KR20120139650A - Light emitting device - Google Patents

Abstract

PURPOSE: A light emitting device is provided to improve energy conversion efficiency by efficiently using light of an ultraviolet wavelength region that is an excitation light source. CONSTITUTION: A first light emitting diode(50) emits ultraviolet light. A first fluorescent material(91) is arranged around the first light emitting diode. A second fluorescent material(92) is arranged around the first light emitting diode. A third fluorescent material is arranged around the first light emitting diode. A second light emitting diode(60) emits red light whose wavelength is different from the wavelength of light emitted from the first and second fluorescent materials.

Description

Light emitting device

The present invention relates to a light emitting device, and more particularly, to a light emitting device having improved energy conversion efficiency by using an ultraviolet light emitting diode as an excitation light source of a fluorescent material.

A light emitting diode (LED) is a compound semiconductor having a pn junction structure, and refers to a device that emits a predetermined light by recombination of minority carriers (electrons or holes), and has a low power consumption, a long life, and a narrow structure. As it can be installed in one space and provides a strong resistance to vibration, it is being used not only as a component of various information processing and communication devices but also as a lighting device for various applications, and is being manufactured in various types of light emitting devices suitable for each application. In particular, recently, white light emitting devices have been introduced in addition to devices emitting single wavelengths such as blue, green, or red, and white light emitting devices are expected to increase rapidly as they are applied to automotive and general lighting products.

A method of implementing a white light emitting device typically includes a yellow fluorescent material disposed on a blue light emitting diode, thereby realizing white color by mixing a mixture of blue light emitted from a blue light emitting diode and yellow light emitted from a phosphor excited by a part of the blue light. That's the way it is. Such a white light emission method has an advantage that the composition is simple and excellent in mass production, but there is a problem in that the color rendering is low due to the spectrum deficiency of the green and red regions.

In another exemplary embodiment of the white light emitting device, a white phosphor may be obtained by disposing a fluorescent material excited by ultraviolet light to emit blue, green, and red light on the light emitting diode that emits ultraviolet light.

This method has the advantage of high color rendering by emitting light from the blue to the red region using ultraviolet light, which has a higher energy of the excitation light source than blue light, but many fluorescent materials such as blue, green and red are used. The manufacturing cost is high.

In particular, the commercially available red fluorescent substance is a sulfide-based, and the light characteristic of the light emitting device is easily reacted with moisture and carbon dioxide in the air, which is easily exposed during operation, and thus loses optical characteristics. It has the disadvantage of corroding the same metal, there is a problem that the reliability is lowered.

In addition, the red fluorescent material has a lower conversion efficiency of light excited and emitted by the energy of the excitation light source than the fluorescent material such as blue and green.

An object of the present invention is to provide a white light emitting device having improved energy conversion efficiency by efficiently using light in an ultraviolet wavelength region that is an excitation light source of a fluorescent material.

Another object of the present invention is to provide a white light emitting device having improved reliability in moisture, carbon dioxide, etc. that the light emitting device is easily exposed during operation by using a light emitting diode that emits light having a wavelength different from that of the excitation light emitted from the fluorescent material. do.

A light emitting device according to an embodiment of the present invention, the first light emitting diode for emitting ultraviolet light; A first fluorescent material disposed around the first light emitting diode; A second fluorescent material disposed around the first light emitting diode; A third fluorescent substance disposed around the first light emitting diode; And at least one second light emitting diode, wherein the first fluorescent material is excited by light emitted from the first light emitting diode, and the peak wavelength of the light excited by the first fluorescent material is emitted from the first light emitting diode The second wavelength is longer than the peak wavelength of the emitted light, and the second fluorescent material is excited by light emitted from the first light emitting diode, and the peak wavelength of light excited by the second fluorescent material is the peak wavelength of light emitted from the first light emitting diode. And a wavelength longer than the peak wavelength of light excited by the first fluorescent material, wherein the third fluorescent material is excited by light emitted from the first light emitting diode, and the peak wavelength of the light excited by the third fluorescent material is determined by the first wavelength. Peak wavelength of light emitted from the light emitting diode, peak wavelength of light excited by the first fluorescent substance, and light excited by the second fluorescent substance The light emitted from the second light emitting diode is longer than the peak wavelength of, and the light emitted from the second light emitting diode includes the peak wavelength of the light emitted from the first light emitting diode, the peak wavelength of the light excited by the first fluorescent material, and the light excited by the second fluorescent material. A peak wavelength and light having a peak wavelength different from that of the light excited by the third fluorescent substance.

