CN106206980A - A kind of OLED its preparation method improving light extraction efficiency - Google Patents
A kind of OLED its preparation method improving light extraction efficiency Download PDFInfo
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- CN106206980A CN106206980A CN201610559550.6A CN201610559550A CN106206980A CN 106206980 A CN106206980 A CN 106206980A CN 201610559550 A CN201610559550 A CN 201610559550A CN 106206980 A CN106206980 A CN 106206980A
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- titanium dioxide
- medicinal liquid
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- oled
- scattering 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
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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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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- Electroluminescent Light Sources (AREA)
Abstract
The present invention relates to electric light source technology field, particularly relate to a kind of OLED its preparation method improving light extraction efficiency.Comprising the following steps: step one, prepare titanium dioxide medicinal liquid, described medicinal liquid includes titanium dioxide and the carrier of the described titanium dioxide that suspends；Step 2, described titanium dioxide medicinal liquid is coated on substrate；Step 3, remove in the titanium dioxide medicinal liquid that is applied on substrate can the scattering layer that is attached on described substrate with formation of evaporated components.
Description
Technical field
The present invention relates to electric light source technology field, particularly relate to a kind of its preparation side of OLED improving light extraction efficiency
Method.
Background technology
At present, in illumination and display field, Organic Light Emitting Diode (OrganicLight-EmittingDiode,
OLED) because of its low start voltage, frivolous, the feature of self-luminous etc. self, and it is widely used in illuminating product and display surface
In plate, to meet low energy consumption, the demand such as frivolous and area source.In display floater industry, OLED display is compared to tradition
Film transistor type liquid crystal indicator (TFT-LCD, ThinFilmTransistor-LiquidCrystalDisplay),
There is the most excellent display performance, particularly self-luminous, simple in construction, ultra-thin, fast response time, wide viewing angle, low-power consumption
And the characteristics such as Flexible Displays can be realized, therefore it is described as " illusion display ", adds its investment of production equipment and show much smaller than LCD
Showing device, obtains the favor of Liao Ge great display producer, it has also become the main force of third generation display in Display Technique field.Mesh
Front OLED has been in the eve of scale of mass production, and along with going deep into further of research, continuing to bring out of new technique, OLED must
To there is a breakthrough development.
But, at present, the luminous efficiency of general OLED is relatively low, and the light of wherein most is all-trans due to above-mentioned interface
Penetrate what loss caused, it is therefore desirable to a kind of OLED improving light extraction efficiency.
Summary of the invention
Inventor studies discovery, can improve the light of OLED by arranging one layer of scattering layer between substrate and anode
Extraction efficiency, and because the thickness of this scattering layer is different with the particle diameter of granule in scattering layer, so that light extraction efficiency is had by it
Institute is different.
Specifically, the invention provides a kind of method preparing OLED, comprise the following steps: step one, preparation
Titanium dioxide medicinal liquid, described medicinal liquid includes titanium dioxide and the carrier of the described titanium dioxide that suspends；Step 2, by described titanium dioxide
Titanium medicinal liquid is coated on substrate；Step 3, remove in the titanium dioxide medicinal liquid that is applied on substrate can evaporated components with shape
Become the scattering layer being attached on described substrate.Wherein said can evaporated components mainly include suspending the load of described titanium dioxide
Body.In general, described can evaporated components be in titanium dioxide medicinal liquid can be at high temperature (such as, at 300-600 DEG C)
The material being removed.
In a specific embodiment, during described carrier is selected from water, isopropanol, n-butyl alcohol, acetone, ethanol and methanol extremely
Few one.
In a specific embodiment, titanium dioxide weight/mass percentage composition in described titanium dioxide medicinal liquid is 1-
40%；It is preferably 5-30%, more preferably 15-30%.
In a specific embodiment, the particle diameter of described titanium dioxide is 0.5-15 μm；The grain of the most described titanium dioxide
Footpath is 5-12 μm.
In a specific embodiment, possibly together with dispersant in described titanium dioxide medicinal liquid, described dispersant is selected from second
Acyl acetone；The most described acetylacetone,2,4-pentanedione volume content in described titanium dioxide medicinal liquid is 1-10%, preferably 2-8%.Its
In, time in described titanium dioxide medicinal liquid possibly together with dispersant, described can evaporated components except including the described titanium dioxide that suspends
Outside carrier, also include dispersant (such as, acetylacetone,2,4-pentanedione).
