CN108878688A - Organic electroluminescent LED and preparation method thereof, display device - Google Patents
Organic electroluminescent LED and preparation method thereof, display device Download PDFInfo
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- CN108878688A CN108878688A CN201810724238.7A CN201810724238A CN108878688A CN 108878688 A CN108878688 A CN 108878688A CN 201810724238 A CN201810724238 A CN 201810724238A CN 108878688 A CN108878688 A CN 108878688A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/824—Cathodes combined with auxiliary electrodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
- H10K2102/3023—Direction of light emission
- H10K2102/3026—Top emission
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Abstract
The present invention provides a kind of organic electroluminescent LED and preparation method thereof, display device, belongs to field of display technology.Organic electroluminescent LED of the invention, including：Substrate is sequentially located at the first pole, pixel confining layer, luminescent layer, the second pole, encapsulated layer on the substrate；The encapsulated layer includes at least one set of the first film group；The first film group includes along the first inorganic film, the first organic film set gradually away from second extreme direction；There is fluting in the first film group position corresponding with the barricade of the pixel confining layer；The organic electroluminescent LED further includes auxiliary electrode；The auxiliary electrode is electrically connected by the fluting with second pole.
Description
Technical field
The invention belongs to field of display technology, and in particular to a kind of organic electroluminescent LED and preparation method thereof, aobvious
Showing device.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, referred to as：OLED)
With self luminous characteristic, when a current passes through, OLED will shine.With the rapid advances of display technology,
Semiconductor component technology as display device core has also obtained tremendous progress therewith.For existing display device
Speech, Organic Light Emitting Diode as a kind of current mode luminescent device, because its self-luminous, quick response, wide viewing angle and
The features such as being produced in flexible substrate and be applied in high-performance display field more and more.
Usual OLED includes substrate, the first pole, luminescent layer, the second pole and the encapsulated layer being sequentially located in substrate；And
OLED is divided into top emission type and bottom emitting type according to its light direction again, for its light direction of the OLED of top emission type towards the
Side where two poles, this requires the conductive metals of the second pole light can be made to project well than relatively thin, but along with
Second pole it is lightening, the larger problem of the resistance of the second pole is also brought therewith, so, for large-sized display surface
The problem of for plate, the resistance of the second pole is larger, will certainly bring IR drop causes the reality of display panel inhomogenous.
Therefore, how to improve the second electrode resistance bring display panel and show inhomogenous problem, be that there is an urgent need for solutions
Technical problem.
Summary of the invention
The present invention is directed at least solving one of the technical problems existing in the prior art, provides and a kind of improve display panel
Show the organic electroluminescent LED and preparation method thereof of homogeneity.Display device.
Solving technical solution used by present invention problem is a kind of organic electroluminescent LED, including：Substrate,
It is sequentially located at the first pole, pixel confining layer, luminescent layer, the second pole, encapsulated layer on the substrate；The encapsulated layer includes extremely
Few one group of the first film group；The first film group includes along the first inoranic membrane set gradually away from second extreme direction
Layer, the first organic film；There is fluting in the first film group position corresponding with the barricade of the pixel confining layer；It is described
Organic electroluminescent LED further includes auxiliary electrode；The auxiliary electrode is electrically connected by the fluting with second pole.
Preferably, the described first extremely reflecting electrode, the second extremely transmission electrode.
Preferably, etch stopper conductive layer is additionally provided in the corresponding position of the fluting；Second pole passes through institute
Etch stopper conductive layer is stated to connect with the auxiliary electrode.
It may further be preferable that the material of the etch stopper conductive layer includes metal or organic material.
Preferably, the thickness of first organic film is greater than the thickness of the first inorganic film.
Preferably, at least one set of second film group is being additionally provided with where the auxiliary electrode above layer；Wherein, described
Second film group includes along the second organic film, the second inorganic film set gradually away from the auxiliary electrode direction.
Preferably, the second inorganic film is being additionally provided with where the auxiliary electrode above layer.
