CN109545997A - A kind of display panel and display device - Google Patents
A kind of display panel and display device Download PDFInfo
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- CN109545997A CN109545997A CN201811512619.5A CN201811512619A CN109545997A CN 109545997 A CN109545997 A CN 109545997A CN 201811512619 A CN201811512619 A CN 201811512619A CN 109545997 A CN109545997 A CN 109545997A
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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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
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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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
- H10K50/171—Electron injection layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
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Abstract
The invention discloses a kind of display panel and display devices.The display panel includes: substrate, and the multiple organic light-emitting units being set on the substrate；The organic light-emitting units include the anode being stacked, hole injection layer, hole transmission layer, organic luminous layer and cathode；The hole injection layer includes at least two straton hole injection layers, each sub- hole injection layer includes hole-injecting material and hole mobile material, along the direction for being directed toward the hole transmission layer by the anode, the volume accounting of hole-injecting material is sequentially reduced in at least two straton hole injection layers.The scheme of the embodiment of the present invention reduces the power consumption of display panel, improves the service life of display panel.
Description
Technical field
The present invention relates to display technology more particularly to a kind of display panel and display devices.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) display panel is a kind of self-luminous
Display panel, OLED display panel is due to using temperature with frivolous, high brightness, low-power consumption, wide viewing angle, high response speed and width
Spend range the advantages that and be applied in various high-performance display fields more and more.
However, the power consumption of existing OLED display panel is reduced for the OLED display panel that higher performance requires, and
The service life for improving OLED display panel becomes the key of research.
Summary of the invention
The present invention provides a kind of denomination of invention, to realize the power consumption for reducing display panel, improves the service life of display panel.
In a first aspect, the embodiment of the invention provides a kind of display panel, which includes:
Substrate, and the multiple organic light-emitting units being set on the substrate；
The organic light-emitting units include the anode being stacked, hole injection layer, hole transmission layer, organic luminous layer and
Cathode；
The hole injection layer includes at least two straton hole injection layers, and each sub- hole injection layer includes hole note
Enter material and hole mobile material, along the direction for being directed toward the hole transmission layer by the anode, at least two straton holes
The volume accounting of hole-injecting material is sequentially reduced in implanted layer.
Optionally, the material and the hole mobile material that the hole transmission layer uses is same materials.
Optionally, the volume accounting of hole-injecting material described in the sub- hole injection layer is greater than or equal to 1%, and small
In or equal to 5%.
Optionally, the hole mobile material includes N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'-
Diamines and/or 4,4', 4 "-three [2- naphthylphenyl amino] triphenylamines, N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- connection
Benzene -4,4'- diamines volume accounting in hole mobile material is 0%-100%；
The hole-injecting material includes 7,7,8,8- four cyano benzoquinone's bismethane.
Optionally, the value range of the overall thickness T1 of the hole injection layer are as follows: 5nm≤T1≤20nm.
Optionally, the organic light-emitting units include the first sub- hole injection layer and the second sub- hole injection layer, and described the
One sub- hole injection layer is set between the described second sub- hole injection layer and the anode；
The volume accounting of hole-injecting material is greater than or equal to 3% in the first sub- hole injection layer, and is less than or waits
In 5%；
The volume accounting of hole-injecting material is greater than or equal to 1% in the second sub- hole injection layer, and less than 3%.
Optionally, the organic light-emitting units further include the electronics being set between the organic luminous layer and the cathode
Transport layer and electron injecting layer, the electron transfer layer are arranged between the electron injecting layer and the organic luminous layer；
The electron injecting layer includes at least two straton electron injecting layers, and each sub- electron injecting layer includes that electronics passes
Defeated material and electron injection material of main part；The direction of the electron transfer layer, at least two stratons electricity are directed toward along the cathode
The volume accounting of electron transport material is sequentially increased in sub- implanted layer.
Optionally, the volume accounting of electron injection material of main part described in the sub- electron injecting layer is greater than or equal to
10%, and it is less than or equal to 70%.
Optionally, the electron injection material of main part includes ytterbium or lithium fluoride；The electron transport material includes 8- hydroxyl
Quinoline lithium.
Optionally, the value range of the overall thickness T2 of the electron injecting layer is 1nm < T2≤2nm.
Second aspect, the embodiment of the invention also provides a kind of display device, which includes that the present invention is any real
Apply display panel described in example.
