CN109473563A - A kind of OLED luminescent device - Google Patents
A kind of OLED luminescent device Download PDFInfo
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- CN109473563A CN109473563A CN201710807975.9A CN201710807975A CN109473563A CN 109473563 A CN109473563 A CN 109473563A CN 201710807975 A CN201710807975 A CN 201710807975A CN 109473563 A CN109473563 A CN 109473563A
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- extraction layer
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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
- H10K50/85—Arrangements for extracting light from the devices
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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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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Abstract
The present embodiments relate to field of display technology more particularly to a kind of OLED luminescent devices, for realizing big visual angle colour cast is reduced.The OLED luminescent device provided in the embodiment of the present invention, including first electrode, the organic luminous layer being formed in first electrode, the second electrode being formed on organic luminous layer, the first light-extraction layer being formed in second electrode, since the composition material of the first light-extraction layer is the porous material with periodical mesh skeleton, therefore, the light being emitted from second electrode is dissipated into all directions by the first light-extraction layer, in this way, the color offset phenomenon of the light observed from each observation angle can be reduced.
Description
Technical field
The present embodiments relate to field of display technology more particularly to a kind of OLED luminescent devices.
Background technique
Organic electroluminescence device (Organic Light-emitting Diode, abbreviation OLED) is according to light direction point
Class mainly includes the OLED of bottom emitting, emission structure at top.Wherein, top emitting OLED refers to the OLED that light is projected from top device,
Have many advantages, such as the efficiency of device can be improved, narrow and spectrum and improve excitation purity.The production of top emission OLED device structure is suitable
Sequence are as follows: substrate, high reflection electrode, organic luminous layer, half reflection electrode.But in top emitting OLED include opaque total reflection
Electrode and semitransparent electrode, centre of luminescence emission spectrum can generate resonance and finally launch resonance light, due to the direction of resonance light
Have centrality, at big visual angle, resonant cavity length can also shorten, therefore with the offset at visual angle, glow peak shifts,
Lead to the drift of the difference and coloration of brightness, especially under big visual angle, optical property is bad, observes from all directions
Luminescent spectrum and brightness with observation angle change and vary widely, lead to big visual angle colour cast.
Summary of the invention
The embodiment of the present invention provides a kind of OLED luminescent device, reduces big visual angle colour cast to realize.
The embodiment of the present invention provides a kind of OLED luminescent device, comprising: first electrode；It is formed in the first electrode
Organic luminous layer；The second electrode being formed on the organic luminous layer；The first light extraction being formed in the second electrode
Layer, the composition material of first light-extraction layer are the porous material with periodic mesh skeleton.
Optionally, the porous material with periodic mesh skeleton is metal organic framework compound MOFs.
Optionally, the MOFs is formed with organic ligand by self assembly thin film-forming method by metal ion.
Optionally, the metal ion includes appointing in main group metal ion, transition metal ions and lanthanide metal ion
One metal ion species；The organic ligand is carboxylic acid aromatic ligand, any ligand in Nitrogen-Containing Heterocyclic Ligand.
Optionally, the MOFs is deposited in the second electrode using vapor deposition method.
Optionally, first light-extraction layer with a thickness of 10-1000nm.
Optionally, further include the second light-extraction layer between the second electrode and first light-extraction layer；Institute
The composition material for stating the second light-extraction layer is the organic material of non-porous structure.
Optionally, the composition material of second light-extraction layer is N, and N '-diphenyl-N, N '-(1- naphthalene) -1,1 '-joins
Benzene -4,4 '-diamines or 8-hydroxyquinoline aluminium.
The embodiment of the present invention provides a kind of OLED luminescent device, including first electrode, be formed in it is organic in first electrode
Luminescent layer, the second electrode being formed on organic luminous layer, the first light-extraction layer being formed in second electrode, due to the first light
The composition material of extract layer is the porous material with periodic mesh skeleton, and therefore, the light being emitted from second electrode passes through
The porous material of periodical mesh skeleton is dissipated into all directions, in this way, can inhibit the direction centrality of light, so that from each
The spectrum for the emergent light that angular observation is arrived and brightness reduce with observation angle variation degree, and then can reduce from each view angle
Spend the color offset phenomenon of the light observed.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced.
Fig. 1 is a kind of structural schematic diagram of OLED luminescent device provided in an embodiment of the present invention；
Fig. 2 is a kind of MOFs self assembling process schematic diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of OLED luminescent device provided in an embodiment of the present invention；
Specific embodiment
In order to which the purpose of the present invention, technical solution and beneficial effect is more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention.
