CN100570795C - Light-emitting device - Google Patents
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- CN100570795C CN100570795C CNB2006800003164A CN200680000316A CN100570795C CN 100570795 C CN100570795 C CN 100570795C CN B2006800003164 A CNB2006800003164 A CN B2006800003164A CN 200680000316 A CN200680000316 A CN 200680000316A CN 100570795 C CN100570795 C CN 100570795C
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Abstract
Light-emitting device of the present invention possesses: the 1st insulator (4), and it is arranged on relative position; Luminous element (2), it is between the 1st insulator; The 2nd insulator (5), it is as the base station of the 1st insulator and this luminous element; Electrode (6), its part is relative with the 1st insulator or dispose on the 1st insulator; Other electrodes (10), it contacts with the 2nd insulator, and makes the 2nd insulator between arriving between this electrode; And light-transmitting substrate (8), its in a part across the 1st insulator, and in other parts across this luminous element, face mutually with the 2nd insulator, in the section that comprises the 1st insulator, the 2nd insulator, this luminous element and this light-transmitting substrate, extend and the 1st insulator to be set when contacting with this light-transmitting substrate, the relation of the area that the area in the zone that is surrounded by the 1st insulator, the 2nd insulator and this light-transmitting substrate and this luminous element are shared is set within the limits prescribed.
Description
Technical field
[0001]
The present invention relates to light-emitting device.Especially relate to simple in structure, easy to manufacture and constitute the light-emitting device of the unit picture element of high efficiency thin display.
Background technology
[0002]
Light-emitting device, wherein as the electroluminescent display (ELD) that shows that purposes is utilized, plasma display (PDP), electric field discharge displays (FED) etc. are researched and developed in every respect, and pursue high image quality, high efficiency display.With ELD and FED is example, and 1 pair of ELD record of non-patent literature is roughly as follows.1 example is, and is based on the structure that the fluorophor as luminescent layer applied electric field by insulating barrier, organic dispersed and film-type is known for everyone.Organic dispersed have the particle that will add the ZnS of impurity Cu etc. and be distributed in the organic substance, and form insulating barrier in the above, the structure of being seized on both sides by the arms by upper/lower electrode.Impurity forms pn knot in fluorophor particle, if apply electric field, by the high electric field that produces on the faying face, the electronics of emitting is accelerated after, combine again with the hole and luminous.Another example has, and will be configured in interelectrode structure as the Fluoropher thin films such as Mn doped ZnS of luminescent layer by insulator layer.Owing to there is insulator layer, can apply high electric field to luminescent layer, luminous at the ejected electron stimulated luminescence center that electric field is accelerated.On the other hand, FED is following mechanism: in vacuum tank, have by the electronics discharge device and with its facing to fluorophor, quicken to be released to electronics the vacuum from the electronics discharge device, be mapped on the luminescent coating and luminous.
[0003]
Because which device all is to emit with electronics to be luminous opportunity, low-voltage, the technology of ejected electron is very important expeditiously.As such technology, concern is emitted by the electronics of the polarization reversal generation of strong dielectric.For example, propose in the non-patent literature 2, shown in Figure 12 as it, to have be arranged on one on the face plane electrode (102) and be arranged on the PZT pottery (101) of the lattice-shaped electrode (103) on another face, in vacuum tank (106), pass through gate electrode (105) facing to platinum electrode (104), by applying pulse voltage between electrode, the motion of ejected electron.Reference as shown in above-mentioned figure meets 107 expression exhaust outlets.According to the record of this motion, the pressure in the container is 1.33Pa (10
-2Torr), in atmospheric pressure, do not discharge.
[0004]
To in vacuum tank, quicken by the electronics that the polarization reversal of strong dielectric is emitted, make luminescent coating luminous, perhaps utilize this luminous display, in patent documentation 1 and patent documentation 2, also described, but, basic formation is by substituting the platinum electrode of non-patent literature 2, as the formation of the electrode with luminescent coating, making luminescent coating luminous.
[0005]
On the other hand, the light-emitting device that the ejected electron that will be produced by the polarization reversal of strong dielectric uses in antivacuum, for example, open as electric light-emitting area light supply apparatus in patent documentation 3.This device, shown in Figure 13 as it, go up by bottom electrode (112) at substrate (115), strong dielectric film (111), upper electrode (113), current-carrying enhancement layer (118), luminescent layer (114), the order of transparency electrode (116) forms, and upper electrode has peristome (117).Applying voltage pulse by between counter-rotating lower electrode and upper electrode makes electronics be released to the current-carrying enhancement layer from the upper electrode peristome, and quickens by the positive voltage that transparency electrode is added, and the electronics limit is quickened, and it is luminous that the limit arrives luminescent layer.Put down in writing by current-carrying enhancement layer dielectric constant lowlyer, and had the situation that the semiconductor of the band gap that is not absorbed in the emission wavelength of emitting in the luminescent layer constitutes.This device can be thought a kind of ELD.In addition, disclose in patent documentation 4, seized on both sides by the arms the luminescent layer that the fluorophor that formed by sputter constitutes by the surface and the insulating barrier at the back side, applied in the formation of impulse electric field, an insulator is made of the strong dielectric film.
[0006]
In addition, by advising, in the simple formation shown in patent documentation 5, also adopt cheap plane device with the same applicant of the application.This light-emitting device is, the mode that contacts with the surface with porous material luminous element is discharged to 2 electrode application voltage of configuration, utilizes the ultraviolet ray by this discharge generation, the fluorophor particle in the excitation porous material luminous element and luminous.In addition, by open,, improve the plasma display of brightness as suppressing to misplace electricity with the same applicant of the application, shown in the patent documentation 6, be the display pannel of feature for highly different well purlin shapes at the line direction and the column direction of the spaced walls that forms discharge space.
Patent documentation 1: the spy opens flat 07-064490 communique;
Patent documentation 2: No. 5453661 specification of United States Patent (USP);
Patent documentation 3: the spy opens flat 06-283269 communique;
Patent documentation 4: the spy opens flat 08-083686 communique;
Patent documentation 5: the spy opens the 2004-200143 communique;
Patent documentation 6: the spy opens the 2005-011743 communique;
Non-patent literature 1: this positive Knitting work of pine, Electricity デ イ ス プ レ イ, オ one system society puts down on July 7th, 7, p.113-125;
Non-patent literature 2:Jun-ichi Asano etc., Field-Exited Electron Emissionfrom Ferroelectric Ceramic in Vacuum ' Japanese Journal of Applied PhysicsVol.31 Partl p.3098-3101, Sep/1992.
