CN101184824A - Light emitting device and phosphor of alkaline earth sulfide therefor - Google Patents
Light emitting device and phosphor of alkaline earth sulfide therefor Download PDFInfo
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- CN101184824A CN101184824A CNA2006800184901A CN200680018490A CN101184824A CN 101184824 A CN101184824 A CN 101184824A CN A2006800184901 A CNA2006800184901 A CN A2006800184901A CN 200680018490 A CN200680018490 A CN 200680018490A CN 101184824 A CN101184824 A CN 101184824A
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- light
- phosphorescent substance
- emitting device
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- alkaline earth
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/508—Wavelength conversion elements having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/52—Encapsulations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12041—LED
Abstract
The present invention relates to a light emitting device comprising a light emitting diode for emitting blue light or ultraviolet rays, and at least one orthosilicate based phosphor for emitting light in a green to yellow region and an alkaline earth metal sulfide based phosphor for emitting light in a red region which are installed above the light emitting diode. According to the light emitting device of the present invention, white light with a continuous spectrum ranging from green to red can be implemented such that more excellent color rendering and color reproducibility can be obtained. Therefore, the light emitting device of the present invention can used in an liquid crystal display backlight unit as well as a general lighting source and flash light source.
Description
Technical field
The present invention is relevant a kind of light-emitting device and employed phosphorescent substance thereof.In more detail, the present invention is relevant a kind of light-emitting device, and it is available as the back light unit of liquid-crystal display (LCD) because having good colorrendering quality; And a kind of because of its good color reproducibility is available as universal light source or flash of light (flash), reach phosphorescent substance based on alkaline earth sulfide for its use.
Background technology
Photodiode (LED) is a kind of opto-electronic conversion semiconducter device, and it is that N-type semiconductor is engaged with P-type semiconductor, and luminous by the combination again in electronics and hole.
Photodiode comprises the red LED of using GaAsP or fellow, uses GaP or fellow's green LED, uses the blue led of the two assorted structures of InGaN/AlGaN, and analogue.
This photodiode can be used in the manufacturing of multiple light-emitting device after packing.The light-emitting device that produces has low power consumption from passing through the photodiode of packing, and the long lifetime amplitude can be installed in the narrow space, and the characteristics such as strong resistance to vibrating.In the nearest several years,, also appear in the market as red, indigo plant or green LED, White LED except monochromatic color scheme LED.Along with White LED is applied in automobile and the illuminating product, expect that its demand can increase sharply.
In the technology of photodiode, realize that the method for white can be categorized into two types roughly.The first kind is a kind of method, and it is with red, indigo plant and green LED arrangement adjacent one another are and will be from the blend of colors of the light of individual device and embody white light.But, because indivedual light-emitting device has different heat or time response, have because environment for use causes tonal variation and can not obtain uniform light blended problem.Special person has color dot, or fellow's generation, and therefore, brightness is not high enough.In addition, operate the used circuit configuration complexity of indivedual photodiodes, and because the reason of packing configuration is difficult to obtain to mix according to the position of light-emitting device the top condition of three kinds of coloured light, so be difficult to realize perfect white.Moreover because its color rendering index (Color Rendering Index) is (CRI) low to about 40, it is inapplicable to be general light source or flash of light.Second kind is a kind of method, and it is that the color of the secondary light crossed through phosphor converted of color and the wavelength of the some of configuration phosphorescent substance and former light that this photodiode is sent on photodiode is mixed mutually with the embodiment white light.For example, photodiode to blue light-emitting sticks a part of blue light that can use this photodiode sends yellow-green colour or sodium yellow as excitation light source phosphorescent substance, and so yellowish green the or yellow light mix of sending via the blue light that this photodiode is sent and this phosphorescent substance can obtain white light.Perhaps, can on the photodiode of blue outside line, be coated with and to absorb the UV-light of being sent and send phosphorescent substance and obtain white from indigo plant to red visible light.
In order to obtain white light emission, use blue led and yellow phosphor such as YAG:Ce or (Ba, Sr, the Ca) that 450 to 470 nano wave lengths are arranged usually
2SiO
4Eu.Blue-light source can impel yellow phosphor to be excited, and sends gold-tinted then, and thereby can be via blue light and yellow light mix are obtained white light.
Summary of the invention
Technical problem
But, problem is this kind light-emitting device, and green and red spectrum has its lower colour rendering because of shortage, and it uses color rendering index (CRI) to be measured typically.That is, take a picture as general light source and special person in the situation of stroboscopic light sources of usefulness using combination gained by blue led and the yellow phosphor device that emits white light, the color twisted phenomena may take place, thereby can not show the primitive color of item sufficiently.
