CN106328833B - A kind of organic illuminating element, production method and display device - Google Patents
A kind of organic illuminating element, production method and display device Download PDFInfo
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- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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Abstract
The invention discloses a kind of organic illuminating element, production method and display device, which includes：The anode and cathode being oppositely arranged；The functional layer being arranged between anode and cathode；Functional layer includes hole injection layer, hole transmission layer, luminescent layer and the electron transfer layer arranged successively in a first direction；First direction is directed toward cathode perpendicular to anode and cathode, and by anode；Luminescent layer includes the first blue light functional layer and the second blue light functional layer；Wherein, it be (x1, y1) to be emitted the CIE coordinates of blue light by the first blue light functional layer, and the CIE coordinates by the second blue light functional layer outgoing blue light are (x2, y2), and x1=x2, y1 ＞ y2.Technical solution of the present invention can be reduced since three caused by the luminance difference between blue light organic emissive element and feux rouges and green luminescence element synthesizes the partially yellow degree of white light colour gamut, or even avoids the problem that the white light of synthesis is partially yellow, ensure that image display effect.
Description
Technical field
The present invention relates to display device technology field, more specifically, be related to a kind of organic illuminating element, production method with
And display device.
Background technology
With the continuous development of scientific technology, more and more the electronic equipment with display function is widely used in
Among daily life and work, huge facility is brought for daily life and work, becomes current
The indispensable important tool of people.
Electronic equipment realizes that the critical piece of display function is display panel.OLED(Organic Light-Emitting
Diode, organic light emission) display panel is a kind of common display panel of current electronic equipment.Existing organic illuminating element is shown
Show in panel, generally by feux rouges organic illuminating element, green light organic illuminating element and blue light organic emissive element three
Synthesize white light.
But in existing organic illuminating element display panel, due to three kinds of different colours organic illuminating element it is steady
It is qualitative to have differences, blue light organic emissive element relative to feux rouges organic illuminating element and green light organic illuminating element service life compared with
Short, continuous with usage time increases, the luminous intensity of blue light organic emissive element relative to green light organic illuminating element with
And the luminous intensity of feux rouges organic illuminating element can die down, the white light of three's synthesis is partially yellow, influences organic illuminating element display surface
The image display effect of plate.
The content of the invention
To solve the above-mentioned problems, an embodiment of the present invention provides a kind of organic illuminating element, production method and display
Device, can reduce or even avoid since blue light organic emissive element when feux rouges and green luminescence synthin white light with occurring
The problem of white light is partially yellow, ensure that image display effect.
To achieve these goals, the present invention provides following technical solution：
A kind of organic illuminating element, including the anode and cathode being oppositely arranged；It is arranged on the anode and described the moon
Functional layer between pole；The functional layer include arrange successively in a first direction hole injection layer, hole transmission layer, shine
Layer and electron transfer layer；The first direction perpendicular to the anode and the cathode, and as the anode be directed toward described in
Cathode；The luminescent layer includes the first blue light functional layer and the second blue light functional layer；Wherein, the first blue light functional layer is passed through
The CIE coordinates for being emitted blue light are (x1, y1), and the CIE coordinates that blue light is emitted by the second blue light functional layer are (x2, y2),
And x1=x2, y1 ＞ y2.
Present invention also offers a kind of production method of organic illuminating element, the production method includes：One substrate is provided；
First electrode layer is formed on the substrate；The first electrode layer is patterned, forms multiple anodes；The anode surface according to
Secondary formation hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and cathode；The luminescent layer includes the first blue light
Functional layer and the second blue light functional layer；Wherein, it is (x1, y1) by the CIE coordinates of the first blue light functional layer outgoing blue light,
The CIE coordinates that blue light is emitted by the second blue light functional layer are (x2, y2), and x1=x2, y1 ＞ y2.
Present invention also offers a kind of display device, including above-mentioned organic illuminating element.