The embodiment of the present invention is passed by setting at least two straton hole injection layers, and along the hole is directed toward by the anode
The direction of defeated layer, the volume accounting of hole-injecting material is sequentially reduced in at least two straton hole injection layers, so that along sun
The HOMO energy level difference of the direction of pole direction hole transmission layer, sub- hole injection layer and hole transmission layer reduces step by step, can be to sky
Injection barrier of the cave between sub- hole injection layer and hole transmission layer plays buffer function.On the one hand, hole can be slowed down to exist
The oxidation/reduction reaction of interface between hole transmission layer and sub- hole injection layer, the rising for delaying driving to press, delays to show
The rising of panel power consumption improves the service life of display panel；On the other hand, hole injection efficiency can be improved, increase arrival
The hole of organic luminous layer is measured, to improve the compound quantity of hole and electronics, improves the luminous efficiency of organic light-emitting units, thus
Driving voltage needed for reduction reaches predetermined luminance, further reduced the power consumption of display panel, improves the use of display panel
Service life.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of display panel provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of organic light-emitting units provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of another organic light-emitting units provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of another organic light-emitting units provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of another organic light-emitting units provided in an embodiment of the present invention；
Fig. 6 is also a kind of schematic diagram of organic light-emitting units provided in an embodiment of the present invention；
Fig. 7 is a kind of schematic diagram of display device provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
The organic light-emitting units of OLED display panel include cathode, anode and organic luminous layer.When organic light-emitting units
When cathode and anode both ends apply voltage, the carrier in organic light-emitting units injects organic luminous layer from anode and cathode respectively
Recombination luminescence.Since the energy level of different film layers is not quite similar, so that there are injection barriers for the interface of different film layers.With making
With the increase of time, carrier is accumulated in film layer interface, and oxidation/reduction constantly carries out on interface, to will cause interface
The continuous increase of potential barrier, driving voltage rise with it.And the raising of driving voltage necessarily causes the power consumption of display panel to rise, from
And the service life is caused to decline.
To solve the above problems, present embodiments providing a kind of display panel, which includes:
Substrate, and the multiple organic light-emitting units being set on the substrate；
The organic light-emitting units include the anode being stacked, hole injection layer, hole transmission layer, organic luminous layer and
Cathode；
The hole injection layer includes at least two straton hole injection layers, and each sub- hole injection layer includes hole note
Enter material and hole mobile material, along the direction for being directed toward the hole transmission layer by the anode, at least two straton holes
The volume accounting of hole-injecting material is sequentially reduced in implanted layer.
Specifically, by the way that at least two straton hole injection layers are arranged, and the hole transmission layer is directed toward along by the anode
Direction, the volume accounting of hole-injecting material is sequentially reduced in at least two straton hole injection layers, so that referring to along anode
To the direction of hole transmission layer, the HOMO energy level difference of sub- hole injection layer and hole transmission layer reduces step by step, can exist to hole
Injection barrier between sub- hole injection layer and hole transmission layer plays buffer function.On the one hand, hole can be slowed down in hole
The oxidation/reduction reaction of interface between transport layer and sub- hole injection layer, the rising for delaying driving to press, delays display panel
The rising of power consumption improves the service life of display panel；On the other hand, hole injection efficiency can be improved, it is organic to increase arrival
The hole of luminescent layer is measured, to improve the compound quantity of hole and electronics, the luminous efficiency of organic light-emitting units is improved, to reduce
Driving voltage needed for reaching predetermined luminance further reduced the power consumption of display panel, improve the service life of display panel.
In the present invention, the volume accounting of hole-injecting material refers to single " sub- hole injection in sub- hole injection layer
Based on the total volume 100% of layer ", the volume accounting of hole-injecting material in " the sub- hole injection layer ".In the present invention,
Volume accounting can be calculated by following two mode: mode one, when preparing sub- hole injection layer, pass through crystal oscillator and film
The thicknesses of layers to hole-injecting material and hole mobile material on substrate is deposited in thick instrument monitoring, and then obtains hole injection material
Expect shared volume ratio in sub- hole injection layer.Mode two can be tested using scanning electron microscope and constituent content analysis etc.
Means verify the volume accounting of hole-injecting material in sub- hole injection layer.