[0007]
In light-emitting device, comprise as the important elements of representing its superiority: the height of brightness, the stability of brightness, high efficiency, height becomes more meticulous, and durability also has, the possibility of slimming and big pictureization etc.With above-mentioned existing apparatus is reference, and aspect high efficiency and high such viewpoint that becomes more meticulous, the PDP present situation is to lack adaptability, in addition, in big pictureization or durability, the perhaps viewpoint aspect of the simplification of manufacturing process, still there is the problem of a lot of technology in ELD.
[0008]
Especially, if for carrying out the PDP of commodity development recently, need to have the problem of luminous efficiency difference before the light-emitting phosphor allowing through a lot of processes.This is caused by principle of luminosity.Specifically, at first, need apply voltage, cause plasma discharge xenon in the light-emitting device and neon etc.And, by the ultraviolet ray exited fluorophor that is coated on the light-emitting device inwall that this plasma discharge produces, produce red, green, blue light.Therefore, in PDP,, be difficult to obtain high luminous efficiency,, have the big problem of the electric power of consumption as giant display owing to have the problem of the internal that causes by the many principle of luminosity of the process before light-emitting phosphor.
[0009]
And in order to realize luminous among the PDP, cellular construction self is subjected to various restrictions.The sufficient space that for example, need be used for gas discharges such as xenon.In addition, thickness for luminous element also will fully comprise, ultraviolet ray is transformed to the luminescence center of visible light, and since with visible light in front side-draw go out, need thickness sufficient, but from can not too thick viewpoint in order to ensure sufficient discharge space, no matter blocked up film, still opposite thin excessively film is all bad, need be with THICKNESS CONTROL in suitable scope, and the degree of freedom in the technological design is little.The gas aspect need vacuumize light-emitting device the back and enclose gases such as xenon, because manufacturing equipment becomes large-scale equipment, has the high problem of the cost that becomes.In addition, for the above reasons, there is shock-resistant weak tendency.
[0010]
On the other hand, if consider from the angle of the formation of the light-emitting device that uses as display, the selection of the rerum natura of the spaced walls of formation unit, suitable relative position relation between this spaced walls and the electrode, the position of luminous element and the influence of thickness etc., for the suggestion of the new display of realizing substituting PDP etc., think to have the various technical tasks that solve.Therefore, before by the disclosed technology of same applicant be yet, and temporarily inspired it can be applied to possibility in the future display, concrete light-emitting device especially to the formation of unit, does not have any enlightenment.
[0011]
Summary of the invention
The present invention makes in view of such circumstances, its purpose is, is provided at when forming display and using luminous device structure, carries out technology controlling and process extremely easily, when improving processability, the productivity excellence, and, as the light-emitting device monomer, same degree such as PDP and various ELD or its above high brightness, and, having high efficiency, height becomes more meticulous and the light-emitting device of the possibility of big pictureization.
[0012]
Inventor's purpose is, after the various restrictions on the device that adopts in the PDP that removes in the past constitutes, still can realize high brightness and high efficiency light-emitting device, for this reason attentively research repeatedly.It found that, gets involved the luminous element that contains fluorophor particle between the selected insulator that is disposed on the insulated substrate of regulation, if at least 2 electrodes of assigned position configuration, apply voltage, even under atmospheric atmosphere, by changing the thickness of its luminous element, brightness changes.The inventor is further research repeatedly, find according to causing the luminance of luminous element different by the position of 2 electrodes and the dielectric constant of insulator etc., finally can effectively be used in display applications, think the suitable scope that can realize commodity production, finish the present invention.
[0013]
Light-emitting device of the present invention possesses: a plurality of the 1st insulators, and it is arranged on the relative position, comprises the luminous element of a plurality of fluorophor particles, and it is configured in the space between above-mentioned a plurality of the 1st insulator; The 2nd insulator, it plays the function as the base station of above-mentioned a plurality of the 1st insulators and above-mentioned luminous element; A plurality of electrodes, it forms electric field in above-mentioned space; Substrate, it is faced across above-mentioned luminous element and above-mentioned the 2nd insulator, on surface perpendicular to above-mentioned the 2nd insulator, and, in the section that cuts by the plane of above-mentioned space central authorities, extend when above-mentioned the 1st insulator being set arriving aforesaid substrate, the area of section A2 of above-mentioned luminous element is for by above-mentioned the 1st insulator, the ratio (A2/A1) of the area of section A1 of above-mentioned the 2nd insulator and aforesaid substrate area surrounded surpasses 0.4, less than 1, the superficial layer of above-mentioned luminous element or the integral body of above-mentioned luminous element are the porous material.This ratio (A2/A1) preferably surpasses 0.5.
[0014]
By adopting this formation, the THICKNESS CONTROL when applying luminous element easily, productivity, rate of finished products raising.Obtain the wide ranges of this thickness, in other words, it is wide to obtain process limitations, is to realize in light-emitting device in the past, for example, is and the diverse luminous mechanism of the PDP that needs the regulation discharge space, is that bygone is real.Promptly, in the present invention, be not only by the electronics of emitting and gas molecule or gas atom and impact ultraviolet ray exited luminous that the ultraviolet ray that produces forms from electrode, but propose to impact the fluorophor particle surface from the electrode ejected electron, luminescence center is by Electron Excitation and the motion of luminous compound mechanism.In addition, if adopt formation of the present invention, especially helping producing aspect the displacement inclosure that does not need rare gas generation resemble PDP.In addition, light-transmitting substrate among the present invention, lifting glass substrate typically is example, is not limited thereto.For example, the resin substrate of flexibilities such as propylene can not cause actual infringement to effect of the present invention yet, can be suitable for yet.