In addition, in using the situation of light-emitting device as LCD white light source backlight, it is narrow significantly that the color reproducible range that can show after the RGB spectral filter is crossed in the white light transmission can become.Consequently, restricted in making the more approaching technicolour realization of image.
Technology solves
The quasi-solution of the present invention problem in the aforementioned Prior Art of determining.In view of the above, a project of the present invention be to provide a kind of light-emitting device, wherein on turn blue coloured light or ultraviolet LED, install at least a phosphorescent substance based on ortho-silicate, it has green light to yellow district wavelength band in order to send, reach phosphorescent substance based on alkaline earth sulfide, it makes described light-emitting device to send white light with good colour rendering, thereby is available as general light source or flash of light in order to send the light with red color area wavelength band; And provide a kind of phosphorescent substance that is used for light-emitting device based on alkaline earth sulfide.
Another object of the present invention is the light-emitting device that a kind of LCD of being used for back light unit is provided, wherein its color reproducible range can improve the most about 40% with respect to being compared by the tradition that phosphorescent substance the constituted device that emits white light of blue led and jaundice coloured light.
According to the present invention is the one side of reaching these purposes, a kind of light-emitting device is proposed, it comprises photodiode, it is in order to send blue light, with at least a phosphorescent substance based on ortho-silicate, it is used to be emitted in green light to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used for being emitted in the light of red color area, and these phosphorescent substances are through being installed on the described photodiode.
Be preferably, have chemical formula based on the phosphorescent substance of ortho-silicate
a(M
IO)·b(M
IIO)·c(M
IIIA)·d(m
III 2O)·e(M
IV 2O
3)·f(M
V oO
p)·g(SiO
2)·h(M
VI xO
y)，
M wherein
IBe the element in the group that at least a Pb of being selected from and Cu formed; M
IIBe the element in the group that at least a Be of being selected from, Mg, Ca, Sr, Ba, Zn, Cd and Mn formed; M
IIIBe the element in the group that at least a Li of being selected from, Na, K, Rb, Cs, Au and Ag formed; M
IVBe the element in the group that at least a B of being selected from, Al, Ga and In formed; M
VBe the element in the group that at least a Ge of being selected from, V, Nd, Ta, W, Mo, Ti, Zr and Hf formed; M
VIBe the element in the group that at least a Bi of being selected from, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu formed; A is the element in the group that at least a F of being selected from, Cl, Br and I formed; A, b, c, d, e, f, g, h, o, p, x and y are set in 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≤5,1≤x≤2, reach in the scope of 1≤y≤5.
More preferably be, based on the phosphorescent substance of ortho-silicate have chemical formula ((Br, Sr, Ca)
1-x(Pb, Cu)
x)
2SiO
4: Eu, B; Wherein B is the element that is selected from the group that Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu form; X is in 0 to 1 the scope of being set in; And Eu and B are within 0 to 0.2 the scope of being set in.
Phosphorescent substance based on ortho-silicate can send the light with wavelength 505 nanometer to 605 nanometers according to the composition of phosphorescent substance.
The preferably, based on the phosphorescent substance of alkaline earth sulfide have chemical formula (Ca, Sr)
1-x-yEu
xC
y(S
1-zSe
z), wherein C is the element in the group that at least a Mn of being selected from and Pb formed; X is in 0.0005 to 0.1 the scope of being set in; Y is within 0 to 0.5 the scope of being set in; And z is within 0 to 1 the scope of being set in.
Better person, based on the phosphorescent substance of alkaline earth sulfide have chemical formula (Ca, Sr)
1-x-yEu
xPb
yS, wherein x is in 0.0005 to 0.01 the scope of being set in; And y is within 0 to 0.5 the scope of being set in.
Phosphorescent substance based on alkaline earth sulfide can send the light with wavelength 600 nanometer to 660 nanometers.
Be preferably, have chemical formula A based on the phosphorescent substance of alkaline earth sulfide
X-aEu
aGeS
z, wherein A is the element in the group that at least a Ca of being selected from and Sr formed; Z=x+2; X is in 2 to 5 the scope of being set in; And a/x is within 0.0005 to 0.02 the scope of being set in.
The phosphorescent substance based on ortho-silicate that is preferably the light that will be emitted in the green district is installed on the photodiode with the phosphorescent substance based on alkaline earth sulfide that is emitted in the light in the red color area.
Photodiode can send the light with wavelength 420 nanometer to 480 nanometers.