A kind of display panel is present embodiments provided, Fig. 1 is a kind of signal of display panel provided in an embodiment of the present invention
Figure, with reference to Fig. 1, which includes:
Substrate 10, and the multiple organic light-emitting units 20 being set on substrate 10；
Organic light-emitting units 20 include the anode 21 being stacked, the first sub- hole injection layer 221, the second sub- hole injection
Layer 222 ... the n-th sub- hole injection layer 22n, hole transmission layer 23, organic luminous layer 24 and cathode 25；Wherein, n be greater than etc.
In 2 positive integer；
Each sub- hole injection layer includes hole-injecting material and hole mobile material, is directed toward hole transport along by anode 21
The direction of layer 23, the first sub- hole injection layer 221, the second sub- hole injection layer 222 ... and the n-th sub- hole injection layer 22n
The volume accounting of middle hole-injecting material is sequentially reduced.
Specifically, the first sub- hole injection layer 221, the second sub- hole injection layer 222 ... and the n-th sub- hole injection
Layer 22n use just as material component, i.e., include identical hole mobile material and hole-injecting material, and the first sub- hole
The volume of hole-injecting material accounts in implanted layer 221, the second sub- hole injection layer 222 ... and the n-th sub- hole injection layer 22n
Than being sequentially reduced so that the first sub- hole injection layer 221, the second sub- hole injection layer 222 ... and the n-th sub- hole injection
The HOMO energy level difference of layer 22n and hole transmission layer 23 reduce step by step, and hole in the n-th sub- hole injection layer 22n can be set
The volume of injection material account for it is smaller so that the HOMO energy level difference of the n-th sub- hole injection layer 22n and hole transmission layer 23 are smaller,
Injection barrier of the hole between sub- hole injection layer and hole transmission layer 23 can be reduced, hole injection efficiency is improved.One side
The raising of face hole injection efficiency reduces the accumulation of interface of the hole between hole transmission layer and sub- hole injection layer, from
And the oxidation/reduction reaction of interface is slowed down, the rising for having delayed driving to press has delayed the rising of display panel power consumption, has mentioned
The high service life of display panel；On the other hand, hole injection efficiency is improved, the sky for reaching organic luminous layer can be increased
Cave amount, to improve the compound quantity of hole and electronics, improve the luminous efficiency of organic light-emitting units, thus reduce reach preset it is bright
Driving voltage needed for degree, further reduced the power consumption of display panel, improves the service life of display panel.
In addition, the material that hole mobile material and hole transmission layer 23 use can be same material, due to the n-th sub- hole
The volume of hole-injecting material accounts for smaller in implanted layer 22n, then the material of the n-th sub- hole injection layer 22n and hole transmission layer
It is closer to, can further slow down the oxidation/reduction reaction of interface, to delay the rising of display panel power consumption, improve aobvious
Show the service life of panel.
Optionally, the volume accounting of hole-injecting material is greater than or equal to 1% in sub- hole injection layer, and is less than or equal to
5%.
Specifically, sub- hole injection layer is for injecting hole, the volume accounting of hole-injecting material in sub- hole injection layer
It is too small that hole injection fluence is easy to cause to reduce, so that the hole amount for reaching organic luminous layer 24 is very few, lead to organic light-emitting units
20 luminous efficiencies are low；The volume accounting of hole-injecting material is excessive in sub- hole injection layer, is easy to cause the note of hole and electronics
Enter amount imbalance, influence the stability of organic light-emitting units 20, and makes sub- hole injection layer and hole transmission layer 23
HOMO energy level difference is excessive, is unfavorable for hole injection.It is big by the volume accounting that hole-injecting material in sub- hole injection layer is arranged
In or be equal to 1%, and be less than or equal to 5%, ensure that the hole injection fluence with higher of organic light-emitting units 20, and make
The HOMO energy level difference of sub- hole injection layer and hole transmission layer 23 is smaller, can be further improved hole injection efficiency, reduces aobvious
The power consumption for showing panel improves the service life of display panel.
Optionally, hole mobile material includes N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines
(CAS No.123847-85-8) and/or 4,4', 4 "-three [2- naphthylphenyl amino] (2- naphthylphenyls of triphenylamine 4,4,4 3
Amino) triphenylamine (CAS No.185690-41-9)；Hole-injecting material includes 7,7,8,8- four cyano benzoquinone's diformazan
Alkane (CAS No.1518-16-7).
Specifically, what the present embodiment was merely exemplary shows several hole mobile materials and hole-injecting material, not pair
Restriction of the invention can also use other materials in other embodiments.
