CN1781340A - Organic electroluminescent device - Google Patents

Abstract

The present invention provides organic EL devices which have on their anode at least a light-emitting layer, an electron-injecting-transporting layer, and a cathode giving an elongated lifetime, organic EL devices giving a superior whiteness, a higher light-emitting efficiency, and an elongated lifetime compared to conventional ones, and color displays using such organic EL devices. On anode (10), hole-injecting-transporting layer (11), light-emitting layer (12), non-light-emitting layer (13), electron-injecting-transporting layer (14), and cathode (15) in this order are laminated. Otherwise, on an anode, a hole-injecting layer, a hole-transporting layer, a red light-emitting layer, a blue light-emitting layer, an electron-transporting layer, an electron-injecting layer, and a cathode in this order are laminated.

Description

Organic electroluminescent device

Technical field

The present invention relates on anode, be provided with at least the organic electroluminescent device of luminescent layer, electronics injection transport layer and negative electrode.The invention still further relates to the organic electroluminescent device that on anode, is provided with organic luminous layer and negative electrode at least successively.

Background technology

In the past, known have between electrode of opposite, possess the luminescent layer that contains organic luminescent material, electric current flows through between electrode, the organic electroluminescent device (organic EL) that light (electroluminescence) is sent by luminescent layer.Its luminescent layer requires to have following function.

The electronics function of injecting

Inject the function of electronics by electrode (negative electrode).The electronics injection.

The hole function of injecting

Function by electrode (anode) injected hole.The hole injection.

The carrier transport function

At least one side's in transmission electronic and hole function.Carrier transport.

The function of transmission electronic is called electric transmission function (electron-transporting), and the function of transporting holes is called hole transport function (hole transport ability).

Lighting function

It is compound to inject electrons transmitted and charge carrier, produces exciton, sends the function of light when replying ground state.

Known technology in the past is that the one or more layer that will undertake in above-mentioned each function is provided with respectively with luminescent layer.For example known technology in the past is that the floor (electronics injection transport layer) (for example with reference to TOHKEMY 2002-164174 communique) of undertaking electronics function of injecting and electric transmission function is set.By like this with the luminescent layer branch electronics injection transport layer (function is separated) that is arranged, can obtain following effect usually.

Driving voltage reduces

Stable by negative electrode to the electronics injection of luminescent layer, so the life-span is long

The tack of negative electrode and luminescent layer improves, and therefore can improve the uniformity of light-emitting area

With the coverings such as projection of negative electrode, can reduce the element defective.

In recent years, people can enumerate application on full-color display spare to the very big expectation of organic electroluminescent device.As a method using organic electroluminescent device to carry out panchromatic demonstration, known the white light that organic electroluminescent device is sent is divided into red, green, blue by colour filter, and used here organic electroluminescent device requires to have following characteristic.

The harmony of each luminous intensity of red, green, blue is good

The luminous efficiency height

Component life is long.

Therefore, as the better organic electroluminescent device of each luminous intensity harmony of red, green, blue, known have a kind of organic electroluminescent device: be provided with blue light-emitting layer and green light emitting layer successively as organic luminous layer from its anode one side, and this green light emitting layer contains the dopant that glows (for example with reference to Japanese kokai publication hei 7-142169 communique).

Summary of the invention

But the organic EL that the layer of undertaking electronics function of injecting or electric transmission function is set respectively by above-mentioned and luminescent layer also is difficult to obtain enough life-spans (component life) in actual applications.

And the organic electroluminescent device of the coloured light that turns white in the past also has the problem that whiteness is bad, luminous efficiency is low, component life is short.

The present invention in view of the above problems, purpose is to make and is provided with luminescent layer, electronics at least injects life-span (component life) of organic electroluminescent device of transport layer and negative electrode than more prolong in the past on anode.

The present invention in view of the above problems, purpose is to make the whiteness that is provided with the organic electroluminescent device of organic luminous layer and negative electrode on anode at least successively, luminous efficiency and component life than more improve in the past.

For achieving the above object, the feature of organic electroluminescent device of the present invention is: be provided with luminescent layer, electronics and inject transport layer and negative electrode on anode, electronics injects to be provided with between transport layer and the luminescent layer and possesses electron-transporting and hole transport ability are injected the transmission floor height than electronics not luminescent layer (the balanced regulating course of non-luminous charge carrier).Electronics injects transport layer and can be made of individual layer, also can constitute by lamination.For example can constitute electronics and inject transport layer by electron injecting layer and electron transfer layer.

The high/low of electron-transporting and hole transport ability for example can be learnt by time-of-flight method (TOF method).That obtained by the TOF method is mobility of charge carrier rate (cm ²/ Vs), voltage and sample thickness that it can apply by transient current, to sample are calculated, and wherein transient current is the sample surfaces that has applied voltage with the pulsed light irradiation, and the charge carrier that is produced by pulsed light produces when moving through (in the layer) in the sample.Specifically, making will be measured the independent film (for example layer about 10-20 μ m) of the layer of electron-transporting/hole transport ability, uses this film to measure the mobility of charge carrier rate.Electron-transporting/the hole transport ability of each material is following to be estimated: make the layer (for example film about 10-20 μ m) that only contains this material, use this layer mensuration carrier mobility, estimate electron-transporting/hole transport ability by this carrier mobility.In the scope of the electric field strength that the condition of the electric field strength that is added when measuring carrier mobility is added when being in the organic EL practical application.

Therefore, above-mentioned organic electroluminescent device also comprises following organic electroluminescent device: be provided with luminescent layer, electronics injection transport layer and negative electrode on anode, electronics injects the not luminescent layer that possesses electron-transporting and hole transport ability is set between transport layer and the luminescent layer, and the hole mobility of the TOF law regulation of luminescent layer is not injected the hole mobility height of the TOF law regulation of transport layer than electronics.

In this specification, " possessing electron-transporting " is meant at least relatively member floor height of nearlyer anode one side of luminescent layer of electron-transporting, and preferred electron transmission property is than luminous floor height.Certainly, can be with electronics inject the electron-transporting of transport layer equal or more than.

The electron-transporting of the not luminescent layer of above-mentioned organic electroluminescent device can be higher than hole transport ability (surpass, big).For example, preferably make the hole mobility height of the electron mobility of the TOF law regulation of luminescent layer not than TOF law regulation.

Not luminescent layer in first or second organic electroluminescent device can contain the material of following (1) or (2).

(1) possess electron-transporting, and hole transport ability is injected the high material of transport layer than electronics.

For example comprise: the hole mobility that possesses electron-transporting and hole transport ability, TOF law regulation is injected the high material of hole mobility of the TOF law regulation of transport layer than electronics.

(2) one or more possesses the electron transporting material of electron-transporting and possesses one or more hole transport ability material that injects the also high hole transport ability of transport layer than electronics.

For example the hole transport ability material comprises hole mobility one or more material higher than the electron mobility of the electron transporting material of TOF law regulation of TOF law regulation.

In above-mentioned (2), electron transporting material at least a can be at least a identical materials of injecting the material that transport layer contains with electronics, perhaps/further, hole transport ability material at least a can be with luminescent layer at least a identical materials of the material that contains.

In above-mentioned (2), the electron-transporting of electron transporting material can be than the hole transport ability height of hole transport ability material.For example, can be that the electron mobility of TOF law regulation of electron transporting material is than the hole mobility height of the TOF law regulation of hole transport ability material.

It is hole transport ability that organic electroluminescent device of the present invention is particularly suitable for luminescent layer, that is to say the element that hole transport ability is higher than electron-transporting.

Bipolar materials in this specification is that hole mobility and electron mobility all are 10 in the scope of the electric field strength that added when the organic EL practical application ^-8Cm ²/ Vs or above material.

The feature of organic electroluminescent device of the present invention is: set gradually organic luminescent layer and negative electrode on anode at least, organic luminous layer sets gradually red light emitting layer and blue light-emitting layer by anode one side, and red light emitting layer contains the green light dopant.

The luminescent spectrum of above-mentioned organic electroluminescent device is preferably at 440nm or above but 490nm or following, 510nm or above but 550nm or following, and at 580nm or above but 680nm or following zone have maximal point.

Between above-mentioned red light emitting layer and the above-mentioned blue light-emitting layer luminous regulating course can be set.Whiteness, luminous efficiency and component life are further improved.And the thickness of preferred above-mentioned blue light-emitting layer is bigger than the thickness of above-mentioned red light emitting layer.Here " luminous regulating course " is meant the layer of the luminous strength ratio of regulating luminescent material.

Preferred above-mentioned red light emitting layer contains at least a dopant that glows.

Wish the hole mobility height of the hole mobility of above-mentioned red light emitting layer than above-mentioned blue light-emitting layer.

Colour display device of the present invention is characterised in that: possess above-mentioned organic electroluminescent device and absorb at least a filter of a part of the luminescent spectrum of this organic electroluminescent device.The light-emitting zone of preferred this organic electroluminescent device is in the regional transmission of this filter.

According to the present invention, the life-span that can make the organic electroluminescent device that is provided with luminescent layer, electronics injection transport layer and negative electrode on anode is than do not adopt the organic electroluminescent device of formation of the present invention longer in the past.

According to the present invention, can make the whiteness, luminous efficiency and the component life that on anode, set gradually the organic electroluminescent device of organic luminescent layer and negative electrode at least than do not adopt the organic electroluminescent device of formation of the present invention more to improve in the past.

The accompanying drawing summary

Fig. 1 is the sectional view of layer configuration example that is used to illustrate the organic electroluminescent device of first embodiment.

Fig. 2 is the sectional view of layer configuration example that is used to illustrate the organic electroluminescent device variation of first embodiment.

Fig. 3 is the sectional view that the layer of the organic electroluminescent device variation of expression first embodiment constitutes.

Fig. 4 is the sectional view that the layer of the organic electroluminescent device variation of expression first embodiment constitutes.

Fig. 5 is the sectional view of layer configuration example that is used to illustrate the organic electroluminescent device of second embodiment.

Fig. 6 is the summary pie graph that the integral body of colour display device constitutes.

Fig. 7 is the schematic sectional view of organic electroluminescence panel used in the colour display device of Fig. 6.

Fig. 8 is the transmission peaks wavelength of colour filter used in the colour display device of presentation graphs 6 and half value is wide and the glow peak wavelength of organic electroluminescent device and the wide table of half value thereof.

The best mode that carries out an invention

Following with reference to accompanying drawing, the organic EL of embodiment of the present invention is elaborated.

First embodiment

" layer constitutes "

The organic EL of first embodiment be on anode, form luminescent layer at least successively, luminescent layer, electronics do not inject transport layer, negative electrode and constitute.That is, it is characterized in that: luminescent layer and electronics inject between the transport layer not luminescent layer of the present invention are set.

Following according to shown in Figure 1, on substrate 2, form anode 10, on anode 10, form hole injection/transport layer 11, luminescent layer 12 successively, luminescent layer 13, the electronics organic EL that injects transport layer 14 and negative electrode 15 does not describe, the layer of other form constitutes and can certainly use.

For example, can be make luminescent layer have hole injection/transport layer function, be hole function of injecting and hole transport function, omit hole injection/transport layer thus; Perhaps electronics is injected the electron transfer layer that transport layer functionality is separated into the electron injecting layer of undertaking the electronics function of injecting and undertakes the electronics function of injecting, lamination it; More particularly, can adopt following layer to constitute.

Luminescent layer/electron transfer layer/electron injecting layer/the negative electrode of anode/hole injection layer/hole transmission layer/luminescent layer/not

Anode/hole injection layer/hole transmission layer/luminescent layer/luminescent layer/electronics does not inject transport layer/negative electrode

Luminescent layer/electron transfer layer/electron injecting layer/the negative electrode of anode/hole injection/transport layer/luminescent layer/not

Anode/hole injection/transport layer/luminescent layer/luminescent layer/electronics does not inject transport layer/negative electrode

Luminescent layer/electron transfer layer/electron injecting layer/the negative electrode of anode/hole transmission layer/luminescent layer/not

Anode/hole transmission layer/luminescent layer/luminescent layer/electronics does not inject transport layer/negative electrode

Luminescent layer/electron transfer layer/electron injecting layer/the negative electrode of anode/luminescent layer/not

Anode/luminescent layer/luminescent layer/electronics does not inject transport layer/negative electrode

More than each layer can have function beyond above-mentioned respectively, for example luminescent layer can possess hole transport function, hole function of injecting, electronics function of injecting and/or electric transmission function.

Above-mentioned layer in addition can also suitably be set.

Certainly, can form organic EL by negative electrode lamination successively on substrate.

In this specification, the layer that is not provided with between luminescent layer and the negative electrode is called electronics in the lump injects transport layer.

At first, luminescent layer not is elaborated.

" luminescent layer 13 "

Luminescent layer 13 is not to be located at electronics to inject between transport layer 14 and the luminescent layer 12, possesses electron-transporting, and hole transport ability is not undertaken the layer of lighting function than electronics injection transport layer 14 height.

Electron-transporting and hole transport ability for example can be according to the TOF law regulations.That is to say that luminescent layer 13 not can be described as layer as follows.

The hole mobility that the TOF method is measured is injected the high layer of hole mobility of transport layer 14 than the electronics by the TOF law regulation.

Regulate the layer (the balanced regulating course of charge carrier) of the equilibrium of charge carrier (hole and electronics) in luminescent layer 12.

Do not undertake the layer of lighting function.

＜mechanism 〉

The organic EL of the present embodiment possesses aforesaid not luminescent layer 13, so the life-span of element ratio length in the past.Its reason (mechanism) can be estimated as following mechanism 1 or mechanism 2.

(mechanism 1)

Can think that hole or exciton are difficult to enter electronics and inject transport layer 14, so electronics injects the deterioration ratio minimizing in the past of transport layer 14, component life prolongation as a result.

In the organic EL in the past, by anode-side inject be transferred to luminescent layer a part of hole in luminescent layer and electron recombination, enter electronics and inject transport layer.And the hole transport ability of the electronics injection transferring material that electronics injection transport layer contains is extremely low, and is therefore low to the patience in hole.Thereby, think that in a single day the hole enters electronics and inject transport layer, then electronics injects the electronics injection transferring material deterioration in transport layer or this layer.

In addition, in the organic EL in the past, the hole that enters produces exciton with injected electrons transmitted by cathode side compound, or exciton enters by luminescent layer one side, causes electronics to inject transport layer or the interior electronics injection transferring material deterioration of this layer because of this exciton.

Relative therewith, in the not luminescent layer 13 of the present embodiment, hole transport ability is injected transport layer 14 height than electronics, therefore injects transport layer 14 height for the patience of hole that enters or exciton than electronics.

In addition, luminescent layer 13 does not have electron-transporting, therefore can transport the photosphere 12 of setting out with injected transport layer 14 electrons transmitted by electronics.That is to say that hole and electronics be nearly all at luminescent layer 12 and not compound in the luminescent layer 13, therefore compare, inject the compound and hole of transport layer 14 at electronics and enter the situation that electronics injects transport layer 14 and reduce with not having not the element in the past of luminescent layer 13.

Like this, hole or exciton are difficult to enter the strong electronics of deterioration that causes because of hole or exciton and inject transport layer 14, and than electronics injection transport layer 14 height, therefore luminescent layer 13 and electronics do not inject the deterioration of transport layer 14 than the deterioration minimizing of the electronics injection transport layer 14 of element in the past to luminescent layer 13 for the patience of hole or exciton.As a result, the component life of the organic EL of the present embodiment prolongs.