By foregoing description, organic illuminating element, production method and display device provided in an embodiment of the present invention
In due to the second blue light functional layer outgoing blue light CIE coordinates in y2 be less than the first blue light functional layer outgoing blue light CIE coordinates
Middle y1, for the first blue light functional layer compared with the second blue light functional layer outgoing blue light, the outgoing of the first blue light functional layer is azury
Blue light, the second blue light functional layer are emitted navy blue blue light.Can according to electronics in organic illuminating element and hole it is compound in
The moving direction of the heart sets the first blue light functional layer and the second blue light functional layer relative position relation, and sets in initially compound
The heart is located at the first blue light functional layer so that during the organic illuminating element performance degradation, complex centre is moved by the first blue light functional layer
Move to the second blue light functional layer.In this way, when organic illuminating element is with the growth performance degradation of usage time, cause blue light brightness
During reduction, blue light azury is emitted by the first blue light functional layer and is converted to by the navy blue indigo plant of the second blue light functional layer outgoing
Light, can reduce since three caused by the luminance difference between blue light organic emissive element and feux rouges and green luminescence element closes
Into the partially yellow degree of white light colour gamut, or even avoid the problem that the white light of synthesis is partially yellow, ensure that image display effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is brightness and the time plot of feux rouges in existing OLED display panel, green light, blue light and white light；
Fig. 2 is the blue spectrum figure before the test of blue light organic emissive component life in existing OLED display panel；
Fig. 3 is the blue spectrum figure after the test of blue light organic emissive component life in existing OLED display panel；
Fig. 4 is a kind of structure diagram of organic illuminating element provided in an embodiment of the present invention；
Fig. 5 is the structure diagram of another organic illuminating element provided in an embodiment of the present invention；
Fig. 6 is a kind of flow diagram of production method provided in an embodiment of the present invention；
Fig. 7 is a kind of structure diagram of display device provided in an embodiment of the present invention；
Fig. 8 is a kind of structure diagram of OLED display panel provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
As shown in Figure 1, Fig. 1 is feux rouges, green light, blue light and the brightness of white light and time song in existing OLED display panel
Line chart.Transverse axis T is time shaft, and unit is s (second), and longitudinal axis luminance is luminance axis.Blue light organic emissive element and feux rouges with
And during green light organic illuminating element synthesis white light, since blue light organic emissive element is relative to feux rouges and green light organic light emission member
Part stability is poor, causes blue light organic emissive element poor relative to the stability of feux rouges and green light organic illuminating element,
When three coloured light synthesizes white light, blue light B is larger relative to the decay of feux rouges R and green light G, causes white light W partially yellow, it will influences figure
As display quality, such as so that ghost problem occurs for OLED display panel.
Blue light organic emissive element is due to that the aging of electron transfer layer and hole transmission layer causes to be emitted blue light brightness and declines
Subtract problem, as shown in Figures 2 and 3, Fig. 2 is the indigo plant before the test of blue light organic emissive component life in existing OLED display panel
Light spectrogram, Fig. 3 are the blue spectrum figure after the test of blue light organic emissive component life in existing OLED display panel.Fig. 2 with
In Fig. 3, transverse axis is wavelength, and unit nm, the longitudinal axis is the value of the standard color gamut coordinate CIE-y of blue light.International lighting association CIE systems
A method for being used to describe colourity domain is determined：1931 chromatic diagrams of CIE (CIE 1931Chromaticity Diagram).
With in 1931 chromatic diagrams of CIE of two-dimensional color spatial description, CIE coordinates (x, y) are used for the designated color on X-Y scheme, various
The colourity domain scope that display device can show represents that triangle area is bigger with the delta-shaped region that 3 lines of RGB form,
Mean that the colourity domain scope of display device is bigger.
As shown in Figure 2, before life test, it is identical that three different test electric current j, which correspond to three curves of spectrum, that is,
Say that the corresponding curves of spectrum 1 of j=0.5mA/cm^2, the corresponding curves of spectrum 2 of j=20mA/cm^2, j=60mA/cm^2 are corresponding
3 three of the curve of spectrum overlaps.
From the figure 3, it may be seen that after life test, the spectrum of rear blue light organic emissive element is persistently lighted in contrast, is lighted for a long time
There is obvious acromion in blue light organic emissive element afterwards (corresponding region of dashed rectangle in Fig. 3) near the long wave of blue light,
Caused by the complex centre movement that acromion is due to electronics and hole is found by optical analog, continue in blue light organic emissive member
During lighting, the aging of hole transmission layer and electron transfer layer so that move in complex centre.
Inventor, which studies, to be found, in use, complex centre has mobility to blue light organic emissive element, can be with
Cause blue light organic emissive element in use using the characteristic, after blue light brightness decay, the blueness for increasing blue light is deep
Degree, reduces to set avoiding due to three caused by the luminance difference between blue light organic emissive element and feux rouges and green luminescence element
Person synthesizes the problem of white light colour gamut is partially yellow.