Optionally, the value range of the overall thickness T1 of the hole injection layer are as follows: 5nm≤T1≤20nm.
Wherein, the anode 21 of organic light-emitting units 20 and cathode 25 constitute optical microresonator, i.e. microcavity.Anode 21 and yin
Each film layer and the overall thickness of anode 21 and cathode 25 are that the chamber of microcavity is long between pole 25.In microcavity, only wavelength X meetsLight can just be enhanced, remaining light will weaken.
Wherein, k* λ=2Leff, k is microcavity series, nmAnd dmM layers of refractive index and thickness, θ respectively in microcavity0For light emitting angle,
LeffFor effective light path, Φ1(λ) and Φ2(λ) is respectively the reflection phase shift of anode 21 and cathode 25.The hole injection layer it is total
The wavelength regulation for the light that thickness T1 can be issued according to organic light-emitting units 20 makes the microcavity chamber of organic light-emitting units 20 is long to meet
Above-mentioned formula, so that the light for issuing organic light-emitting units 20 meets the color requirements of display panel.Illustratively, it can be set
The overall thickness T1 of sub- hole injection layer is 5nm, 10nm or 15nm etc..
Fig. 2 is a kind of structural schematic diagram of organic light-emitting units provided in an embodiment of the present invention, optionally, with reference to Fig. 2, edge
The direction of hole transmission layer 23 is directed toward by anode 21, the thickness of the sub- hole injection layer of n-layer reduces step by step.Wherein, the first sub- hole
Implanted layer 221 with a thickness of T11, the second sub- hole injection layer 222 with a thickness of T12 ..., the n-th sub- hole injection layer 22n's
With a thickness of T1n, T11 > T12 > ... > T1n.
Specifically, reduced step by step by the way that the thickness of the sub- hole injection layer of n-layer is arranged, so that along organic hair is directed toward by anode 21
On the direction of photosphere 24, hole residence time on each sub- hole injection layer is successively successively decreased, and advantageously reduces hole by sun
Pole 21 is transmitted to the loss on the path of organic luminous layer 24, and then is conducive to improve hole injection efficiency.
In addition, organic light-emitting units 20 may include that red organic light-emitting units, green organic light-emitting units and blue have
Machine luminescence unit, the number of plies of the sub- hole injection layer being arranged in the organic light-emitting units of different luminescent colors can it is identical can also be with
It is different.
Fig. 3 is the schematic diagram of another organic light-emitting units provided in an embodiment of the present invention, optionally, organic with reference to Fig. 3
Luminescence unit 20 includes that the first sub- hole injection layer 221 and the second sub- hole injection layer 222, the first sub- hole injection layer 221 are set
It is placed between the second sub- hole injection layer 222 and anode 21；
The volume accounting of hole-injecting material is greater than or equal to 3% in first sub- hole injection layer 221, and is less than or equal to
5%；
The volume accounting of hole-injecting material is greater than or equal to 1% in second sub- hole injection layer 222, and less than 3%.
Specifically, guarantee that the injection of the hole with higher of organic light-emitting units 20 is total by the first sub- hole injection layer 221
Amount reduces the HOMO energy level difference between hole transmission layer 23 by the second sub- hole injection layer 222, improves hole injection effect
Rate reduces the power consumption of display panel, improves the service life of display panel.
In addition, passing through two straton hole injection layers of setting, it is ensured that organic light-emitting units 20 have lesser thickness, from
And guarantee that display panel has lesser thickness, meets the lightening development trend of display panel.
It should be noted that hole-injecting material in the first sub- hole injection layer 221 and the second sub- hole injection layer 222
Specific volume accounting, which can according to need, to be set, and the present embodiment is simultaneously not specifically limited, and can be illustratively respectively set
For 3% and 1%.
Fig. 4 is the schematic diagram of another organic light-emitting units provided in an embodiment of the present invention, optionally, with reference to Fig. 4, display
Panel includes the sub- hole injection of the first sub- hole injection layer 221, the second sub- hole injection layer 222 and third that sequence is stacked
Layer 223, the first sub- hole injection layer 221 is set between the second sub- hole injection layer 222 and anode 21；
The volume accounting of hole-injecting material is greater than or equal to 3% in first sub- hole injection layer 221, and is less than or equal to
5%；
The volume accounting of hole-injecting material is greater than or equal to 2% in second sub- hole injection layer 222, and less than 3%；
The volume accounting of hole-injecting material is greater than or equal to 1% in the sub- hole injection layer 223 of third, and less than 2%.