The light emitting device may further include a molding part, and the first fluorescent material, the second fluorescent material, and the third fluorescent material may be disposed in the molding part.

The light emitting device may further include a first molding part and a second molding part.

In the light emitting device, any one of the first fluorescent material, the second fluorescent material, and the third fluorescent material may be disposed in the first molding part, and among the first fluorescent material, the second fluorescent material, and the third fluorescent material, Two other fluorescent materials not disposed in the first molding part may be disposed in the second molding part.

The hardness of the second molding part may be greater than the hardness of the first molding part.

In some embodiments, the peak wavelength of the first phosphor may be located in the range of 410 nm to 500 nm, and the peak wavelength of the second phosphor may be located in the range of 500 nm to 590 nm.

Further, the peak wavelength of the first light emitting diode may be located in the range of 250 nm to 410 nm, and the peak wavelength of the second light emitting diode may be located in the range of 590 nm to 720 nm.

The first fluorescent material may include a silicate-based phosphor, and the second fluorescent material may include at least one of a germanate-based phosphor and a germanate-silicate-based phosphor.

In other embodiments, the peak wavelength of the first fluorescent material may be located within the range of 440nm to 480nm, the peak wavelength of the second fluorescent material may be located within the range of 510nm to 560nm, the third fluorescent material The peak wavelength of may be located in the range of 560 nm to 620 nm.

The peak wavelength of the first light emitting diode may be located in the range of 250 nm to 350 nm, and the peak wavelength of the second light emitting diode may be located in the range of 620 nm to 660 nm.

Meanwhile, the first phosphor may include a silicate-based phosphor, and the second phosphor may include at least one of a germanate-based phosphor and a germanate-silicate-based phosphor.

In the light emitting diode, at least one of the first fluorescent material, the second fluorescent material, and the third fluorescent material emits a smaller amount of light than a conventional light source, and the light emitting device has white light having the same luminance as that of the conventional light source. Can be implemented.

In addition, a fluorescent material may not be disposed on at least one second light emitting diode.

The first fluorescent material, the second fluorescent material and the third fluorescent material may be sulfide-free fluorescent materials.

The light emitting device according to the present invention can provide a white light emitting device having improved energy conversion efficiency by efficiently using light in an ultraviolet wavelength region that is an excitation light source of a fluorescent material.

In addition, by using a light emitting diode that emits light of a wavelength different from the excitation light emitted from the fluorescent material, it is possible to provide a white light emitting device with improved reliability, such as moisture and carbon dioxide that the light emitting device is easily exposed during operation.

1 is a cross-sectional view showing a first embodiment of a light emitting device according to the present invention;
2 is a sectional view showing a second embodiment of a light emitting device according to the present invention;
3 is a sectional view showing a third embodiment of a light emitting device according to the present invention;
4 is a sectional view showing a fourth embodiment of a light emitting device according to the present invention;
5 is a sectional view showing a fifth embodiment of a light emitting device according to the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

The light emitting device according to the present invention is excited by a first light emitting diode that emits light in an ultraviolet wavelength region and light emitted from the first light emitting diode, so that a peak wavelength having a longer wavelength than that of light emitted from the first light emitting diode is obtained. A light emitting device comprising at least one fluorescent material disposed around the first light emitting diode to emit light and at least one second light emitting diode emitting light having a wavelength different from a peak wavelength of the light emitted from the fluorescent material. White light emission can be achieved by the device.

That is, a first light emitting diode emitting an ultraviolet wavelength in the range of 250 nm to 410 nm, a first fluorescent substance emitting blue light having a peak wavelength in the range of 410 nm to 500 nm, and green and yellow light having a peak wavelength in the range of 500 nm to 590 nm. It may be composed of a combination of at least one second fluorescent material emitting a second light emitting diode emitting a red wavelength within the range of 590nm to 720nm.