(mechanism 2)

Luminescent layer 13 does not have hole transport ability and electron-transporting, therefore exciton accumulates (have the probability height, increase) and injects the interface of transport layer 14 (with the interface of negative electrode 15 opposition sides in electronics, below suitably be called the interface of transport layer 14 " electronics inject ") situation reduce, the deterioration that electronics injects transport layer 14 is than in the past minimizing.Thereby can think this comparable component life that in the past prolonged.

In the past known, the interface of electronics injection transport layer and the exciton of near interface are many, and electronics injects the easy deterioration of transport layer.

On the other hand, as mentioned above, electronics injects transport layer and has hole transport ability hardly, therefore is present in electronics injection transport layer interface and near interface by luminescent layer in a large number to the hole that electronics injects the transmission of transport layer one side.Thereby, inject electrons transmitted by cathode side and combine with this hole, inject transport layer interface and near interface generation exciton at electronics.

Thereby in the organic EL in the past, exciton lodges in interface and the near interface that electronics injects transport layer easily, so the easy deterioration of electronics injection transport layer, and the result we can say to be difficult to obtain enough component life.

Relative therewith, the not luminescent layer 13 of the present embodiment possesses than electronics and injects the high hole transport ability of transport layer 14, therefore, the hole can be transferred to electronics by the interface (and near interface) of luminescent layer 13 and luminescent layer 12 not and inject transport layer 14 sides.In addition, luminescent layer 13 does not possess electron-transporting yet, therefore, can be transferred to luminescent layer 12 with injected transport layer 14 electrons transmitted by electronics, simultaneously, can make the hole of moving in luminescent layer 13 not in luminescent layer 13 not and electron recombination, the generation exciton.That is to say, can make be present in electronics inject transport layer 14 and not the amount of the exciton of the interface of luminescent layer 13 and near interface lack more in the past than the amount of the exciton of the interface of organic EL electronics injection transport layer that was not provided with luminescent layer 13 not and luminescent layer and near interface existence.Therefore, in the organic EL of the present embodiment, the deterioration of electronics injection transport layer 14 is lacked than organic EL in the past, and the result can be than organic EL life-saving in the past.

Above mechanism can be described as that luminescent layer 13 is more not high than the hole mobility of TOF law regulation by the electron mobility that makes the TOF law regulation, makes electron-transporting increase with respect to hole transport ability.

Such formation can make in luminescent layer 13 not, and injecting hole that amount/speed ratio that transport layer 14 electrons transmitted move to luminescent layer 12 enters by luminescent layer 12 by electronics, to inject amount/speed that transport layer 14 moves to electronics big.Therefore, the situations that hole or exciton enter in the electronics injection transport layer 14 further reduce, and in addition, further reduce at the interface of electronics injection transport layer 14 and accumulate (exciton exists probability to increase) of near interface in the hole.Thereby, can more reduce the deterioration that electronics injects transport layer 14, the component life that can further prolong organic EL.

As mentioned above, by improving the electron mobility in the luminescent layer 13 not, luminous efficiency is improved more.

And, if above-mentioned formation then can make luminescent layer 12 interior holes higher than in the past with the ratio of electron recombination, therefore can be than more improved luminous efficiency in the past.

Luminescent layer 13 can not formed by single material, can be formed by multiple material yet.Below, to the material that contains in the luminescent layer 13 not and not the manufacture method of luminescent layer 13 describe.

＜constitute by homogenous material

Not during luminescent layer 13, can using not, luminescent layer 13 has electron-transporting and has the material that injects the high hole transport ability of transport layer 14 (constituting the material that electronics injects transport layer 14) than electronics by single material.This material for example has and possesses electron-transporting, the hole mobility of TOF law regulation is injected the high material of hole mobility of transport layer 14 than the electronics of TOF law regulation, more particularly, can suitably select from following material.

Diphenylethyllene arylene derivative, the diphenylethyllene benzene derivative, the talan yl amine derivatives, quinolinolate is a metal complex, the triarylamine derivative, azomethine derivative oxadiazole derivative, the pyrazoles quinoline, sila cyclopentadiene (シ ロ-Le) derivative, the connection carbazole derivates, Oligopoly thiophene derivative, the tetraphenylbutadiene derivative, 1-benzopyran derivatives, triazole derivative benzoxazole derivative, benzothiazole derivant, three (oxine) aluminium, N, N '-two (4 '-diphenyl amino-4-xenyl)-N, N '-diphenylbenzidine, 4,4 '-two (2,2 '-diphenylacetylene) biphenyl etc.

In these materials, preferably select not follow luminous material when forming not luminescent layer 13.Its reason is: if luminescent layer 13 is not just in case luminous, then diminish the luminous colourity of luminescent layer 12 etc.

＜constitute by multiple material

By multiple material not during luminescent layer 13, select one or more electron transporting material that possess electron-transporting and one or more to possess the hole transport ability material that injects the high hole transport ability of transport layer 14 than electronics at least.The hole transport ability material can be the hole mobility high material of the hole mobility of TOF law regulation than the TOF law regulation of the electron transporting material that contains in the luminescent layer 13 not.

Can make the electron-transporting of electron transporting material bigger than the hole transport ability of hole transport ability material.When for example selecting material, make the electron mobility of electron transporting material of TOF law regulation bigger than the hole mobility of the hole transport ability material of TOF law regulation, then in luminescent layer 13 not, electron mobility surpasses hole mobility, therefore can obtain above-mentioned effect.

As electron transporting material, get final product so long as have the material of above character, for example can be by selecting in the following material.

1, two [5 '-(to tert-butyl-phenyl)-1,3, the 4-oxadiazole-2 '-yl] benzene of 3-or 2-(4-xenyl)-5-(4-tert-butyl-phenyl)-1,3, oxadiazole derivatives such as 4-oxadiazole; Or 3-(4 '-tert-butyl-phenyl)-4-phenyl-5-(4 "-biphenyl)-1,2, triazole derivatives such as 4-triazole etc.

The heterocycle tetracarboxylic anhydride of pyrrolotriazine derivatives, perylene derivative, quinoline, quinoxaline derivant, diphenyl quinone derivative, nitro substituted fluorene ketone derivatives, titanium dioxide thiapyran derivative, anthraquinone bismethane (ア Application ト ラ キ ノ ジ メ Application) derivative, titanium dioxide thiapyran derivative, Nai perylene etc., carbodiimide, fluorenylidene methane Derivatives, anthraquinone bismethane derivative, anthracyclinone derivatives, diphenylethyllene pyrazines derivatives etc.

Two (10-benzo [h] quinolinol) beryllium, the beryllium salt of 5-flavonol, the metal-organic complexs such as aluminium salt of 5-flavonol, the metal complex of oxine or derivatives thereof etc.More particularly, have and contain oxine (the metallo-chelate oxine type compound that claims 8-quinolinol or oxine chelate usually, three (oxine) aluminium, three (5 for example, the 7-dichloro-8-hydroxyquinoline) aluminium, three (5, the 7-dibromc-8-hydroxyquinoline) aluminium, three (2-methyl-oxine) aluminium etc.Also enumerate central metal with these metal complexs and be replaced into indium, magnesium, copper, calcium, tin or plumbous metal complex etc.Also can use no metal or metal phthalocyanine or their end to be replaced by alkyl, sulfuryl etc.

The hole transport ability material for example can use following material so long as possess the material of above-mentioned character and get final product.

Diphenylethyllene benzene derivative, talan yl amine derivatives, triarylamine derivative, azomethine derivative, diphenylethyllene arylene derivative, oxadiazole derivative, connection carbazole derivates, Oligopoly thiophene derivative, tetraphenylbutadiene derivative, 1-benzopyran derivatives, triazole derivative, benzoxazole derivative, benzothiazole derivant etc.

Preferred diphenylethyllene arylene derivative, stilbene derivative, carbazole derivates, the triarylamine derivative of adopting, further preferred N, N '-two (4 '-diphenyl amino-4-xenyl)-N, the N '-diphenylbenzidine of adopting.

According to above-mentioned same reason, non-luminous material in the time of can from the above material that exemplifies, suitably selecting to form not luminescent layer 13.

Electron transporting material at least a can be to inject the material that transport layer 14 contains/can inject at least a identical materials of the material that transport layer 14 uses at electronics with electronics.That is, electronics can be injected the electron transporting material that transport layer 14 contains uses as electron transporting material.

Such formation can prolong component life (can reduce the deterioration of electron transporting material in the deterioration/non-luminescent layer 14 of non-luminescent layer 14), and this is owing to contain the hole transport ability material in the non-luminescent layer 14.That is to say, the hole transport ability material has patience to hole and exciton, inject the electron transporting material that transport layer 14 is contained even therefore contain electronics in the non-luminescent layer 14, compare, also can reduce the deterioration of layer with the layer that only constitutes by this electron transporting material.

Hole transport ability material at least a can be with luminescent layer 12 at least a identical materials of material of the material/can in luminescent layer 12, use that contains, but luminous in order not make in luminescent layer 13 not, for example can followingly carry out.

As described later, constitute luminescent layer 12, use the not hole transport ability material of luminescent layer 13 of aforementioned body material conduct by material of main part and dopant.

In this case, not luminous (not the seeing glow peak) that does not have material of main part self.

Use is used to form luminescent layer 12 but the material that do not contain in the luminescent layer 12, is not containing not luminous sometimes (not seeing glow peak) in the luminescent layer 13.

＜manufacture method 〉

Luminescent layer 13 can not use the film build method of known each layers of formation organic EL such as sputtering method or ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, makes by film forming above-mentioned material on luminescent layer 12.For example, use three (oxine) aluminium as the hole transport ability material, by be total to evaporation on luminescent layer 12, can form not luminescent layer 13 as electron transporting material, two (2-methyl-8-quinolinol) (p-phenyl phenol closes) aluminium.The not luminescent layer 13 of Xing Chenging has the effect (long-life etc.) of above-mentioned not luminescent layer 13 like this.In addition, do not observe luminous (i.e. the glow peak that produces by three (oxine) aluminium etc.) from luminescent layer 13 not.

The thickness of luminescent layer 13 is not according to the material that is adopted and difference is generally about 0.5nm-50nm.

As mentioned above, if inject between the transport layer 14 at the luminescent layer 12 of organic EL and electronics not luminescent layer 13 is set, then comparable do not have in the past not that the organic EL of luminescent layer 13 more prolongs component life.

When making is provided with the organic EL of luminescent layer 13 not, as can be known: flow through the size of the electric current of organic EL, promptly the colourity that is caused by brightness changes littler than the organic EL in the past of not establishing luminescent layer 13 not.

Below, the layer beyond the luminescent layer is not described.

" anode 10 "

Anode 10 is the electrodes to hole injection/transport layer 11 injected holes.Therefore, be used to form the material of anode 10, can select metal, alloy, electric conductive compound and their material known such as mixture usually so long as the material that makes anode 10 have this character gets final product.

The material that is used to form anode 10 for example has following material.

Metal oxide or metal nitrides such as ITO (indium-tin-oxide), IZO (indium-zinc oxide), tin oxide, zinc oxide, Zinc-aluminium, titanium nitride;

Metals such as gold, platinum, silver, copper, aluminium, nickel, cobalt, lead, chromium, molybdenum, tungsten, tantalum, niobium;

The alloy of these metals or the alloy of cupric iodide etc.,

Electroconductive polymers such as polyaniline, polythiophene, polypyrrole, polyphenylene vinylene, poly-(3 methyl thiophene), polyphenylene sulfide etc.

When anode 10 was compared with luminescent layer 12 and more is located at light and takes out a side, the optical transmission rate that is set at usually being taken out was bigger than 10%.Extract the light time of visible region, preferably use the high ITO of transmissivity in the visible region.

When using, can in above-mentioned material, suitably select to possess the material that the light that will take out reflexes to outside performance, select metal, alloy or metallic compound usually as reflection electrode.

Anode 10 can only be formed by a kind of of above-mentioned material, also multiple mixing can be formed.Can also be to contain the multilayer same composition or the sandwich construction of composition of the same race not.

When the resistance of anode 10 is high, auxiliary electrode can be set, to reduce resistance.Auxiliary electrode is metals such as copper, chromium, aluminium, titanium, aluminium alloy or its laminate and anode 10 parts and the electrode established.

Anode 10 uses above-mentioned materials, forms by known film formation methods such as sputtering method or ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating methods.

Can also carry out ozone washing, oxygen plasma washing or UV washing, the work content on surface is increased.The short circuit or the defective that be to suppress organic EL take place, and the method for polishing after method that can be by making the particle diameter microminiaturization or the film forming is controlled to be 20nm or following when surface roughness is represented with root-mean-square value.

The thickness of anode 10 is according to employed material and difference is generally about 5nm-1 μ m, and about preferred 10nm-1 μ m, about further preferred 10-500nm, about preferred especially 10nm-300nm, desirable selects in the scope of 10-200nm.

The sheet resistance of anode 10 is preferably set to hundreds of ohm/sheets or following, more preferably about 5-50 ohm/sheet.

" hole injection/transport layer 11 "

Hole injection/transport layer 11 is layers of being located between anode 10 and the luminescent layer 12, is by anode 10 injected holes, institute's injected holes is transferred to the layer of luminescent layer 12.Usually the ionization potential of hole injection/transport layer 11 is set between the ionization potential of the work content of anode 10 and luminescent layer 12, is set at 5.0eV-5.5eV usually.

Therefore organic EL shown in Figure 1 has following character owing to possess hole injection/transport layer 11.

Driving voltage is low.

Stable by anode 10 to the injection of the hole of luminescent layer 12, so component life is long.

Anode 10 improves with the tack of luminescent layer 12, therefore can improve the uniformity of light-emitting area.

With the coverings such as projection of anode 10, can reduce the element defective.

When hole injection/transport layer 11 more is located at light and is taken out a side than luminescent layer 12, be transparent formation for the light that is taken out.By suitably being chosen in the material that may form hole injection/transport layer 11 when making film above-mentioned light is material transparent, is set at for the optical transmission rate of taking out bigger than 10% usually.

As the material that is used to form hole injection/transport layer 11, so long as make hole injection/transport layer 11 have getting final product of above character, be not particularly limited, the well known materials of the well known materials that can be used by the hole-injecting material that can be used as photoconductive material or the hole injection/transport layer that is used for organic EL etc. selects arbitrarily that material uses.

Phthalocyanine derivates or triazole derivative are for example arranged, triarylmethane derivatives, triarylamine derivative oxazole derivative oxadiazole derivative, hydazone derivative, stilbene derivative, pyrazoline derivative, pyrazolone derivative, the polysilane derivative, imdazole derivatives, phenylenediamine derivative, the amino chalcone derivative that replaces, the styryl anthracene derivant, fluorene derivative, hydazone derivative, the silazane derivative, the aniline based copolymer, derivatives of porphyrin, polyaryl chain alkane derivatives, polyphenylene vinylene and derivative thereof, polythiophene and derivative thereof, poly-N-vinyl carbazole derivates etc., electroconductive polymer oligomer such as thiophene oligomers, the aromatic uncle amine compound, styryl amines etc.