Specifically, guarantee that the injection of the hole with higher of organic light-emitting units 20 is total by the first sub- hole injection layer 221
Amount reduces the HOMO energy between hole transmission layer 23 by the second sub- hole injection layer 222 and the sub- hole injection layer 223 of third
It is differential, hole injection efficiency is improved, the power consumption of display panel is reduced, improves the service life of display panel.Pass through three layers of setting
Sub- hole injection layer, HOMO energy level difference and the sub- hole injection layer 223 of third and hole transport between each sub- hole injection layer
Energy level difference between layer 23 is smaller, injection barrier that can preferably between buffer sublayer hole injection layer and hole transmission layer 23,
So that hole transmission layer 23 is injected in more holes, to reach organic luminous layer 24.
It should be noted that the first sub- hole injection layer 221, the second sub- hole injection layer 222 and the sub- hole injection of third
The specific volume accounting of hole-injecting material, which can according to need, in layer 223 is set, and the present embodiment is simultaneously not specifically limited,
It can be illustratively respectively set to 3%, 2% and 1%, or can be set to 5%, 3% and 1%.
Fig. 5 is the schematic diagram of another organic light-emitting units provided in an embodiment of the present invention, optionally, organic with reference to Fig. 5
Luminescence unit 20 further include:
Electron transfer layer 26 and the electron injecting layer being set between organic luminous layer 24 and cathode 25, electron transfer layer 26
It is set to the side of electron injecting layer (271,272 ... 27m) neighbouring organic luminous layer 24；
Electron injecting layer includes at least two straton electron injecting layers (271,272 ... 27m), each sub- electron injecting layer packet
Include electron transport material and electron injection material of main part；The direction of electron transfer layer 26, at least two stratons electricity are directed toward along cathode 25
The volume accounting of electron transport material is sequentially increased in sub- implanted layer (271,272 ... 27m).
Specifically, with reference to Fig. 5, organic light-emitting units 20 include the first sub- electron injecting layer 271, the second sub- electron injecting layer
272 ... and the sub- electron injecting layer 27m of m, wherein m is the positive integer more than or equal to 2, and the first sub- electron injecting layer 271 is arranged
Between the second sub- electron injecting layer 272 and cathode 25, the first sub- electron injecting layer 271, the second sub- electron injecting layer
The volume accounting of electron transport material is sequentially increased in 272 ... and the sub- electron injecting layer 27m of m.
In the present invention, the volume accounting of electron injection material of main part described in each sub- electron injecting layer be greater than or
Equal to 10%, and be less than or equal to 70%, preferably greater than or equal to 30%, and be less than or equal to 70%, more preferably higher than or
Equal to 30%, and it is less than or equal to 50%.
Specifically, by the way that at least two straton electron injecting layers are arranged, and along the side for being directed toward electron transfer layer 26 by cathode 25
To the volume accounting of electron transport material is sequentially increased at least two straton electron injecting layers, so that referring to along cathode 25 to electronics
The lumo energy difference of the direction of transport layer 26, sub- electron injecting layer and electron transfer layer reduces step by step, can be to electronics in sub- electricity
Injection barrier between sub- implanted layer and electron transfer layer 26 plays buffer function, electron injection efficiency is improved, so as to increase
More to organic light-emitting units are further increased to improve the compound quantity of hole and electronics up to the amount of electrons of organic luminous layer 24
Luminous efficiency, further reduced the power consumption of display panel, improve the service life of display panel.
Optionally, electron injection material of main part includes ytterbium or lithium fluoride；Electron transport material includes 8-hydroxyquinoline lithium.
Specifically, the lower metal of work function can be used in cathode 25, to improve the brightness and efficiency of organic light-emitting units 20.
For make cathode 25 fermi level and the first sub- electron injecting layer 271 lumo energy have lesser energy level difference, sub- electronics
The electron injection material of main part of implanted layer can be using the metal material with the material of cathode 25 with same or similar fermi level
Material, such as the electron injection material of main part of sub- electron injecting layer may include metallic ytterbium (Yb).
Further, since inorganic insulating material stability usually with higher, can pass through the cathode in organic light-emitting units
The stabilization of organic light-emitting units 20 is improved as sub- electron injecting layer using inorganic insulation layer between 25 and organic luminous layer 24
Property.The material of inorganic insulation layer as sub- electron injecting layer for example can be LiF, MgO, Al2O3Deng.Therefore, sub- electron injection
The electron injection material of main part of layer is also chosen as including lithium fluoride (LiF).