Three kinds of organic illuminating elements be not emitted feux rouges R, green light G, blue light B and synthesis white light W colour gamut coordinate (including
CIE-x, CIE-y) with the test data of brightness Luminance as shown in chart 1- tables 3.
Primary data before 1 life test of table
| CIE-x | CIE-y | Luminance(cd/m^2) | |
| R | 0.66 | 0.34 | 241 |
| G | 0.21 | 0.73 | 468 |
| B | 0.13 | 0.06 | 69 |
| W | 0.3 | 0.31 |
2 blue light B luminance-reductions of table and test data during CI E-y constant
| CIE-x | CIE-y | Luminance(cd/m^2) | |
| R | 0.66 | 0.34 | 241 |
| G | 0.21 | 0.73 | 468 |
| B | 0.13 | 0.06 | 63 |
| W | 0.31 | 0.322 |
Test data when 3 blue light B luminance-reductions of table and CIE-y reductions
| CIE-x | CIE-y | Luminance(cd/m^2) | |
| R | 0.66 | 0.34 | 241 |
| G | 0.21 | 0.73 | 468 |
| B | 0.13 | 0.055 | 63 |
| W | 0.301 | 0.309 |
As shown in Table 1, before life test, three kinds of organic illuminating elements are in the initial non-attenuation state of performance.At this time, in vain
The colour gamut coordinate of light W is (0.3,0.31), and the colour gamut of white light is normal.
As shown in Table 2, after life test, although the phenomenon with complex centre movement, existing organic light emission member
Complex centre is all the time in the light emitting functional layer of identical material in part, therefore the feux rouges R, green light G, the blue light B that are emitted each are corresponded to
CIE-x and CIE-y it is constant, since the organic illuminating element performance degradation degree for being emitted blue light B is larger, therefore the brightness of blue light B
Reduce first, be changed into 63 from 69, cause the CIE-x for synthesizing white light W to be changed into 0.31, CIE-y from 0.3 and be changed into 0.322 from 0.31, make
The colour gamut coordinate deviation yellow light colour gamut coordinate of white light W is obtained, i.e. white light W is partially yellow.
As shown in Table 3, outgoing feux rouges R and the colour gamut coordinate of green light G and brightness are not changed, in blue light B luminance-reductions
While reduce the CIE-y of blue light B, the CIE-x that can to synthesize white light W is 0.301, CIE-y 0.309, is got the bid with table 1
The error range of the colour gamut coordinate of quasi- white light is only 0.01, white light better performances, avoids the problem of white light W is partially yellow.
Based on the studies above, an embodiment of the present invention provides a kind of organic illuminating element, which is blue light
Organic illuminating element, including：
The anode and cathode being oppositely arranged；
The functional layer being arranged between anode and cathode；
Functional layer includes hole injection layer, hole transmission layer, luminescent layer and the electronics arranged successively in a first direction
Transport layer；First direction is directed toward cathode perpendicular to anode and cathode, and by anode；
Luminescent layer includes the first blue light functional layer and the second blue light functional layer；
Wherein, it is (x1, y1) by the CIE coordinates of the first blue light functional layer outgoing blue light, passes through the second blue light functional layer
The CIE coordinates of outgoing blue light are (x2, y2), and x1=x2, y1 ＞ y2.
In organic illuminating element provided in an embodiment of the present invention, the first blue light functional layer and the second blue light functional layer are set.
Since y2 is less than in the CIE coordinates of the first blue light functional layer outgoing blue light in the CIE coordinates of the second blue light functional layer outgoing blue light
Y1, for the first blue light functional layer compared with the second blue light functional layer outgoing blue light, the first blue light functional layer is emitted indigo plant azury
Light, the second blue light functional layer are emitted navy blue blue light.Can be according to electronics in organic illuminating element and the complex centre in hole
Moving direction the first blue light functional layer and the second blue light functional layer relative position relation are set, and initial complex centre is set
Positioned at the first blue light functional layer so that during the organic illuminating element performance degradation, complex centre is moved by the first blue light functional layer
To the second blue light functional layer.In this way, when organic illuminating element is with the growth performance degradation of usage time, blue light brightness is caused to drop
When low, blue light azury is emitted by the first blue light functional layer and is converted to by the navy blue blue light of the second blue light functional layer outgoing,
It can reduce since three caused by the luminance difference between blue light organic emissive element and feux rouges and green luminescence element synthesizes
The partially yellow degree of white light colour gamut, or even avoid the problem that the white light of synthesis is partially yellow, it ensure that image display effect.In order to make this hair
The technical solution that bright embodiment provides is clearer, and such scheme is described in detail below in conjunction with the accompanying drawings.