The preferably, light-emitting device can further comprise main body and in order to photodiode be installed in above the main body molding partly, wherein be through mixing and be distributed within the molding part based on the phosphorescent substance of ortho-silicate with based on the phosphorescent substance of alkaline earth sulfide.Herein, main body can be substrate, one in radiator element and the wire lead termination.
Light-emitting device can further comprise the diode of sending out UV-light, it is used to send ultraviolet ray, wherein excite and luminous based on the phosphorescent substance of ortho-silicate with based at least one light that diode sent that can be sent out UV-light in the phosphorescent substance of alkaline earth sulfide.
According to a further aspect of the invention, a kind of light-emitting device is proposed, it comprises photodiode, it is in order to send blue light and at least a phosphorescent substance based on ortho-silicate, and it is used to be emitted in green light to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used for being emitted in the light of red color area, and these phosphorescent substances are to be installed on the photodiode, can make its colour rendering be improved whereby and make light-emitting device be available as the degree of general light source or stroboscopic light sources.
Fork on the other hand according to the present invention, a kind of light-emitting device is proposed, it comprises photodiode, it is in order to send blue light and at least a phosphorescent substance based on ortho-silicate, and it is used to be emitted in green light to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used for being emitted in the light of red color area, and these phosphorescent substances are to be installed on the photodiode, can make its color reproduction scope be improved to whereby light-emitting device be can be used among the LCD back light unit.
According to the present invention again on the other hand, a kind of phosphorescent substance based on alkaline earth sulfide is proposed, its have chemical formula (Ca, Sr)
1-x-yEu
xC
y(s
1-zSe
z), wherein C is the element in the group that at least a Mn of being selected from and Pb formed; X is in 0.0005 to 0.1 the scope of being set in; Y is within 0 to 0.5 the scope of being set in; And z is within 0 to 1 the scope of being set in.
The preferably, based on the phosphorescent substance of alkaline earth sulfide have chemical formula (Ca, Sr)
1-x-yEu
xPb
yS, wherein x is in 0.0005 to 0.01 the scope of being set in; And y is within 0 to 0.5 the scope of being set in.
Favourable effect
According to the present invention, one light-emitting device comprises based on the phosphorescent substance of ortho-silicate and based on the phosphorescent substance of alkaline earth sulfide, makes to send green, Huang with very good colour rendering and reproducibility and light such as red under the exciting who is the light in the blue area, long wavelength ultraviolet zone.So, one item advantage is that light-emitting device of the present invention can be applicable to multiple Application Areas, the person that is available as the energy of the light in this long wavelength ultraviolet district and blue area wherein, such as the green that is used for ultraviolet light-emitting diode, redness and white luminous device, and be used for turquoise, pink and the white luminous device of blue LED.
In particular, to be distributed in together on the blue LED in order to the phosphorescent substance that the luminous at least a phosphorescent substance based on ortho-silicate that green light to yellow district wavelength band arranged reaches in order to the light that sends red wavelength band, can embody the white light of continuous spectrum from green to red and provide the white luminous device of better colour rendering based on alkaline earth sulfide.Have up to the white light of 90CRI at least because light-emitting device of the present invention can embody, so another advantage is that light-emitting device of the present invention is available as stroboscopic light sources and general light source.
In addition, light-emitting device of the present invention is available as the LCD back light with its good colorrendering quality.
Description of drawings
Fig. 1 is for showing the sectional view of patch-type of the present invention (Chip-type) light-emitting device.
Fig. 2 is for showing the sectional view of top of the present invention type (top-type) light-emitting device.
Fig. 3 is for showing the sectional view of lamp type of the present invention (lamp-type) light-emitting device.
Fig. 4 demonstrates the sectional view that the light-emitting device that comprises shell is arranged among the present invention.
Fig. 5 is a collection of illustrative plates, its demonstrate with light-emitting device of the present invention in order to ortho-silicate for the composition of phosphorescent substance on basis relevant disperse spectrum.
Fig. 6 is a collection of illustrative plates, its demonstrate with light-emitting device of the present invention in used alkaline earth sulfide for the composition of the phosphorescent substance on basis relevant disperse spectrum.
Fig. 7 is a collection of illustrative plates, and it demonstrates the spectrum of dispersing of light-emitting device of the present invention.
Fig. 8 is a collection of illustrative plates, and its light that demonstrates light-emitting device of the present invention is dispersed the transmissivity of spectrum and traditional LC D colour filter.
Embodiment
Implement best mode of the present invention
Hereinafter, be with reference to appended graphic detailed description light-emitting device of the present invention.But, the present invention is not limited by preferred embodiments described herein, but available multi-form enforcement.This preferred embodiments only provides to be used for making the present invention to be illustrated fully in this article and the scope of the invention conveyed to fully is familiar with this operator.In each accompanying drawing, similar elements is indicated with same reference numerals.