Correspondingly, electron transport material, which can be selected, uses identical material with electron transfer layer 26, to reduce sub- electronics note
Enter the energy level difference between layer and electron transfer layer 26, illustratively can choose 8-hydroxyquinoline lithium (Liq).
Fig. 6 is also a kind of schematic diagram of organic light-emitting units provided in an embodiment of the present invention, optionally, organic with reference to Fig. 6
Luminescence unit 20 includes two straton electron injecting layers, i.e., the first sub- electron injecting layer 271 and the second sub- electron injecting layer 272, the
One sub- electron injecting layer 271 is set between the second sub- electron injecting layer 272 and cathode 25, the first sub- electron injecting layer 271
Material is chosen as including electron injection material of main part and electron transport material, and electron injection material of main part and electron transport material
Ratio value be 3:2 (the volume accounting of electron transport material be 40%), such as ytterbium: 8-hydroxyquinoline lithium (Yb:Liq)=3:2,
Or lithium fluoride: 8-hydroxyquinoline lithium (LiF:Liq)=3:2.；The material of second sub- electron injecting layer 272 is chosen as including electronics
Material of main part and electron transport material are injected, and the ratio value of electron injection material of main part and electron transport material is 1:1 (electronics
The volume accounting of transmission material is 50%) such as ytterbium: 8-hydroxyquinoline lithium (Yb:Liq)=1:1 or lithium fluoride: 8- hydroxyl quinoline
Quinoline lithium (LiF:Liq)=1:1.
Optionally, with reference to Fig. 5 and Fig. 6, the value range of the overall thickness T2 of electron injecting layer is 1nm < T2≤2nm.I.e.
One sub- electron injecting layer 271, the second sub- electron injecting layer 272 ... and the sum of thickness of the sub- electron injecting layer 27m of m takes
Value range is 1nm < T2≤2nm.Specifically, by setting relatively thin thickness for sub- electron injecting layer, it is possible to reduce sub- electronics
Thickness of the implanted layer on the direction that cathode 25 is directed toward organic luminous layer 24, to reduce electronics in each straton electron injection
Residence time in the lumo energy of layer, advantageously reduces electronics in the loss of sub- electron injecting layer, and then be conducive to more
Electron injection is into organic luminous layer 24.It should be noted that the specific value of the overall thickness T2 of sub- electron injecting layer can root
According to microcavityIt determines.
Optionally, with reference to Fig. 6, group electron injecting layer 14 includes two straton electron injecting layers, i.e., the first sub- electron injection
When layer 271 and the second sub- electron injecting layer 272, the value range of the thickness T21 of the first sub- electron injecting layer 271 is 0.5nm <
The value range of T21≤1nm, the thickness T22 of the second sub- electron injecting layer 272 are 0.5nm < T22≤1nm.So set,
When sub- electron injecting layer includes two straton electron injecting layer, equally electronics can be made to be efficiently transferred to by sub- electron injecting layer
Machine luminescent layer 24.
Optionally, with reference to Fig. 6, the direction of electron transfer layer 26 is directed toward along cathode 25, at least two straton electron injecting layers
Thickness successively successively decreases.
Specifically, successively successively decreased by the way that the thickness of each sub- electron injecting layer is arranged, electronics can be made to be had by the direction of cathode 25
On the direction of machine luminescent layer 24, electronics residence time on each sub- electron injecting layer is successively successively decreased, and is advantageously reduced electronics and is existed
Loss from the path that cathode 25 is transmitted to organic luminous layer 24, and then be conducive to more electron injection to organic luminous layer
In 24, luminous efficiency is improved.
In addition, it is necessary to explanation, the present embodiment for display panel concrete type and be not specifically limited, this implementation
The scheme of example can be applied to arbitrarily be related to the display panel of the transmission process of electrons and holes, and illustrative display panel can be with
For OLED display panel, light emitting diode with quantum dots QLED display panel, micro- light emitting diode microLED display panel or drawing
Stretch OLED display panel etc..
Emulation testing embodiment
Reference examples (non-existing technology)
A kind of display panel, including substrate and the multiple organic light-emitting units being set on substrate, organic light-emitting units
Including anode, hole injection layer, hole transmission layer, the organic luminous layer being stacked, electron transfer layer, electron injecting layer and yin
Pole.