The preparation method that technical solution used by present invention problem is a kind of organic electroluminescent LED is solved,
Including：The first pole, pixel confining layer, luminescent layer, the second pole, encapsulated layer are sequentially formed in substrate；Form the encapsulated layer packet
It includes to form at least one set of the first film group；Forming the first film group includes sequentially forming the along away from second extreme direction
One inorganic film, the first organic film；The preparation method of the organic electroluminescent LED further includes：
Fluting is formed in the first film group position corresponding with the barricade of the pixel confining layer；
Form auxiliary electrode；The auxiliary electrode is electrically connected by the fluting with second pole.
Preferably, described to form fluting in the first film group position corresponding with the barricade of the pixel confining layer
The step of, including：
Form the first inorganic film；
The first organic film is formed by way of inkjet printing, and described open is reserved in first organic film
The first part of slot；
The first inorganic film corresponding inorganic material of the first part finally is removed, the fluting is formed.
Preferably, further include between formation second pole and the encapsulated layer：
Etch stopper conductive layer is formed on second pole.
Preferably, after the formation auxiliary electrode, further include：
At least one set of second film group is being formed where the auxiliary electrode above layer；Wherein, second film is formed
Group includes sequentially forming the second organic film, the second inorganic film along away from the auxiliary electrode direction.
Preferably, after the formation auxiliary electrode, further include：
The second inorganic film is being also formed with where the auxiliary electrode above layer.
Solving technical solution used by present invention problem is a kind of display device comprising above-mentioned organic electroluminescence
Light emitting diode.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the organic electroluminescent LED of the embodiment of the present invention 1；
Fig. 2 is a kind of structural schematic diagram of the organic electroluminescent LED of the embodiment of the present invention 1；
Fig. 3 is another structural schematic diagram of the organic electroluminescent LED of the embodiment of the present invention 1；
Fig. 4 is the flow chart of the preparation method of the organic electroluminescent LED of the embodiment of the present invention 2.
Wherein appended drawing reference is：10, substrate；1, anode；2, cathode；3, luminescent layer；4, pixel confining layer；5, the first film
Group；51, the first inorganic film；52, the first organic film；6, auxiliary electrode；7, etch stopper conductive layer；8, the second film group；
81, the second inorganic film；82, the second organic film；9, it slots.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Present invention is further described in detail for formula.
Organic electroluminescent LED namely OLED device, generally include the first pole, the second pole, and setting is the
Luminescent layer between one pole and the second pole；Wherein, one of the first pole and the second pole are cathode, and one is anode；In this reality
It applies in example with the first extremely anode, second is extremely illustrated for cathode.
Wherein, articulamentum of the anode as the organic electroluminescent LED forward voltage, have preferable electric conductivity,
Visible transparent and higher work function value.Anode generally use inorganic, metal oxide (such as：Tin indium oxide ITO, oxygen
Change zinc ZnO etc.) or organic conductive polymer (such as PEDOT：PSS, PANI etc.) or high work content numerical value metal material (such as：Gold,
Copper, silver, platinum etc.) it is made.
Articulamentum of the cathode as the organic electroluminescence device negative voltage has preferable electric conductivity and lower
Work function value.Cathode generallys use the metal material of low work function value, such as：Lithium, magnesium, calcium, strontium, aluminium, indium etc. or above-mentioned low function
The metal material of functional value and the alloy of copper, gold, silver are made.
It should be noted that mainly being carried out by taking the organic electroluminescent LED of top emission type as an example in the present embodiment
Illustrate, that is, cathode is then reflecting electrode, cathode is then transmission electrode, so, also requires the thickness of cathode enough
It is thin, about in 10nm or so.
Below in conjunction with specific embodiment to organic electroluminescent LED, the preparation side of the organic electroluminescent LED
Method, and be illustrated using the display device of the organic electroluminescent LED.