Light-emitting device of the present invention comprises at least a phosphorescent substance based on ortho-silicate, it is used to send the light with green wavelength band to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used to send the light with red wavelength band, makes to issue out green, yellow and the red light with very good colour rendering and reproducibility the exciting of light of long wavelength ultraviolet district and blue region.
Phosphorescent substance based on ortho-silicate has by the represented structure of chemical formula (1):
a(M
IO)·b(M
IIO)·c(M
IIIA)·d(M
III 2O)·e(M
IV 2O
3)·f(M
V oO
p)·g(SiO
2)·h(M
VI xO
y)
In chemical formula (1), M
IBe the element in the group that at least a Pb of being selected from and Cu formed; M
IIBe the element in the group that at least a Be of being selected from, Mg, Ca, Sr, Ba, Zn, Cd and Mn formed; M
IIIBe at least a Li, Na, K, the element in the group that Rb, Cs, Au and Ag formed of being selected from; M
IVBe the element in the group that at least a B of being selected from, Al, Ga and In formed; M
VBe the element in the group that at least a Ge of being selected from, V, Nd, Ta, W, Mo, Ti, Zr and Hf formed; M
VIBe the element in the group that at least a Bi of being selected from, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu formed; And A is the element in the group that at least a F of being selected from, Cl, Br and I formed.
In addition, in chemical formula (1), a, b, c, d, e, f, g, h, o, p, x and y are set in 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≤5,1≤x≤2, reach in the scope of 1≤y≤5.
Preferably, the phosphorescent substance based on ortho-silicate is expressed as following chemical formula (2):
((Br，Sr，Ca)
1-x(Pb，Cu)
x)
2SiO
4:Eu，B
In chemical formula (2), B is at least a element that is selected from the following group that constitutes: Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.In addition, x is in 0 to 1 the scope of being set in; And Eu and B are in 0 to 0.2 the scope of being set in.
Form based on the typical case of the phosphorescent substance of ortho-silicate and can be expressed as following chemical formula (3) to (5):
Pb
0.1Ba
0.95Sr
0.95SiO
4:Eu
Cu
0.05Sr
1.7Ca
0.25SiO
4:Eu
Formula 5
Cu
0.1Ba
0.1Sr
0.9Ga
0.9SiO
4:Eu
The represented phosphorescent substance of chemical formula (3) sends the light of wavelength 527 nanometers, and chemical formula (4) phosphorescent substance of being shown sends the light of wavelength 592 nanometers, and chemical formula (5) phosphorescent substance of being shown sends the light of wavelength 605 nanometers.So, can be controlled according to its element and composition from the light wavelength that phosphorescent substance was sent based on ortho-silicate.
In addition, the phosphorescent substance based on alkaline earth sulfide has the structure of being shown in the following chemical formula (6):
(Ca，Sr)
1-x-yEu
xC
y(S
1-zSe
z)
In chemical formula (6), C is the element in the group that at least a Mn of being selected from and Pb formed.In addition, x is in 0.0005 to 0.1 the scope of being set in, and y is in 0 to 0.5 the scope of being set in, and z is in 0 to 1 the scope of being set in.
The preferably has the structure of being shown based on the phosphorescent substance of alkaline earth sulfide in chemical formula (7):
(Ca，Sr)
1-x-yEu
xPb
yS
In chemical formula (7), x is in 0.0005 to 0.01 the scope of being set in, and y is in 0 to 0.5 the scope of being set in.
Phosphorescent substance institute tool typical case composition based on alkaline earth sulfide can be expressed as following chemical formula (8) to (10):
Ca
0.947Pb
0.05Eu
0.003S
Formula 9
Ca
0.447Sr
0.5Pb
0.05Eu
0.003S
Ca
0.897Pb
0.1Eu
0.003S
The represented phosphorescent substance of chemical formula (8) sends the light of wavelength 650 nanometers, and the represented phosphorescent substance of chemical formula (9) sends the light of wavelength 630 nanometers, and the represented phosphorescent substance of chemical formula (10) sends the light of wavelength 648 nanometers.So, can be controlled according to its element and composition from the light institute tool wavelength that the phosphorescent substance based on alkaline earth sulfide sends.
Via using aforementioned phosphorescent substance of the present invention can under the exciting of the light in long wavelength ultraviolet district and the blue area, embody better green, Huang and red light.In the situation of ultraviolet leds, aforementioned phosphorescent substance can be used dividually or together to embody shades of colour such as green, red and white.Perhaps, in the situation of blue led, aforementioned phosphorescent substance can be used dividually or together to embody shades of colour such as turquoise, pink and white.