Wherein, anode material RGO, cathode material are metallic silver.Hole injection layer with a thickness of 20nm, material 7,7,
8,8- four cyano benzoquinone's bismethane；Hole transmission layer with a thickness of 80nm, material N, N'- diphenyl-N, N'- (1- naphthalene
Base) -1,1'- biphenyl -4,4'- diamines and 4,4', 4 "-three [2- naphthylphenyl amino] triphenylamines, wherein N, N'- diphenyl -
N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines and 4,4', the volume ratio of 4 "-three [2- naphthylphenyl amino] triphenylamines
For 1:1.The material of electron injecting layer is lithium fluoride, and with a thickness of 1.8nm, the material of electron transfer layer is 8-hydroxyquinoline lithium, thick
Degree is 2nm.
It is tested by setfos optical simulation software, it is 570h that discovery driving pressure, which rises 0.1V required time,.
Embodiment 1: referring to reference examples, difference is: setting two sub- hole injection layers, the first son for hole injection layer
Hole injection layer is set between the second sub- hole injection layer and anode.
First sub- hole injection layer is with a thickness of 12nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 5% in the volume accounting of the first sub- hole injection layer.
Second sub- hole injection layer is with a thickness of 8nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 3% in the volume accounting of the second sub- hole injection layer.
The simulation results, relative to display panel in reference examples, display panel driving voltage rises 0.1V in embodiment 1
Required time about extends 200h, and the service life about improves 40%.
Embodiment 2: referring to reference examples, difference is: two sub- hole injection layers is set by hole injection layer, by electronics
Implanted layer is set as two sub- electron injecting layers.It is directed toward the direction of cathode by anode, is sequentially set with anode, the first sub- hole note
Enter layer, the second sub- hole injection layer, the second sub- electron injecting layer, the first sub- electron injecting layer and cathode.
First sub- hole injection layer is with a thickness of 12nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 5% in the volume accounting of the first sub- hole injection layer.
Second sub- hole injection layer is with a thickness of 8nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 3% in the volume accounting of the second sub- hole injection layer.
First sub- electron injecting layer is with a thickness of 1nm, the lithium fluoride of material of main part containing electron injection and electron transport material 8- hydroxyl
Base quinoline lithium, wherein electron injection material of main part is 40% in the volume accounting of the first sub- electron injecting layer.
Second sub- electron injecting layer is with a thickness of 0.8nm, the lithium fluoride of material of main part containing electron injection and electron transport material 8-
Oxyquinoline lithium, wherein electron injection material of main part is 30% in the volume accounting of the second sub- electron injecting layer.
The simulation results, relative to display panel in reference examples, display panel driving voltage rises 0.1V in embodiment 2
Required time about extends 300h, and the service life about improves 55%.
Embodiment 3: referring to reference examples, difference is: three sub- hole injection layers is set by hole injection layer, by anode
It is directed toward the direction of light-emitting component, it is empty to be sequentially set with anode, the first sub- hole injection layer, the second sub- hole injection layer and third
Cave implanted layer.
First sub- hole injection layer is with a thickness of 8nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 5% in the volume accounting of the first sub- hole injection layer.
Second sub- hole injection layer is with a thickness of 7nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 3% in the volume accounting of the second sub- hole injection layer.
The sub- hole injection layer of third is with a thickness of 5nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 1% in the volume accounting of the sub- hole injection layer of third.
The simulation results, relative to display panel in reference examples, display panel driving voltage rises 0.1V in embodiment 3
Required time about extends 400h, and the service life about improves 50%.
Embodiment 4: referring to reference examples, difference is: three sub- hole injection layers is set by hole injection layer, by electronics
Implanted layer is set as two sub- electron injecting layers.It is directed toward the direction of cathode by anode, is sequentially set with anode, the first sub- hole note
Enter layer, the second sub- hole injection layer, the sub- hole injection layer of third, the second sub- electron injecting layer, the first sub- electron injecting layer and yin
Pole.
First sub- hole injection layer is with a thickness of 8nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 3% in the volume accounting of the first sub- hole injection layer.
Second sub- hole injection layer is with a thickness of 7nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 2% in the volume accounting of the second sub- hole injection layer.