With reference to figure 4, Fig. 4 is a kind of structure diagram of organic illuminating element provided in an embodiment of the present invention, organic hair
Optical element includes：The anode 11 and cathode 12 being oppositely arranged；The functional layer 13 being arranged between anode 11 and cathode 12.
Functional layer 13 includes hole injection layer 131, hole transmission layer 132, the luminescent layer arranged successively on X in a first direction
133 and electron transfer layer 134.First direction X is directed toward cathode 12 perpendicular to anode 11 and cathode 12, and by anode 11.Hair
Photosphere 133 includes the first blue light functional layer a and the second blue light functional layer b.
Wherein, it is (x1, y1) by the CIE coordinates of the first blue light functional layer a outgoing blue lights, passes through the second blue light functional layer
The CIE coordinates of b outgoing blue lights are (x2, y2), and x1=x2, y1 ＞ y2.
Organic illuminating element is with the increase of usage time, when decaying, the movement in the complex centre in electronics and hole
Direction depends on the electrical stability of electron transfer layer and the electrical stability of hole transmission layer.When the electrical stability of electron transfer layer
More than hole transmission layer electrical stability when, the moving direction in complex centre is first direction X, i.e. complex centre is to electric transmission
Layer is close；When the electrical stability of electron transfer layer is less than the electrical stability of hole transmission layer, the moving direction in complex centre is
The opposite direction of first direction X, i.e. complex centre are close to hole transmission layer.The electricity of hole transmission layer and electron transfer layer is stablized
Property depend on the two material for each using.Can be by selecting the material of hole transmission layer and electron transfer layer, to determine
The moving direction in complex centre in organic illuminating element.In the embodiment of the present invention, to hole transmission layer and electron transfer layer
Material does not limit.
In the embodiment of the present invention, organic illuminating element is blue light organic emissive element.In organic illuminating element, electronics and sky
The initial composite center in cave is located at the first blue light functional layer a.That is, initial service stage, organic illuminating element outgoing
Blue light be by the larger blue light azury of brightness of the first blue light functional layer outgoing.
In this hair embodiment, the thickness for setting the first blue light functional layer a is 2 times of thickness of the second blue light functional layer b.It is real
As shown by data is tested, in blue light organic emissive element function attenuation process, when decay is no more than certain amplitude scope, to white light
CIE coordinates influence it is smaller.The thickness for designing the first blue light functional layer a is 2 times of thickness of the second blue light functional layer b, can be with
So that complex centre is moved to the second blue light functional layer b after blue light decay exceedes the amplitude range, effectively white light is avoided to turn to be yellow.
In use, the complex centre in electronics and hole is moved to organic illuminating element by the first blue light functional layer a
Second blue light functional layer b.In this way, the increase of the usage time with organic illuminating element, although it is emitted the brightness drop of blue light
It is low, but the blue light being emitted is converted to be gone out by the second blue light functional layer b by the first blue light functional layer a blue lights azury being emitted
The navy blue blue light penetrated, when can reduce blue light organic emissive element and synthesizing white light with feux rouges and green light organic illuminating element
The partially yellow degree of white light, or even avoid the problem that synthesis white light is partially yellow.
In an embodiment shown in fig. 4, the first blue light functional layer a is close to cathode 12, and the second blue light functional layer b is close to anode
11.At this time, the electrical stability of electron transfer layer 134 is more than the electrical stability of hole transmission layer 132.The moving direction in complex centre
For the opposite direction of first direction X, initial composite center is in the first blue light functional layer a, with the performance degradation of organic illuminating element,
Complex centre is moved to the second blue light functional layer b by the first blue light functional layer a.Although due to the performance degradation of organic illuminating element
Cause the luminance-reduction for being emitted blue light, but since complex centre by the first blue light functional layer a is moved to the second blue light functional layer
B so that outgoing blue light is converted to navy blue blue light by blue light azury.
First blue light functional layer a has the first base material layer and the first dopant material being entrained in the first base material layer.The
Two blue light functional layer b have the second substrate layer and the second dopant material being entrained in the second substrate layer.Wherein, the first doping
Material and the second dopant material launch blue light when being stimulated, and the first dopant material is different from the second dopant material.