In the present invention, titanium dioxide can be realized by high annealing and be changed into anatase crystal from impalpable structure
The purpose of structure, thus the surface area of titanium dioxide is provided, increase scattering effect.Therefore, in a specific embodiment, with
The temperature of 300-600 DEG C remove in the titanium dioxide medicinal liquid being applied on substrate can evaporated components, preferably at air or nitrogen
The environment of gas is carried out；More preferably remove in the titanium dioxide medicinal liquid that is applied on substrate can process needed for evaporated components
Time is 20-60min.
In a specific embodiment, described titanium dioxide medicinal liquid can also contain CNT, Graphene, acetylene
One or more in the material with carbon element that alkene or C60 etc. have been commercialized.
In a specific embodiment, the mode of titanium dioxide medicinal liquid described in titanium dioxide is in spraying, spin coating and blade coating
One.
In a specific embodiment, step 4 is also included: on described scattering layer, form anode；Step 5: described
Organic electroluminescence structure is formed on anode；And step 6: on described organic electroluminescence structure, form negative electrode.
Present invention also offers a kind of OLED prepared according to said method, described OLED includes substrate and dissipates
Penetrate layer；The most also include the anode being formed at described scattering layer, be formed at the organic electroluminescence structure on described anode, with
And it is formed at the negative electrode on described organic electroluminescence structure.Further, it is also possible between organic electroluminescence structure and negative electrode
Form electron transfer layer.
In a specific embodiment, the thickness of described scattering layer is 5-30 μm；It is preferably 5-20 μm, most preferably 10-15 μ
m。
In a specific embodiment, the particle diameter of the titanium dioxide in described scattering layer is 0.5-15 μm；Preferably 6-12 μm.
Accompanying drawing explanation
Fig. 1 is that the light in the OLED that the embodiment of the present invention 1 prepares propagates light path schematic diagram；
Fig. 2 is the light path schematic diagram that the light in light emitting-type OLED of existing a kind of end is propagated.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described below.
The particle diameter of the titanium dioxide granule in following example is determined by factory data when buying, the scattering prepared
The thickness of layer is by atomic force microscope or sem analysis out.Light extraction efficiency is combined by luminance meter and keithley2400 and carries out
Measure.
Embodiment 1
Preparation is containing the titanium dioxide water slurry that mass content is 25%；Above-mentioned water slurry is spun on glass substrate
On；Then the carrier that the 30min (time) that anneals at 300 DEG C removes in applied suspension is attached to described substrate to be formed
Scattering layer on (being glass in this embodiment).Sequentially form anode, organic layer the most on the scattering layer (also known as organic
EL structure), electron transfer layer and negative electrode, obtain OLRD device, see Fig. 1.
Embodiment 2
Preparation is containing the titanium dioxide water slurry that mass content is 15%；Above-mentioned water slurry is scratched in glass substrate
On；Then the carrier that the 25min (time) that anneals at 600 DEG C removes in applied suspension is attached to described substrate to be formed
On scattering layer.Sequentially form anode, organic layer and negative electrode the most on the scattering layer, obtain OLRD device.
Embodiment 3
Preparation is containing the titanium dioxide isopropanol suspension that mass content is 10%；Above-mentioned water slurry is spun on glass
On substrate；Then the carrier that the 45min (time) that anneals at 400 DEG C removes in applied suspension is attached to described with formation
Scattering layer on substrate.Sequentially form anode, organic layer and negative electrode the most on the scattering layer, obtain OLRD device.
Embodiment 4
Preparation is containing the titanium dioxide isopropanol suspension that mass content is 30%；Above-mentioned water slurry is sprayed at glass
On substrate；Then the carrier that the 50min (time) that anneals at 500 DEG C removes in applied suspension is attached to described with formation
Scattering layer on substrate.Sequentially form anode, organic layer and negative electrode the most on the scattering layer, obtain OLRD device.
Embodiment 5
Preparation is containing the titanium dioxide n-butyl alcohol suspension that mass content is 40%；Above-mentioned water slurry is sprayed at glass
On substrate；Then the carrier that evaporation 30min (time) removes in applied suspension at 100 DEG C is attached to described with formation
Scattering layer on substrate.Sequentially form anode, organic layer and negative electrode the most on the scattering layer, obtain OLRD device.