Hereinafter, be with reference to the light-emitting device of appended graphic explanation aforementioned phosphorescent substance used according to the invention.
Fig. 1 is the sectional view that patch-type light-emitting device of the present invention is shown.
With reference to this figure, this light-emitting device comprises substrate 10, at this first electrode 30 that forms above substrate 10 and second electrode 35, is installed in the photodiode 20 on first electrode 30, and the used molding of sealed light emitting diode 20 partly 50.Molding partly distributing equably in 50 at least a based on ortho-silicate phosphorescent substance 60 and based on the phosphorescent substance 70 of alkaline earth sulfide.
The central area that photodiode 20 is installed in substrate 10 can form predetermined groove on every side.At this moment, the generation type of this groove can be and makes its sidewall tilt with predetermined gradient.Herein, because photodiode 20 is mounted on the lower surface of groove, therefore, has light that the sidewall surfaces of predetermined inclination can make photodiode 20 send and reflected the biglyyest and make its luminous efficiency increase for it.
In addition, the molding that is used for sealed light emitting diode 20 partly 50 is formed in above the substrate 10.As described above, molding partly be uniform-distribution with in 50 at least a based on ortho-silicate phosphorescent substance 60 and based on the phosphorescent substance 70 of alkaline earth sulfide.Molding partly 50 can use predetermined transparent epoxy resin and aforementioned phosphorescent substance 60 and 70 and form by the ejaculation program.Perhaps, available following manner forms molding partly 50: use mould separately pressurization or thermal treatment and produce then.Molding partly 50 can form different shape such as optical lens type, plate, and the surface on uneven type is arranged.
In this kind of the present invention light-emitting device, primary light is to send from photodiode 20, and makes phosphorescent substance 60 and 70 send secondary light, and respectively all with wavelength Conversion, feasible mixture by primary light and secondary light reveals the color in the desire spectral region.That is, send blue light and make that phosphorescent substance based on ortho-silicate sends green to gold-tinted and make phosphorescent substance send ruddiness from blue LED based on alkaline earth sulfide.So, a part of blue light, that is primary light, can with green, Huang and ruddiness, that is secondary light, mixture reveals white light.In view of the above, light-emitting device of the present invention can embody the white light that has from green to red continuous spectrum, makes its colour rendering obtain improvement.
Fig. 2 is the sectional view of top of the present invention type light-emitting device.
With reference to this figure, this light-emitting device comprises a substrate 10, is formed with first electrode 30 and second electrode 35 on substrate 10, and is installed in this photodiode 20 above first electrode 30.This configuration is almost identical with the patch-type photodiode, therefore, and with its detailed description of above replacement of reference Fig. 1.But, this top type light-emitting device comprises reverberator 40, and it is formed on the substrate 10 to contain this photodiode 20; And molding part 50, its central part that is filled in reverberator 40 is with protection photodiode 20.Concentrate ability for the brightness that improves light and light, the inner side-wall of containing the reverberator 40 of photodiode can be formed and have predetermined obliquity.This kind configuration can preferably be used for the light from photodiode 20 is given reflecting the biglyyest and improving luminous efficiency.
Molding partly be uniform-distribution with in 50 at least a based on ortho-silicate phosphorescent substance 60 and based on the phosphorescent substance 70 of alkaline earth sulfide.So, from the primary light of photodiode 20 with from mixing and embody color in desired spectral range based on the phosphorescent substance 60 of ortho-silicate or based on the secondary light that the phosphorescent substance 70 of alkaline earth sulfide respectively has a wavelength of changing.
Fig. 3 is the sectional view that demonstrates lamp type light-emitting device of the present invention.
With reference to this figure, this light-emitting device comprises first wire lead termination 90, and it is formed with reflection partly 45, and be separated by second wire lead termination 95 of predetermined spacing of first wire lead termination 90.Photodiode 20 is that the reflection that is installed in first wire lead termination 90 partly is electrically connected to second wire lead termination 95 on 45 and by electric wire 80.On photodiode 20, be formed with comprise based on ortho-silicate and based on the phosphorescent substance 60 and 70 of alkaline earth sulfide.Front end in first and second wire lead terminations 90 and 95 forms outside molding part 55 by mould.In molding a kind of at least phosphorescent substance 70 that reaches based on alkaline earth sulfide based on the phosphorescent substance 60 of ortho-silicate of uniform distribution in 50 partly, these can absorb and convert the light with individual wavelengths from the light of photodiode 20 and with the light that is absorbed to.Outside molding part 55 is made to promote the optical transmission rate from photodiode 20 by transparent epoxy resin.