In existing organic illuminating element, normally only sat using a kind of dopant material, the i.e. CIE of blue light functional layer outgoing blue light
Mark (x, y) is constant, therefore, increases over time, the luminosity change of organic illuminating element, performance degradation.It is and of the invention
In the organic illuminating element that embodiment provides, using two layers of blue light functional layer so that organic illuminating element is with usage time
After performance degradation occurs in increase, although the problem of outgoing blue light brightness reduces also occurs, not changing, outgoing blue light is horizontal
The ordinate of orthogonal axes in the colour gamut coordinate of outgoing blue light can be changed while axial coordinate so that the blue degree for being emitted blue light increases
Add, to offset due to the reduction of blue light ingredient caused by blue light brightness reduction.
Y1 depends on the first dopant material in the CIE coordinates of the outgoing blue light of first blue light functional layer a.Second blue light function
Y2 depends on the second dopant material in the CIE coordinates of the outgoing blue light of layer b.In the embodiment of the present invention, to the first dopant material with
And second the species of dopant material do not limit.Can be according to by selecting different material selections to have different y1's and y2
First blue light functional layer a and the second blue light functional layer b.
The quantum efficiency of second dopant material is more than the quantum efficiency of the first dopant material.Quantum efficiency refers to each incidence
The number for the electron-hole pair that photon produces.In this way, when complex centre is moved to the second luminous work(by the first light emitting functional layer a
During ergosphere b, due to the increase of quantum efficiency, it can cause the blue light that the second light emitting functional layer b is emitted that there is stronger brightness, with
Reduce the degree weakened due to luminosity caused by light-emitting component performance degradation.
In light-emitting component provided in an embodiment of the present invention, the first base material layer and the second substrate layer are same material, or are
Not same material.Optionally, the thickness range for setting luminescent layer 133 is 20nm-40nm, including endpoint value.Preferably, Ke Yishe
The thickness range for putting luminescent layer 133 is 20nm-30nm, including endpoint value.Doping of first dopant material in the first base material layer
The doping concentration scope of concentration and the second dopant material in the second substrate layer is 3%-8%, including endpoint value.
As shown in figure 4, in the organic illuminating element, further include：Electronics between cathode 12 and electron transfer layer 134
Implanted layer 135, to improve the photoelectric current of device, increases luminosity.
In other embodiments, as shown in figure 5, Fig. 5 is another organic illuminating element provided in an embodiment of the present invention
Structure diagram, in the organic illuminating element, the first blue light functional layer a is close to anode 11, and the second blue light functional layer b is close to cloudy
Pole 12.At this time, the electrical stability of electron transfer layer 134 is less than the electrical stability of hole transmission layer 132, the mobile side in complex centre
To for first direction.Initial composite center is located at the first blue light functional layer a.
Organic illuminating element provided in an embodiment of the present invention can be bottom emitting organic illuminating element, i.e. anode layer 11 is
Prescribed electrode, cathode 12 are reflecting electrode, and after applying operating voltage between anode 11 and cathode 12, light-emitting component luminescent layer 133 is given birth to
Into blue light be emitted by anode 11, i.e., blue light exit direction be first direction X opposite direction.It can also be the organic hair of dual emission
Optical element, anode 11 and cathode 12 are transparency electrode at this time, and the blue light that light-emitting component luminescent layer 133 generates is at the same time by anode
11 and cathode 12 be emitted.
By foregoing description, in organic illuminating element provided in an embodiment of the present invention, due to the second blue light functional layer
Be emitted blue light CIE coordinates in y2 be less than the first blue light functional layer outgoing blue light CIE coordinates in y1, the first blue light functional layer with
Second blue light functional layer outgoing blue light compares, and the first blue light functional layer is emitted blue light azury, and the second blue light functional layer goes out
Penetrate navy blue blue light.First indigo plant can be set according to electronics in organic illuminating element and the moving direction in the complex centre in hole
Light functional layer and the second blue light functional layer relative position relation, and set initial complex centre to be located at the first blue light functional layer,
So that during the organic illuminating element performance degradation, complex centre is moved to the second blue light functional layer by the first blue light functional layer.This
Sample, when organic illuminating element is with the growth performance degradation of usage time, when causing blue light brightness to reduce, by the first blue light function
Layer is emitted blue light azury and is converted to by the navy blue blue light of the second blue light functional layer outgoing, can reduce since blue light is organic
Three caused by luminance difference between light-emitting component and feux rouges and green luminescence element synthesizes the partially yellow degree of white light colour gamut, even
Avoid the problem that the white light of synthesis is partially yellow, ensure that image display effect.