More preferably, the first light emitting diode in the range of 250 nm to 350 nm, the first fluorescent substance emitting blue light having a peak wavelength in the range of 440 nm to 480 nm, and the second emitting the green light having a peak wavelength in the range of 510 nm to 545 nm It may be made of a combination of a fluorescent material and a second light emitting diode emitting a red wavelength within a range of 620 nm to 660 nm.

The fluorescent material excited by the light of the ultraviolet wavelength includes at least one of a silicate-based, a germanate-based, a germanate-silicate-based fluorescent material containing copper, the fluorescent material further contains a lead Can be used.

The fluorescent material may be a silicate-based fluorescent material represented by the following formula (1).

≪ Formula 1 >

a (M ^I O), (M ^II O), (M ^III A), (M ^III ₂ O), (M ^IV ₂ O ₃ ), (M ^V _O O _p ), (SiO ₂ ), (M ^VI _x O _y )

The M ^I is at least one element selected from the group containing Cu and Pb, the M ^II is at least one element selected from the group containing Be, Mg, Ca, Sr, Ba, Zn, Cd and Mn M ^III is at least one element selected from the group containing Li, Na, K, Rb, Cs, Au and Ag, and M ^IV is at least one from the group containing B, Al, Ga and In Is selected from ^MV is Ge, V, Nb, Ta, W, Mo, Ti, Zr and Hf at least one element is selected, ^MVI is Bi, Sn, Sb, At least one element is selected from the group comprising Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, wherein A is F At least one element is selected from the group comprising Cl, Br, and I, wherein a, b, c, d, e, f, g, h, o, p, x, y is 0 <a≤2, 0 <b≤8, 0≤c≤4, 0≤d≤2, 0≤e≤2, 0≤f≤2, 0 <g≤10, 0 <h≤5, 1≤o≤2, 1≤ p To be 5, 1≤x≤2, 1≤y≤5 may be characterized.

The fluorescent material may be a germanate-based and / or germanate-silicate-based fluorescent material represented by Formula 2 below.

<Formula 2>

a (M ^I O) b (M ^II ₂ O) c (M ^II A) dGeO ₂ e (M ^III O) f (M ^IV ₂ O ₃ ) g (M ^V _o O _p ) h (M ^VI _x O _y )

The M ^I is at least one element selected from the group containing Cu and Pb, the M ^II is at least one element selected from the group containing Li, Na, K, Rb, Cs, Au, Ag, M ^III is at least one element selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd, Mn, and M ^IV is Sc, Y, B, Al, Ga, In, La At least one element is selected from the group including ^MV is composed of one or more components from the group consisting of Si, Ti, Zr, Mn, V, Nd, Ta, W, Mo, wherein ^MVI is At least one element is selected from the group containing Bi, Sn, Pr, Sm, Eu, Gd, Dy, and Tb, and A is at least one element selected from the group containing F, Cl, Br, I, A, b, c, d, e, f, g, h, o, p, x, y is 0 <a ≤ 2, 0 ≤ b ≤ 2, 0 ≤ c ≤ 10, 0 <d ≤ 10, 0 ≤ e ≤ 14, 0 ≤ f ≤ 14, 0 ≤ g ≤ 10, 0 ≤ h ≤ 2, 1 ≤ o ≤ 2, 1 ≤ p 5, may be characterized in that 1 ≤ x ≤ 2, 1 ≤ y ≤ 5.

Preferably, the silicate-based fluorescent material is represented by the following formula (3),

<Formula 3>

((Ba, Sr, Ca, Mg) _1-x (Pb, Cu) _x ) ₂ SiO ₄ : Eu, B

B is at least one element from the group consisting of Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Mn Is selected, wherein x is set within a range of 0 to 1, and Eu and B are set within a range of 0 to 0.2.