Fig. 1 shows a kind of structural schematic diagram of OLED luminescent device provided in an embodiment of the present invention.As shown in Figure 1, should
OLED luminescent device includes: first electrode 101, and the organic luminous layer 102 being formed in first electrode is formed in organic luminous layer
On second electrode 103, the first light-extraction layer 104 being formed in second electrode, the composition material of the first light-extraction layer 104 is
Porous material with periodic mesh skeleton.
The organic light emission that OLED luminescent device in the embodiment of the present invention includes first electrode, is formed in first electrode
Layer, the second electrode being formed on organic luminous layer, the first light-extraction layer being formed in second electrode, due to the first light extraction
The composition material of layer is the porous material with periodic mesh skeleton, and therefore, the light being emitted from second electrode passes through the period
The porous material of property mesh skeleton is dissipated into all directions, in this way, can inhibit the direction centrality of light, so that from all angles
The spectrum of the emergent light observed and brightness can be reduced and be seen from each observation angle with observation angle variation degree very little
The color offset phenomenon of the light measured.
In top emission OLED device, first electrode 101 is anode, and second electrode 103 is cathode.
In the embodiment of the present invention, the porous material with periodic mesh skeleton, for example, can be mesoporous for stannic oxide
Material；For another example, or metal organic framework compound MOFs.Due to the combination that MOFs is metal ion and organic ligand
The periodic multidimensional reticular structure porous material formed, it is close to show high-specific surface area, high porosity and lesser solid
Degree, so that light is scattered to all directions by MOFs, so that the light observed from all angles after second electrode outgoing
Spectrum and brightness are almost the same, and then achieve the effect that reduce big visual angle colour cast.
In the embodiment of the present invention, MOFs is formed with organic ligand by self assembly thin film-forming method by metal ion.Fig. 2 shows
A kind of MOFs self assembling process schematic diagram provided in an embodiment of the present invention.As shown in Fig. 2, metal ion center and bridging has
Machine ligand is connected with each other by self assembly, and one kind of formation has the porous material of periodic network structure.
In the embodiment of the present invention, the preparation method of MOFs includes layering diffusion method, hydro-thermal method, solvent-thermal method, stirring synthesis
Method etc., for example, solvent-thermal method preparation MOFs process is substantially are as follows: after OLED device has made second electrode, pass through solvent heat
Organic ligand and metal salt is added in method in organic solvent, and the growth of MOFs is adjusted by control solution concentration, temperature, PH etc..
Specific reaction condition can be configured according to actual needs, and details are not described herein again.
In the embodiment of the present invention, the metal ion in MOFs includes main group metal ion, transition metal ions and group of the lanthanides gold
Belong to any metal ion in ion.Organic ligand is carboxylic acid aromatic ligand, any ligand in Nitrogen-Containing Heterocyclic Ligand.Its
In, more commonly used metal ion includes Zn2+、Al3+, Cu2+、Fe3+Deng；More commonly used carboxylic acid aromatic ligand includes to benzene first
Acid, trimesic acid etc.；Nitrogen-Containing Heterocyclic Ligand includes imidazoles pyrimidine, pyrimidine etc..The embodiment of the present invention provides several optional
MOFs chemical formula: Zn4O(R-BDC)3、Zn2(R-BDC) (DABCO), Al (OH) (R-BDC) and Zn4O(BTB)4/3(R-BDC) etc..
It is deposited on the second electrode based on Fig. 1, MOFs using vapor deposition method.A kind of optional embodiment is,
Direct precipitation MOFs in second electrode.To avoid the direct MOFs of deposition on the second electrode from damaging second electrode, this hair
Bright embodiment also provides another optional embodiment, shifts MOFs in deposited on supports MOFs, then by transfer method
To second electrode.
In the embodiment of the present invention, if the first light-extraction layer is too thin, pass through the first light-extraction layer from second electrode emergent light, and
Cannot be completely dispersed will lead to all directions improve big visual angle colour cast effect it is poor；If the first light-extraction layer is too thick, from
Light path of the second electrode emergent light Jing Guo the first light-extraction layer is longer, and emergent light is likely to by the first light-extraction layer material itself
Absorption, cause light emission rate to reduce.Optionally, the first light-extraction layer with a thickness of 10-1000nm.Preferably, the first light extraction
Layer with a thickness of 100nm.In this way, emergent light by second electrode can be not only reduced by the first light-extraction layer absorptivity, and
And big visual angle colour cast can be improved.