Based on above-mentioned organic illuminating element, another embodiment of the present invention additionally provides a kind of making side of organic illuminating element
Method, the production method are used for the organic illuminating element for making above-described embodiment offer, and the production method is as shown in fig. 6, Fig. 6 is this
A kind of flow diagram for production method that inventive embodiments provide, the production method include：
Step S11：One substrate is provided.
Step S12：First electrode layer is formed on substrate.
Step S13：Patterned first electrodes layer, forms multiple anodes.
Step S14：Anode surface sequentially form hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and
Cathode.
Luminescent layer includes the first blue light functional layer and the second blue light functional layer., can be empty according to selecting such as above-described embodiment
The electrical stability of cave transport layer and electron transfer layer sets the relative position of the first blue light functional layer and the second blue light functional layer.
Wherein, it is (x1, y1) by the CIE coordinates of the first blue light functional layer a outgoing blue lights, passes through the second blue light functional layer
The CIE coordinates of b outgoing blue lights are (x2, y2), and x1=x2, y1 ＞ y2.
In use, the complex centre in electronics and hole is moved to organic illuminating element by the first blue light functional layer a
Second blue light functional layer b.
After cathode is formed, which, which further includes, is packaged organic illuminating element.In above-described embodiment
Description, the movement in complex centre depend on the otherness of the electrical stability of electron transfer layer and the electrical stability of hole transmission layer.
Initial position and the movement in complex centre can be directly determined according to the design parameter of material property and organic illuminating element
Direction；Or the moving direction in complex centre is drawn up by optical mode.Carry out optical analog determine initial composite center and
, can be by making sample organic illuminating element, by the base material for forming luminescent layer during the moving direction in complex centre
Layer carries out the mode of region doping, and each doping thickness 2nm in base material, is gradually moved from hole transmission layer to electron transfer layer
It is dynamic, remaining position without doping, by the efficiency and spectrum that contrast differently doped regions determine the position in complex centre with
And moving direction.
The forming method of luminescent layer includes：It is deposited to form the first blue light work(by being vaporized on hole transport layer surface for the first time
Ergosphere, the evaporation material being deposited for the first time include the first base material material and the first dopant material；By being vaporized on for the second time
One blue light function layer surface is deposited to form the second blue light functional layer, the evaporation material of second evaporation include the second substrate material with
And with the second dopant material.Wherein, the first dopant material and the second dopant material launch blue light when being stimulated, and first mixes
Miscellaneous material is different from the second dopant material so that the CIE coordinates that blue light is emitted by the first blue light functional layer are (x1, y1), are led to
The CIE coordinates for crossing the second blue light functional layer outgoing blue light are (x2, y2), and x1=x2, y1 ＞ y2.
Alternatively, the forming method of luminescent layer includes：It is deposited to form second by being vaporized on hole transport layer surface for the first time
Blue light functional layer, the evaporation material being deposited for the first time include the second substrate material and the second dopant material；Steamed by second
It is plated in the second blue light function layer surface to be deposited to form the first blue light functional layer, the evaporation material of second of evaporation includes the first base material
Material and with the first dopant material.Wherein, the first dopant material and the second dopant material launch blue light when being stimulated,
First dopant material is different from the second dopant material so that by the first blue light functional layer be emitted blue light CIE coordinates for (x1,
Y1), it is (x2, y2) to be emitted the CIE coordinates of blue light by the second blue light functional layer, and x1=x2, y1 ＞ y2.
As described in above-described embodiment, first can be set according to the electrical stability of hole transmission layer and electron transfer layer
The relative position of blue light functional layer and the second blue light functional layer, details are not described herein.
If the production method is used to prepare independent Nan dian Yao, in the production method, substrate is transparent substrate, works as shape
Into after cathode, which further includes：Substrate is divided into by multiple independent organic illuminating elements by cutting technique, with
Form multiple Nan dian Yaos.
If the production method is used to make OLED display panel, substrate is array base palte at this time, and having on substrate includes
The control circuit of multiple thin film transistor (TFT)s, for controlling OLED.OLED display panel includes Nan dian Yao, feux rouges OLED and green
Light OLED.When forming luminescent layer by the production method, the first blue light functional layer and the second blue light functional layer are used to form indigo plant
The luminescent layer of light OLED, the production method also need to be formed the luminescent layer and green light OLED of feux rouges OLED by evaporation process
Luminescent layer, eventually forms cathode.The cathode of all organic illuminating elements can share same conductive layer.It should be noted that should
In production method, when for making OLED display panel, the steaming of the luminescent layer of Nan dian Yao, feux rouges OLED and green light OLED
Plating order does not limit, and can arbitrarily set the luminescent layer that three kinds of color OLED are deposited in evaporation sequential successively.