Triarylamine derivative has: 4,4 '-two [N-phenyl-N-(4 "-aminomethyl phenyl) amino] biphenyl; 4; 4 '-two [N-phenyl-N-(3 "-aminomethyl phenyl) amino] biphenyl, 4,4 '-two [N-phenyl-N-(3 "-methoxyphenyl) amino] biphenyl; 4; 4 '-two [N-phenyl-N-(1 "-naphthyl) amino] biphenyl, 3,3 '-dimethyl-4,4 '-two [N-phenyl-N-(3 "-aminomethyl phenyl) amino] biphenyl; 1; 1-pair [4 '-[N; N-two (4 "-aminomethyl phenyl) amino] phenyl] cyclohexane, 9,10-pair [N-(4 '-aminomethyl phenyl)-N-(4 "-n-butylphenyl) amino] phenanthrene; 3; two (N; N-the diphenyl amino)-6-phenylphenanthridineands of 8-; 4-methyl-N; N-pair [4 ", 4 -two [N '; N "-two (4-aminomethyl phenyl) amino] biphenyl-4-yl] aniline, N; N "-two [4-(diphenyl amino) phenyl]-N, N '-diphenyl-1, the 3-diaminobenzene, N, N '-two [4-(diphenyl amino) phenyl]-N, N '-diphenyl-1, the 4-diaminobenzene, 5; 5 "-two [4-(two [4-aminomethyl phenyl] amino) phenyl]-2,2 ': 5 '; 2 "--チ オ Off ェ Application, 1,3,5-three (diphenyl amino) benzene, 4,4 '; 4 "-three (N-carbazyl) triphenylamine, 4,4 ', 4 " [N-(3 -aminomethyl phenyl)-N-phenyl amino] triphenylamine-three; 4,4 '; 4 "-three [N, N-two (4 -tert-butyl group biphenyl-4 " "-yl) amino] triphenylamine, 1,3,5-three [N-(4 '-diphenyl amino phenyl)-N-phenyl amino] benzene, the trimer of triphenylamine, N, N '-two (4 '-diphenyl amino-4-xenyl)-N, N '-diphenylbenzidine etc.

Porphyrin compound for example has: porphyrin, 1,10,15,20-tetraphenyl-21H, 23H-porphines copper (II), 1,10,15,20-tetraphenyl-21H, 23H-porphines zinc (II), 5,10,15,20-four (pentafluorophenyl group)-21H, 23H-porphines, silicon phthalocyanine oxide, aluminium phthalocyanine chloride, phthalocyanine (no metal), two lithium phthalocyanines, tetramethyl CuPc, copper phthalocyanine, chromium phthalocyanine, zinc phthalocyanine, plumbous phthalocyanine, titanium phthalocyanines oxide, magnesium phthalocyanine, prestox CuPc etc.

The example of aromatic uncle amine compound and styryl amines has: N, N, N ', N '-tetraphenyl-4,4 '-diamino-phenyl, N, N '-diphenyl-N, N '-two-(3-aminomethyl phenyl)-[1,1 '-biphenyl]-4,4 '-diamines, 2, two (the 4-di-p-tolyl aminophenyl) propane of 2-, 1, two (the 4-di-p-tolyl aminophenyl) cyclohexanes of 1-, N, N, N ', N '-four p-methylphenyl-4,4 '-diamino-phenyl, 1, two (4-di-p-tolyl the aminophenyl)-4-cyclohexylbenzenes of 1-, two (4-dimethylamino-2-aminomethyl phenyl) phenylmethane, two (4-di-p-tolyl aminophenyl) phenylmethane, N, N '-diphenyl-N, N '-two (4-methoxyphenyl)-4,4 '-benzidine, N, N, N ', N '-tetraphenyl-4,4 '-diamino-phenyl ether, 4,4 '-two (diphenyl amino) quaterphenyl, N, N, N-three (p-methylphenyl) amine, 4-(di-p-tolyl amino)-4 '-[4-(di-p-tolyl amino) styryl] Stilbene, 4-N, N-diphenyl amino-2-diphenylacetylene benzene, 3-methoxyl group-4 '-N, N-diphenyl amino ス チ Le ベ Application ゼ Application, N-phenyl carbazole etc.In addition, aromatics two methine based compounds also can be used as the material use of hole injection/transport layer 310.

Hole injection/transport layer 11 can be formed by a kind of of above-mentioned material, also multiple material mixing can be formed.In addition, can also be the sandwich construction that contains the multilayer of same composition or multiple composition.

Hole injection/transport layer 11 can form on anode with material by known forming thin film methods such as vacuum vapour deposition for example or spin-coating method, The tape casting, LB methods.

Thickness is according to selected material and difference is generally 5nm-5 μ m.

" luminescent layer 12 "

Luminescent layer 12 is mainly to be made of organic material, respectively from anode 10 1 sides and negative electrode 15 1 side injected hole and electronics, and at least one side of transporting holes and electronics, both are compound, form exciton, when exciton is replied ground state, send the layer of electroluminescence (light).

Therefore, the material (organic material) that is used to form luminescent layer 12 can have following function.

The transfer function that at least one side of institute's injected holes and electronics is moved by electric field force.

Electronics and hole-recombination, the function of generation excitation state (exciton).

Generate electroluminescent function when being returned to ground state by excitation state.

The representative example that possesses above materials with function has three (oxine) aluminium or Be-benzoquinoline alcohol.

Also can adopt following material.

2,5-two (5,7-two tertiary pentyls-2-benzoxazolyl)-1,3, the 4-thiadiazoles, 4,4 '-two (5,7-amyl group-2-benzoxazolyl) Stilbene, 4,4 '-two [5,7-two-(2-methyl-2-butyl)-2-benzoxazolyl] Stilbene, 2,5-two (5,7-two tertiary pentyls-2-benzoxazolyl)-thiophene, 2, two ([the 5-α of 5-, α-Er Jiajibianji]-the 2-benzoxazolyl) thiophene, 2,5-two [5,7-two-(2-methyl-2-butyl)-2-benzoxazolyl]-3, the 4-diphenyl thiophene, 2, two (5-methyl-2-benzoxazolyl) thiophene of 5-, 4,4 '-two (2-benzoxazolyl) biphenyl, 5-methyl-2-[2-[4-(5-methyl-2-benzoxazolyl) phenyl] vinyl] benzoxazolyl, 2-[2-(4-chlorphenyl) vinyl] naphtho-[1, benzoxazoles such as 2-d] oxazole system, 2,2 '-(to phenylene two ethenylidenes)-benzothiazoles such as bisbenzothiazole system, 2-[2-[4-(2-benzimidazolyl) phenyl] vinyl] benzimidazole, 2-[2-(4-carboxyl phenyl) vinyl] fluorescent whitening agent of benzimidazole system such as benzimidazole etc.;

Two (oxine) magnesium, two (benzo-8-quinolinol) zinc, two (2-methyl-8-quinolinol) aluminum oxide, three (8-quinolinol) indium, three (5-methyl-8-quinolinol) aluminium, 8-quinoline lithium alkoxide, three (5-chloro-8-quinolinol) gallium, two (5-chloro-8 quinolinols) calcium, poly-oxines such as [zinc-two (8-hydroxyl-5-キ ノ リ ノ ニ Le) methane] is a metal complex, metal chelating combination オ キ シ ノ イ De compounds such as two lithium エ ピ Application De リ ジ オ Application, 1, two (2-methyl styrene base) benzene of 4-, 1,4-(3-methyl styrene base) benzene, 1, two (the 4-methyl styrene base) benzene of 4-, diphenylethyllene benzene, 1, two (the 2-ethyl styrene base) benzene of 4-, 1, two (the 3-ethyl styrene base) benzene of 4-, 1, styryl benzene compounds such as two (2-methyl styrene base) the 2-methylbenzene of 4-, 2, two (the 4-methyl styrene base) pyrazines of 5-, 2, two (the 4-ethyl styrene base) pyrazines of 5-, 2, two [2-(1-naphthyl) vinyl] pyrazines of 5-, 2, two (4-methoxyl-styrene) pyrazines of 5-, 2, two [2-(4-biphenyl) vinyl] pyrazines of 5-, 2, ジ ス チ Le pyrazines derivatives such as two [2-(1-pyrenyl) vinyl] pyrazines of 5-, Naphthalamide derivatives perylene derivative oxadiazole derivative, the aldazine derivative, cyclopentadiene derivant, the styryl amine derivative, the coumarin series derivative, aromatics secondary methyl-derivatives, anthracene, salicylate, pyrene, phosphorescent light-emitting materials such as coronene or three (2-phenylpyridine) iridium etc.

Luminescent layer 12 can contain the material (luminous organic material/dopant) of undertaking electroluminescent systematic function and undertake other materials with function (material of main part).In this case, material of main part carries out the injection of charge carrier and the transmission of charge carrier, is excitation state by being composited.The material of main part that becomes excitation state is transferred to dopant with excitation energy.In addition, also can adopt following mechanism: material of main part transmits charge carrier to dopant, and is compound in dopant, and dopant sends light when replying ground state.Dopant produces electroluminescence when replying ground state.Dopant can use fluorescent material or phosphor material usually.

As long as material of main part possesses above-mentioned functions, can use material known.Its example has: diphenylethyllene arylene derivative, the diphenylethyllene benzene derivative, the talan yl amine derivatives, quinoline woods alcoholization system metal complex, the triarylamine derivative, azomethine derivative oxadiazole derivative, the pyrazolo quinoline, the sila cyclopentadiene derivant, naphthalene derivatives, anthracene derivant, connection carbazole derivates perylene derivative, Oligopoly thiophene derivative, the tetraphenylbutadiene derivative, 1-benzopyran derivatives, triazole derivative benzoxazole derivative, benzothiazole derivant.

Fluorescent material is epipolic material (fluorchrome, a fluorescent dopants), is the energy that obtains from material of main part, luminous material when moving to ground state.Usually, if the material that selection has high fluorescence quantum efficiency, then addition is 0.01 weight % to 20 weight % with respect to material of main part.

Fluorescent material can suitably select to possess the material known of above character, for example have: europium complex, 1-benzopyran derivatives, the rhodamine derivative, the benzothioxanthene derivative, derivatives of porphyrin, Nile red, hydrogen-1,1,7,7-tetramethyl-1H, 5H-benzo (i, j) quinolizine-9-yl)-vinyl)-and 4H-pyrans-4H-subunit) malononitrile, 4-(dicyano methylene)-2-(methyl)-6-(to dimethyl-amino-styryl)-4H-pyrans, coumarin derivative, quinacridone derivative, the talan yl amine derivatives, pyrene derivatives perylene derivative, anthracene derivant benzoxazole derivative, benzothiazole derivant, benzimidizole derivatives, the derivative, phenanthrene derivative, the diphenylethyllene benzene derivative, tetraphenylbutadiene, rubrene etc.

Phosphor material is phosphorescent material (phosphorescence pigment, a phosphorescent dopants), is the energy that obtains from material of main part, and is luminous when moving to ground state, can be at normal temperatures obtain luminous material from the singlet state and the triplet of excitation state.The addition of phosphor material (doping) is 0.01 weight % to 30 weight % with respect to material of main part usually.

Phosphor material is not particularly limited so long as can be used to the singlet state of self-excitation attitude at normal temperatures and the luminous material of triplet gets final product, and can use the phosphor material of using as luminescent layer and the material known of selecting.Usually use the luminiferous heavy metal complex of phosphorescence mostly.

For example, the green phosphorescent material can use three (2-phenylpyridine) iridium.Red phosphorescence material can use 2,3,7,8,12,13,17,18-octaethyl-21H23H-porphines platinum (II).The central metal of these materials can also be changed into other metal.

Luminescent layer 12 for example can pass through known filming methods such as vacuum vapour deposition or spin-coating method, The tape casting, LB method, is arranged on the hole injection/transport layer 11.

Thickness is according to the material that is adopted and difference is generally about 1nm-100nm, about preferred 2-50nm.

Can also make the illuminant colour colour mixture, or send two kinds or above light by in one deck, adding multiple dopant, or make energy by material of main part after low-energy first dopant shifts, energy is efficiently shifted to more low-energy second dopant.Also can adopt following mechanism: material of main part transmits charge carrier to dopant, carries out compoundly in dopant, produces light when dopant is replied ground state.

The adjusting of the colourity of the light that luminescent layer 12 sent (electroluminescence), purity, lightness, brightness etc. is by carrying out the selection of the material category that forms luminescent layer 12, the adjusting of addition, the adjusting of thickness etc.

The control method of the illuminant colour of luminescent layer 12 has following method.One or more that can use these methods are regulated illuminant colour.

Than luminescent layer 12 more dipped beam take out side the method that colour filter is regulated be set.

Colour filter is regulated illuminant colour by the wavelength that limits transmission.Colour filter for example can use as the cobalt oxide of blue optical filtering body, as the cobalt oxide of green optical filtering body and the mixed stocker of chromium oxide, as the material known such as iron oxide of redness optical filtering body, for example using, known forming thin film method such as vacuum vapour deposition forms on substrate 2.

Interpolation promotes luminous or hinders luminous material, the method for regulating illuminant colour.

For example, accept energy, this energy is transferred to dopant, add the so-called dopant that helps, then can energy be shifted to dopant by material of main part by material of main part.Help dopant can suitably select material known, for example from the above-mentioned material that can be used as material of main part or dopant, select.

In the layer (comprising substrate 2) that more is in light taking-up side than luminescent layer 12, add the material of Wavelength-converting, the method for regulating illuminant colour.

This material can use known material for transformation of wave length, for example can adopt to be converted to the fluorescence transformational substance of the light of other low-yield wavelength by the light that luminescent layer 12 sends.The kind of fluorescence transformational substance can be according to will suitably selecting by the light wavelength of target organic EL ejaculation with by the light wavelength that luminescent layer 12 sends.In addition, the use amount of fluorescence transformational substance can suitably be selected according to its kind in the scope that the concentration delustring does not take place, and is 10 with respect to transparent resin (uncured) ^-5-10 ^-4Be suitable about mol.Can only use a kind of fluorescence transformational substance, also can be used in combination multiple.During with multiple being used in combination,, except that blueness, green and red light, can also send the light of white light or Neutral colour according to the difference of its combination.The object lesson of fluorescence transformational substance has the material shown in following (a)-(c).

(a) by ultraviolet excitation, send the material of blue light

1, two (2-methyl ス チ リ Application) benzene of 4-, trans-4, Stilbene such as 4 '-diphenyl Stilbene are coumarin series pigments, 4 such as pigment, 7-hydroxy-4-methylcoumarin, pigments such as 4 '-two (2,2 '-diphenylacetylene) biphenyl.

(b) excite, send the material of green light by blue light

2,3,5,6-1H, 4H-tetrahydrochysene-8-trifluoromethyl quinolizino (9,9a, 1-gh) cumarin pigment such as cumarin etc.

(c) by the optical excitation of the wavelength of blue to green, send material by orange light to red wavelength

4-(dicyano methylene)-2-methyl-6-(to the dimethylamino styryl)-4H-pyrans, 4-(dicyano methylene)-2-phenyl-6-(2-(9-julolidine groups) vinyl)-4H-pyrans, 4-(dicyano methylene)-2,6-two (2-(9-julolidine groups) vinyl)-4H-pyrans, 4-(dicyano methylene)-2-methyl-6-(2-(9-julolidine groups) vinyl)-4H-pyrans, (2-(9-julolidine groups) vinyl)-cyanine such as 4H-thiapyran are pigment to 4-(dicyano methylene)-2-methyl-6-, 1-ethyl-2-(4-(to dimethylaminophenyl)-1, the 3-butadienyl)-pyridine-パ-コ ラ レ イ ト pyridines such as (pyridines 1) is a pigment, rhodamine B, xanthine such as rhodamine 6G are that pigment oxazine is a pigment etc.