Embodiment 1：
As shown in Figure 1, the present embodiment provides a kind of organic electroluminescent LEDs, including：Substrate 10, is sequentially located at substrate
Anode 1, pixel confining layer 4, luminescent layer 3, cathode 2, encapsulated layer on 10；Encapsulated layer includes at least one set of the first film group 5；
The first film group 5 includes along the first inorganic film 51, the first organic film 52 set gradually away from 2 direction of cathode；First
The position corresponding with 4 barricade of pixel confining layer of film group 5 has fluting 9；Organic electroluminescent LED further includes auxiliary electrode
6；Auxiliary electrode 6 is electrically connected by fluting 9 with cathode 2.
By organic electroluminescent LED in this present embodiment cathode 2 by fluting 9 in the first film group 5 with it is auxiliary
Both cathode 2 and auxiliary electrode 6 in the electrical connection of electrode 6 namely the present embodiment is helped then to be equivalent to cathode 2 in the prior art, and
For cathode 2 and auxiliary electrode 6 in the present embodiment by the way of in parallel, the resistance of the two is significantly less than cathode in the prior art
Therefore 2 resistance when being applied to the organic electroluminescent LED in the present embodiment in display panel, can effectively delay
Solve cathode 2 due to thickness it is thin, resistance is big, caused by IR drop the problem of.Simultaneously as in the present embodiment for being electrically connected
The first inorganic film 51 and the first organic film 52 when connecing the fluting 9 of cathode 2 and auxiliary electrode 6 in the first film group 5
, the first part of fluting 9 can be then formed in the first organic film 52 being located on the first inorganic film 51 at this time
Structure and then the first inorganic film 51 of etching form fluting 9, can effectively stop the pollution of the impurity such as water, oxygen organic at this time
The luminescent layer 3 of electroluminescent diode, and influence the service life of organic electroluminescent LED.
Wherein, etch stopper conductive layer 7 is additionally provided in 9 corresponding positions of slotting；Cathode 2 passes through etch stopper conductive layer
7 connect with the auxiliary electrode 6.That is, why such as etch stopper conductive layer 7 is located on cathode 2, and contacts with cathode 2,
This setting is because the thinner thickness of cathode 2 prevents from damaging cathode when the first inorganic film 51 on etching cathode 2
2.However, it is to be understood that it is non-overlapping when the projection of etch stopper conductive layer 7 and luminescent layer 3 on the substrate 10, to avoid
Etch stopper conductive layer 7 influences shining for organic electroluminescent LED.
Wherein, the material of etch stopper conductive layer 7 can be metal material, specifically can be, aluminium, silver, in magnesium at least
One kind being also possible to remaining conductive preferably metal material.Certainly, etch stopper conductive layer 7 in the present embodiment goes back material
It can be conducting organic material, specifically can be, heavy doping (N+doping) material.
Wherein, in the present embodiment in order to prevent auxiliary electrode 6 be corroded oxidation and influence organic electroluminescent LED
Service life, it is preferred that be additionally provided with the second inorganic film 81 above 6 place layer of auxiliary electrode, as shown in Figure 2.Certainly, it can also be
As shown in figure 3, at least one set of second film group is arranged above auxiliary electrode 6, the second film group includes along away from the auxiliary
The second organic film 82 that 6 direction of electrode is set gradually, the second inorganic film 81.Also that is, the encapsulated layer of auxiliary cathode 2,
Using inorganic film and organic film cooperation to encapsulate, be conducive to water preventing ability and stress.
Wherein, it is inorganic to be greater than first for the thickness of the first organic film 52 in every group of the first film group 5 in the present embodiment
The thickness of film layer 51 prevents the impurity such as water, oxygen from polluting so that the first organic film 52 is completely covered to the first inorganic film 51
Organic electroluminescent LED.
Embodiment 2：
The present embodiment provides a kind of preparation method of organic electroluminescent LED, can be used for preparing in embodiment 1
Organic electroluminescent LED.The preparation method, including：Anode 1, pixel confining layer 4, luminescent layer are sequentially formed on the substrate 10
3, cathode 2, encapsulated layer；Forming the encapsulated layer includes forming at least one set of the first film group 5；Form the first film group 5
Including sequentially forming the first inorganic film 51, the first organic film 52 along away from second extreme direction；Specifically, Organic Electricity
The preparation method of photoluminescence diode further includes：It is formed in the position corresponding with 4 barricade of pixel confining layer of the first film group 5
Fluting 9；Form auxiliary electrode 6；The auxiliary electrode 6 is electrically connected by the fluting 9 with second pole.