Production method provided in an embodiment of the present invention, can be used for making the organic illuminating element that above-described embodiment provides,
Manufacture craft is simple, and cost is low.And the organic illuminating element made can reduce due to blue light organic emissive element and feux rouges with
And three caused by the luminance difference between green luminescence element synthesizes the partially yellow degree of white light colour gamut, or even avoid the white light of synthesis inclined
The problem of yellow, ensure that image display effect.
Based on above-described embodiment, another embodiment of the present invention additionally provides a kind of display device, the display device such as Fig. 7 institutes
Show, Fig. 7 is a kind of structure diagram of display device provided in an embodiment of the present invention, which includes display panel 71.
The display panel includes organic illuminating element.The organic illuminating element is the organic illuminating element in the embodiment of the present invention.
The display device can be the electronic equipment that mobile phone, tablet computer, TV etc. have display function.
In the display device, display panel can with liquid crystal display panel, liquid crystal display panel include liquid crystal display die set with
And backlight module, the light supply apparatus in backlight module includes Nan dian Yao, feux rouges OLED and green light OLED, white for synthesizing
Light.Nan dian Yao is the organic illuminating element provided in above-described embodiment.
In the display device, display panel can be OLED display panel, including：Array base palte and cover board.Array base
Plate includes the machine light-emitting component in the embodiment of the present invention.As shown in figure 8, Fig. 8 shows for a kind of OLED provided in an embodiment of the present invention
Show the structure diagram of panel.The OLED display panel includes array base palte 82 and cover board 81.Cover board 81 can be glass base
Plate, flexible encapsulating substrate or contact panel.
Array base palte 82 includes：Multiple organic illuminating elements.Specifically, array base palte 82 includes：Multiple outgoing blue light B's
The light-emitting component of organic illuminating element, the organic illuminating element of multiple outgoing green light G and multiple outgoing feux rouges R.The OLED faces
All organic illuminating elements can be with array arrangement in plate..Wherein, the organic illuminating element for being emitted blue light B is in above-described embodiment
The organic illuminating element of offer.
Array base palte 82 has substrate 821, and 821 surface of substrate is provided with for controlling organic illuminating element luminance
Control circuit.Organic illuminating element includes anode 822, the first functional layer 824, luminescent layer 825, the second functional layer 826 and the moon
Pole 827.Wherein, the first functional layer 824 includes hole injection layer and hole transmission layer；Second functional layer 826 is passed including electronics
Defeated layer, or the second functional layer 826 include electron transfer layer and electron injecting layer.
The organic illuminating element of outgoing blue light B is the organic illuminating element provided in above-described embodiment, and luminescent layer includes the
One blue light functional layer a and the second blue light functional layer b.
The organic illuminating element luminescent layer for being emitted feux rouges R, green light G and blue light B is separate.All organic illuminating elements
An entire cathode 827 can be shared.
Since electric current is mainly longitudinal current in organic illuminating element, therefore the first functional layer of all organic illuminating elements
824 and second functional layer 826 can share, but in order to avoid horizontal leakage current, two adjacent organic hairs can be set
First functional layer 824 of optical element and the/the second functional layer 826 mutually disconnect, such as the organic light emission of outgoing feux rouges R and green light G
The first functional layer 824 between element can disconnect, and the present invention is not specifically limited this.
In display device provided in an embodiment of the present invention, using the organic illuminating element in above-described embodiment, it can reduce
Since three caused by the luminance difference between blue light organic emissive element and feux rouges and green luminescence element synthesizes white light colour gamut
Partially yellow degree, or even avoid the problem that the white light of synthesis is partially yellow, it ensure that image display effect.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For making disclosed in embodiment
For method and display device embodiment, due to its with embodiment disclosed in organic illuminating element it is corresponding, so description
Fairly simple, reference may be made to the description of the method.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (14)
- A kind of 1. organic illuminating element, it is characterised in that including：The anode and cathode being oppositely arranged；The functional layer being arranged between the anode and the cathode；The functional layer includes hole injection layer, hole transmission layer, luminescent layer and the electronics arranged successively in a first direction Transport layer；The first direction is directed toward the cathode perpendicular to the anode and the cathode, and by the anode；The luminescent layer includes the first blue light functional layer and the second blue light functional layer；Wherein, it is (x1, y1) by the CIE coordinates of the first blue light functional layer outgoing blue light, passes through the second blue light work( The CIE coordinates of ergosphere outgoing blue light are (x2, y2), and x1=x2, y1 ＞ y2；The electronics complex centre initial with hole is located at The first blue light functional layer；In use, the complex centre in electronics and hole is by described for the organic illuminating element One blue light functional layer is moved to the second blue light functional layer.