[0015]
No matter be which kind of above-mentioned light-emitting device, the 1st insulator and the 2nd insulator can be same materials.Because with its use sandblast processing etc., not as also can be used as the shaping of one thing, on the technology or all suitable on the intensity.In addition, if the dielectric constant of the 1st insulator and the 2nd insulator is more than 5, just can realize effect of the present invention.About dielectric constant, preferably in the dielectric constant of the 1st insulator and the 2nd insulator one be that another requires more than 5 more than 30.One that is more preferably in the 1st insulator and the 2nd insulator is more than 100, and another is more than 30.In addition, above-mentioned which light-emitting device all meets, and as the object lesson of the 1st insulator that is configured in relative position, the situation that a pair of the 1st insulator is a rectangular shape needless to say, as each execution mode, a pair of the 1st insulator also comprises the situation of the column structure of section trapezoidal shape.In addition, no matter in above-mentioned which light-emitting device, this light-transmitting substrate is meant, is arranged in the outermost substrate of light-emitting device, be not meaning for example, the light transmissive film or the layer that are provided with in the mode that covers this electrode.In addition, so-called " at least one facing to the 1st insulator; perhaps Pei Zhi at least one electrode ", being not only this electrode is configured on this light-transmitting substrate, a part contact with the 1st insulator or facing to situation, also comprise this electrode of configuration and be provided with on the 1st insulator, a part contacts with light-transmitting substrate or facing to the situation of position.
[0016]
In addition, as the 1st insulator and the 2nd insulator, suitable insulating properties metal oxide is preferably by glass material, and perhaps the composite material of glass material and metal oxide constitutes.This be since by with glass material hybrid shaping, the giant display process aspect is favourable making.As concrete material, be except glass material, use Y
2O
3, Li
2O, MgO, CaO, BaO, SrO, Al
2O
3, SiO
2, MgTiO
3, CaTiO
3, BaTiO
3, SrTiO
3, ZrO
2, TiO
2, B
2O
3, Pb (Zr, Ti) O
3, PbTiO
3In the material of at least a kind.No matter be above-mentioned which kind of insulator, all the mode that becomes more than the above-mentioned value with dielectric constant is selected mixing ratio, can realize effect of the present invention significantly.In addition, be pyrex etc. as above-mentioned glass material, glass transformation temperature is the low melting point glass of the what is called below 600 ℃, and is preferred aspect easy in manufacturing.
[0017]
In addition, preferred at least a portion covers at least one electrode that disposes facing to the 1st insulator or by insulating barrier.This is because favourable aspect the durability of electrode.In addition, this insulating barrier is preferably the layer that comprises alkaline-earth metals oxide.Comprise electrode by this layer and produced impact, improve durability as device integral body by electronics and ion.In particular, this insulating barrier is for comprising Y
2O
3, LiO
2, MgO, CaO, BaO, SrO, Al
2O
3, SiO
2, MgTiO
3, CaTiO
3, BaTiO
3, SrTiO
3, ZrO
2, TiO
2, B
2O
3, Pb (Zr, Ti) O
3, PbTiO
3In 1 or the layer of a plurality of materials.
[0018]
In addition, no matter be above-mentioned which kind of light-emitting device, preferably the superficial layer of luminous element is the porous material.Between 2 electrodes that exist across luminous element or between 2 electrodes that face side of luminous element exists, when applying the voltage of regulation, produce the so-called creeping discharge (creepingdischarge) that electronics flows through luminous element.Wherein, " creeping discharge " is called as " surface discharge (Surface discharge) " sometimes, and be different with " face discharge (Surface discharge) " in the PDP technical field." face discharge " in the PDP technical field and means that the discharge that produces is relative between the electrode that is arranged on the front panel, the creeping discharge in the present specification is the discharge that produces in the inside of the superficial layer of luminous element or porous material luminous element.
[0019]
If the superficial layer of luminous element is the porous material, therefore owing to produce the creeping discharge continuous discharge of avalanche, brightness stability.And if this luminous element integral body is the porous material, the surface of porous material luminous element is not only in creeping discharge, also produces in inside, because the luminescence center that fluorophor particle is comprised is luminous expeditiously, more satisfactory.And, as the form of this fluorophor particle, for example can list, spherical, needle-like, whisker shape (whisker), tabular.In any case, powder forms this luminous element if solidify, and as final form, has the advantage of easy formation porous material state.
[0020]
In addition, no matter be above-mentioned which kind of light-emitting device, luminous element is faced mutually with the 1st insulator at least a portion, perhaps the configuration at least one this electrode between in gas, this gas preferably is made of the gas that comprises oxygen or nitrogen at least.Even owing to comprise oxygen or nitrogen, also do not hinder luminous, in fact gas displacement is optional, has the easy to manufacture of display and can shorten the advantage of manufacturing time.In addition, this gas, for comprising the gas of oxygen or nitrogen at least, it is more than 1% that the most aerobic and nitrogen accounts for whole volume ratio.Even comprise the gas of 1% above oxygen and nitrogen, it is luminous that light-emitting device of the present invention can not damage brightness ground yet.And this gas comprises oxygen or nitrogen at least, and xenon to account for whole volume ratio be mist below 2%.Even xenon is the gas below 2%, can not damage effect of the present invention yet, can be luminous.Like this, light-emitting device of the present invention, carrying out needn't carrying out Qi Ti Zhi Change by the sealing device resemble PDP aspect the Qi Ti Zhi Change, in the manufacturing of display, the tight management of undesirable gas, and have the advantage that can shorten manufacturing time.And, do not hinder and in discharge gas, use rare gas.Reducing aspect the discharge voltage, can utilize rare gas.In addition, the pressure about above-mentioned gas is preferably 5 * 10
3Pa above 9 * 10
4Below the pa.
[0021]
In preferred forms, above-mentioned a plurality of the 1st insulators all have separately, from above-mentioned the 2nd insulator to the outstanding timber structure of aforesaid substrate.
[0022]
In preferred forms, above-mentioned a plurality of the 1st insulators between above-mentioned the 2nd insulator and aforesaid substrate, constitute the spaced walls of separating luminous a plurality of unit separately.
[0023]
In preferred forms, between above-mentioned spaced walls and aforesaid substrate, the gap is set.
[0024]
By other light-emitting devices of the present invention is to possess: at least one side has a pair of substrate of light transmission; Clipped at each self luminous a plurality of unit by above-mentioned a pair of substrate; Each above-mentioned a plurality of unit is applied the light-emitting device of the electrode structure of voltage, each unit has emitter and the gas blanket that comprises fluorophor, when above-mentioned electrode structure is applied voltage, in the above-mentioned gas layer, produce in the discharge, make electron bombardment to above-mentioned fluorophor, produce luminous by electron excitation.