Can obtain above-mentioned effect at luminescent layer 12 especially during for hole transport ability.

Luminescent layer 12 is a hole transport ability, and increase in the hole that does not then enter electronics injection transport layer 13 with electron recombination.Therefore, by not luminescent layer 13 is set, can greatly prolong component life on such organic EL.

" electronics injects transport layer 14 "

It is to be located at negative electrode 15 and the layer between the luminescent layer 13 not that electronics injects transport layer 14, be will be transferred to by negative electrode 15 injected electrons luminescent layer 13 not layer, make organic EL have above-mentioned character.

The electronics that is used to form material known that material that electronics injects transport layer 14 uses from the electronics injection material that can be used as photoconductive material or organic El device injects the material known that transport layer uses and selects material arbitrarily, can use electron affinity to be in the work content of negative electrode and the material between the electron affinity of luminescent layer 13 not usually.

Specifically can use 1, two [5 '-(to tert-butyl-phenyl)-1,3, the 4-oxadiazole-2 '-yl] benzene of 3-, 2-(4-xenyl)-5-(4-tert-butyl-phenyl)-1,3, oxadiazole derivatives such as 4-oxadiazole; 3-(4 '-tert-butyl-phenyl)-4-phenyl-5-(4 "-biphenyl)-1,2, triazole derivatives such as 4-triazole etc.Also can use heterocycle tetracarboxylic anhydride, carbodiimide, fluorenylidene methane Derivatives, anthraquinone bismethane derivative, anthracyclinone derivatives, diphenylethyllene pyrazines derivatives, phenanthroline derivatives etc. such as pyrrolotriazine derivatives, perylene derivative, quinoline, quinoxaline derivant, diphenyl quinone derivative, nitro substituted fluorene ketone derivatives, tetraphenylmethane derivative, titanium dioxide thiapyran derivative, anthraquinone bismethane derivative, titanium dioxide thiapyran derivative, Nai perylene.

Also can suitably select two (10-benzo [h] quinolinol) berylliums, the beryllium salt of 5-flavonol, the metal-organic complexs such as aluminium salt of 5-flavonol, especially preferably select the metal complex of oxine or derivatives thereof.Concrete example has: contain oxine and (be generally the metal-chelating oxine type compound of the chelate of 8-quinolinol or oxine, three (8-quinolinol) aluminium, three (5 for example, 7-two chloro-8-quinolinols) aluminium, three (5,7-two bromo-8-quinolinols) aluminium, three (2-methyl-8-quinolinol) aluminium etc.Also have central metal with these metal complexs to be replaced into indium, magnesium, copper, calcium, tin or plumbous metal complex etc.The preferred compound that uses no metal or metal phthalocyanine or their end to be replaced by alkyl, sulfuryl etc.

Electronics injects transport layer 14 and can only be formed by above-mentioned a kind of material, also multiple mixing can be formed.It can also be the sandwich construction that contains same composition or the different multilayers of forming.

Electronics injects transport layer 14 and uses above-mentioned materials, forms by known film build methods such as sputtering method or ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating methods.

Thickness is according to employed material and difference is generally 5nm-5 μ m.

Electronics injects transport layer 14 to be located at than luminescent layer 12 when more dipped beam takes out side, must be transparent for the light that is taken out.Therefore, be material transparent by forming that material that above-mentioned electronics injects transport layer 14 suitably is chosen in when making film above-mentioned light, be set at for the optical transmission rate of taking out bigger usually than 10%.

" negative electrode 15 "

Negative electrode 15 is to inject the electrode that transport layer 14 is injected electronics to electronics, in order to improve electron injection efficiency, adopts work content for example to be lower than the metal or alloy of 4.5eV, electric conductive compound and their mixture as electrode substance.

The example of above-mentioned electrode substance has: lithium, sodium, magnesium, silver, copper, aluminium, indium, calcium, tin, ruthenium, titanium, manganese, chromium, yttrium, aluminium-calcium alloy, aluminum-copper-lithium alloys, aluminium-magnesium alloy, magnesium-silver alloy, magnesium-indium alloy, lithium-indium alloy, sodium-potassium-sodium alloy, sodium-potassium-sodium alloy, magnesium/copper mixture, aluminium/alumina mixture etc.Also can use and can be used as the material that anode uses with material.

Negative electrode 15 is located at than luminescent layer 12 when more dipped beam takes out a side, is set at for the optical transmission rate of taking out greatlyyer than 10%, for example adopts the magnesium-transparent electroconductive oxide of indium alloy superimposed layer at ultrathin membrane and the electrode that forms etc.In this negative electrode, in order to prevent when the sputter electroconductive oxide organic luminous layer 31 grades, can inject at negative electrode 15 and electronics the resilient coating that is added with copper phthalocyanine etc. is set between the transport layer 14 by plasma damage.

During as the light reflective electrode, suitable selection possesses the material of the performance of the light that goes out to outside sphere in above-mentioned material, selects metal or alloy, metallic compound usually.

Negative electrode 15 can be formed separately by above-mentioned material, also can be formed by multiple material.For example, in magnesium, add silver or the copper of 1%-20%, perhaps in aluminium, add the lithium of 0.1-10 weight %, then can prevent the oxidation of negative electrode 15, and negative electrode 15 also improves with the tack that electronics injects transport layer 14.

Negative electrode 15 can be the sandwich construction that contains same composition or the different multilayers of forming.For example can make following structure.

For preventing the oxidation of negative electrode 15, inject the protective layer that the not contacted part setting of transport layer 14 contains the metal that corrosion stability is arranged at negative electrode 15 and electronics.

The material that forms this protective layer for example preferably uses silver or aluminium etc.

For reducing the work content of negative electrode 15, the interface portion of injecting transport layer 14 at negative electrode 15 and electronics is inserted the little oxide of work content or fluoride, metal, compound etc.

The material that for example uses negative electrode 15 inserts lithium fluoride or lithia as aluminium, interface portion.

Negative electrode 15 can form by known forming thin film methods such as vacuum vapour deposition, sputtering method, ionization vapour deposition method, ion plating method, electron beam evaporation plating methods.

Thickness about preferred 5-1000nm, about preferred especially 10-500nm, preferably is set at 50-200nm according to the material of employed electrode substance and difference is generally about 5nm-1 μ m.

The sheet resistance of negative electrode 15 is preferably set to hundreds of ohm/sheets or following.

" other layer, additive "

Layer shown in Figure 1 known layer in addition can be set in the organic EL of the present embodiment, can also in the layer that constitutes, add (doping) known additive (dopant) etc.For example following deformation program can be arranged.

＜be arranged at the layer of interlayer 〉

The layer that can be provided for improving the tack between layer and the layer or improve electronics injection or hole injection.

For example, be total to evaporation, obtain the cathode interface layer, it is located between above-mentioned two layers forming the material of negative electrode 15 and the material of formation electronics injection transport layer 14.Thus, can relax the energy barrier of the electronics injection that is present between luminescent layer 12 and the negative electrode 15.Can also improve the tack that negative electrode 15 and electronics inject transport layer 14.

Be used to form the material of cathode interface layer so long as the material that makes the cathode interface layer have above performance gets final product, be not particularly limited, all can adopt, also can use material known.For example can use fluoride, oxide, chloride, sulfide of alkali metal such as lithium fluoride, lithia, magnesium fluoride, calcirm-fluoride, strontium fluoride, barium fluoride, alkaline-earth metal etc.The cathode interface layer can be formed by independent material, also can be formed by multiple material.

Thickness is about 0.1nm-10nm, preferred 0.3nm-3nm.

The cathode interface layer can be to form uniform thickness in the cathode interface layer, also can inhomogeneously form, and can form island, can form by known forming thin film methods such as vacuum evaporations.

＜protective layer 〉

For preventing that organic EL from contacting with oxygen or moisture, protective layer (encapsulated layer, surface stabilization film) can be set.

The material that is used for protective layer for example has: high-molecular organic material, inorganic material, also have light-cured resin etc., the material that is used for protective layer can use separately, perhaps multiple being used in combination.Protective layer can be that single layer structure also can be a sandwich construction.

The example of high-molecular organic material has: the fluorine resins such as copolymer of chlorotrifluoroethylene polymer, dichloro fluoride polymer, chlorotrifluoroethylene polymer and dichloro fluoride polymer, acrylic resin such as polymethyl methacrylate, polyacrylate, epoxy resin, silicones, epoxy silicone, polystyrene resin, mylar, polycarbonate resin, polyamide, polyimide resin, polyamide-imide resin, Parylene resin, polyvinyl resin, polyphenylene oxide resin etc.

Inorganic material for example has diamond thin, amorphous silica, electrical insulating property glass, metal oxide, metal nitride, metal carbides, metal sulfide etc.

Can add above-mentioned fluorescence transformational substance in the above material.

Organic EL can also be encapsulated in the fluorohydrocarbon wet goods inert substance of for example paraffin, atoleine, silicone oil, fluorocarbon oil, interpolation zeolite and protect.

＜inject the doping of transport layer 14 to hole injection/transport layer 11, electronics 〉

Can inject luminous organic materials (dopant) such as transport layer 14 doping fluorescent materials or phosphor material to hole injection/transport layer 11 or electronics, make these layers also luminous.

＜alkali doped or alkali metal compound in the layer adjacent〉with negative electrode 15

When using metal such as aluminium in the negative electrode 15, in order to relax the energy barrier between negative electrode 15 and the organic luminous layer 31, can be in adjacent with negative electrode 15 layer alkali doped or alkali metal compound.By the metal or the metallic compound that add, organic layer is reduced, and generates anion, so the electronics injection improves the applied voltage reduction.The example of alkali metal compound has oxide, fluoride, lithium chelate etc.

" substrate 2 "

Substrate 2 is main tabular components of supporting organic EL.Because each layer that constitutes in the organic EL is extremely thin, therefore make form usually by the organic EL device of substrate 2 supportings.

Substrate 2 is members of lamination 3 organic ELs, therefore preferably has the plane flatness.

Substrate 2 is located at than luminescent layer 12 when more dipped beam takes out side, and it is transparent for the light that is taken out.

So long as have above-mentioned performance, substrate 2 can use known.Usually select ceramic substrate or plastic such as glass substrate, silicon substrate, quartz substrate.Also can use substrate that is formed with metal forming on metal substrate or the supporting mass etc.Can use the substrate that constitutes by the composite sheet that a plurality of substrate combination of the same race or not of the same race are formed.

Like this, the organic EL of the present embodiment can possess each formation of following (1)-(8), and other parts can suitably be out of shape.

(1) sets gradually luminescent layer, electronics injection transport layer and negative electrode on the anode at least, electronics injects between transport layer and the luminescent layer and is provided with the not formation of luminescent layer, and wherein the hole transport ability of luminescent layer is not injected the big of transport layer and possessed electron-transporting than above-mentioned electronics.

(2) in the formation of above-mentioned (1), the electron-transporting of the luminescent layer formation higher not than hole transport ability.

(3) in the formation of above-mentioned (1) or (2), luminescent layer does not contain the formation that hole transport ability is injected the big of transport layer than above-mentioned electronics and possessed the material of electron-transporting.

(4) in the formation of above-mentioned (1) or (2), luminescent layer does not contain one or more electron transporting material that possess electron-transporting, one or more possess the formation of injecting the hole transport ability material of the hole transport ability of transmitting floor height than electronics.

(5) in the formation of above-mentioned (4), at least a material in the electron transporting material is a formation of injecting at least a identical materials of the material that transport layer contains with electronics.

(6) in the formation of above-mentioned (4) or (5), at least a material in the hole transport ability material be with luminescent layer in the formation of at least a identical materials of the material that contains.

(7) in above-mentioned (4)-(6) in each the formation, the formation that the electron-transporting of electron transporting material is higher than the hole transport ability of hole transport ability material.

(8) in above-mentioned (1)-(7) in each the formation, in the luminescent layer, the formation that electron-transporting, hole transport ability are all high.

" other example "

Therefore, for example as shown in Figure 2, can with by use the of the same race of above-mentioned material or not a plurality of layers of constituting of same material carry out lamination, constitute not luminescent layer.Taked among Fig. 2 on the substrate 3 lamination anode 40 successively, hole injection/transport layer 41, luminescent layer 42, first not luminescent layer 430, second luminescent layer 431, electronics do not inject the formation of transport layer 44 and negative electrode 45.During this constitutes, remove first not luminescent layer 430 and second not the luminescent layer 431 layer be respectively with above-mentioned first embodiment in each layer equal layer.

As mentioned above, when constituting not luminescent layer, only otherwise the not luminescent layer in luminescent layer 430,431 and above-mentioned first embodiment similarly forms, then can obtain above-mentioned effect by multilayer.

As can be known: constitute second luminescent layer 431 not by single material such as three (8-quinolinol) aluminium, adopt to form second not the material of luminescent layer 431 (being three (oxine) aluminium in this example) as first electron transporting material of luminescent layer 430 not, adopt with luminescent layer 42 in the hole identical materials as the first hole transport ability material of luminescent layer 430 not, the component life of the organic EL of Xing Chenging is long therefrom, the luminous efficiency height.That is, as can be known: make constituting that hole transport ability reduces successively by inject transport layer 44 by luminescent layer 42 to electronics, perhaps inject transport layer 44 and make constituting that electron-transporting increases successively, can obtain good effect by luminescent layer 42 to electronics.

This can think: the energy gap that is injected each interlayer between the transport layer 44 by luminescent layer 42 to electronics is little also more influential for above-mentioned effect than the energy gap of each interlayer of element in the past.

As Fig. 3 or shown in Figure 4, constitute luminescent layer by multilayer, can form following formation: the peak of the light that is sent by a layer is different with the peak of the light that another layer at least sends.

In the formation shown in Figure 3, taked on the substrate 5 successively lamination anode 60, hole injection/transport layer 61, blue light-emitting layer 620, redness and green light emitting layer 621, luminescent layer 63, electronics inject the formation of transport layer 64 and negative electrode 65, by sending the light of red, green, blue, show white.During this constitutes, remove red and green light emitting layer 621 and the blue light-emitting layer 620 layer can be respectively with organic EL shown in Figure 1 in each layer formation equally.

Preferably be blue dopant with illuminant colour for example mix by being total to evaporation etc. with material of main part for blue light-emitting layer 620, than redness and green light emitting layer 620 more close negative electrode 65 1 sides formation.

Illuminant colour for example has: talan yl amine derivatives, pyrene derivatives, perylene derivative, anthracene derivant, benzoxazole derivative, benzothiazole derivant, benzimidizole derivatives, derivative, phenanthrene derivative, diphenylethyllene benzene derivative, tetraphenylbutadiene etc. for blue dopant can suitably adopt known blue-light-emitting dopant.

It is the known material of main part that uses in the organic EL luminescent layer of blue dopant that the material of main part of blue light-emitting layer 621 usefulness can suitably adopt having illuminant colour, for example has: diphenylethyllene arylene derivative, stilbene derivative, carbazole derivates, triarylamine derivative, two (2-methyl-8-quinolinol) (p-phenyl phenol) aluminium etc.

