of the present invention, there is provided a red-light-emitting phosphor which emits light having a main absorption band in a blue wavelength band and a main peak in a red wavelength band, And,
(Sr 1 - x B x ) Y 2 O 4 : Eu y
The Eu is substituted with a divalent ion, and the B is any one of Ca, Ba and Mg.
Here, the light in the red wavelength band may have a central wavelength at 560 nm to 680 nm.
Here, the red wavelength band may include at least a part of the 550 nm to 800 nm band.
Here, the blue wavelength band may include at least a part of the band of 350 nm to 500 nm.
In the formula (2), x and y may satisfy the conditions of 0 < x < 1 and 0.0001 y 0.2.
According to a third aspect of the present invention, there is provided a light emitting device package including the phosphor represented by Formula 1 or the phosphor represented by Formula 2.
The present invention has the following effects.
The present invention can provide a phosphor emitting red light having a high efficiency at a long wavelength of 400 nm or more and a strong and broad band shape.
Among the light emitting devices using the blue excitation source as a light source, the phosphor according to the present invention is a light emitting device using a phosphor such as a white LED using a yellow phosphor and a blue light emitting diode (LED) It is possible to greatly increase the efficiency in a lighting and display device using the light emitting element as an excitation light source.
As described above, the SrY 2 O 4 : Eu 2 + phosphor synthesized through 4f-5d transition of the present invention improved the excitation efficiency at a long wavelength of 400 nm or more by substituting active ions for Sr 2 + ion sites, It is possible to provide a phosphor which emits red light in the form of a broad band.
In addition, it is possible to provide a phosphor that emits red light in a strong and broad band shape while diversifying the emission wavelength by replacing the divalent cation with the Sr ion or substituting the trivalent cation with the Y ion.
That is, it is possible to provide a phosphor capable of reproducing a high color rendering property by realizing a long-wavelength red phosphor having an emission wavelength of 640 nm or more.
In addition, it is possible to provide a phosphor that is suitable for application as a phosphor for illumination in high light by realizing a red phosphor having an emission wavelength in the range of 580 nm to 630 nm.
The red phosphorescent phosphor of the present invention is a novel phosphor that has not existed so far and can be used for a light emitting element or a display element.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing an excitation spectrum of SrY 2 O 4 : Eu 3 + ;
2 is a diagram showing the emission spectrum of SrY 2 O 4 : Eu 3 + .
3 is a diagram showing the emission spectrum of the red light-emitting phosphor of the present invention.
4 is a diagram showing XRD measurement spectrum of the red light-emitting phosphor of the present invention.
5 shows the emission spectra of the respective red light-emitting phosphors of the present invention represented by the general formula (2).
6 shows the emission spectrum of each example of the red light-emitting phosphor of the present invention represented by the formula (1).
7 is a schematic view showing an example of a light emitting device package using the red light emitting phosphor of the present invention.
8 is a schematic view showing another example of a light emitting device package using the red light emitting phosphor of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.
It will be appreciated that when an element such as a layer, region or substrate is referred to as being present on another element "on," it may be directly on the other element or there may be an intermediate element in between .
Although the terms first, second, etc. may be used to describe various elements, components, regions, layers and / or regions, such elements, components, regions, layers and / And should not be limited by these terms.
The present invention provides a red light-emitting phosphor having a main absorption band in a blue wavelength band and emitting light having a main peak in a red wavelength band and represented by the following formula (1).
The Eu may be partially substituted with a divalent ion, that is, Sr, and the A may be any one of Y, Gd, La, Sc, B, Al and Ga.
Here, light in the red wavelength band may have a central wavelength at 560 nm to 680 nm. That is, the main peak located in the red wavelength band is located in the wavelength band of 560 nm to 680 nm.
Further, the red wavelength band may include at least a part of the 550 nm to 800 nm band.
Here, the blue wavelength band may include at least a part of the band of 350 nm to 500 nm.
In Formula (1), europium (Eu) may have a composition of 0.01% to 20% with respect to strontium (Sr).
More specifically, the europium (Eu) may have a composition of 0.5% to 3% with respect to strontium (Sr).
When such a composition of europium (Eu) versus strontium (Sr) is provided, the red light-emitting phosphor can exhibit an optimum excitation wavelength, light emission wavelength, and luminous efficiency.