The sub- hole injection layer of third is with a thickness of 5nm, 7,7,8,8- four cyano benzoquinone's bismethane containing hole-injecting material
With hole mobile material N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines, wherein hole-injecting material
It is 1% in the volume accounting of the sub- hole injection layer of third.
First sub- electron injecting layer is with a thickness of 1nm, the lithium fluoride of material of main part containing electron injection and electron transport material 8- hydroxyl
Base quinoline lithium, wherein electron injection material of main part is 40% in the volume accounting of the first sub- electron injecting layer.
Second sub- electron injecting layer is with a thickness of 0.8nm, the lithium fluoride of material of main part containing electron injection and electron transport material 8-
Oxyquinoline lithium, wherein electron injection material of main part is 30% in the volume accounting of the second sub- electron injecting layer.
The simulation results, relative to display panel in reference examples, display panel driving voltage rises 0.1V in embodiment 4
Required time about extends 900h, and the service life of display panel about improves 60%.
The present embodiment additionally provides a kind of display device, and Fig. 7 is a kind of showing for display device provided in an embodiment of the present invention
It is intended to, with reference to Fig. 7, which includes the display panel 200 that any embodiment of that present invention provides.Display device 100 can
Think the electronic display units such as mobile phone, tablet computer.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts, be combined with each other and substitutes without departing from protection scope of the present invention.Therefore, although by above embodiments to this
Invention is described in further detail, but the present invention is not limited to the above embodiments only, is not departing from present inventive concept
In the case of, it can also include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (11)
1. a kind of display panel characterized by comprising
Substrate, and the multiple organic light-emitting units being set on the substrate；
The organic light-emitting units include the anode being stacked, hole injection layer, hole transmission layer, organic luminous layer and yin
Pole；
The hole injection layer includes at least two straton hole injection layers, and each sub- hole injection layer includes hole injection material
Material and hole mobile material, along the direction for being directed toward the hole transmission layer by the anode, at least two straton holes injection
The volume accounting of hole-injecting material is sequentially reduced in layer.
2. display panel according to claim 1, it is characterised in that:
The material and the hole mobile material that the hole transmission layer uses is same materials.
3. display panel according to claim 1, it is characterised in that:
The volume accounting of hole-injecting material described in the sub- hole injection layer is greater than or equal to 1%, and is less than or equal to
5%.
4. display panel according to claim 1, it is characterised in that:
The hole mobile material includes N, N'- diphenyl-N, N'- (1- naphthalene) -1,1'- biphenyl -4,4'- diamines and/or 4,
4', 4 "-three [2- naphthylphenyl amino] triphenylamines；
The hole-injecting material includes 7,7,8,8- four cyano benzoquinone's bismethane.
5. display panel according to claim 1, it is characterised in that:
The value range of the overall thickness T1 of the hole injection layer are as follows: 5nm≤T1≤20nm.
6. display panel according to claim 3, it is characterised in that:
The organic light-emitting units include the first sub- hole injection layer and the second sub- hole injection layer, the first sub- hole injection
Layer is set between the described second sub- hole injection layer and the anode；
The volume accounting of hole-injecting material is greater than or equal to 3% in the first sub- hole injection layer, and is less than or equal to
5%；
The volume accounting of hole-injecting material is greater than or equal to 1% in the second sub- hole injection layer, and less than 3%.
7. display panel according to claim 1-6, it is characterised in that:
The organic light-emitting units further include the electron transfer layer and electricity being set between the organic luminous layer and the cathode
Sub- implanted layer, the electron transfer layer are arranged between the electron injecting layer and the organic luminous layer；
The electron injecting layer includes at least two straton electron injecting layers, and each sub- electron injecting layer includes electron-transport material
Material and electron injection material of main part；The direction of the electron transfer layer, at least two straton electronics note are directed toward along the cathode
The volume accounting for entering electron transport material in layer is sequentially increased.
8. display panel according to claim 7, it is characterised in that:
The volume accounting of electron injection material of main part described in each sub- electron injecting layer is greater than or equal to 10%, and is less than
Or it is equal to 70%.
9. display panel according to claim 7, it is characterised in that:
The electron injection material of main part includes ytterbium or lithium fluoride；The electron transport material includes 8-hydroxyquinoline lithium.
10. display panel according to claim 7, it is characterised in that:
The value range of the overall thickness T2 of the electron injecting layer is 1nm < T2≤2nm.
11. a kind of display device, which is characterized in that including the described in any item display panels of claim 1-10.
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