Red and green light emitting layer 621 is preferably by mixing illuminant colour to form for the dopant of redness and green dopant and material of main part are total to evaporation etc.

Illuminant colour is that red dopant and green dopant can be by suitably selecting in the known dopant.Illuminant colour for example has europium complex, 1-benzopyran derivatives, rhodamine derivative, benzothioxanthene derivative, derivatives of porphyrin, Nile red, 2-(1 for red dopant, the 1-dimethyl ethyl)-(2-(2 for 6-, 3,6,7-tetrahydrochysene-1,1,7,7-tetramethyl-1H, 5H-benzo (ij) quinolizine-9-yl) vinyl)-and 4H-pyrans-4H-subunit) malononitrile, 4-(dicyano methylene)-2-(methyl)-6-(to dimethyl-amino-styryl)-4H-pyrans etc.Illuminant colour for example has coumarin derivative, talan yl amine derivatives, quinacridone derivative etc. for green dopant.

The material of main part that uses in redness and the green light emitting layer 621 can suitably adopt the known material of main part that uses in having the luminescent layer of illuminant colour for the organic EL of red or green dopant, for example have: diphenylethyllene arylene derivative, the diphenylethyllene benzene derivative, the talan yl amine derivatives, quinolinolate is a metal complex, triarylamine derivative oxadiazole derivative, the sila cyclopentadiene derivant, the connection carbazole derivates, Oligopoly thiophene derivative, 1-benzopyran derivatives, triazole derivative benzoxazole derivative, benzothiazole derivant etc.Especially preferably use three (oxine) aluminium, N, N '-two (4 '-diphenyl amino-4-xenyl)-N, N '-diphenylbenzidine, 4,4 '-two (2,2 '-diphenylacetylene) biphenyl.

In the formation shown in Figure 4, taked on the substrate 7 successively lamination anode 80, hole injection/transport layer 81, blue light-emitting layer 820, red light emitting layer 821, green light emitting layer 822, luminescent layer 83, electronics inject the formation of transport layer 84 and negative electrode 85, by sending the light of red, green, blue, show white.During this constitutes, the layer except that blue light-emitting layer 820, red light emitting layer 821 and green light emitting layer 822 can be respectively with organic EL shown in Figure 1 in each layer formation equally.

Blue light-emitting layer 820, red light emitting layer 821 and green light emitting layer 822 can mix formation with the material of main part that is fit to this dopant with the dopant of above-mentioned each illuminant colour.

As Fig. 3 or shown in Figure 4, as can be known: by multilayer constitute luminescent layer, when constituting not luminescent layer by electron transporting material and hole transport ability material, the hole transport ability material then can obtain the long good organic EL of component life as the material of main part in the luminescent layer (green light emitting layer 822 among redness among Fig. 3 and green light emitting layer 621, Fig. 4) that joins with luminescent layer not.

Second embodiment

" layer constitutes "

The organic electroluminescent device of second embodiment forms red light emitting layer, blue light-emitting layer and negative electrode successively at least on anode, and this red light emitting layer contains the green light dopant.

Fig. 5 is that explanation forms anode 10, the figure of the organic electroluminescent device of hole injection layer 31, hole transmission layer 51, red light emitting layer 321, blue light-emitting layer 320, electron transfer layer 54, electron injecting layer 34 and negative electrode 15 successively on substrate 2.Below, with reference to Fig. 5, the organic electroluminescent device of second embodiment is specifically described.

" substrate 2 "

Substrate 2 is main tabular components of supporting organic electroluminescent device.Because each layer that constitutes in the organic electroluminescent device is extremely thin, therefore make form usually by the organic electroluminescent device of substrate 2 supportings.

Substrate 2 is members of lamination 3 organic electroluminescent devices, therefore preferably has the plane flatness.

When substrate 2 is located at light taking-up side, be transparent for the light that is taken out.

So long as have above-mentioned performance, substrate 2 can use known.Usually select ceramic substrate or plastic such as glass substrate, silicon substrate, quartz substrate.Also can use substrate that is formed with metal forming on metal substrate or the supporting mass etc.Can use the substrate that constitutes by the composite sheet that a plurality of substrate combination of the same race or not of the same race are formed.

" anode 10 "

Anode 10 is the electrodes to hole injection/transport layer 11 injected holes.Therefore, be used to form the material of anode 10, can select metal, alloy, electric conductive compound and their material known such as mixture usually so long as the material that makes anode 10 have this character gets final product.

The material that is used to form anode 10 for example has following material.

Metal oxide or metal nitrides such as ITO (indium-tin-oxide), IZO (indium-zinc oxide), tin oxide, zinc oxide, Zinc-aluminium, titanium nitride;

Metals such as gold, platinum, silver, copper, aluminium, nickel, cobalt, lead, chromium, molybdenum, tungsten, tantalum, niobium;

The alloy of these metals or the alloy of cupric iodide etc.,

Electroconductive polymers such as polyaniline, polythiophene, polypyrrole, polyphenylene vinylene, poly-(3 methyl thiophene), polyphenylene sulfide etc.

Anode 10 is located at than luminescent layer 12 when more dipped beam takes out side, and the optical transmission rate that is set at usually being got is bigger than 10%.Take out the light time of visible region, preferably use the high ITO of transmissivity in the visible region.

When using, can in above-mentioned material, suitably select to possess the material that the light that will be got reflexes to outside performance, select metal, alloy or metallic compound usually as reflection electrode.

Anode 10 can only be formed by a kind of of above-mentioned material, also multiple mixing can be formed.Can also be to contain the same composition or the sandwich construction of the multilayer of composition of the same race not.

When the resistance of anode 10 is high, auxiliary electrode can be set, to reduce resistance.Auxiliary electrode is the laminate of metals such as copper, chromium, aluminium, titanium, aluminium alloy or these metals and anode 10 parts and the electrode established.

Anode 10 uses above-mentioned materials, by known forming thin film methods such as sputtering method or ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating methods, forms on substrate 2.

Can also carry out the washing of ozone washing or oxygen plasma, UV washing, the work content on surface is increased.The short circuit or the defective that be to suppress organic EL take place, and the method for polishing after method that can be by making the particle diameter microminiaturization or the film forming is controlled to be 20nm or following with the root-mean-square value of surface roughness.

The thickness of anode 10 about preferred 10nm-1 μ m, about further preferred 10-500nm, about preferred especially 10nm-300nm, wishes to select in the scope of 10-200nm according to employed material and difference is generally about 5nm-1 μ m.

The sheet resistance of anode 10 is preferably set to hundreds of ohm/sheets or following, more preferably about 5-50 ohm/sheet.

" hole injection layer 31 "

Hole injection layer 31 is located between anode 10 and the hole transmission layer 51.Hole injection layer 31 is to be transferred to the layer of hole transmission layer 51 by anode 10 injected holes.The preferred 0.5nm-200nm of the thickness of hole injection layer 31, further preferred 7nm-150nm.The preferred reason of the thickness of scope like this is: but driving voltage is low and the projection of covered cathode etc.

Spendable material in the hole injection layer 31 is so long as make hole injection layer 31 have getting final product of above character, be not particularly limited, selecting arbitrarily in the material known of using the material known that can use from the hole-injecting material that can be used as photoconductive material or the hole injection layer of organic EL etc., material uses.The triaryl amine is for example arranged, the arlydene diamine derivative, phenylenediamine derivative, compound of styryl, 2,2-diphenylethlene based compound, derivatives of porphyrin etc., wherein preferred p-phenylene diamine derivative, 4,4 '-benzidine derivative, 4,4 '-diamino-diphenyl sulfane derivative, 4,4 '-diaminodiphenyl-methane derivative, 4,4-diamino-diphenyl ether derivant, 4,4 '-diaminourea tetraphenylmethane derivative, 4,4 '-diaminourea stilbene derivative, 1,1-diaryl cyclohexanes class, 4; 4 "-diaminourea terphenyl derivative, 5,10-two-(4-aminophenyl) anthracene derivant, 2,5-diaryl pyridines class, 2,5-diaryl furans, 2,5-diaryl thiophene-based, 2,5-diaryl pyrrole class, 2,5-diaryl-1,3,4-oxadiazole class, 4-(ammonia diaryl base) Stilbene class, 4,4 '-two (ammonia diaryl base) Stilbene class, N, N-diaryl-4-(2, the 2-diphenylacetylene) phenyl amines, 1,4-two (4-aminophenyl) naphthalene derivatives, 2,8-two (ammonia diaryl base)-5-thioxanthene class, 1,3-two (ammonia diaryl base) isoindoles etc.Further preferred three [4-[N-(3-aminomethyl phenyl)-N-phenyl amino] phenyl] amine, three [4-[N-(2-naphthyl)-N-phenyl amino] phenyl] amine, porphyrin-copper complex etc.

Hole injection layer 31 can use known film build methods such as sputtering method, ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, and these materials are become film production on anode 10.

" hole transmission layer 51 "

Hole transmission layer 51 is arranged between hole injection layer 31 and the red light emitting layer 321.Hole transmission layer 51 be will by the hole transport of hole injection layer 31 transmission to red light emitting layer 321 layer.

The thickness of this hole transmission layer 51 is preferably 0.5nm-1000nm, further preferred 10nm-800nm.

Can be used for hole transmission layer 51 material so long as the high material of hole transport performance get final product, for example have: three amines, tetraamine, diphenyl amine, the triaryl amine, the aryl diamine derivative, phenylenediamine derivative, the p-phenylene diamine derivative, the m-phenylene diamine (MPD) derivative, 1, two (the 4-ammonia diaryl base phenyl) cyclohexanes of 1-, 4,4 '-two (ammonia diaryl base) biphenyl class, two [4-(ammonia diaryl base) phenyl] methane class, 4; 4 "-two (ammonia diaryl base) Terphenyls, 4,4 -two (ammonia diaryl base) quaterphenyl class, 4,4 '-two (ammonia diaryl base) diphenyl ether, 4,4 '-two (ammonia diaryl base) diphenyl sulfane class, two [4-(ammonia diaryl base) phenyl] dimethyl methyl alkanes, two [4-(ammonia diaryl base) phenyl]-two (trifluoromethyl) methane class etc., preferred aryl groups-two (4-ammonia diaryl base phenyl) amine wherein, 4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl, 31 materials that preferably exemplify of hole injection layer.

Hole transmission layer 51 can use known film build methods such as sputtering method, ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, and these materials are become film production on hole injection layer 31.

" red light emitting layer 321 "

Red light emitting layer 321 is located between hole transmission layer 51 and blue light-emitting layer 320 or the luminous regulating course, contains the green light dopant.Therefore, in the glow dopant and the green light dopant of this red light emitting layer 321,, become excitation state, when it returns back to ground state, send red and green light by anode 10 and negative electrode 15 difference injected holes and electron recombination.The preferred 0.5nm-50nm of the thickness of red light emitting layer 321, further preferred 1nm-20nm.

The green light dopant that contains in the red light emitting layer 321 is so long as have the dopant of green luminescence property and get final product, being not particularly limited, for example can be that coumarin derivative, quinacridone derivative, quinolinolate are metal complex, talan yl amine derivatives etc.Coumarin derivative has excellent especially green emitting function, thereby preferred.Further preferred 6-(alkyl or do not have replacement)-8-(alkyl or do not have replacement)-7-amino-3-aryl-4-(trifluoromethyl or do not have replacement) coumarin derivative.Particularly consider the conjugation of the pi-electron of 3 aryl of cumarin parent nucleus and cumarin parent nucleus, the group of preferred benzothiazole-2-base, benzimidazolyl-2 radicals-Ji, benzoxazole-2-base, benzo selenazoles-2-base etc., the phenyl ring part in these aryl can also further be substituted.The green light dopant preferably contains the 0.1-15 weight portion with respect to 100 weight portion hole transport ability material of main parts.As long as in this scope, just can obtain excellent whiteness.

Red light emitting layer 321 contains the hole transport ability material of main part.Therefore, can make red light emitting layer 321 have the hole transport function of hole transmission layer 51.Here, as long as employed hole transport ability material of main part has the hole transport function, be not particularly limited, for example can enumerate diphenyl amine, three amines, tetraamine, the triaryl amine, 4,4 '-two (ammonia diaryl base) biphenyl class, the p-phenylene diamine derivative, the m-phenylene diamine (MPD) derivative, 1, two (the 4-ammonia diaryl base phenyl) cyclohexanes of 1-, 4,4 '-two (ammonia diaryl base) biphenyl class, aryl-two (4-ammonia diaryl base phenyl) amine, diphenylethyllene arylene class, the diphenylethyllene benzene class, the talan yl amine derivatives, quinolinolate is a metal complex, azomethine class oxadiazole class, the pyrazolo quinolines, the sila cyclopentadiene, the naphthalene class, the anthracene class, connection carbazole derivates perylene class, the Oligopoly thiophene class, Coumarins, pyrene derivatives, four aryl butadiene types, benzo pyran, europium complex, the rubrene class, quinacridone derivative, triazole type Benzooxazole kind, benzothiazoles, 4 aggressiveness of triarylamine etc.Wherein, preferred 4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl, 4,4 '-two [N-(3-aminomethyl phenyl)-N-phenyl amino] biphenyl, three (oxine) aluminium, 4,4 '-two (2,2 '-diphenylacetylene) biphenyl, 31 materials that preferably exemplify of hole injection layer etc.

Preferred red light emitting layer 321 contains at least a red dopant.Can further improve the whiteness of organic electroluminescent device thus.

As long as the red dopant that contains in the red light emitting layer 321 has the emitting red light function, be not particularly limited, the anthracene class is for example arranged, aphthacene, pentacene, the pyrene class, europium complex, benzo pyran, 4-(methylene that bielectron attracts base to replace)-4H-pyrans class, 4-(methylene that bielectron attracts base to replace)-4H-thiapyran class, the rhodamine class, the benzothioxanthene class, derivatives of porphyrin; phenoxazine ketone, ペ リ Off ラ Application テ Application class etc., wherein preferred 7-diethylamino benzo [a] phenoxazine-9H-3-ketone, [the 2-tert-butyl group-6-[is trans-2-(2,3,5,6-tetrahydrochysene-1,1,7,7-tetramethyl-benzo [i, j] quinolizine-9-yl) vinyl]-4H-pyrans-4-subunit]-1, the 3-malononitrile, [2-methyl-6-[is trans-2-(2,3,5,6-tetrahydrochysene-1,1,7,7-tetramethyl-benzo [i, j] quinolizine-9-yl) vinyl]-4H-pyrans-4-subunit]-1, the 3-malononitrile, dibenzo tetraphenyl ペ リ Off ラ Application テ Application etc.With respect to 100 weight portion hole transport ability material of main parts, preferably contain the red dopant of 0.1-15 weight portion.As long as in this scope, just can obtain excellent whiteness.

The hole mobility of preferred red light emitting layer 321 is bigger than the hole mobility of blue luminescent layer 320.Thus, can improve luminous efficiency.

Hole mobility for example can be learnt by flight time (TOF) method.In this TOF method, to the sample surfaces irradiating pulsed light that has applied voltage, the transient current of generation, voltage and this sample thickness that is applied on this sample can be calculated hole mobility (unit: cm when (in the layer) was mobile in this sample by the hole that produces by this pulsed light ²/ Vs).Specifically, making will be measured the independent film (for example film about 10-20 μ m) of the layer of hole mobility, measures hole mobility with this film.In the scope of the electric field strength that the condition of the intensity of the electric field that is added when measuring hole mobility is added when being in the organic EL practical application.