The first film group is passed through by the cathode 2 of the formed organic electroluminescent LED of preparation method in this present embodiment
Fluting 9 in 5 be electrically connected with auxiliary electrode 6 namely the present embodiment in both cathode 2 and auxiliary electrode 6 be then equivalent to existing skill
Cathode 2 in art, and cathode 2 in the present embodiment and auxiliary electrode 6, by the way of in parallel, the resistance of the two is significantly less than existing
There is the resistance of the cathode 2 in technology, therefore, the organic electroluminescent LED in the present embodiment is applied in display panel
When, can effectively alleviate cathode 2 since thickness is thin, resistance is big, caused by IR drop the problem of.Simultaneously as in this reality
51 He of the first inorganic film when applying in example for being electrically connected the fluting 9 of cathode 2 and auxiliary electrode 6 in the first film group 5
First organic film 52, it can then be formed open in the first organic film 52 being located on the first inorganic film 51 at this time
The first part's structure and then the first inorganic film 51 of etching of slot 9 form fluting 9, can effectively stop water, oxygen etc. at this time
Impurity pollutes the luminescent layer 3 of organic electroluminescent LED, and influences the service life of organic electroluminescent LED.
Below in conjunction with specific the step of forming organic electroluminescence device, the preparation method in the present embodiment is said
It is bright.Wherein, by taking the first film group 5 and the second film group are one group as an example.As shown in figure 4, the preparation method in the present embodiment
It specifically includes：
Step 1: the figure of the anode 1 including organic electroluminescence device is formed by patterning processes on the substrate 10.
Step 2: pixel confining layer 4 is formed by patterning processes, wherein in picture in the substrate 10 for completing above-mentioned steps
Plain confining layers 4 position corresponding with anode 1 etches to form receiving portion.
Step 3:, by evaporation process, forming organic electroluminescence hair in receiving portion in the substrate 10 for completing above-mentioned steps
The luminescent layer 3 of optical device.
Step 4:, by evaporation process, forming the yin of organic electroluminescence device in the substrate 10 for completing above-mentioned steps
Pole 2.Wherein, cathode 2 covers the barricade of luminescent layer 3 and pixel confining layer 4.
Step 5: forming etch stopper conductive layer 7 on cathode 2 in the substrate 10 for completing above-mentioned steps.Why
Such setting is because the thinner thickness of cathode 2 prevents from damaging yin when the first inorganic film 51 on etching cathode 2
Pole 2.However, it is to be understood that it is non-overlapping when the projection of etch stopper conductive layer 7 and luminescent layer 3 on the substrate 10, to keep away
Exempting from etch stopper conductive layer 7 influences shining for organic electroluminescent LED.
Step 6: by way of inkjet printing, forming the first inorganic film in the substrate 10 for completing above-mentioned steps
51；Later, by way of inkjet printing, the first organic film 52 is formed, and reserve fluting in the first organic film 52
First part.
Step 7: in the substrate 10 for completing above-mentioned steps, by etching technics, removal be located at fluting first part it
Under 51 material of the first inorganic film, formed fluting 9.
Step 8: forming the figure including auxiliary electrode 6 by patterning processes in the substrate 10 for completing above-mentioned steps；
Wherein auxiliary electrode 6 is electrically connected by fluting 9 with etch stopper conductive layer 7.It should be understood that auxiliary electrode 6 and luminescent layer 3
It is non-overlapping when projection on the substrate 10, shining for organic electroluminescent LED is influenced to avoid auxiliary electrode 6.
Step 9: by way of inkjet printing, sequentially forming the second organic film in the substrate 10 for completing above-mentioned steps
The 82, second inorganic film 81 of layer.