That is, when the composition of europium (Eu) relative to strontium (Sr) is 0.0001 to 0.2, a phosphor capable of emitting red light by being excited by blue light as described above can be realized, Sr, the composition of the Eu is 0.005 to 0.03, the optimum excitation wavelength, emission wavelength, and luminous efficiency can be exhibited.
On the other hand, the present invention provides a red light-emitting phosphor represented by the following formula (2), having a main absorption band in the blue wavelength band and emitting light having a main peak in the red wavelength band.
In the formula (2), Eu is substituted with a divalent ion (i.e., the sum of elements of Sr and B), and B may be any one of Ca, Ba and Mg. That is, any one element of Ca, Ba, and Mg can be substituted with Sr to form a phosphor.
Here, light in the red wavelength band may have a central wavelength at 560 nm to 680 nm. That is, the main peak located in the red wavelength band is located in the wavelength band of 560 nm to 680 nm.
Further, the red wavelength band may include at least a part of the 550 nm to 800 nm band.
Here, the blue wavelength band may include at least a part of the band of 350 nm to 500 nm.
Accordingly, the red light-emitting fluorescent substances represented by
Further, such a red light-emitting phosphor may be excited by near-ultraviolet rays to emit red light.
Here, x and y in formula (2) can satisfy the conditions of 0 < x < 1 and 0.0001 y 0.2.
That is, in the formula (2), the element B may have a composition of more than 0 and less than 1 with respect to all the elements of the material constituting the phosphor. At this time, the europium (Eu) may have a composition of 0.0001 to 0.2 with respect to all the elements of the material forming the phosphor.
When such a B element and europium (Eu) as an activator have the above composition, the red light-emitting phosphor can exhibit an optimal excitation wavelength, emission wavelength, and light emission efficiency.
That is, when the B element and the europium (Eu) as the activator each have a composition of more than 0 and less than 1 and 0.0001 to 0.2 with respect to all the elements of the phosphor, the red light is excited by the blue light as described above It is possible to exhibit an optimum luminescence efficiency as a phosphor that emits light.
As described above, the present invention can provide a red phosphor having high light conversion efficiency and excellent color purity by using the near ultraviolet light and the blue light emitting element as an excitation source.
A strontium yttrium oxide (SrY 2 O 4 ) phosphor in which europium (Eu) is substituted (doped) is a form in which Eu 3 + ions are substituted with Y 3 + ion sites.
In other words, when europium (Eu), which is an active ion, is substituted with SrY 2 O 4 , Eu is oxidized due to oxidation reaction by high temperature synthesis and exists as a stable form of Eu 3 + , and Y 3 + And is synthesized with SrY 2 O 4 : Eu 3 + .
For reference, the ionic radius of the Eu is 117 pm and the
Thus, SrY 2 O 4: the rare earth metal ions are three horizontal substituted as Eu + 3 are typically emitted by the 4f level between (4f-4f) transition. Typically this will be an ion such as Eu 3 +, Tb 3 +, Sm 3 +, Gd 3 +, Pr 3 +, Dy 3+ equivalents.
As described above, when the active ion is substituted by the trivalent ion, the 4f electrons shielded by the 5s and 5p electrons have very small interaction with the surrounding ions, so that the size of the crystal field is very small, The distance from the equilibrium position is very small.
Therefore, as shown in Fig. 1 and Fig. 2, the luminescence spectrum shows intrinsic luminescence spectrum which does not largely change according to the composition of the matrix, and the luminescence band is generally narrow.
Here, FIG. 1 shows the excitation spectrum of SrY 2 O 4 : Eu 3 + , and FIG. 2 shows the emission spectrum.
As such, since it exhibits needle-shaped luminescence of various rods due to the transition of 4f-4f of trivalent active ion Eu 3+ , it is not suitable as a fluorescent material of a continuous type light emitting device such as illumination.
Further, as shown in Fig. 1, the excitation efficiency is rapidly lowered at a wavelength of 250 nm or more at the excitation wavelength. Therefore, it is not easy to apply to ultraviolet (UV) light and blue light sources whose wavelength is 400 nm or more.
On the other hand, in order to design a phosphor having an excitation wavelength of 400 nm or more and a strong and broad emission band as in the present invention, it is necessary to design an active ion which causes 4f-5d transition. Representative examples include Ce 3 + , Eu 2+ , Sm 2 + , and Yb 2 + .