[0025]
In preferred forms, the volume ratio of the above-mentioned gas layer in each unit and the total volume of above-mentioned luminous element and above-mentioned luminous element greater than 0.4 less than 1.
[0026]
In preferred forms, the average thickness of the above-mentioned gas layer in each unit is littler than the average thickness of above-mentioned luminous element.
[0027]
In light-emitting device of the present invention, owing to possess with gas blanket and compare, the luminous element that relative volume ratio is big on the luminous basis that is formed by the radiation of gas blanket discharge generation, also can access the luminous of the creeping discharge that utilizes luminous element, raising brightness.In addition, by the present invention, increased the limit at luminous element thickness dispersiveness, the discharging condition restriction of gas blanket has also been relaxed, can utilize the thick-film technique technology to make luminous element, gas blanket also can be made of atmosphere.
[0028]
Therefore, by the present invention, manufacturing process becomes simply, has improved productivity, and cheap, high-quality display unit can be provided.Light-emitting device of the present invention, equal degree such as realization and PDP and ELD or its above high brightness expeditiously, and, can slimming, big pictureization and height become more meticulous.
Description of drawings:
[0029]
Fig. 1 is this stereogram of implementing the light-emitting device in the 1st mode.
Fig. 2 is this key diagram of implementing the manufacturing process of the light-emitting device in the 1st mode.
Fig. 3 is this key diagram of implementing the manufacturing process of the light-emitting device in the 1st mode.
Fig. 4 is this key diagram of implementing the manufacturing process of the light-emitting device in the 1st mode.
Fig. 5 is this key diagram of implementing the manufacturing process of the light-emitting device in the 1st mode.
Fig. 6 is this profile of implementing the light-emitting device in the 2nd mode.
Fig. 7 is this profile of implementing the light-emitting device in the 3rd mode.
Fig. 8 is this profile of implementing the light-emitting device in the 4th mode.
Fig. 9 A is the profile of B-B direction among Fig. 1.
Fig. 9 B is the profile of B-B direction among Fig. 1.
Figure 10 is the profile of A-A direction among Fig. 1.
Figure 11 is this vertical view of implementing the light-emitting device in the 1st mode.
Figure 12 is the profile of light-emitting component in the non-patent literature 2 of example in the past.
Figure 13 is the explanation of profile symbol of the light-emitting component in the patent documentation 3 of example in the past.
[0030]
Among the figure: 1-light-emitting device, 2-contain the luminous element of fluorophor particle, 4-the 1st insulator, 5-the 2nd insulator, 6-the 1st electrode, 7-the 2nd electrode, 8-light-transmitting substrate, 9-gas blanket, 10-the 3rd electrode, 11-insulating barrier, laminar substrate under the 20-
Embodiment
[0031]
Below, with reference to the accompanying drawings, the specific embodiment of the present invention is described.At first, the limit is with reference to Fig. 1～Fig. 5, and the limit describes the luminous device structure in the 1st mode of this enforcement.
[0032]
Fig. 1 is the stereogram of the light-emitting device in the 1st mode of this enforcement, and Fig. 2～Fig. 5 is the key diagram of the manufacturing process of the light-emitting device in the 1st mode of this enforcement.In these figure, 1 is light-emitting device, and 2 for containing the luminous element of fluorophor particle, and 4 is the 1st insulator, 5 is the 2nd insulator, 6 is the 1st electrode (the 1st front face side electrode), and 7 is the 2nd electrode (the 2nd front face side electrode), and 8 is light-transmitting substrate, 9 is gas blanket, 10 is the 3rd electrode (rear side electrode), and 20 are following laminar substrate.Figure 10 is the A-A profile among Fig. 1, especially for clearly, is configured in the figure of the position relation of each electrode 6,7 on the light-transmitting substrate 8 and the 1st insulator 4 and gas blanket 9.Figure 11 is the vertical view of the light-emitting device in the 1st mode of this enforcement.And, among Fig. 1, for convenience, only represent the part of light-transmitting substrate 8.In addition, for each electrode 6,7, only to 2 row of luminescence unit, represent to understand other modes of installing the relation of member of formation from the drawing front face side.But because section is between the 1st electrode 6 and the 2nd electrode 7,6 one at the 1st electrode of the row of drawing hand front side also be cannot see.
[0033]
As shown in Figure 2,, burn the Ag cream of 5 μ m～30 μ m thickness on the face of the following laminar substrate 20 that the composite material of ceramic material or glass material and ceramic material forms, the 3rd electrode 10 is formed the shape of regulation by glass material.Bonding, forming the 2nd insulator 5 on laminar substrate 20 and the 3rd electrode 10 down as shown in Figure 3.Specifically, be adjusted at respect to 40wt%BaTiO
3Mixed in the powder and mixed 40wt% α-terpineol (α-テ レ ピ ネ オ one Le) 40wt% in the powder of 15wt% glass powder, the cream of ethyl cellulose 5wt%, after the silk screen printing, in atmosphere, by heat-treating with 400 ℃～600 ℃, form 5 layers of the 2nd insulators of 10 μ m～1000 μ m thickness.And, also the sheet lamination that has printed insulator life thin slice and electrode can descended on the laminar substrate 20, the mode on every side that covers the 3rd electrode 10 with the 2nd insulator disposes.
[0034]
In the present embodiment, used BaTiO as the 2nd insulator 5
3Even use SrTiO
3, CaTiO
3, MgTiO
3, Pb (Zr, Ti) O, PbTiO
3Also can access the same effect Deng insulator.In addition, even use Al
2O
3, MgO, ZrO
2Also can access the same effect Deng insulator, but compare with the big insulator of dielectric constant, brightness dies down., this can improve, improve capacity by the thickness of attenuate insulator.In addition, can be by sputter, CVD, evaporation, films such as sol-gel form technology and form insulating barrier.
[0035]
And as the 2nd insulator 5, when using sintered body, it can be used for down laminar substrate 20, and also it doesn't matter not use this time laminar substrate 20.The thickness of this insulator 5 is extremely different when being formed by thick-film technique when using sintered body.In fact, the capacitive component of Xu Yaoing can be by the adjustment that concerns than dielectric constant.In addition, no matter whether with the situation of the 2nd insulator 5 dual-purposes, the 3rd electrode 10 therewith the lower floor's substrate-side in this insulator the face contact or, the 3rd electrode 10 disposes in the mode that covers this insulator 5, can play effect of the present invention.