Based on Fig. 1, the embodiment of the present invention also provides a kind of OLED luminescent device, and Fig. 3 shows offer of the embodiment of the present invention
Another OLED luminescent device structural schematic diagram.As shown in figure 3, the OLED luminescent device includes: first electrode 101, shape
At in the organic luminous layer 102 in first electrode, the second electrode 103 being formed on organic luminous layer is formed in second electrode
On the first light-extraction layer 104, and the second light-extraction layer 105 between second electrode and the first light-extraction layer；Wherein,
The composition material of second light-extraction layer 105 is the organic material of non-porous structure.In a kind of optional embodiment, the second light is mentioned
Taking layer can be the organic material that refractive index is high, absorptivity is low, and optionally, the composition material of the second light-extraction layer is N, N '-two
Phenyl-N, N '-(1- naphthalene) -1,1 '-biphenyl -4,4 '-diamines (NTB) or 8-hydroxyquinoline aluminium (Alq3).
In the embodiment of the present invention, OLED emitting device structure shown in Fig. 3 is compared to OLED luminescent device knot shown in FIG. 1
Structure increases the second light-extraction layer.On the one hand, second electrode is generally half reflection electrode, for example uses Mg-Ag alloy, at it
On increase one layer of second light-extraction layer be non-porous structure organic material, this organic material have high refractive index, low suction
The characteristics of yield, in this way, can to avoid emergent light from second electrode to air in total reflection, that is to say, that increase from
Light emission rate of two electrodes to the second light-extraction layer.Emergent light is emitted in air from the first light-extraction layer, will not generally be occurred complete
Reflection；Even if being totally reflected from the first light-extraction layer to air, these reflected lights also can partially be reflected by second electrode, because
This, the addition of the second extract layer is conducive to improve transmissivity and light guide extracting rate.On the other hand, is formed in the second light-extraction layer
One light-extraction layer can effectively can inhibit the direction centrality of light so that the spectrum of the emergent light observed from all angles and
Brightness can reduce the color offset phenomenon of the light observed from each observation angle with observation angle variation degree very little.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of OLED luminescent device characterized by comprising
First electrode；
The organic luminous layer being formed in the first electrode；
The second electrode being formed on the organic luminous layer；
The first light-extraction layer being formed in the second electrode, the composition material of first light-extraction layer are with periodicity
Mesh skeleton porous material.
2. OLED luminescent device as described in claim 1, which is characterized in that described porous with periodic mesh skeleton
Material is metal organic framework compound MOFs.
3. OLED luminescent device as claimed in claim 2, which is characterized in that the MOFs is led to by metal ion and organic ligand
Self assembly thin film-forming method is crossed to be formed.
4. OLED luminescent device as claimed in claim 3, which is characterized in that the metal ion include main group metal ion,
Any metal ion in transition metal ions and lanthanide metal ion；The organic ligand is carboxylic acid aromatic ligand, nitrogenous
Any ligand in heterocyclic ligand.
5. OLED luminescent device as claimed in claim 2, which is characterized in that the MOFs is deposited on using vapor deposition method
In the second electrode.
6. OLED luminescent device as described in claim 1, which is characterized in that first light-extraction layer with a thickness of 10-
1000nm。
7. OLED luminescent device as described in claim 1, which is characterized in that further include positioned at the second electrode and described the
The second light-extraction layer between one light-extraction layer；
The composition material of second light-extraction layer is the organic material of non-porous structure.
8. OLED luminescent device as claimed in claim 7, which is characterized in that the composition material of second light-extraction layer is N,
N '-diphenyl-N, N '-(1- naphthalene) -1,1 '-biphenyl -4,4 '-diamines or 8-hydroxyquinoline aluminium.
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| CN201710807975.9A CN109473563B (en) | 2017-09-08 | 2017-09-08 | OLED light-emitting device |
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| CN201710807975.9A CN109473563B (en) | 2017-09-08 | 2017-09-08 | OLED light-emitting device |
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| CN112164710A (en) * | 2020-09-25 | 2021-01-01 | 武汉华星光电半导体显示技术有限公司 | OLED array substrate and display panel |
| CN113078271A (en) * | 2020-01-03 | 2021-07-06 | 上海和辉光电有限公司 | Organic electroluminescent device and display device |
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