Red light emitting layer 321 can use sputtering method, ion plating method, vacuum vapour deposition method, spin-coating method, electron beam known film build methods such as vapour deposition method altogether altogether, with these materials film forming and making on hole transmission layer 51.

" luminous regulating course "

Preferably between red light emitting layer 321 and following blue light-emitting layer 320, luminous regulating course is set.This luminous regulating course can further improve the luminous intensity equilibrium of red, green, blue by block electrons.The preferred 0.1nm-30nm of the thickness of this luminous regulating course.Further preferred 0.5-20nm.As long as in this scope, then can obtain excellent whiteness.

The material that can be used for luminous regulating course can use the material of block electrons such as hole transport ability material, its example has: triaryl amine, 4,4 '-benzidine derivative, 31 materials that preferably exemplify of hole injection layer etc., wherein because 4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl has excellent especially electronics barrier properties, thereby preferred.

Luminous regulating course can use known film build methods such as sputtering method, ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, and these materials are become film production on red light emitting layer 321.

" blue light-emitting layer 320 "

Blue light-emitting layer 320 is located between red light emitting layer 321 or luminous regulating course and the electron transfer layer 54.In the blue light-emitting layer 320,, become excitation state, send blue light when it returns back to ground state by anode 10 and negative electrode 15 difference injected holes and electron recombination.The material that can be used for blue light-emitting layer 320 can be selected arbitrarily from material known with blue luminescent properties etc., and material uses.

The thickness of the Film Thickness Ratio red light emitting layer 321 of preferred this blue light-emitting layer 320 is thick.Thus, can further improve the equilibrium of color.The thickness of blue light-emitting layer 320 is preferably 1.1 times-8 times of thickness of red light emitting layer 321, more preferably 1.2 times-6 times.More particularly, the thickness of blue light-emitting layer 320 is preferably 0.6nm-70nm, further preferred 5nm-60nm.

Blue light-emitting layer 320 preferably contains bipolarity material of main part and blue dopant.Can luminous efficiency send blue light well thus.

Can be used for blue light-emitting layer 320 the bipolarity material of main part so long as the high material of hole transport performance and electronic transmission performance get final product, for example have: diphenylethyllene arylene class, Stilbene class, carbazole derivates, triaryl amine, two (2-methyl-8-quinolinol) (p-phenyl phenol) aluminium, 4,4 '-two (2,2-diarylethene base) biphenyl class etc.

Has blue luminescent properties as long as can be used for the blue dopant of blue light-emitting layer 320, be not particularly limited, for example have: pyrene Lei, perylene class, anthracene class, diphenylethyllene amine, Benzooxazole kind, quinolinolate are metal complex, benzothiazoles, benzimidazole, class, luxuriant and rich with fragrance class, diphenylethyllene benzene class, diphenylethyllene arylene class, divinyl arylene class, triphenylethylene base arylene class, triaryl-ethylene class, four aryl butadiene types etc.The doping of this blue dopant is preferably red dopant and green dopant 2 times-40 times according to weight ratio, further preferred 5 times-30 times.As long as in this scope, the emitting red light that just can obtain the green emitting of green dopant and red dopant is realized the blue-light-emitting of balanced intensity, by these luminous white lights that obtains excellence.

Blue light-emitting layer 320 can use known film build methods such as sputtering method, ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, by these materials film forming on red light emitting layer 321 or above-mentioned luminous regulating course is made.

" electron transfer layer 54 "

Electron transfer layer 54 is located between blue light-emitting layer 320 and the electron injecting layer 34.Electron transfer layer 54 is to be transferred to the layer of blue light-emitting layer 320 by electron injecting layer 34 electrons transmitted.The preferred 1-50nm of the thickness of electron transfer layer 54, more preferably 10-40nm.

Electron transfer layer 54 can be one deck structure, but considers from the interactional angle such as multiple polymers or the formation of CT complex compound of being excited that reduces electric transmission layer material and blue-light-emitting layer material, is preferably double-decker.Can prolong the life-span of organic electroluminescent device thus.

When electron transfer layer 54 is one deck structure, can suitably select electron transporting material according to desired luminous efficiency of organic electroluminescent device or component life.Specifically, consider that from the angle that improves luminous efficiency electron transporting material is preferably used the high electric transmission layer material of electron mobility; Consider from prolonging component life, preferably use the low electron transporting material of electron mobility.

When electron transfer layer 54 was double-decker, preferably that electron mobility is high electron transfer layer material configuration was in electron injecting layer 34 1 sides, and the electron transfer layer material configuration that electron mobility is low is in blue light-emitting layer 320 1 sides.Thus, the electric transmission layer material that electron mobility is low is shouldered pooling feature, can reduce high electric transmission layer material of electron mobility and the above-mentioned interaction between the blue-light-emitting layer material like this, keeps luminous efficiency, prolongs component life.At this moment, the thickness that contains the layer of the low electron transport material of electron mobility be preferably the layer that contains the high electron transport material of electron mobility thickness 0.1-2 doubly.

Here, the electric transmission layer material that electron mobility is low has: metal phenates, quinolinolate is a metal complex, triazole derivative oxazole derivative oxadiazole derivative, quinoxaline derivant, quinoline, azole derivatives, the benzopyrrole derivative, the tetraphenylmethane derivative, pyrazole derivatives, thiazole, benzothiazole derivant, thiadiazoles derivative, the benzo-thiophene derivative, the spiral shell based compound, imdazole derivatives, benzimidizole derivatives, diphenylethyllene benzene derivative etc., wherein preferred three (oxine) aluminium, two (2-methyl-8-quinolinol) (p-phenyl phenol) aluminium.The electric transmission layer material that electron mobility is high has: the phenanthroline derivative, the phenanthroline derivative, triazole derivative oxazole derivative oxadiazole derivative, quinoxaline derivant, the sila cyclopentadiene derivant, quinoline, azole derivatives, the benzopyrrole derivative, the tetraphenylmethane derivative, pyrazole derivatives, thiazole, the triphenyl methane derivative, benzothiazole derivant, thiadiazoles derivative, the benzo-thiophene derivative, the spiral shell based compound, imdazole derivatives, benzimidizole derivatives, diphenylethyllene benzene derivative etc., wherein preferred 2,9-dimethyl-4,7-diphenyl phenanthroline.They can suitably use alone or in combination.

Electron transfer layer 54 can use known film build methods such as sputtering method, ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, by above-mentioned material film forming on blue light-emitting layer 320 is made.

" electron injecting layer 34 "

Electron injecting layer 34 is located between negative electrode 15 and the electron transfer layer 54.Electron injecting layer 34 is to form the cathode interface layer, easily the layer that electronics is injected to electron transfer layer 54 by negative electrode 15.The preferred 0.1nm-3nm of the thickness of electron injecting layer 34, further preferred 0.2nm-1nm.

The material that makes electron injecting layer 34 have above-mentioned performance can be used for the material of electron injecting layer 34 so long as can adopt, be not particularly limited, alkali metal such as lithium, sodium, caesium are for example arranged, alkaline-earth metal such as strontium, magnesium, calcium, the fluoride of alkali metal compounds such as lithium fluoride, lithia, magnesium fluoride, calcirm-fluoride, strontium fluoride, barium fluoride, alkaline-earth metal, oxide, chloride, sulfide etc.Preferred fluorinated lithium wherein.Electron injecting layer 34 can be formed by independent material, also can be formed by multiple material.

Electron injecting layer 34 can use known film build methods such as sputtering method, ion plating method, vacuum vapour deposition, spin-coating method, electron beam evaporation plating method, by these materials film forming on electron transfer layer 54 is made.

" negative electrode 15 "

Negative electrode 15 is the electrodes that inject electronics to electron injecting layer 34, in order to improve electron injection efficiency, can adopt work content for example to be lower than the metal or alloy of 4.5eV, electric conductive compound and their mixture as electrode substance.

The example of above-mentioned cathode material has: lithium, sodium, magnesium, silver, copper, aluminium, indium, calcium, tin, ruthenium, titanium, manganese, chromium, yttrium, aluminium-calcium alloy, aluminum-copper-lithium alloys, aluminium-magnesium alloy, magnesium-silver alloy, magnesium-indium alloy, lithium-indium alloy, sodium-potassium-sodium alloy, sodium-potassium-sodium alloy, magnesium/copper mixture, aluminium/alumina mixture etc.Also can use and can be used as the material that anode uses with material.Wherein preferred aluminium.

Negative electrode 15 is located at than red light emitting layer 321 and blue light-emitting layer 320 when more dipped beam takes out side, generally be set at for the optical transmission rate of taking out greatlyyer, for example can adopt magnesium-transparent electroconductive oxide of silver alloy superimposed layer and the electrode that forms etc. at ultrathin membrane than 10%.In this negative electrode 15, when the sputter electroconductive oxide, in order to prevent that luminescent layer etc. by plasma damage, can be provided with the resilient coating that is added with copper phthalocyanine etc. between negative electrode 15 and electron injecting layer 34.

When using, can in above-mentioned material, suitably select to possess the material that the light that will take out reflexes to outside performance, select metal or alloy, metallic compound usually as the light reflective electrode.

Negative electrode 15 can be formed by independent above-mentioned material, also can be formed by multiple material.For example, in magnesium, add silver or the copper of 1-20 weight %, perhaps in aluminium, add the lithium of 0.1-10 weight %, then can prevent the oxidation of negative electrode 15, and the caking property of negative electrode 15 and electron injecting layer 34 improves also.

Negative electrode 15 can be the sandwich construction that contains same composition or the different multilayers of forming.For example can make following structure.

For preventing the oxidation of negative electrode 15, the part setting of not joining at negative electrode 15 and electron injecting layer 34 contains the protective layer of corrosion stability metal.

The material that is used to form this protective layer for example can preferably use silver or aluminium etc.

Negative electrode 15 can pass through known forming thin film methods such as vacuum vapour deposition, sputtering method, ionization vapour deposition method, ion plating method, electron beam evaporation plating method, forms on electron injecting layer 34 or this protective layer.

The thickness of negative electrode 15 (thickness that does not comprise protective layer) about preferred 5-700nm, about preferred especially 10-500nm, preferably is set at 50-200nm according to employed electrode material and difference is generally about 5nm-1 μ m.

The sheet resistance of negative electrode 15 is preferably set to hundreds of ohm/sheets or following.

As mentioned above, the organic EL in second embodiment can possess each formation of following (9)-(13), and other parts can suitably be out of shape.

(9) set gradually hole transmission layer, organic luminous layer and negative electrode on the anode at least, above-mentioned organic luminous layer sets gradually red light emitting layer and blue light-emitting layer by hole transmission layer one side, and red light emitting layer contains the formation of green dopant.

(10) in the formation of above-mentioned (9), be provided with the formation of luminous regulating course between red light emitting layer and the blue light-emitting layer.

(11) in the formation of above-mentioned (9) or (10), the formation that the thickness of blue light-emitting layer is bigger than the thickness of red light emitting layer.

(12) in above-mentioned (9)-(11) in each the formation, red light emitting layer contains the formation of hole transport ability material, red dopant and green dopant.

(13) in above-mentioned (9)-(12) in each the formation, the formation that the hole mobility of red light emitting layer is higher than the hole mobility of blue luminescent layer.

(14) in above-mentioned (9)-(13) in each the formation, blue light-emitting layer contains at least a blue dopant that is selected from talan yl amine derivatives, pyrene class, perylene class, anthracene class, Benzooxazole kind, benzothiazoles, benzimidazole, class, luxuriant and rich with fragrance class, diphenylethyllene benzene class and four aryl butadiene types, with at least a diphenylethyllene arylene class, Stilbene class, carbazole derivates, triaryl amine, two (2-methyl-8-quinolinol) (p-phenyl phenol) aluminium and 4 of being selected from, the bipolarity material of main part of 4 '-two (2,2 '-diphenylacetylene) biphenyl.

The colour display device that uses above-mentioned organic electroluminescent device as shown in Figure 6 and Figure 7.

Fig. 6 is the summary pie graph that the integral body of colour display device 101 constitutes.Colour display device 101 is made of controller 102, data driver 103, scanner driver 104 and organic electroluminescence panel 105.

The controller 102 of colour display device 101 is connected with scanner driver 104 with data driver 103.Controller 102 will be used for showing that according to the video data and the control signal of input the shows signal (sweep signal) of video data outputs to data driver 103 and scanner driver 104 on organic electroluminescence panel 105.

Data driver 103 is connected with the anode 107 that forms on organic electroluminescence panel 105, and scanner driver 104 is connected with the negative electrode 108 that forms on organic electroluminescence panel 105.Data driver 103 built-in constant current drive circuits 106.

Below, organic electroluminescence panel 105 is described.Fig. 7 is the schematic sectional view along the organic electroluminescence panel 105 of negative electrode 108.As shown in Figure 7, organic electroluminescence panel 105 possesses transparent substrates 109, the organic electroluminescent device 110 that forms on the surface of transparent substrates 109, is located at the colour filter (CF) 112 between transparent substrates 109 and the organic electroluminescent device 110.

Data driver 103 carries out switch transition according to shows signal, makes the pixel of organic electroluminescence panel 105 luminous, by constant current drive circuit 106, and via anode 107, will be corresponding to the electric current supply organic electroluminescent device 110 of shows signal.Scanner driver 104 is connected with negative electrode 108 permanent power supplys (for example ground connection) corresponding to shows signal.Thus, the electric current that injects in organic electroluminescent device 110 is corresponding to the brightness of shown video data.

Colour filter 112 with organic electroluminescent device 110 on certain position, with the state configuration corresponding with organic electroluminescent device 110, luminous removing direction is protection (カ バ-) plate 111 1 sides.

Protective plate 111 is fixed on the substrate via sheet material 113.That is, organic electroluminescent device 110 is surrounded by substrate 109, sheet material 113 and protective plate 111.

Organic electroluminescent device 110 can use the organic electroluminescent device of second embodiment.Organic electroluminescent device 110 except that the face relative with substrate 109, all protected film 115 overlay films.Diaphragm 115 is by preventing that the material that moisture sees through from forming.

Anode 107 forms a plurality of parallel striateds on the surface of substrate 109.Among Fig. 7, anode 107 extends to form along the direction vertical with paper.Organic electro luminescent layer 114 forms a plurality of parallel stripes shapes that extend along the direction that intersects vertically with anode 107.

Negative electrode 108 be stacked on the organic electro luminescent layer 114 that forms striated above, form the state that intersects vertically with anode 107.Constitute the pixel of organic electroluminescent device 110, in the cross section of anode 107 and negative electrode 108, become rectangular and be configured on the substrate 109.Luminous for transmissive organic electro luminescent layer 114, negative electrode 108 forms transparent.

It is wide that the R of organic electroluminescent device 110 (ruddiness), G (green glow), B (blue light) have the half value of the glow peak wavelength of 580nm-680nm and 10nm-140nm respectively, the glow peak wavelength of 510nm-550nm and the half value of 10nm-140nm are wide, and the half value of the glow peak wavelength of 440nm-490nm and 10nm-140nm is wide.

The R of colour filter 112 (red), G (green), B (indigo plant) pixel (not shown) have the transmission peaks wavelength that 560nm makes progress respectively, the half value of the transmission peaks wavelength of 510nm-550nm and 140nm or following (for example 80nm-140nm) is wide, and the half value of the transmission peaks wavelength of 450nm-490nm and 140nm or following (for example 80nm-140nm) is wide.