Therefore, in the present invention, trivalent (
As described above, the active ions and europium (Eu) is SrY 2 when substituted for O 4, is Eu oxide as the oxidation reaction by high-temperature synthesis and exist in a stable form of Eu 3 +, a similar ionic radius Y 3 + And is synthesized with SrY 2 O 4 : Eu 3 + .
However, in the high-temperature synthesis, it is possible to replace the oxide-based raw material with the nitride-based raw material to prevent oxidation from occurring through the raw material during synthesis and to synthesize under high pressure to block the inflow of oxygen.
Therefore, Eu 2 + ions exist in two positions by this synthesis, and Eu can be substituted into Sr sites having similar ionic radius to synthesize SrY 2 O 4 : Eu 2 + .
The phosphor thus synthesized is a phosphor in which Eu is substituted for Sr, and means the same phosphor as the above-described formula (1).
Fig. 3 shows an example of the emission spectrum of the red light-emitting phosphor of the present invention.
The thus synthesized SrY 2 O 4 : Eu 2 + phosphor exhibits maximum absorption at a wavelength of 470 nm by increasing the excitation efficiency at a wavelength of 400 nm or more.
As shown in FIG. 3, a light emission pattern having a wide band due to a transition of 4f-5d can be seen. This is clearly distinguished from the emission spectrum by the 4f level transition shown in Fig.
4 is SrY 2 O 4: is a diagram showing the XRD measurement spectrum of Eu 2 + phosphor fluorescent materials. On the upper side of FIG. 4, a peak list (center) of the XRD measurement spectrum of Y 2 O 3 and a peak list (upper) of the XRD measurement spectrum of SrYO are shown.
As shown in FIG. 4, it can be confirmed that the phosphor synthesized in the present invention has the same crystal structure as SrY 2 O 4 .
As described above, the red light-emitting phosphor of the present invention represented by the formula (1), (2) or SrY 2 O 4 : Eu 2 + can be synthesized by preventing the oxidation of Eu ions.
A method for preventing the oxidation of Eu 2 + is as follows.
First, the synthesis proceeds at a relatively high pressure. Synthesis can be achieved at pressures above 9 bar.
Second, a nitride-based raw material is used as a raw material for phosphor synthesis. Such a nitride-based raw material may be Sr 3 N 2 .
In addition, at least one of strontium oxide, lutetium oxide and europium oxide may be used.
Further, the phosphors described above can be synthesized by synthesizing at a temperature condition of 1000 캜 or higher (about 1000 캜 to 1600 캜) for 3 hours or more.
It is confirmed that even in the SrY 2 O 4 : Eu 2 + phosphor, the phosphor of the formula (1) in which the Y element is substituted with another element exhibits excellent luminescence properties
It is also confirmed that the SrY 2 O 4 : Eu 2 + phosphor exhibits excellent luminescence characteristics even in the case of the phosphor of the formula (2) in which the Sr element is substituted with another element.
As described above, in the SrY 2 O 4 : Eu 2 + phosphor, cations of the same valence (Sr 2 + , Y 3 + ) are substituted for host metal sites and excited by blue or near ultraviolet light, A phosphor can be realized. The emission wavelength of such a phosphor can be realized from 560 nm to 680 nm.
Hereinafter, specific examples will be described.
Example
In order to synthesize the red light-emitting phosphor represented by the general formula (1) or (2), synthesis was carried out at a high pressure of 9 atm.
In addition, oxide-based and nitride-based raw materials can be used as raw materials for phosphor synthesis. Sr 3 N 2 , SrCO 3 , Y 2 O 3 and Eu 2 O 3 can be mainly used as the raw material.
Here, it may further include at least one of an oxide-based or a nitride-based material including a raw material that can be substituted with Sr, for example, Ca, Ba, and Mg.
Further, it may further include at least one of an oxide-based or a nitride-based material including a raw material that can be substituted with Y, for example, Gd, La, Sc, B, Al and Ga.
Thus, the phosphor described above can be synthesized by synthesizing at a temperature of 9 atm and 1450 캜 for 3 hours.
As shown in FIG. 4, it can be confirmed that the phosphor thus synthesized has the same crystal structure as the crystal structure SrY 2 O 4 .
As described above, a phosphor material of a new composition capable of realizing high-efficiency red light emission and serving as a phosphor can be produced.
Table 1 shows each example of the phosphor represented by the formula (2) together with the composition and the peak wavelength.