[0036]
Bonding, on the 2nd insulator 5, form the 1st insulator 4 in mutual relative mode.Specifically, by to 50wt% pottery (SrTiO for example
3) and glass (weight ratio is 1: 1) confuse particle, add the pattern that the mixing cream silk screen printing of 50wt% α-terpineol becomes to stipulate, with 400 ℃～580 ℃,, form the 1st insulator 4 of about as shown in Figure 43 μ m～500 μ m thickness through 2 hours～5 hours heat treatment for solidification.And, also can be by same material (for example, BaTiO
3) formation the 1st insulator 4 and the 2nd insulator 5.If same material and since at mark behind the zone of regulation, by sandblast processing, once form the 1st insulator 4 and the 2nd insulator 5, can help cutting down manufacturing process.
[0037]
Each of the 1st insulator 4 as shown in Figure 1, has the timber structure of giving prominence to light-transmitting substrate 8 from the 2nd insulator 5, between the 2nd insulator 5 and light-transmitting substrate 8, constitutes the spaced walls of each self luminous a plurality of unit.Play upper end, do not need to contact with light-transmitting substrate 8 as the 1st insulator 4 of such spaced walls function.The height of the 1st insulator 4 between the 1st insulator 4 and light-transmitting substrate 8, also can be set at the size in the gap of formation needs.When the area of light-transmitting substrate 8 maximized, the height of the 1st insulator 4 was at random in face, even contact with light-transmitting substrate 8 with the 1st insulator 4 in certain position, in other positions, did not contact sometimes, and produced the gap.Such situation can improve the possibility of each cell discharge state variation.In order to improve the inner evenness of discharge condition,, preferably, design the height of relative reduction the 1st insulator 4 between the 1st insulator 4 and light-transmitting substrate 8, to produce the mode in gap no matter in which position.But,, can be that relative highland, specific region forms only also, so that contact with the part of light-transmitting substrate 8 at the 1st insulator 4 for the flatness of the light-transmitting substrate 8 of keeping easy warpage.
[0038]
And the 1st insulator 4 as shown in Figure 1 is on the 2nd insulator 5, along row and column shape direction trend, well type cell array.But the structure of the 1st insulator in the present invention is not limited to such situation, also can have the structure that resembles the striated pattern or crawl (bending) pattern.In addition, the shape of bottom surface, unit be not limited to rectangle, the shape that also can have polygonal such as hexagon or surround by curve.
[0039]
Then, as shown in Figure 5, on the 2nd insulator 5, will contain the luminous element 2 of fluorophor particle, form stratiform by silk screen print method.Will be to the 50wt% fluorophor particle, mixing 45wt% α-terpineol, the cream of 5wt% ethyl cellulose is fabricated into respectively on each luminous element, and by silk screen printing is afterwards through repeatedly drying process repeatedly to it, adjusting becomes the following luminous element 2 of the above 500 μ m of thickness 3 μ m as shown in Figure 5.And, can use ZnS:Ag (indigo plant), ZnSiO as fluorophor particle
5: Ce
3+(indigo plant), ZnS:Cu, Cl (green) 5, (Y, Gd) BO
3: Tb
3+(green), Y
2O
2S:Eu
3+The fluorophor that CRT such as (red) uses, perhaps, BaMgAlO
10: Eu
2+(indigo plant), (Sr, Ba, Ca, Mg)
10(PO
4)
6Cl
2: Eu
2+(indigo plant), Zn
2SiO
4: Mn
2+(green), SrAl
14O
25: Eu
2+(green), LaPO
4: Ce
3+, Tb
3+(bluish-green), CeMgAl
10O
19: Tb
3+(green), 3.5MgO0.5MgF
2GeO
2: Mn
4+(red), YBO
3: Eu
3+The inorganic compound of the fluorophor that lamps such as (red) is used.
[0040]
Wherein, the above-mentioned fluorophor particle of the layer lining surface that can constitute by metal oxides such as MgO.Thus, have and to produce creeping discharge expeditiously, and can protect fluorophor by the such advantage of bombardment by ions.For example, form following the carrying out of method of MgO layer on the fluorophor particle surface.At first, at Mg (OC as alcoxide
2H
5)
2Mix by CH while stirring carefully under the room temperature in the powder (1 mol ratio)
3COOH (10 mol ratio), H
2O (50 mol ratio) and C
2H
5The solution that OH (50 mol ratio) constitutes is made almost transparent sol-gel solution.Stir on one side this fluorophor particle (2 mol ratio) therein, in this sol-gel solution add and on a small quantity mix on one side.After this operation continued to carry out one day, the centrifugation mixed solution was put into the powder taking-up in the ceramic vessel, with 150 ℃ of dry diel dryings.Bonding, by with dried powder in atmosphere with 400 ℃～600 ℃, pre-burning in 2 hours～5 hours can form the uniform layer that is made of MgO on fluorophor particle surface.
[0041]
[0042]
As described above, behind the printing luminous element 2,, under 600 ℃ of degree,, form the luminous element 2 of the above following thickness of 500 μ m of 3 μ m through heat treatment in 10 minutes～60 minutes by in atmosphere.And in the present embodiment, the formation of luminous element 2 is carried out after forming the 1st insulator 4, also can form luminous element 2 earlier.
[0043]
In addition, above-mentioned paste adds organic bond and organic solvent modulation in fluorophor particle, even use the paste that adds aqueous solution of silica gel in fluorophor particle, also can access the same effect.And one side when adding aqueous solution of silica gel in the operation that forms luminous element, owing to do not need to heat-treat, can suppress the oxidation of fluorophor.
[0044]
As mentioned above, after forming the 1st insulator 4, if by light-transmitting substrates such as the glass plate 8 covering luminous elements 2 that the position that contacts the configuration of the 1st insulator 4 at the 1st electrode 6 that is made of Ag with the 2nd electrode 7 at least a portion physics forms in advance, can access the light-emitting device 1 in the 1st mode of this enforcement as shown in Figure 1.At this moment, to produce the mode in the gap that is made of gas blanket 9 at least between luminous element 2 and the 1st electrode 6 or luminous element 2 and the 2nd electrode 7, use silica gel, waterglass or resin etc. stick on light-transmitting substrate 8 on the 1st insulator 4.