&Lt; Formula 4 >

_{Cu 0 .05 Li 0 .002 Sr 1} .5 Ba 0 .448 SiO 4: Gd, Eu

&Lt; Formula 5 >

_{Cu 0 .2 Ba 2 Zn 0 .2} Mg 0 .6 Si 2 O 7: Eu

(6)

_{Cu 0 .02 Sr 0 .38 Ba 0} .90 Ca 0 .6 Si 0 .98 Ge 0 .02 O 4: Eu 0 .1

The phosphor represented by Chemical Formula 4 emits light having a wavelength of 557 nm, the phosphor represented by Chemical Formula 5 emits light having a wavelength of 467 nm, and the phosphor represented by Chemical Formula 6 emits light having a wavelength of 563 nm. As described above, the orthosilicate-based phosphor can control the emission wavelength according to the element and the composition.

Accordingly, the light emitting device according to the present invention is excited by a first light emitting diode that emits light in an ultraviolet wavelength region and light emitted from the first light emitting diode, and has a longer wavelength peak than the wavelength of the light emitted from the first light emitting diode. At least one fluorescent material disposed around the first light emitting diode to emit light having a wavelength, that is, at least one fluorescent material emitting blue, green and yellow, and a peak wavelength of light emitted from the fluorescent material White light emission may be realized through a configuration including at least one second light emitting diode that emits light having a wavelength different from that of the light, that is, a red light emitting diode.

Accordingly, red light is emitted instead of a red phosphor having a low conversion efficiency in which the fluorescent material emits light by energy of light of an ultraviolet wavelength as an excitation light source, compared to a light emitting device including a conventional ultraviolet light emitting diode and a fluorescent material emitting blue, green, and red light. By using the diode, the energy conversion efficiency of the white light emitting device is improved.

In addition, compared to the prior art, by using a phosphor emitting a smaller amount of blue and green can implement the white light of the same brightness can be expected to reduce the cost.

In addition, it is possible to solve the problem that the optical properties are degraded by easily reacting with moisture and carbon dioxide in the atmosphere of the sulfide-based red phosphors commercially available using a red light emitting diode.

EMBODIMENT OF THE INVENTION Hereinafter, the light emitting element of this invention is demonstrated with reference to drawings.

1 is a cross-sectional view showing a first embodiment of a light emitting device according to the present invention.

Referring to the drawings, the light emitting device includes a substrate 10 and a first electrode 20 and a second electrode 30 formed on the substrate 10. A first light emitting diode 50 emitting ultraviolet light on the first electrode 20 is mounted and excited by the ultraviolet light and emits blue light and green light having a peak wavelength longer than the excitation light. And second fluorescent materials 91 and 92 are disposed on the first light emitting diode 50.

The second light emitting diode 60 is mounted on the second electrode 30 and emits red light having a wavelength different from that emitted from the first and second fluorescent materials 91 and 92.

The first and second light emitting diodes 50 and 60 electrically connect each of the light emitting diodes 50 and 60 to a third electrode (not shown) through the wire 100.

A first fluorescent material for emitting the above-mentioned blue light is included in the upper portion of the substrate 10 includes a molding portion 80 for encapsulating the first and second light emitting diodes (50, 60), the inside of the molding portion 80 91 and a second fluorescent substance 92 that emits green light.

The substrate 10 may include a reflector (not shown) formed by forming a predetermined groove in the central region of the substrate 10 through mechanical processing and giving a predetermined slope to the sidewall surface of the groove.

The first and second light emitting diodes 50 and 60 may be mounted on the bottom surface of the reflecting unit to maximize the reflection of light emitted from each light emitting diode, thereby increasing light emission efficiency.

The molding part 80 may be formed through an injection process using a mixture of a predetermined epoxy or silicone resin and the phosphors 91 and 92. In addition, after the production using a separate mold, it may be formed by pressing or heat treatment molding 80. The molding part 80 may be formed in various shapes such as a convex lens shape, a flat plate shape, and a shape having predetermined irregularities on the surface thereof.

As the first and second fluorescent materials 91 and 92 included in the molding part 80 for encapsulating the light emitting diodes 50 and 60 on the substrate 10, silicates, germaniums, and germanates are used. At least one of the silicates can be used.