Fig. 4 is for showing the sectional view of the light-emitting device that the present invention includes a shell.
With reference to this figure, light-emitting device comprises shell 100, and there are first and second electrodes 30 and 35 that form by perforation its both sides; Be installed in the interior substrate 10 of perforation of shell 100, and be installed in the photodiode 20 above the substrate 10.At this moment, substrate 10 can be formed with as radiator element with certain material that good heat conductivity is arranged, and the thermal output of photodiode 20 is more effectively discharged.Light-emitting device further comprises molding part 50, and it is in order to sealed light emitting diode 20.In addition, the aforesaid at least a phosphorescent substance 70 that reaches based on alkaline earth sulfide based on the phosphorescent substance 60 of ortho-silicate of uniform distribution in molding part 50.
First and second electrodes 30 and 35 are connected respectively to the anode and the cathode terminal of photodiode 20.Photodiode 20 is mounted on the substrate 10 and by electric wire 80 and is electrically connected to first or second electrode 30 or 35.
As mentioned above, the present invention can be applicable to have the object of various structures, and the technology of the present invention feature is not limited to above-mentioned specific examples, and is can be through modifying in every way or the changer.
Fig. 5 is a collection of illustrative plates, its demonstrate according in the light-emitting device of the present invention form the fixed spectrum of dispersing in order to ortho-silicate for the phosphorescent substance institute tool on basis.As shown in FIG., can be according to the concentration of the composition of main material and luminous central element and is controlled in the scope of 505 nanometer to 605 nanometers in the light wavelength peak that sends, and also shows the good spectrum of dispersing.
Fig. 6 is a collection of illustrative plates, its demonstrate according in the light-emitting device of the present invention in order to alkaline earth sulfide for the composition of the phosphorescent substance on basis fixed disperse spectrum.Person as shown in FIG., can be according to the concentration of the composition of main material and luminous central element and is controlled in the scope of 600 nanometer to 660 nanometers in the light wavelength peak that sends, and also shows the good spectrum of dispersing.
Fig. 7 is a collection of illustrative plates, and it demonstrates and uses blue light-emitting diode and the two kinds spectrum of dispersing based on the light-emitting device of the phosphorescent substance of ortho-silicate and a kind of phosphorescent substance based on alkaline earth sulfide.As aforementioned phosphorescent substance person, be to use to have (the Ba that disperses wavelength 515 nanometers
0.45Sr
0.45Pb
0.1)
2SiO
4: Eu has the (Sr that disperses wavelength 565 nanometers
0.795Ba
0.2Pb
0.005)
2SiO
4: Eu, and have the Ca that disperses wavelength 650 nanometers
0.897Pb
0.1Eu
0.003S.
With reference to this figure, primary light of sending from the blue light-emitting diode and two secondary light of sending via being excited from phosphorescent substance as can be seen by a part of primary light, that is green, yellow and red light are mixed mutually and are reflected white light.Colour rendering of the present invention in view of the above can emit white light with respect to the tradition of using blue light-emitting diode and yellow phosphor, and the device acquisition is further to be improved.
Fig. 8 is a collection of illustrative plates, its demonstrate use the blue light-emitting diode and a kind of based on ortho-silicate phosphorescent substance and a kind of light-emitting device of the present invention of the phosphorescent substance based on alkaline earth sulfide disperse spectrum, reach the transmissivity of traditional LC D colour filter.Relevant aforementioned phosphorescent substance can use (the Ba that disperses wavelength 515 nanometers
0.45Sr
0.45Pb
0.1)
2SiO
4: Eu and have the Ca that disperses wavelength 650 nanometers
0.897Pb
0.1Eu
0.003S.
With reference to this figure, as can be seen the primary light of sending from the blue light-emitting diode with from phosphorescent substance via being excited the secondary light of being sent by a part of primary light, that is green glow and ruddiness mix making and reflect white light mutually.In view of the above, color reproduction scope of the present invention can obtain improvement with respect to the tradition device that emits white light.
The present invention is illustrated with reference to the specific examples of preferred embodiments and multiple specific modification.But, be familiar with this operator and can understand, other particular embodiment that are different from top specific each specific examples of addressing are also included among the scope of the invention and the spirit.