[0045]
If the distance that gas blanket 9 exists between luminous element 2 and the 1st electrode 6 or luminous element 2 and the 2nd electrode 7 is that also it doesn't matter more than the mean free path of gas molecule at least.Therefore, the thickness of luminous element 2, if consider manufacturing process, in fact the following scope of 500 μ m is suitable more than 20 μ m, especially is preferably in to surpass 30 μ m, the following scope of 250 μ m.Discharge ionization voltage in this light-emitting device, owing to be subjected to the distance affects of each electrode 6,7 and luminous element 2, if the above-mentioned upper limit, on manufacturing process, the control of its distance becomes difficulty, and then it is big that the fluctuating of discharge ionization voltage becomes.
[0046]
And,,, also can use the light-transmitting substrate of implementing the ITO distribution as substituting of Ag for the light-transmitting substrate 8 that has as the transparency electrode that constitutes by Ag of the 1st electrode 6 and the 2nd electrode 7.In addition, ITO and Ag relatively owing to be suitable high resistance, should be noted that the rising of luminous voltage, heating, the generation of broken string etc.Also can use gold, copper, titanium, aluminium etc. as other electrode materials.
[0047]
As mentioned above, the light-emitting device 1 in the 1st mode of this enforcement can be got at,, the light-emitting device 1 in the 2nd mode of this enforcement as shown in Figure 6 can be accessed if the electrode on the light-transmitting substrate 8 is only formed light-emitting devices as the 1st electrode 6.In addition, coating dielectric thick film cream on the light-transmitting substrate 8 that forms the 1st electrode 6 or the 2nd electrode 7, heat treatment in atmosphere forms dielectric layer.And, if form the MgO layer by the MgO sputter, the insulating barrier 11 of lining the 1st electrode 6 or the 2nd electrode 7 being set on this dielectric layer upper strata, can access as separately light-emitting device 1 in the 3rd and the 4th mode of Fig. 7 or this enforcement shown in Figure 8.And,, also can apply the paste that mixes MgO powder (10wt ratio) in this dielectric thick film cream (90wt ratio), in atmosphere, with 500 ℃～600 ℃ sintering as the formation method of insulating barrier 11.In addition, the thickness of this insulating barrier 11 is below the above 30 μ m of 0.1 μ m.This insulating barrier 11 has been as the diaphragm effect of electrode discharge.And, these insulating barrier 11 less thaies 0.1 μ m, each electrode 6,7 is cut down by discharge, and the danger that deterioration is carried out increases, if surpass 30 μ m, discharge voltage increases, and involves the reduction of luminous efficiency.
[0048]
But, in each execution mode, when forming luminous element 2, will be as the fluorophor particle of powder as substrate, as required, utilize adding organic bond and organic solvent etc., the reagent of livering, by material and the heat-treat condition of adjusting these, can form porous material shape luminous element 2 as final form.Specifically, for heat-treat condition,, when using stable on heating ceramic wafer, can implement heat treatment with the wide temperature range of 400 ℃～600 ℃ of comparisons as following laminar substrate 20.And, when adding livering such as above-mentioned organic bond and organic solvent, need in atmosphere, carry out high-temperature heat treatment, have the problem that causes the light characteristic variation that produces by the fluorophor particle oxidation etc. easily.Specifically, for example pass through BaMgAl
10O
17: Eu
2+Become the Eu of luminescence center
2+Send blue light.But the oxidation by in the heat treatment becomes Eu
3+The time, send red light.Therefore, as luminous element 2, substitute organic bond system, use the paste of the aqueous solution of silica gel that adds inorganic bond, by with 120 ℃～150 ℃ dryings, this light characteristic and economic viewpoint see it is favourable.And in each execution mode, the porosity of luminous element 2 is more than 10%.Optimum value is more than 30% below 70%.During porosity less than 10%, that is, can not be called the porous material if become, luminescence phenomenon self is not had big influence, but hinder the result of continuation of the creeping discharge of luminous element 2 inside, luminous efficiency occurs causing, compare the problem of reduction with the situation of porous material state.
[0049]
Then, on one side with reference to Fig. 1, the luminous mechanism to this light-emitting device 1 describes on one side.In order to drive light-emitting device 1 shown in Figure 1, between the 1st electrode 6 and the 2nd electrode 7, apply AC field.The pass of the capacitive component size in each execution mode is the 1st insulator 4 or the 2nd insulator 5＞luminous element 2＞gas blanket 9.Therefore, when this light-emitting device is applied electric field, be applied to the magnitude of voltage in each layer, because reciprocal proportional with electric capacity roughly becomes the 1st insulator 4 or the 2nd insulator 5＜luminous element 2＜gas blanket 9.Therefore, the luminous mechanism of this light-emitting device 1 thinks as follows.At first, between the 1st electrode 6 and the 2nd electrode 7, apply electric field.At this moment,, apply the above electric field of insulation breakdown voltage, produce insulation breakdown and discharge by in gas blanket 9.Wherein, discharge is at the electrode of cathode side, and place, the contact of gas blanket 9 and the 1st insulator 4 produces, and emits a large amount of electronics by the electrode of cathode side.Then, the electronics of emitting in gas blanket 9 with atmosphere in oxygen atom and collision such as nitrogen-atoms, the ultraviolet ray that produces wavelength 300nm～430nm.In addition, because capacitive component and dielectric constant are proportional, the ratio of the electronics that moves along the surface of low the 1st insulator 4 of resistance and the 2nd insulator 5 increases.Its result also increases in these luminous element 2 ratios surperficial or the inner electronics that moves, and the electronics of emitting is also collision on luminous element 2.This electronics is accelerated by electric field, produces the ultraviolet while, a part and fluorophor particle collision, stimulated luminescence center.And this luminous element 2 utilizes its space for the porous material is, creeping discharge is repeatedly further quickened to produce the ultraviolet while, a part and fluorophor particle collision, stimulated luminescence center.Then, electronics is absorbed in anode side electrode.Think as mentioned above, luminous owing to ultraviolet ray excited and electron excitation produce simultaneously.And by the 3rd electrode 10 is applied AC field, the control electric field can be controlled the electron number that collides on discharge ionization voltage value and the luminous element 2 etc.