As illustrated, the fluorescent materials 91 and 92 may be uniformly distributed in the molding part 80, and thus, the red light and the fluorescent materials 91 and 92 emitted from the second light emitting diode 60 may be formed. The emitted blue light and green light may be evenly mixed to realize more uniform white light. The watering part 80 may further include a fluorescent material (not shown) that emits yellow to improve color rendering.

The light emitting device of the present invention emits light in the ultraviolet wavelength region, which is excitation light, from the first light emitting diode 50, and the fluorescent materials 91 and 92 emit light by excitation light by the light in the ultraviolet wavelength region, and the second light emitting diode 60 emits light different from the above-excited light and implements a color of a desired spectral region by mixing them.

That is, ultraviolet light and red light are emitted from the ultraviolet light and the red light emitting diodes 50 and 60, and the first and second fluorescent materials 91 and 92 emit blue light and green light, respectively, by the ultraviolet light. By this, white light emission is realized.

Accordingly, the energy conversion efficiency of the white light emitting device is improved by using a red light emitting diode instead of the red phosphor having low conversion efficiency of light emitted by the energy of ultraviolet light as the excitation light source.

In addition, it is possible to realize cost reduction effect by using white light of the same intensity using phosphor emitting less blue and green light using ultraviolet light emitting diode with higher energy than blue light emitting diode used as excitation light source. Can be.

In addition, it is possible to solve the problem that the optical properties are degraded by easily reacting with moisture and carbon dioxide in the atmosphere of the sulfide-based red phosphors commercially available using a red light emitting diode.

2 is a cross-sectional view showing a second embodiment of a light emitting device according to the present invention.

Referring to the drawings, the light emitting device includes a substrate 10 and a first electrode 20 and a second electrode 30 formed on the substrate 10. A first light emitting diode 50 emitting ultraviolet light on the first electrode 20 is mounted and excited by the ultraviolet light and emits blue light and green light having a peak wavelength longer than the excitation light. And second fluorescent materials 91 and 92 are disposed on the first light emitting diode 50.

The second light emitting diode 60 is mounted on the second electrode 30 and emits red light having a wavelength different from that emitted from the first and second fluorescent materials.

The upper part of the substrate 10 includes a molding part 80 encapsulating the first and second light emitting diodes 50 and 60, and the first fluorescent material 91 emitting blue light in the molding part 80. ) And a second phosphor 92 emitting green and a scattering agent 70 together.

This is almost the same as the configuration of the first embodiment, and detailed description thereof will be omitted.

The first electrode 20 and the second electrode 30 are formed on the substrate 10, and the first and second light emitting diodes 50 and 60 are formed on the first electrode 20 and the second electrode 30. ) Are mounted, and unlike the first embodiment, the first and second light emitting diodes 50 and 60 may be independently connected to third and fourth electrodes (not shown), respectively, through the wire 100. have.

A molding part 80 for encapsulating the light emitting diodes 50 and 60 is formed on the substrate 10. The molding part 80 includes first and second fluorescent materials 91 and 92 and scattering agent 70 uniformly distributed.

As described above, the fluorescent materials 91 and 92 include the first fluorescent material 91 emitting blue light and the second fluorescent material 92 emitting green light using the ultraviolet light as the excitation source as described above. Silver silicate-based, germanate-based and germanate-silicate-based at least one can be used

The scattering agent 70 is added to make the mixing of light more smoothly, and uses particles having a size of 0.1 to 20 μm. As the scattering agent 70, at least one of SiO ₂ , Al ₂ O ₃ , TiO ₂ , Y ₂ O ₃ , CaCO _3, and MgO may be used.

As described above, the light emitting device including the scattering agent 70 scatters the light emitted from the light emitting diodes 50 and 60 by the scattering agent 70 and the light emitted from the fluorescent materials 91 and 92 so that the light emitting pattern is unnecessary. It can emit light uniformly in a wide range without forming a. Therefore, the light of different wavelengths is emitted in a wide range and more uniformly mixed, and the light emitting device may realize uniform white light.

3 is a cross-sectional view showing a third embodiment of a light emitting device according to the present invention.