Embodiment 6
Preparation is containing the titanium dioxide n-butyl alcohol suspension that mass content is 5%, and adds volumn concentration wherein
It it is the acetylacetone,2,4-pentanedione of 2%；Above-mentioned water slurry is sprayed on glass substrate；Then the 30min (time) that anneals at 400 DEG C removes
Remove the scattering layer that the carrier in applied suspension is attached on described substrate with formation.The most successively
Form anode, organic layer and negative electrode, obtain OLRD device.
Embodiment 7
Preparation is containing the titanium dioxide n-butyl alcohol suspension that mass content is 1%, and adds volumn concentration wherein
It it is the acetylacetone,2,4-pentanedione of 1%；Above-mentioned water slurry is sprayed on glass substrate；Then the 20min (time) that anneals at 400 DEG C removes
Remove the scattering layer that the carrier in applied suspension is attached on described substrate with formation.The most successively
Form anode, organic layer and negative electrode, obtain OLRD device.
Comparative example 1
Step 1, weigh tetra-n-butyl titanate 5g and polyvinylpyrrolidone 0.5g, be dissolved in the ethanol of 25ml and being configured to
Solution, obtains spinning solution.
Step 2, offer stainless (steel) wire, as substrate, use spinning solution to carry out electrostatic spinning on stainless (steel) wire, obtain
The electrospinning film of the titaniferous on stainless (steel) wire；Wherein, the voltage in electrostatic spinning is 25-50kV, receiving range i.e. spinning syringe needle with
Distance between stainless (steel) wire 1 is 10-30cm, and the thickness of obtained titanium dioxide film is not more than 10 μm.
Step 3, dried, the electrospinning film of titaniferous is torn from stainless (steel) wire；Concrete, after drying, can optionally soak
The electrospinning film of profit titaniferous, is beneficial to tear it from stainless (steel) wire.
Step 4, offer substrate, be pasted on the electrospinning film of titaniferous on glass substrate, toast at 500 DEG C, must put in place
Scattering layer on substrate.
Step 5, sequentially form anode, organic layer and negative electrode on the scattering layer, obtain OLED.
Comparative example 2
Substrate (for glass in this comparative example) sequentially forms anode, organic layer, electron transfer layer and negative electrode, obtains
OLRD device.See Fig. 2.
Table 1
| Embodiment | The thickness of scattering layer | Grain diameter in scattering layer | Light extraction efficiency |
| Embodiment 1 | 15 microns | 8 microns | 28% |
| Embodiment 2 | 10 microns | 8 microns | 18% |
| Embodiment 3 | 5 microns | 6-7 micron | 15% |
| Embodiment 4 | 8 microns | 8 microns | 10% |
| Embodiment 5 | 10 microns | 12 microns | 11% |
| Embodiment 6 | 12 microns | 10 microns | 11% |
| Embodiment 7 | 12 microns | 10 microns | 9% |
| Comparative example 1 | 12 microns | 7 microns | 8% |
| Comparative example 2 | - | - | 3% |
As it can be seen from table 1 the scattering layer ratio of the present invention does not uses scattering layer to have light extraction efficiency in various degree
Improve, even if compared with the comparative example 1 containing scattering layer, there has also been raising in various degree.The particularly light of embodiment 1-3 carries
The increase degree taking efficiency improves 1-4 times than the increase degree of the light extraction efficiency of comparative example 1.Visible, by the present invention's
The light extraction efficiency of the OLED that method prepares has had significant raising compared to prior art.
Although the present invention is described with reference to its detailed description of the invention, but those skilled in the art should manage
Solution in the case of the real spirit and scope without departing from the present invention, the various changes that can carry out.Furthermore, it is possible to this
The main body of invention, spirit and scope are variously changed to adapt to specific situation, material, material compositions or method step.
All these change is included in the range of the claim of the present invention.
Claims (10)
1. the method preparing OLED, it is characterised in that comprise the following steps:
Step one, preparing titanium dioxide medicinal liquid, described medicinal liquid includes titanium dioxide and the carrier of the described titanium dioxide that suspends；
Step 2, described titanium dioxide medicinal liquid is coated on substrate；
Step 3, remove the titanium dioxide medicinal liquid that is applied on substrate evaporated components can be attached to described substrate to be formed
On scattering layer.