Glow peak wavelength with organic electroluminescent device 110 is the center, as the light-emitting zone of the organic electroluminescent device 110 of the scope of the wide increase and decrease of half value that makes this glow peak wavelength to be included in transmission peaks wavelength with colour filter 112 be the center, in the regional transmission as the colour filter 112 of the scope of the wide increase and decrease of half value that makes this transmission peaks wavelength.About the transmission peaks wavelength of R (red) pixel of colour filter 112,560nm upwards is meant the light that can comprise any wavelength longer than 560nm.The wavelength longer than 560nm only since the low energy of light that has than the wavelength of 560nm cause.Only so set the lower limit of wavelength, so wide not special setting of half value.

Then, the effect to above-mentioned colour display device 101 describes.Controller 102 outputs to data driver 103 and scanner driver 104 according to the video data and the control signal of input with shows signal.Based on the shows signal by controller 102 outputs, constant current drive circuit 106 injects the electric current corresponding to video data between the anode 107 for the treatment of luminous component and negative electrode 108.The white light that sends according to the electric current that injects sees through colour filter 112, is penetrated by protective plate 111 1 sides.After white light sees through R (red), G (green), B (blueness) pixel of colour filter 112, become the light of corresponding color.By the combination of R (red), G (green), B (blueness) pixel, can reproduce desirable color.

The characteristics of luminescence by making organic electroluminescent device 110 and the transmissison characteristic of colour filter 112 are in aforementioned range, and the emission wavelength scope of every kind of color is contained in the scope of transmission peak wavelength, therefore can obtain beautiful color development effectively.

In the above-mentioned embodiment, colour filter 112 can use inorganic colour filter, also can use organic color filters.In the above-mentioned embodiment, colour display device 101 is realized by the passive matrix mode, also can make arbitrary electrode side have switching function, and realize by the active matrix mode.

Then, for the liquid crystal display device of above-mentioned organic electroluminescent device as use backlight described.As shown in Figure 9, liquid crystal display device 200 contains liquid crystal panel 201 and backlight 202.Liquid crystal panel 201 is known, has a plurality of pixels, and corresponding each pixel is respectively equipped with R (red), G (green), B (blueness) colour filter (not shown).The voltage that the electrode that is provided with by the adjusting holding liquid crystal applies is regulated the amount by the light of each pixel.Here, the transmission peaks wavelength that the preferred respectively 560nm of the characteristic of R, G, B colour filter makes progress, the half value of the transmission peaks wavelength of 510nm-550nm and 140nm or following (for example 80nm-140nm) is wide, and the half value of the transmission peaks wavelength of 450nm-490nm and 140nm or following (for example 80nm-140nm) is wide.

Backlight 202 are made of the organic electroluminescent device shown in second embodiment.Constitute backlight 202 organic electroluminescent device along direction downward among Fig. 9; lamination transparency electrode anode 204, organic layer 205, metal electrode negative electrode 206 successively on transparent substrates 203; its arranged outside diaphragm 207, the electrode of protection organic electroluminescent device or organic compound and outside moisture or oxygen are isolated.

Anode 204, organic layer 205, negative electrode 206 all form with the substrate size roughly the samely, and electric current is flow through to negative electrode 206 by anode 204, and then all element is simultaneously luminous.

As the record of second embodiment, organic layer 205 has red luminescent layer and blue luminescent layer at least, and red luminescent layer contains green light-emitting dopant.Injection current, then organic layer 205 promptly emits white light.This is luminous, and to have the half value of the glow peak wavelength of following characteristic: 580nm-680nm and 10nm-140nm wide, and the glow peak wavelength of 510nm-550nm and the half value of 10nm-140nm are wide, and the half value of the glow peak wavelength of 440nm-490nm and 10nm-140nm is wide.

Effect for the liquid crystal display device 200 of such formation describes.To the signal of liquid crystal panel 201 inputs from not shown liquid crystal panel drive, according to this signal, the light transmission in each pixel of liquid crystal panel 201 is determined.Simultaneously, the anode 204 from backlight 202 is to negative electrode 206 injection currents, and backlight 202 send white light.Be incident to liquid crystal panel 201 by backlight 202 light that send, reach observer's eyes by each pixel and colour filter.At this moment, be adjusted in the amount of the light that passes through in the pixel of liquid crystal panel 201, further the light wavelength zone of being passed through by the colour filter restriction.Like this, whole liquid crystal display device shows required image etc.

In such liquid crystal display device 200, the transmissison characteristic of the colour filter by making liquid crystal panel 201 and the characteristics of luminescence that constitutes backlight 202 organic electroluminescent device are within above-mentioned scope, emission wavelength scope then of all kinds is contained in the scope of transmission peak wavelength, can obtain beautiful color development effectively.

[embodiment]

Following notebook inventive embodiment and comparative example, but the present invention of course not limits and is interpreted as following example.

＜embodiment 1 〉

Preparation is formed with the clear glass (substrate) 1 of anode 10 (the ITO layer of thickness 250nm) on a face, carry out the substrate washing.The washing of substrate is to carry out alkali cleaning, pure water washing successively, carries out the ultraviolet and ozone washing after the drying.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on the anode 2 of the glass 1 that has carried out the substrate washing, make the N shown in the following formula (1) of 50nm thickness, N '-two (4 '-diphenyl amino-4-xenyl)-N, the layer of N '-diphenylbenzidine, with this layer as hole injection/transport layer 11.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on hole injection/transport layer 11 shown in the following formula (2) of the 30nm thickness of the common evaporation of making 4,4 '-two (2,2 '-diphenylacetylene) 4 shown in biphenyl (93.0 weight %) and the following formula (3), 4 '-(two (9-ethyls-3-carbazyl ethenylidene)-1, the layer of 1 '-biphenyl (7.0 weight %) is a luminescent layer 12 with this layer.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on luminescent layer 12 shown in three (oxine) aluminium (37 weight %) shown in the following formula (4) of the 5nm thickness of the common evaporation of making and the following formula (2) 4, the layer of 4 '-two (2,2 '-diphenylacetylene) biphenyl (63 weight %) is luminescent layer 13 not with this layer.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on luminescent layer 13 not, make 2 shown in the following formula (5) of 15nm thickness, two (6 '-(2 ', 2 "-bipyridyl))-1 of 5-, 1-dimethyl-3, the layer of 4-diphenyl sila cyclopentadiene is an electronics injection transport layer 14 with this layer.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), injecting the lithium fluoride layer that forms the 0.5nm thickness on the transport layer 14 at electronics, is the cathode interface layer with this layer.

(evaporation rate is 1nm/s, vacuum degree about 5.0 * 10 by the tungsten boat ^-5Pa), injecting the aluminium lamination that forms the 150nm thickness on the transport layer 14 at electronics, is negative electrode 15 with this layer, makes organic electroluminescent device.

The organic electroluminescent device of making is emitted (キ セ Star プ) encapsulation with glass, connect anode 10 and negative electrode 15, measure 1600cd/m by known drive circuit ²Electrical power under the brightness (lm/W) and original intensity partly decline the life-span, and (brightness becomes 2400cd/m ²The time time, hr), wherein original intensity life-span of partly declining is to continue to flow through original intensity is decided to be 4800cd/m ²The time electric current the time partly decline the life-span.Brightness is measured with brightness tester (manufacturing of the ト プ コ of Co., Ltd. Application, trade name BM7).Measurement result is as shown in table 1.

＜comparative example 1 〉

In the comparative example 1, except that luminescent layer 13 is not set not, make organic EL similarly to Example 1.For the organic EL of making, measure electrical power similarly to Example 1 and original intensity partly declines the life-span.Measurement result is as shown in table 1.

＜embodiment 2-6 〉

Among the embodiment 2-6, the adding proportion of three (oxine) aluminium in the luminescent layer is not become 9 weight %, 15 weight %, 40 weight %, 50 weight %, 65 weight % respectively, in addition make organic EL similarly to Example 1.For the organic EL of making, measure electrical power similarly to Example 1 and original intensity partly declines the life-span.Measurement result is as shown in table 1.

＜embodiment 7-8 〉

Among the embodiment 7-8, make the thickness of luminescent layer 12 become 30nm, the thickness of luminescent layer 13 does not become 25nm, 20nm, in addition makes organic EL similarly to Example 1.For the organic EL of making, measure electrical power similarly to Example 1 and original intensity partly declines the life-span.Measurement result is as shown in table 2.

＜embodiment 9 〉

Among the embodiment 9, three (oxine) aluminium in the luminescent layer 13 is not become 2 shown in above-mentioned (5), 5-two (6 '-(2 '; 2 "-bipyridyl))-1,1-dimethyl-3, in addition 4-diphenyl sila cyclopentadiene makes organic EL similarly to Example 1.For the organic EL of making, measure electrical power similarly to Example 1 and original intensity partly declines the life-span.Measurement result is as shown in table 3.

Table 1:Alq3 doping and electrical power partly decline the life-span

	Alq3 doping (w%)	Electrical power (1m/W)	(hr) partly declines the life-span
				Embodiment 1	37	9.61	238
Embodiment 2	9	10.02	125
				Embodiment 3	15	9.61	133
Embodiment 4	40	8.89	220
				Embodiment 5	50	8.14	300
Embodiment 6	65	7.67	350
				Comparative example 1	0	10.4	67

Table 2: the thickness of luminescent layer 13 and electrical power partly do not decline the life-span

	Luminescent layer thickness (nm) not	Electrical power (1m/W)	(hr) partly declines the life-span
				Embodiment 4	5	8.89	220
Embodiment 7	15	8.30	243
				Embodiment 8	30	8.01	275
Comparative example 1	0	10.4	67

Table 3: material and the electrical power that contains in the luminescent layer 13 partly do not decline the life-span

	Luminescent layer dopant not	Electrical power (1m/W)	(hr) partly declines the life-span
				Embodiment 1	37w％Alq3	9.61	238
Embodiment 9	37w% following formula (5)	10.9	146
				Comparative example 1	Do not have	10.4	67

Among each embodiment, measure electron mobility and the hole mobility that not luminescent layer 13 and electronics inject transport layer 14 by the TOF method.The result shows: luminescent layer 13 does not possess electron-transporting, and hole transport ability is injected the height of transport layer 14 than electronics.Measure the spectrum of the organic EL of making by above-mentioned brightness tester, do not see luminous (spike is long) of material contained in the luminescent layer 13 not.

＜estimate

By implementing 1-9 and comparative example 1 as can be known, the situation of luminescent layer 13 compares for luminescent layer 13 being set not and not being provided with not, and electrical power does not almost change, the original intensity life-span prolongation that partly declines.

By embodiment 1-6 and comparative example 1 as can be known: increase the not hole mobility of luminescent layer 13, then electrical power does not almost change, and original intensity life-span of partly declining prolongs.Measure by the TOF method, in the not luminescent layer 13 of embodiment 6, electron-transporting is bigger than hole transport ability.

By the electron mobility and the hole mobility of TOF method mensuration three (oxine) aluminium, as can be known: it possesses electron-transporting, and hole transport ability is injected the height of transport layer than electronics.By this result and embodiment 1-8 and comparative example 1 as can be known: luminescent layer 13 can not contain and possesses electron-transporting, and hole transport ability is injected the material of transmission floor height than electronics.

By embodiment 9 and comparative example 1 as can be known: contain that electronics injects material that transport layer contained and the not luminescent layer 13 of hole transport ability material also can obtain effect of the present invention.

By embodiment 1-8 and comparative example 1 as can be known: adopt the material (main body) that contains in the luminescent layer 12 as the hole transport ability material, also can obtain effect of the present invention.

By embodiment 4,7,8 and comparative example 1 as can be known: make not that the thickness of luminescent layer 13 thickens, then original intensity life-span of partly declining prolongs.

＜embodiment 10 〉

Preparation is formed with the clear glass (substrate) 2 of anode 10 (the ITO layer of thickness 170nm) on a face, carry out the substrate washing.The washing of substrate is to carry out alkali cleaning, pure water washing successively, carries out excimer ultraviolet ray washing after the drying.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on anode 10, make three [4-[N-(3-aminomethyl phenyl)-N-phenyl amino] phenyl of 10nm thickness] layer of amine, with this layer as hole injection layer 31.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), the layer of 4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl of the 70nm thickness of making evaporation is a hole transmission layer 51 with this layer on hole injection layer 31.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on hole transmission layer 51, make red light emitting layer material of main part 4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl of the 5nm thickness of evaporation altogether, red dopant [the 2-tert-butyl group-6-[is trans-2-(2,3,5,6-tetrahydrochysene-1,1,7,7-tetramethyl-benzo [i, j] quinolizine-9-yl) vinyl]-4H-pyrans-4-subunit]-1,3-malononitrile (0.5 weight %) and green light dopant N, the layer of N '-dimethylquinacridone (1 weight %) is a red light emitting layer 321 with this layer.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), on red light emitting layer 321, be total to the blue light-emitting layer material of main part 4 that evaporation is made the 25nm thickness, 4 '-two (2,2 '-diphenylacetylene) biphenyl, blue dopant 4, the layer of 4 '-two [2-(N-ethyl carbazole-2-yl) vinyl] biphenyl (3 weight %) is a blue light-emitting layer 320 with this layer.

Measure the hole mobility of red light emitting layer and the hole mobility of above-mentioned blue light-emitting layer, find the hole mobility height of red light emitting layer.

Measure hole mobility, the electron mobility of 4,4 '-two (2,2 '-diphenylacetylene) biphenyl, 4,4 '-two (2,2 '-diphenylacetylene) biphenyl is bipolar materials as a result.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), forming the layer of three (oxine) aluminium of 15nm thickness on blue light-emitting layer 320, is electron transfer layer 54 with this layer.

(carbon crucible, evaporation rate are 0.1nm/s, vacuum degree about 5.0 * 10 by vacuum deposition apparatus ^-5Pa), forming the lithium fluoride layer of 0.5nm thickness on electron transfer layer 54, is electron injecting layer 34 with this layer.

(evaporation rate is 1nm/s, vacuum degree about 5.0 * 10 by the tungsten boat ^-5Pa), forming the aluminium lamination of 100nm thickness on electron injecting layer 34, is negative electrode 15 with this layer, makes organic electroluminescent device.

The organic electroluminescent device of making is emitted encapsulation with glass.Measure this organic electroluminescent device at 1600cd/m ²The chromaticity coordinate of the illuminant colour under the brightness, luminous efficiency (lm/W) and the original intensity when continuing to flow through electric current (are set at 4800cd/m ²) decline the life-span partly that (brightness becomes 2400cd/m ²The time time) and colourity change.Brightness is measured with brightness tester (manufacturing of the ト プ コ of Co., Ltd. Application, trade name BM7).The colourity variation is defined as: the root sum square of 2 powers of 2 powers of the variable quantity of colourity x and the variation of chromaticity y.The variable quantity of colourity is initial colourity and the brightness colour difference when partly decaying.Measurement results etc. are as shown in table 4.

By spectroscopic assay instrument (the ト プ コ of Co., Ltd. Application make, trade name SR-2) when measuring luminescent spectrum, luminescent spectrum is at 440nm or above but 490nm or following, 510nm or above but 550nm or following and 580nm or above but 680nm or following zone have maximal point.