Referring to the drawings, the light emitting device includes a substrate 10 and a first electrode 20 and a second electrode 30 formed on the substrate 10.

A first light emitting diode 50 emitting ultraviolet light on the first electrode 20 is mounted and excited by the ultraviolet light and emits blue light and green light having a peak wavelength longer than the excitation light. And second fluorescent materials 91 and 92 are disposed on the first light emitting diode 50.

The second light emitting diode 60 is mounted on the second electrode 30 and emits red light having a wavelength different from that emitted from the first and second fluorescent materials 91 and 92. This is almost the same as the configuration of the first embodiment, and detailed description thereof will be omitted.

The light emitting device according to the present exemplary embodiment may include the first molding part 81 for encapsulating the light emitting diodes 50 and 60 on the substrate 10 and the second molding part covering the first molding part 81 ( 82, wherein the first molding part 81 may use a silicone resin having a hardness lower than that of the second molding part 82, and thus the light emitting diodes 50 and 60 and the wire 100 may be used. The thermal stress may be alleviated, and in order to prevent deformation of the first molding part 81 due to an external force, the second molding part 82 may use an epoxy resin having a relatively high hardness value.

In the present embodiment, the second fluorescent material 92 emitting green light is included in the first molding part 81, and the first fluorescent material 91 emitting blue light is included in the second molding part 82. The blue light emitted from the first fluorescent material 91 may be absorbed by the second fluorescent material 92 again to prevent light loss.

4 is a cross-sectional view showing a fourth embodiment of a light emitting device according to the present invention.

Referring to the drawings, the light emitting device includes a substrate 10 and a first electrode 20 and a second electrode 30 formed on the substrate 10. A first light emitting diode 50 emitting ultraviolet light on the first electrode 20 is mounted and excited by the ultraviolet light and emits blue light and green light having a peak wavelength longer than the excitation light. And second fluorescent materials 91 and 92 are disposed on the first light emitting diode 50.

The second light emitting diode 60 is mounted on the second electrode 30 and emits red light having a wavelength different from that emitted from the first and second fluorescent materials. This is almost the same as the configuration of the third embodiment, and detailed description thereof will be omitted.

In the light emitting device according to the present embodiment, the first molding part 81 including the first and second fluorescent materials 91 and 92 covers the first light emitting diode 50 emitting ultraviolet light. A second molding part 82 is formed to encapsulate the first molding part 81 and the second light emitting diode 60.

Accordingly, the red light emitted from the second LED 60 may not be emitted to the outside of the molding part by the first and second fluorescent materials 91 and 92 and may be prevented from disappearing.

5 is a cross-sectional view showing a fifth embodiment of a light emitting device according to the present invention.

Referring to the drawings, the light emitting device includes a substrate 10, first, second and third electrodes 20, 30, and 40 on the substrate 10, and ultraviolet light on the first electrode 20. A first light emitting diode (50) emitting light is mounted, excited by the ultraviolet light, and a fluorescent material (90) emitting green light having a peak wavelength longer than the excitation light. Is placed on top. This is almost the same as the configuration of the fourth embodiment, and detailed description thereof will be omitted.

In the present embodiment, the second light emitting diodes 61 and 62 emitting blue light and red light, which are wavelengths different from those emitted from the fluorescent material 90, are mounted on the second electrode 30 and the third electrode 40, respectively. do. As described above, unlike the embodiment using the fluorescent material as the blue light source, a light emitting diode having a narrow half-value width may be used to implement a light emitting device having excellent color reproducibility, which is particularly important in an LCD back light source.

Of course, the present invention is not limited thereto, and the molding part 80 including the fluorescent material 90 that emits green light may not only be the first light emitting diode 50 that emits ultraviolet light, but also the second light emission that emits blue light. The diode 61 may be formed to cover the diode 61. Accordingly, since the fluorescent material 90 emits light by blue light in addition to ultraviolet light, the excitation force may be improved to increase the green light emitted from the fluorescent material.

As described above, the present invention can be applied to products having various structures, and the technical gist of the present invention is not limited to the above-described embodiments, but various modifications and variations are possible.