For example, in specific examples of the present invention, addressed, when planning via diode that comprises blue light-emitting or UV-light and green when gold-tinted at least a realized light-emitting device based on the phosphorescent substance of ortho-silicate and in order to the phosphorescent substance based on alkaline earth sulfide that sends ruddiness on the diode of this blue light-emitting or UV-light in order to send, should based on phosphorescent substance of alkaline earth sulfide have chemical formula (Ca, Sr)
1-x-yEu
xC
y(S
1-zSe
z), wherein C is the element in the group that at least a Mn of being selected from and Pb constituted, and x is in 0.0005 to 0.1 the scope of being set in, and y is in 0 to 0.5 the scope of being set in, and z is in 0 to 1 the scope of being set in.
But, in modified specific examples, can have chemical formula A based on the phosphorescent substance of alkaline earth sulfide
X-aEu
aGeS
z, wherein A is the element in the group that at least a Ca of being selected from and Sr formed, z=x+2, x are in 2 to 5 the scope of being set in, and a/x is in 0.0005 to 0.02 the scope of being set in.
Claims (17)
1. light-emitting device, it comprises:
Photodiode, it is in order to send blue light; And
At least a phosphorescent substance based on ortho-silicate, it is used to be emitted in green light to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used for being emitted in the light of red color area, and these phosphorescent substances are to be installed on this photodiode.
2. according to the light-emitting device of claim 1, wherein should have chemical formula based on the phosphorescent substance of ortho-silicate
a(M
IO)·b(M
IIO)·c(M
IIIA)·d(M
III 2O)·e(M
IV 2O
3)·f(M
V oO
p)·g(SiO
2)·h(M
VI xO
y)，
M wherein
IBe the element in the group that at least a Pb of being selected from and Cu formed; M
IIBe the element in the group that at least a Be of being selected from, Mg, Ca, Sr, Ba, Zn, Cd and Mn formed; M
IIIBe the element in the group that at least a Li of being selected from, Na, K, Rb, Cs, Au and Ag formed; M
IVBe the element in the group that at least a B of being selected from, Al, Ga and In formed; M
VBe the element in the group that at least a Ge of being selected from, V, Nd, Ta, W, Mo, Ti, Zr and Hf formed; M
VIBe the element in the group that at least a Bi of being selected from, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu formed; A is the element in the group that at least a F of being selected from, Cl, Br and I formed; A, b, c, d, e, f, g, h, o, p, x and y are set in 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≤5,1≤x≤2, reach in the scope of 1≤y≤5.
3. according to the light-emitting device of claim 2, wherein should have chemical formula based on the phosphorescent substance of ortho-silicate
((Br, Sr, Ca)
1-x(Pb, Cu)
x)
2SiO
4: Eu, B; Wherein B is the element in the group that at least a Bi of being selected from, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu formed; X is in 0 to 1 the scope of being set in; And Eu and B are within 0 to 0.2 the scope of being set in.
4. according to the light-emitting device of claim 2, wherein should send light according to the composition of this phosphorescent substance based on the phosphorescent substance of ortho-silicate with wavelength 505 nanometer to 605 nanometers.
5. according to the light-emitting device of claim 1, wherein should have based on phosphorescent substance of alkaline earth sulfide chemical formula (Ca, Sr)
1-x-yEu
xC
y(S
1-zSe
z), wherein C is the element in the group that at least a Mn of being selected from and Pb formed; X is in 0.0005 to 0.1 the scope of being set in; Y is in 0 to 0.5 the scope of being set in; And z is in 0 to 1 the scope of being set in.
6. according to the light-emitting device of claim 5, wherein should have based on phosphorescent substance of alkaline earth sulfide chemical formula (Ca, Sr)
1-x-yEu
xPb
yS, wherein x is in 0.0005 to 0.01 the scope of being set in; And y is in 0 to 0.5 the scope of being set in.
7. according to the light-emitting device of claim 5, wherein should send light based on the phosphorescent substance of alkaline earth sulfide with wavelength 600 nanometer to 660 nanometers.
8. according to the light-emitting device of claim 1, wherein should have chemical formula A based on the phosphorescent substance of alkaline earth sulfide
X-aEu
aGeS
z, wherein A is the element in the group that at least a Ca of being selected from and Sr formed; Z=x+2; X is set in to 5 scope; And a/x is in 0.0005 to 0.02 the scope of being set in.
9. according to the light-emitting device of claim 1, wherein this at least a phosphorescent substance based on ortho-silicate is the light that sends in the green district.
10. according to the light-emitting device of claim 1, wherein this photodiode sends the light with wavelength 420 nanometer to 480 nanometers.