[0050]
As other execution modes, on one side with reference to Fig. 6 and Fig. 8, the light-emitting device 1 that only disposes the 1st electrode 6 and the 3rd electrode 10 on one side describes.And, except being configured to of electrode, with above-mentioned execution mode the same terms, form light-emitting device.For driven for emitting lights device 1, when between the 1st electrode 6 and the 3rd electrode 10, applying AC field, by in gas blanket 9, applying the electric field more than the insulation breakdown voltage, produce insulation breakdown and discharge.Wherein, at the 1st electrode 6, place, the contact of gas blanket 9 and the 1st insulator 4 begins discharge, by the 1st electrode 6 ejected electrons.Then oxygen atom and the collision such as nitrogen-atoms of the electronics of being emitted in gas blanket 9 and atmosphere, the ultraviolet ray that produces wavelength 300nm～430nm.In addition, because the 1st electrode 6 and the 3rd electrode 10 by luminous element 2 configurations, also increase in these luminous element 2 ratios surperficial or the inner electronics that moves, the electronics of emitting is also with luminous element 2 collisions.This electronics quickens by electric field, produces the ultraviolet while, a part and fluorophor particle collision, stimulated luminescence center.And, when this luminous element is the porous material, utilize its space, creeping discharge repeatedly, the ratio at stimulated luminescence center increases.Then, electronics is absorbed by the 3rd electrode 10.Think that as mentioned above ultraviolet ray excited and electron excitation produces and luminous simultaneously.
[0051]
And, become square wave by the waveform that applies AC field by sine wave or Sawtooth waves, to listen in addition the tens of Hz of frequency layer were brought up to thousands of Hz, emitting of electronics becomes very fierce, and brightness improves.
[0052]
In the present invention, the average thickness for the gas blanket 9 in each unit increases relatively by the average thickness with luminous element 2, improves brightness with different luminous mechanisms with PDP.In other words, among the present invention, be set at the value that surpasses 0.5 less than 1 with respect to the volume ratio of the luminous element 2 of the total volume of gas blanket 9 in each unit and luminous element 2.If with cross sectional illustration shown in Figure 6 its, become as follows.
[0053]
Promptly, for example on surface perpendicular to the 2nd insulator 5, and, in the section that cuts by plane through the central authorities of unitary space, the 1st insulator 4 is extended when reaching light-transmitting substrate 8, the area in the zone that will be surrounded by the 1st insulator 4, the 2 insulators 5 and light-transmitting substrate 8 is as " A1 ", and the area of luminous element 2 is as " A2 ".At this moment, in the present invention, ratio (A2/A1) is set in the scope (preferably surpassing 0.5 less than 1) that surpasses 0.4 less than 1.Below, the reason that ratio (A2/A1) is set in such scope is described.
[0054]
In each execution mode, change the ratio (A2/A1) of the area A 1 shared with respect to the luminous element 2 of the area A 2 in the zone that surrounds by the 1st insulator 4, the 2 insulators 5 and light-transmitting substrate 8, confirmed luminous situation.And light-transmitting substrate 8 is meant and is positioned at outermost substrate, is not for example to mean, light transmissive film that is provided with in the mode that covers this each electrode 6,7 or layer.Specifically, prepare to make the paste that contains above-mentioned fluorophor particle, in 1 light-emitting device by silk screen print method, area for the regulation section of luminous element becomes 3%, 5%, 10% than (A2/A1), 20%, 35%, 40%, 55%, 65%, 75%, 85% and 95% mode, solid luminous body 2 is to the brightness of each investigation by following condition generation.
[0055]
So that form the 1st insulator 4 in the line direction mode different with the column direction height, at this moment, the side's that the 1st insulator 4 is low height is as 100 μ m.In luminous element 2, ratio (A2/A1) is 3%, 5% and 10% o'clock (situation shown in Fig. 9 A), for example uses, and wavelength 200nm～400nm is had the BaMgAl of big excitation spectrum
10O
17: Eu
2+(indigo plant) fluorophor particle, gas blanket 9 is an atmosphere.The discharge spectrum of atmosphere is positioned at the ultraviolet region of wavelength 300nm～430nm, and above-mentioned fluorophor particle sends blue light by ultraviolet ray excited with electron excitation.Think wherein, luminous mainly by ultraviolet ray excited domination.And,, reduce brightness terrifically if gas blanket 9 is replaced into argon gas.This thinks, because the discharge spectrum of argon gas is luminous at wavelength 690nm～850nm, fluorophor particle can not because major part is luminous by electron excitation, be caused brightness to reduce by ultraviolet ray excited.In addition, if the shared area less than 3% of luminous element 2, owing to influenced by the discharge etc. on the 2nd insulator 5 surfaces, colourity changes, and is undesirable.
[0056]
On the contrary, ratio (A2/A1) is 20%, 35%, 40%, 55%, 65% and 75% o'clock, because fluorophor particle is by ultraviolet ray excited and electron excitation domination, brightness improves and becomes obvious.But if ratio (A2/A1) less than 40%, the raising effect of brightness is insufficient.In addition, when luminous element 2 was the porous material, ratio (A2/A1) was interior above the scope (situation shown in Fig. 9 B) of 40% less than 80%, 55%, 65% and 75%, further improved brightness.Think that this is,, more be easy to generate creeping discharge even also become, because the ratio of the bump of electronics and luminous element 2 uprises generation in luminous element 2 inside because luminous element 2 has thickness to a certain degree.And, luminous by electron excitation if as mentioned above gas blanket 9 is replaced into argon gas because that brightness reduces is some, if with ratio (A2/A1) be 3%, 5% and 10% situation relatively, can access the brightness of 2 times of degree.And ratio (A2/A1) is 85% and 95% o'clock, and brightness reduces a little.In addition, even it is similar that gas blanket 9 is replaced into the situation of argon gas and atmosphere, brightness does not change.Think that this is that luminous mainly is to be arranged by electron excitation because discharge space is too small.
[0057]
Know according to above situation,, improve brightness, ratio (A2/A1) should be set at than 40% bigger value owing to, when obtaining light, obtain producing light by the electron excitation in the luminous element 2 by luminous element 2 by radiation by the discharge generation in the gas blanket 9.In addition, when not having gas blanket 9 fully, on the contrary, can not obtain luminous fully.Therefore, ratio (A2/A1) need be set at above 0.4, and less than 1.Be limited under the best ratio (A2/A1) above 0.5, also can surpass 0.6.