Certainly, for step 9, the second inorganic film 81 can also be only formed, to be packaged to auxiliary electrode 6.
Embodiment 3：
Present embodiments provide a kind of display device comprising the organic electroluminescent LED in embodiment 1.Wherein,
The auxiliary electrode 6 of adjacent organic electroluminescence device in display device links together, and each auxiliary electrode 6 constitutes one
Reticular structure.
By the organic electroluminescent LED that display device in this present embodiment includes in embodiment 1, therefore its display is equal
One.
Wherein, display device is OLED display, for example, Electronic Paper, oled panel, mobile phone, tablet computer, television set,
Any products or components having a display function such as display, laptop, Digital Frame, navigator.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (13)
1. a kind of organic electroluminescent LED, including：Substrate is sequentially located at the first pole on the substrate, pixel limits
Layer, luminescent layer, the second pole, encapsulated layer；The encapsulated layer includes at least one set of the first film group；The first film group includes edge
The first inorganic film, the first organic film set gradually away from second extreme direction；It is characterized in that, thin described first
Film group position corresponding with the barricade of the pixel confining layer has fluting；The organic electroluminescent LED further includes auxiliary
Electrode；The auxiliary electrode is electrically connected by the fluting with second pole.
2. organic electroluminescent LED according to claim 1, which is characterized in that the described first extremely reflecting electrode,
Second extremely transmission electrode.
3. organic electroluminescent LED according to claim 1, which is characterized in that slot corresponding position also described
It is provided with etch stopper conductive layer；Second pole is connect by the etch stopper conductive layer with the auxiliary electrode.
4. organic electroluminescent LED according to claim 3, which is characterized in that the material of the etch stopper conductive layer
Material includes metal or organic material.
5. organic electroluminescent LED according to claim 1, which is characterized in that the thickness of first organic film
Greater than the thickness of the first inorganic film.
6. organic electroluminescent LED according to claim 1, which is characterized in where the auxiliary electrode on layer
Side is additionally provided at least one set of second film group；Wherein, the second film group include along away from the auxiliary electrode direction according to
The second organic film, the second inorganic film of secondary setting.
7. organic electroluminescent LED according to claim 1, which is characterized in where the auxiliary electrode on layer
Side is additionally provided with the second inorganic film.
8. a kind of preparation method of organic electroluminescent LED, including：The first pole is sequentially formed in substrate, pixel limits
Layer, luminescent layer, the second pole, encapsulated layer；Forming the encapsulated layer includes forming at least one set of the first film group；Form described first
Film group includes sequentially forming the first inorganic film, the first organic film along away from second extreme direction；It is characterized in that, institute
The preparation method for stating organic electroluminescent LED further includes：
Fluting is formed in the first film group position corresponding with the barricade of the pixel confining layer；
Form auxiliary electrode；The auxiliary electrode is electrically connected by the fluting with second pole.
9. the preparation method of organic electroluminescent LED according to claim 8, which is characterized in that described described first
The step of film group position corresponding with the barricade of the pixel confining layer forms fluting, including：
Form the first inorganic film；
The first organic film is formed by way of inkjet printing, and reserves the fluting in first organic film
First part；
The first inorganic film corresponding inorganic material of the first part finally is removed, the fluting is formed.
10. the preparation method of organic electroluminescent LED according to claim 8, which is characterized in that forming described the
Further include between two poles and the encapsulated layer：
Etch stopper conductive layer is formed on second pole.
11. the preparation method of organic electroluminescent LED according to claim 8, which is characterized in that in the formation
After auxiliary electrode, further include：
At least one set of second film group is being formed where the auxiliary electrode above layer；Wherein, the second film group packet is formed
It includes and sequentially forms the second organic film, the second inorganic film along away from the auxiliary electrode direction.
12. the preparation method of organic electroluminescent LED according to claim 8, which is characterized in that in the formation
After auxiliary electrode, further include：
The second inorganic film is being also formed with where the auxiliary electrode above layer.
13. a kind of display device, which is characterized in that including two pole of organic electroluminescent of any of claims 1-7
Pipe.
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