For example, in the case of a lamp type light emitting device having a lead terminal, after mounting ultraviolet and red light emitting diodes on one side of the lead terminal, a first molding part containing a fluorescent material is formed to cover the ultraviolet light emitting diode as described above, and the ultraviolet and The light emitting device of the present invention may be manufactured by forming a second molding part encapsulating the red light emitting diode and one end of the lead terminal.

In addition, in the above-described embodiment, one blue and red LED chip is used, but a plurality of chips may be configured according to the purpose.

10: substrate 20, 30, 40: electrode
50: first light emitting diode 60: second light emitting diode
70: scattering agent 80: molding part
90 fluorescent material 100 wire

Claims (13)

A first light emitting diode emitting ultraviolet light;
A first fluorescent material disposed around the first light emitting diode;
A second fluorescent material disposed around the first light emitting diode;
A third fluorescent substance disposed around the first light emitting diode; And
At least one second light emitting diode,
The first fluorescent material is excited by the light emitted from the first light emitting diode, the peak wavelength of the light excited by the first fluorescent material is longer than the peak wavelength of the light emitted from the first light emitting diode,
The second fluorescent material is excited by light emitted from the first light emitting diode, and the peak wavelength of light excited by the second fluorescent material is excited by the first fluorescent material and the peak wavelength of light emitted from the first light emitting diode. Wavelength longer than the peak wavelength of the emitted light,
The third fluorescent material is excited by light emitted from the first light emitting diode, and the peak wavelength of the light excited by the third fluorescent material is excited by the peak wavelength of light emitted from the first light emitting diode, A wavelength longer than the peak wavelength of the emitted light and the peak wavelength of the light excited by the second fluorescent substance,
The light emitted from the second light emitting diode includes a peak wavelength of light emitted from the first light emitting diode, a peak wavelength of light excited by the first fluorescent material, a peak wavelength of light excited by the second fluorescent material, and a third fluorescent light. A light emitting device comprising light of a peak wavelength different from the peak wavelength of light excited by a substance. The method according to claim 1,
Further comprising a molding,
The first fluorescent material, the second fluorescent material and the third fluorescent material are disposed in the molding portion. The method according to claim 1,
A light emitting device further comprising a first molding portion and a second molding portion. The method according to claim 3,
At least one of the first fluorescent material, the second fluorescent material, and the third fluorescent material is disposed in the first molding part,
The other fluorescent material of the first fluorescent material, the second fluorescent material and the third fluorescent material not disposed in the first molding part is disposed in the second molding part. The method according to claim 3,
The hardness of the second molding portion is greater than the hardness of the first molding portion. The method according to claim 1,
The peak wavelength of the first phosphor is located in the range of 410 nm to 500 nm,
The peak wavelength of the second fluorescent material is located within the range of 500nm to 590nm. The method of claim 6,
The peak wavelength of the first light emitting diode is located in the range of 250nm to 410nm,
The peak wavelength of the second light emitting diode is located in the range of 590nm to 720nm. The method of claim 6,
The first fluorescent material comprises a silicate-based phosphor, the second fluorescent material comprises at least one of the germanium-based fluorescent material and the silicate-silicate fluorescent material. The method according to claim 1,
The peak wavelength of the first fluorescent material is located in the range of 440nm to 480nm,
The peak wavelength of the second fluorescent material is located in the range of 510nm to 560nm,
The peak wavelength of the third fluorescent material is located in the range of 560nm to 620nm. The method according to claim 9,
The peak wavelength of the first light emitting diode is located in the range of 250nm to 350nm,
The peak wavelength of the second light emitting diode is located within the range of 620nm to 660nm. The method of claim 10,
The first fluorescent material comprises a silicate-based phosphor, the second fluorescent material comprises at least one of the germanium-based fluorescent material and the silicate-silicate fluorescent material. The method according to claim 1,
A light emitting device in which no fluorescent material is disposed on at least one second light emitting diode. The method according to claim 1,
The first fluorescent material, the second fluorescent material and the third fluorescent material are sulfide-free fluorescent light emitting device.

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