[0058]
Like this, in the light-emitting device of present embodiment, cause to have the big advantage of ratio change that can make luminous element 2 areas of section shared by ultraviolet ray excited and electron excitation owing to luminous.And by disposing the 3rd electrode 10, the control electric field makes the gas-insulated destruction transfiguration that is produced by the electric field that is applied to 7 at the 1st electrode 6 and the 2nd electrode easy.And because capacitive component and dielectric constant are proportional, the ratio of the electronics that moves along the surface of low the 1st insulator of resistance and the 2nd insulator increases.Its result also increases in these luminous element 2 ratios surperficial or the inner electronics that moves, infers the electronics and luminous element 2 collisions of emitting.And,, can control electronics a large amount of and the degree of depth and luminous element 2 collisions, or the phase revertive control is not so that electronics collides the direction that scans out with luminous element 2 by controlling the electric field of the 3rd electrode 10.
[0059]
In each execution mode, in atmosphere, drive, no matter confirmed the carrier of oxygen monomer, the nitrogen monomer, perhaps oxygen and nitrogen mixing ratio are perhaps implemented luminous too in the gas that is depressurized.Luminous too when in addition, having confirmed to use the mist that adds the xenon of volume ratio below 2% in the above-mentioned all gases.
[0060]
By the light-emitting device of each execution mode, because owing to form luminous element by thick-film technique etc., as in the past, when making light-emitting device, the requirement of the thickness of layer is become not tight, do not need vacuum system and current-carrying enhancement layer, simple structure, it is also easy to make and process.And, have in luminous element with porous material structure, as common fluorophor, be not only at its surface light emitting, because irradiated electronics arrives the inside of the luminous element with porous material structure, the feature that luminous element integral body is luminous equably everywhere.In addition, if with plasma display in the ultraviolet ray carried out produce the luminous of fluorophor and compare, luminous efficiency is extremely good.And, can be provided in the giant display that to consume electric power when using smaller, textural, height becomes more meticulous can be than the light-emitting device that is easier to realize.And, to surround the mode around the luminous element, be provided with by setting and play the 1st insulator as the spaced walls function as the discharge separating mechanism, can easily avoid luminous cross-talk.
[0061]
Because light-emitting device of the present invention can form luminous element by thick-film technique etc., as in the past, when making light-emitting device, the requirement of the thickness of layer is become not tight owing to do not need vacuum system and current-carrying enhancement layer, simple structure, make and processing also easy.And owing to compare with PDP, luminous efficiency is also excellent, and is especially useful with light-emitting device as display.
Claims (16)
1, a kind of light-emitting device possesses:
A plurality of the 1st insulators, it is arranged on relative position;
The luminous element that contains a plurality of fluorophor particles, it is configured in the space between above-mentioned a plurality of the 1st insulator;
The 2nd insulator, it plays the function as the base station of above-mentioned a plurality of the 1st insulators and above-mentioned luminous element;
A plurality of electrodes, it forms electric field in above-mentioned space; With
Substrate, it is faced with above-mentioned the 2nd insulator mutually across above-mentioned luminous element,
By in perpendicular to above-mentioned the 2nd insulator surface and the section cut by the plane of above-mentioned space central authorities, extend and above-mentioned the 1st insulator to be set on reaching aforesaid substrate the time, the area of section A2 of above-mentioned luminous element with respect to by the ratio (A2/A1) of the area of section A1 in above-mentioned the 1st insulator, zone that above-mentioned the 2nd insulator and aforesaid substrate surrounded for surpassing 0.4 less than 1
The superficial layer of above-mentioned luminous element or the integral body of above-mentioned luminous element are the porous material.
2, light-emitting device according to claim 1 is characterized in that,
The 1st insulator and the 2nd insulator are formed by same material.
3, light-emitting device according to claim 1 is characterized in that,
The dielectric constant of above-mentioned the 1st insulator and the 2nd insulator is more than 5.
4, light-emitting device according to claim 1 is characterized in that,
Above-mentioned the 1st insulator and the 2nd insulator one side's dielectric constant is more than 30, and the opposing party is more than 5.
5, light-emitting device according to claim 1 is characterized in that,
Above-mentioned the 1st insulator and above-mentioned the 2nd insulator are formed by the composite material of glass material or glass material and metal oxide.
6, light-emitting device according to claim 1 is characterized in that,
Above-mentioned a plurality of electrode comprises and clips front electrode and the backplate of above-mentioned luminous element in opposite side configuration, and above-mentioned front electrode covers with insulating barrier.
7, light-emitting device according to claim 6 is characterized in that,
Above-mentioned insulating barrier is the layer that contains alkaline-earth metals oxide.
8, light-emitting device according to claim 1 is characterized in that,
Possesses the gas blanket that between above-mentioned luminous element and aforesaid substrate, forms.
9, light-emitting device according to claim 8 is characterized in that,
Above-mentioned gas contains aerobic or nitrogen.
10, light-emitting device according to claim 9 is characterized in that,
It is more than 1% that oxygen and nitrogen account for whole volume ratio.
11, light-emitting device according to claim 8 is characterized in that,
Above-mentioned gas is to contain xenon and xenon-133 gas to account for whole volume ratio be mist below 2%.
12, light-emitting device according to claim 8 is characterized in that,
The pressure of above-mentioned gas is 5 * 10
3Pa above 9 * 10
4Below the pa.
13, light-emitting device according to claim 8 is characterized in that,
The average thickness of the layer of the above-mentioned gas of above-mentioned space central authorities is littler than the average thickness of above-mentioned luminous element.
14, light-emitting device according to claim 1 is characterized in that,
Each of above-mentioned a plurality of the 1st insulators has, from above-mentioned the 2nd insulator to the outstanding timber structure of aforesaid substrate.
15, light-emitting device according to claim 1 is characterized in that,
Above-mentioned a plurality of the 1st insulator between above-mentioned the 2nd insulator and aforesaid substrate, constitutes the spaced walls of separating each self luminous a plurality of unit.
16, light-emitting device according to claim 15 is characterized in that,
Between above-mentioned spaced walls and aforesaid substrate, be provided with the gap.
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|---|---|---|---|
| JP2005110602 | 2005-04-07 | ||
| JP110602/2005 | 2005-04-07 | ||
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