- 2. organic illuminating element according to claim 1, it is characterised in that the first blue light functional layer is close to the sun Pole, the second blue light functional layer is close to the cathode.
- 3. organic illuminating element according to claim 1, it is characterised in that the first blue light functional layer is close to described the moon Pole, the second blue light functional layer is close to the anode.
- 4. organic illuminating element according to claim 1, it is characterised in that the first blue light functional layer has the first base Material layer and the first dopant material being entrained in the first base material layer；The second blue light functional layer has the second substrate layer and the second dopant material being entrained in second substrate layer；Wherein, first dopant material and second dopant material launch blue light when being stimulated, and described first mixes Miscellaneous material is different from second dopant material.
- 5. organic illuminating element according to claim 4, it is characterised in that the quantum efficiency of second dopant material is big In the quantum efficiency of first dopant material.
- 6. organic illuminating element according to claim 4, it is characterised in that the first base material layer and second base material Layer is same material, or is not same material.
- 7. organic illuminating element according to claim 1, it is characterised in that the thickness range of the luminescent layer is 20nm- 40nm。
- 8. organic illuminating element according to claim 1, it is characterised in that further include：Positioned at the cathode and the electricity Electron injecting layer between sub- transport layer.
- A kind of 9. production method of organic illuminating element, it is characterised in that including：One substrate is provided；First electrode layer is formed on the substrate；The first electrode layer is patterned, forms multiple anodes；Hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and cathode are sequentially formed in the anode surface；Institute Stating luminescent layer includes the first blue light functional layer and the second blue light functional layer；Wherein, it is (x1, y1) by the CIE coordinates of the first blue light functional layer outgoing blue light, passes through the second blue light work( The CIE coordinates of ergosphere outgoing blue light are (x2, y2), and x1=x2, y1 ＞ y2；The electronics complex centre initial with hole is located at The first blue light functional layer；In use, the complex centre in electronics and hole is by described for the organic illuminating element One blue light functional layer is moved to the second blue light functional layer.
- 10. production method according to claim 9, it is characterised in that the forming method of the luminescent layer includes：It is deposited to form the first blue light functional layer by being vaporized on the hole transport layer surface for the first time, the first time steams The evaporation material of plating includes the first base material material and the first dopant material；It is deposited to form the second blue light functional layer by being vaporized on the first blue light function layer surface for the second time, second of steaming The evaporation material of plating includes the second substrate material and with the second dopant material；Wherein, first dopant material and second dopant material launch blue light when being stimulated, and described first mixes Miscellaneous material is different from second dopant material so that by the first blue light functional layer be emitted blue light CIE coordinates be (x1, y1), the CIE coordinates that blue light is emitted by the second blue light functional layer are (x2, y2), and x1=x2, y1 ＞ y2.
- 11. production method according to claim 9, it is characterised in that the forming method of the luminescent layer includes：It is deposited to form the second blue light functional layer by being vaporized on the hole transport layer surface for the first time, the first time steams The evaporation material of plating includes the second substrate material and the second dopant material；It is deposited to form the first blue light functional layer by being vaporized on the second blue light function layer surface for the second time, second of steaming The evaporation material of plating includes the first base material material and with the first dopant material；Wherein, first dopant material and second dopant material launch blue light when being stimulated, and described first mixes Miscellaneous material is different from second dopant material so that by the first blue light functional layer be emitted blue light CIE coordinates be (x1, y1), the CIE coordinates that blue light is emitted by the second blue light functional layer are (x2, y2), and x1=x2, y1 ＞ y2.
- 12. a kind of display device, it is characterised in that including such as claim 1-8 any one of them organic illuminating element.
- 13. display device according to claim 12, it is characterised in that the display device includes array base palte and lid Plate；The array base palte includes the organic illuminating element.
- 14. display device according to claim 12, it is characterised in that the display device includes the liquid crystal being oppositely arranged Display module and backlight module；The backlight module includes light supply apparatus, and the light supply apparatus includes the organic illuminating element.
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| CN103943783A (en) * | 2013-12-31 | 2014-07-23 | 厦门天马微电子有限公司 | Organic light emitting device and display device |
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