11. light-emitting device according to claim 1, it further comprises main body and in order to photodiode is installed in this molding part above main body, should be through mixing and being distributed within this molding part based on the phosphorescent substance of ortho-silicate and the phosphorescent substance that is somebody's turn to do based on alkaline earth sulfide wherein.
12. according to the light-emitting device of claim 11, wherein this main body is one in substrate, radiator element and the wire lead termination.
13. light-emitting device according to claim 1, it further comprises ultraviolet light-emitting diodes, it is used to send ultraviolet ray, wherein should be luminous with exciting based on the light that at least one meeting in the phosphorescent substance of alkaline earth sulfide is sent by this ultraviolet light-emitting diodes based on the phosphorescent substance of ortho-silicate.
14. a light-emitting device, it comprises:
Photodiode, it is in order to send blue light; And
At least a phosphorescent substance based on ortho-silicate, it is used to be emitted in green light to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used for being emitted in the light of red color area, these phosphorescent substances are to be installed on this photodiode, can make its colour rendering be improved whereby and make this light-emitting device be available as the degree of general light source or stroboscopic light sources.
15. a light-emitting device, it comprises:
Photodiode, it is in order to send blue light; And
At least a phosphorescent substance based on ortho-silicate, it is used to be emitted in green light to yellow region, and based on the phosphorescent substance of alkaline earth sulfide, it is used for being emitted in the light of red color area, these phosphorescent substances are to be installed on this photodiode, but the used degree of back light unit that can make its color reproduction scope be improved whereby to make this light-emitting device liquid crystal display.
16. the phosphorescent substance based on alkaline earth sulfide, it has chemical formula:
(Ca，Sr)
1-x-yEu
xC
y(S
1-zSe
z)，
Wherein C is the element in the group that at least a Mn of being selected from and Pb formed; X is in 0.0005 to 0.1 the scope of being set in; Y is in 0 to 0.5 the scope of being set in; And z is in 0 to 1 the scope of being set in.
17. according to the phosphorescent substance based on alkaline earth sulfide of claim 16, wherein this phosphorescent substance have chemical formula (Ca, Sr)
1-x-yEu
xPb
yS, wherein x is in 0.0005 to 0.01 the scope of being set in; And y is in 0 to 0.5 the scope of being set in.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050043785 | 2005-05-24 | ||
| KR1020050043785A KR100657137B1 (en) | 2005-05-24 | 2005-05-24 | White light emitting device having green phosphor of thiogallate and red phosphor of alkaline earth sulfide |
| KR1020050057892 | 2005-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101184824A true CN101184824A (en) | 2008-05-21 |
Family
ID=37707262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800184901A Pending CN101184824A (en) | 2005-05-24 | 2006-05-23 | Light emitting device and phosphor of alkaline earth sulfide therefor |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100657137B1 (en) |
| CN (1) | CN101184824A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012009845A1 (en) * | 2010-07-19 | 2012-01-26 | 海洋王照明科技股份有限公司 | Luminescent material and preparation method thereof |
| CN101635132B (en) * | 2008-07-25 | 2013-06-19 | 株式会社日本显示器西 | Display device, display method, and electronic device |
| CN103493223A (en) * | 2011-01-14 | 2014-01-01 | 渲染材料公司 | Carbonitride and carbidonitride phosphors and lighting devices using the same |
| CN109791967A (en) * | 2016-09-21 | 2019-05-21 | 伟视达电子工贸有限公司 | Phosphor device and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100634304B1 (en) * | 2004-09-30 | 2006-10-16 | 서울반도체 주식회사 | Fluorescent material and light emitting diode using the same |
-
2005
- 2005-05-24 KR KR1020050043785A patent/KR100657137B1/en active IP Right Grant
-
2006
- 2006-05-23 CN CNA2006800184901A patent/CN101184824A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635132B (en) * | 2008-07-25 | 2013-06-19 | 株式会社日本显示器西 | Display device, display method, and electronic device |
| WO2012009845A1 (en) * | 2010-07-19 | 2012-01-26 | 海洋王照明科技股份有限公司 | Luminescent material and preparation method thereof |
| US9034205B2 (en) | 2010-07-19 | 2015-05-19 | Ocean's King Lighting Science & Technology Co., Ltd. | Luminescent material and preparation method thereof |
| CN103493223A (en) * | 2011-01-14 | 2014-01-01 | 渲染材料公司 | Carbonitride and carbidonitride phosphors and lighting devices using the same |
| CN109791967A (en) * | 2016-09-21 | 2019-05-21 | 伟视达电子工贸有限公司 | Phosphor device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060121545A (en) | 2006-11-29 |
| KR100657137B1 (en) | 2006-12-13 |
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Application publication date: 20080521 |