＜embodiment 11-32 〉

In embodiment 11-32, form substrate 2, anode 10, hole transmission layer 51, blue light-emitting layer 320, electron injecting layer 34 and negative electrode 15 similarly to Example 10.

Other layer formed by the material that gathers in following table 4 and 5.Compound number in the table 4 and 5 is as follows.

1: three (oxine) aluminium

2:4,4 '-two (2,2 '-diphenylacetylene) biphenyl

3:4,4 '-two [2-(N-ethyl carbazole-2-yl) vinyl] biphenyl

4:4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl

The 5:[2-tert-butyl group-6-[is trans-2-(2,3,5,6-tetrahydrochysene-1,1,7,7-tetramethyl-benzo [i, j] quinolizine-9-yl) vinyl]-4H-pyrans-4-subunit]-1, the 3-malononitrile

6:N, N '-dimethylquinacridone

7: three [4-[N-(3-aminomethyl phenyl)-N-phenyl amino] phenyl] amine

8:2,9-dimethyl-4,7-diphenyl phenanthroline

9:4,4 '-two [N-(3-aminomethyl phenyl)-N-phenyl amino] biphenyl

10:7-diethylamino benzo [a] phenoxazine-9H-3-ketone

11: cis-2-(1,3-benzothiazole-2-yl)-3-(8-hydroxyl-2,3,5,6-tetrahydrochysene-1,1,7,7-tetramethyl-benzo [i, j] quinolizine-9-yl) acrylic acid lactone

12: three [4-[N-(2-naphthyl)-N-phenyl amino] phenyl] amine

13: dibenzo [c, n] quinacridone

14: porphyrin-copper (II) complex compound

15:[2-methyl-6-[is trans-2-(2,3,5,6-tetrahydrochysene-1,1,7,7-tetramethyl-benzo [i, j] quinolizine-9-yl) vinyl]-4H-pyrans-4-subunit]-1, the 3-malononitrile

16:3-(1,3-benzothiazole-2-yl)-7-diethyl amino coumarin

17: dibenzo [f, g:s, t] pentacene

18:7 '-azepine-8 '-cyclohexyl-9-チ ア ア Application ト ロ [10a, 10-a:9,9a-m:5,10a-1] anthracene-10-ketone

19: dibenzo tetraphenyl ペ リ Off ラ Application テ Application

20: ア Application ト ロ [7,6-o:6,5a-p:5a, 5-q:5,4a-r:4a, 4-s] aphthacene

21: dinaphtho [2,1-d:1,8a-e:8a, 8-f:8,7-g] [4,3-j] anthracene

22: dibenzo [d, e:u, v] pentacene

Only in embodiment 11, electron transfer layer 54 is by 2 of negative electrode one side each lamination 7.5nm successively, 9-dimethyl-4, and 7-diphenyl phenanthroline (8) and three (oxine) aluminium (1) form double-decker.Among the embodiment 12-32, similarly to Example 10, form electron transfer layer 54.

The hole mobility of the red light emitting layer of mensuration embodiment 11-32 and the hole mobility of above-mentioned blue light-emitting layer, the hole mobility height of discovery red light emitting layer.

In embodiment 11,12,14,16,18,20,22,24,26 and 28, evaporation 4,4 ' between red light emitting layer 321 and blue light-emitting layer 320-two [N-(1-naphthyl)-N-phenyl amino] biphenyl (4), the luminous regulating course of formation 1nm thickness.

Shown in following table 4 and 5, red light emitting layer 321 and hole injection layer 31 are formed by various material evaporations.Only in embodiment 12, the material of main part of red light emitting layer 321 uses 4,4 '-[N-(3-aminomethyl phenyl)-N-phenyl amino] biphenyl (9), in embodiment 11 and 13-32, similarly to Example 10, use 4,4 '-two [N-(1-naphthyl)-N-phenyl amino] biphenyl (4) to form.

Luminous for the organic EL of making among the embodiment 11-32 similarly to Example 10, is determined at 1600cd/m ²The chromaticity coordinate of the illuminant colour under the brightness, luminous efficiency (1m/W) and the original intensity when continuing to flow through electric current (are set at 4800cd/m ²) decline the life-span partly that (brightness becomes 2400cd/m ²The time time) and colourity change.Brightness is measured with brightness tester (manufacturing of the ト プ コ of Co., Ltd. Application, trade name BM7).The colourity variation is defined as: the root sum square of 2 powers of 2 powers of the variable quantity of colourity x and the variation of chromaticity y.The variable quantity of colourity is initial chroma and the brightness colour difference when partly decaying.Measurement result is like shown in table 4 and 5.

When measuring luminescent spectrum by the spectroscopic assay instrument, luminescent spectrum is at 440nm or above but 490nm or following, 510nm or above but 550nm or following and 580nm or above but 680nm or following zone have maximal point.

Table 4

			Embodiment 10	Embodiment 11	Embodiment 12	Embodiment 13	Embodiment 14	Embodiment 15	Embodiment 16	Embodiment 17	Embodiment 18	Embodiment 19
													Component structure	Negative electrode		Al	Al	Al	Al	Al	Al	Al	Al	Al	Al
Electron injecting layer		LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF
												Electron transfer layer		1	1 and 8	1	1	1	1	1	1	1	1
Blue light-emitting layer	Main body	2	2	2	2	2	2	2	2	2	2
												Blue dopant	3	3	3	3	3	3	3	3	3	3
	Luminous regulating course		Do not have	4	4	Do not have	4	Do not have	4	Do not have	4												Do not have
Red light emitting layer												Main body	4	4	9	4	4	4	4	4	4	4
	Red dopant	5	5	10	5	15	17	18	10	5	18
												Green dopant	6	6	11	13	16	11	6	16	16	16
	Hole transmission layer		4	4	4	4	4	4	4	4	4												4
Hole injection layer												7	7	12	14	14	14	14	14	12	12
		Anode		ITO	ITO	ITO	ITO	ITO	ITO	ITO	ITO											ITO	ITO
Substrate												Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass
		Evaluation result	Chromaticity coordinates	x	0.32	0.32	0.33	0.32	0.32	0.33	0.31											0.32	0.31	0.3
y	0.31											0.32	0.33	0.31	0.32	0.33	0.31	0.32	0.33	0.32
				Luminous efficiency (Im/W)		12.8	11.1	10.2	12.3	12.1	12.5										11.9	12.3	11.2	10.2
Component life (hr)			345									378	367	432	333	502	307	328	449	346
				Colourity changes		0.007	0.007	0.006	0.007	0.009	0.006										0.01	0.008	0.006	0.008

Table 5

			Embodiment 20	Embodiment 21	Embodiment 22	Embodiment 23	Embodiment 24	Embodiment 25	Embodiment 26	Embodiment 27	Embodiment 28	Embodiment 29	Embodiment 30	Embodiment 31	Embodiment 32
																Component structure	Negative electrode		Al	Al	Al	Al	Al	Al	Al	Al	Al	Al	Al	Al	Al
Electron injecting layer		LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF	LiF
															Electron transfer layer		1	1	1	1	1	1	1	1	1	1	1 and 8	1 and 8	1 and 8
Blue light-emitting layer	Main body	2	2	2	2	2	2	2	2	2	2	2	2	2
															Blue dopant	3	3	3	3	3	3	3	3	3	3	3	3	3
	Luminous regulating course		4	Do not have	4	Do not have	4	Do not have	4	Do not have	4	Do not have	4	Do not have															Do not have
Red light emitting layer															Main body	4	4	4	4	4	4	4	4	4	4	4	4	4
	Red dopant	19	15	5	10	20	21	17	22	19	5	19	10	21
															Green dopant	16	13	6	13	16	11	11	11	13	13	16	13	11
	Hole transmission layer		4	4	4	4	4	4	4	4	4	4	4	4															4
Hole injection layer															12	12	12	14	12	14	12	14	8	8	12	14	14
		Anode		ITO	ITO	ITO	ITO	ITO	ITO	ITO	ITO	ITO	ITO	ITO														ITO	ITO
Substrate															Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass	Glass
		Evaluation result	Chromaticity coordinates	x	0.31	0.32	0.33	0.32	0.31	0.3	0.31	0.32	0.32	0.33														0.33	0.32	0.31
y	0.31														0.32	0.33	0.32	0.31	0.32	0.31	0.32	0.32	0.32	0.31	0.32	0.33
				Luminous efficiency (Im/W)		12.4	11	11.7	10.9	10.2	11.2	9.9	12.4	12.3													11.3	12.8	11.3	11.7
Component life (hr)			478												300	344	341	348	332	344	299	431	332	331	236	256
				Colourity changes		0.006	0.01	0.009	0.009	0.008	0.006	0.01	0.009	0.009													0.01	0.006	0.009	0.006

＜comparative example 2-5 〉

By the material shown in the following table 6, similarly make the organic electroluminescent device of the laminated layer sequence of red light emitting layer and the blue light-emitting layer comparative example different with organic electroluminescent device of the present invention with embodiment.Compound number in compound number in the table 6 and above-mentioned table 4 and the table 5 is common.

With embodiment similarly, measure comparative example organic electroluminescent device illuminant colour chromaticity coordinate, at 1600cd/m ²Luminous efficiency under the brightness (1m/W), the original intensity when continuing to flow through electric current (are set at 4800cd/m ²) decline the life-span partly that (brightness becomes 2400cd/m ²The time time) and colourity change.Brightness is measured with brightness tester (manufacturing of the ト プ コ of Co., Ltd. Application, trade name BM7).The colourity variation is defined as: the root sum square of 2 powers of 2 powers of the variable quantity of colourity x and the variation of chromaticity y.The variable quantity of colourity is initial colourity and the brightness colour difference when partly decaying.Measurement results etc. are as shown in table 6.

Table 6

			Comparative example 2	Comparative example 3	Comparative example 4	Comparative example 5
							Component structure	Negative electrode		Al	Al	Al	Al
Electron injecting layer		LiF	LiF	LiF	LiF
						Electron transfer layer		1 and 8	1 and 8	8	8
Red light emitting layer	Main body	4	1	4	1
						Red dopant	5	5	5	5
	Green dopant	6	6	6	6
						Luminous regulating course		Do not have	Do not have	Do not have	Do not have
Blue light-emitting layer	Main body	2	2	2	2
						Blue dopant	3	3	3	3
	Hole transmission layer		4	4	4						4
Hole injection layer						7	7	7	7
		Anode		ITO	ITO					ITO	ITO
Substrate						Glass	Glass	Glass	Glass
		Evaluation result	Chromaticity coordinates	x	0.33					0.31	0.32	0.32
y	0.55					0.34	0.55	0.34
				Luminous efficiency (Im/W)					4.2	5.3	4.4	5.5
Component life (hr)			182			221	112	144
				Colourity changes					0.007	0.011	0.013	0.013

By table 4-6 as can be known: in the organic electroluminescent device of embodiment, the chromaticity coordinate of illuminant colour has all shown excellent whiteness.And in the organic electroluminescent device of comparative example, especially the y coordinate figure is big in the chromaticity coordinate, and whiteness is unexcellent.

The organic electroluminescent device of embodiment is compared with the organic electroluminescent device of comparative example, and luminous efficiency and component life significantly improve.

Therefore as can be known: in the organic electroluminescent device of embodiment, by set gradually red light emitting layer (containing glow dopant and green light dopant), blue light-emitting layer (containing blue dopant) by its anode one side, excellent whiteness can be obtained, high luminous efficiency and long component life can be obtained simultaneously.

Claims (18)

1. organic electroluminescent device, this organic electroluminescent device is sequentially with luminescent layer at least on anode, electronics injects transport layer and negative electrode, it is characterized in that: be provided with tool electron-transporting and hole transport ability are injected the transmission floor height than above-mentioned electronics not luminescent layer between electronics injection transport layer and the luminescent layer.

2. the organic electroluminescent device of claim 1, it is characterized in that: the electron-transporting of above-mentioned not luminescent layer is than hole transport ability height.

3. claim 1 or 2 organic electroluminescent device is characterized in that: above-mentioned not luminescent layer contains and possesses electron-transporting and hole transport ability are injected the transmission floor height than above-mentioned electronics material.

4. claim 1 or 2 organic electroluminescent device, it is characterized in that: above-mentioned not luminescent layer contains one or more electron transporting material that possess electron-transporting and possesses one or more hole transport ability materials that inject the hole transport ability of transmission floor height than above-mentioned electronics.

5. the organic electroluminescent device of claim 4 is characterized in that: at least a material of above-mentioned electron transporting material is an at least a identical materials of injecting the material that transport layer contains with above-mentioned electronics.

6. claim 4 or 5 organic electroluminescent device is characterized in that: at least a material of above-mentioned hole transport ability material be with above-mentioned luminescent layer at least a identical materials of the material that contains.

7. each organic electroluminescent device among the claim 4-6, it is characterized in that: the electron-transporting of above-mentioned electron transporting material is than the hole transport ability height of above-mentioned hole transport ability material.

8. each organic electroluminescent device among the claim 1-7, it is characterized in that: the hole transport ability of above-mentioned luminescent layer is than electron-transporting height.

9. organic electroluminescent device, this organic electroluminescent device is provided with organic luminous layer and negative electrode successively on anode, it is characterized in that: above-mentioned organic luminous layer sets gradually red light emitting layer and blue light-emitting layer by anode one side, and red light emitting layer contains at least a green light dopant.

10. the organic electroluminescent device of claim 9 is characterized in that: its luminescent spectrum is at 440nm to 490nm, 510nm to 550nm, and have maximal point in the zone of 580nm to 680nm.

11. the organic electroluminescent device of claim 9 or 10 is characterized in that: be provided with luminous regulating course between above-mentioned red light emitting layer and the above-mentioned blue light-emitting layer.

12. each organic electroluminescent device among the claim 9-11 is characterized in that: the thickness of the above-mentioned red light emitting layer of Film Thickness Ratio of above-mentioned blue light-emitting layer is thick.

13. each organic electroluminescent device among the claim 9-12 is characterized in that: above-mentioned red light emitting layer contains at least a dopant that glows.

14. each organic electroluminescent device among the claim 9-13 is characterized in that: the hole mobility of above-mentioned red light emitting layer is than the hole mobility height of above-mentioned blue light-emitting layer.

15. each organic electroluminescent device among the claim 9-14, it is characterized in that: above-mentioned blue light-emitting layer contains at least a pyrene class perylene class that is selected from, anthracene class Benzooxazole kind, the talan yl amine derivatives, benzothiazoles, benzimidazole, the class, luxuriant and rich with fragrance class, the blue dopant of diphenylethyllene benzene class and four aryl butadiene types, with at least a Stilbene class that is selected from, carbazole derivates, diphenylethyllene arylene class, the triaryl amine, two (2-methyl-8-quinolinol) (p-phenyl phenol) aluminium and 4, the bipolarity material of main part of 4 '-two (2,2-diarylethene base) biphenyl class.

16. each organic electroluminescent device among the claim 9-15 is characterized in that: above-mentioned green light dopant is be selected from coumarin derivative and quinacridone derivative at least a.

17. colour display device, this colour display device possess among the claim 1-16 each organic electroluminescent device and absorb at least a filter of a part of the luminescent spectrum of this organic electroluminescent device.

18. the colour display device of claim 17, wherein the light-emitting zone of above-mentioned organic electroluminescent device is at the regional transmission of above-mentioned filter.

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