5 shows the emission spectra of the respective examples of the phosphor represented by the formula (2).
As shown in each Example, Example 1 shows an example of SrY 2 O 4 : Eu, Examples 2 and 3 show emission wavelengths of peaks in which
It can be seen from Examples 1 to 3 that red phosphors having peak wavelengths of 602 nm, 590 nm and 620 nm can be realized, respectively.
Table 2 shows each example of the phosphor represented by the formula (2) together with the composition and the peak wavelength.
6 shows the emission spectrum of each example of the phosphor represented by the formula (1).
As shown in the respective Examples, Example 1 shows an example of SrY 2 O 4 : Eu, Examples 4 to 6 show emission wavelengths of phosphors in which Y 3 ions are replaced with Lu, Sc and Gd, (peak wavelength) and spectrum. In each example, the content of Eu as an activator was 5 mol% of divalent ions (Sr) and synthesized under the same conditions.
It can be seen from Examples 4 to 6 that the red phosphors can be realized in a wide wavelength band including peak wavelengths of 610 nm, 670 nm and 629 nm, respectively.
As described above, the SrY 2 O 4 : Eu 2 + phosphor synthesized through 4f-5d transition of the present invention improved the excitation efficiency at a long wavelength of 400 nm or longer by substituting active ions for Sr 2 + ion sites, It is possible to provide a phosphor which emits red light in a strong and broad band form.
Among the light emitting devices using the blue or near ultraviolet ray excitation source as the light source, the phosphor according to the present invention is preferably a phosphor converted LED using a phosphor such as a white LED using a yellow phosphor and a blue LED, It is possible to greatly increase the efficiency in a lighting and display device using the light emitting element as an excitation light source.
The red phosphorescent phosphor of the present invention is a novel phosphor that has not existed so far and can be used for a light emitting element or a display element.
In addition, it is possible to provide a phosphor that emits red light in a strong and broad band shape while diversifying the emission wavelength by replacing the divalent cation with the Sr ion or substituting the trivalent cation with the Y ion.
That is, it is possible to provide a phosphor which can realize a long-wavelength red phosphor having an emission wavelength of 640 nm or more as in the example of Example 5 and can reproduce high color rendering properties.
Further, it is possible to provide a phosphor suitable for application to a phosphor for illumination in a high luminance by implementing a red phosphor having an emission wavelength in the range of 590 nm to 629 nm as in Examples 1, 2, 3, 4 and 6 .
7 shows an example of a light emitting device package using the red light emitting phosphor of the present invention.
The
At this time, the
A
8 shows another example of the light emitting device package using the red light emitting phosphor of the present invention.
As shown in the figure, a
That is, the
At this time, the
Although the red light emitting phosphor of the present invention is used in the light emitting device package, phosphors emitting light of different colors may be used together. The red light emitting phosphor may also be a PDP, a CRT, a FED It goes without saying that the present invention can also be applied to an apparatus.
It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.
10: Package body 11: Reflective cup
20: light emitting element 30: filler
40: Phosphor layer 41: Phosphor
50: lens
Claims (12)
And has a main absorption band in a blue wavelength band and emits light having a main peak in a red wavelength band,
(1) SrA 2 O 4 : Eu
Wherein Eu is partially substituted with Sr and A is any one of Y, Gd, La, Sc, B, Al, and Ga.
And has a main absorption band in a blue wavelength band and emits light having a main peak in a red wavelength band,
(Sr 1 - x B x ) Y 2 O 4 : Eu y
Wherein Eu is substituted with a divalent ion, and B is any one of Ca, Ba and Mg.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150126293A KR20170029233A (en) | 2015-09-07 | 2015-09-07 | Phophor emitting red-color band range and light emitting device package using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150126293A KR20170029233A (en) | 2015-09-07 | 2015-09-07 | Phophor emitting red-color band range and light emitting device package using the same |
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| Publication Number | Publication Date |
|---|---|
| KR20170029233A true KR20170029233A (en) | 2017-03-15 |
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| KR1020150126293A KR20170029233A (en) | 2015-09-07 | 2015-09-07 | Phophor emitting red-color band range and light emitting device package using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139074A (en) * | 2020-01-21 | 2020-05-12 | 济南大学 | Temperature-sensitive fluorescent powder and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139074A (en) * | 2020-01-21 | 2020-05-12 | 济南大学 | Temperature-sensitive fluorescent powder and preparation method and application thereof |
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