Method the most according to claim 1, it is characterised in that described carrier is selected from water, isopropanol, n-butyl alcohol, acetone, second
At least one in alcohol and methanol.
Method the most according to claim 1 and 2, it is characterised in that titanium dioxide matter in described titanium dioxide medicinal liquid
Amount percentage composition is 1-40%；It is preferably 5-30%, more preferably 15-30%；
The particle diameter of the most described titanium dioxide is 0.5-15 μm；The particle diameter of the most described titanium dioxide is 5-12 μm.
4. according to the method described in any one in claim 1-3, it is characterised in that also contain in described titanium dioxide medicinal liquid
Having dispersant, described dispersant is selected from acetylacetone,2,4-pentanedione；The most described acetylacetone,2,4-pentanedione volume in described titanium dioxide medicinal liquid contains
Amount is 1-10%, preferably 2-8%.
5. according to the method described in any one in claim 1-4, it is characterised in that remove quilt with the temperature of 300-600 DEG C
Coat in the titanium dioxide medicinal liquid on substrate can evaporated components；Preferably carry out in the environment of air or nitrogen；More preferably
Removing in the titanium dioxide medicinal liquid that is applied on substrate to be 20-60min the process time needed for evaporated components.
6. according to the method described in any one in claim 1-5, it is characterised in that be coated with the side of described titanium dioxide medicinal liquid
Formula is the one in spraying, spin coating and blade coating.
7. according to the method described in any one in claim 1-6, it is characterised in that also include step 4: in described scattering
Anode is formed on Ceng；Step 5: form organic electroluminescence structure on described anode；And step 6: at described Organic Electricity
Negative electrode is formed in photoluminescence structure.
8. the OLED prepared according to the method described in any one in claim 1-6, it is characterised in that described
OLED includes substrate and scattering layer；The most also include the anode being formed at described scattering layer, be formed on described anode
Organic electroluminescence structure, and be formed at the negative electrode on described organic electroluminescence structure.
OLED the most according to claim 8, it is characterised in that the thickness of described scattering layer is 5-30 μm；It is preferably
5-20 μm, most preferably 10-15 μm.
OLED the most according to claim 8 or claim 9, it is characterised in that the particle diameter of the titanium dioxide in described scattering layer
For 0.5-15 μm；Preferably 5-12 μm.
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Citations (6)
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| CN102709489A (en) * | 2012-05-31 | 2012-10-03 | 昆山维信诺显示技术有限公司 | Preparation method for high-refractivity scattering layer and preparation method for organic light-emitting diode (OLED) with high luminous efficiency |
| CN103378309A (en) * | 2012-04-28 | 2013-10-30 | 海洋王照明科技股份有限公司 | Organic light-emitting device and manufacturing method thereof |
| CN103682135A (en) * | 2012-09-05 | 2014-03-26 | 海洋王照明科技股份有限公司 | Organic electroluminescence device and preparation method thereof |
| CN103682126A (en) * | 2012-08-31 | 2014-03-26 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| CN103700781A (en) * | 2013-12-25 | 2014-04-02 | 京东方科技集团股份有限公司 | Organic light-emitting device, display substrate and organic electroluminescence display |
| US20150287941A1 (en) * | 2012-11-30 | 2015-10-08 | Lg Chem, Ltd. | Substrate for organic electronic device |
-
2016
- 2016-07-15 CN CN201610559550.6A patent/CN106206980A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378309A (en) * | 2012-04-28 | 2013-10-30 | 海洋王照明科技股份有限公司 | Organic light-emitting device and manufacturing method thereof |
| CN102709489A (en) * | 2012-05-31 | 2012-10-03 | 昆山维信诺显示技术有限公司 | Preparation method for high-refractivity scattering layer and preparation method for organic light-emitting diode (OLED) with high luminous efficiency |
| CN103682126A (en) * | 2012-08-31 | 2014-03-26 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| CN103682135A (en) * | 2012-09-05 | 2014-03-26 | 海洋王照明科技股份有限公司 | Organic electroluminescence device and preparation method thereof |
| US20150287941A1 (en) * | 2012-11-30 | 2015-10-08 | Lg Chem, Ltd. | Substrate for organic electronic device |
| CN103700781A (en) * | 2013-12-25 | 2014-04-02 | 京东方科技集团股份有限公司 | Organic light-emitting device, display substrate and organic electroluminescence display |
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Application publication date: 20161207 |