CN103490020A - Organic electroluminescence device, manufacturing method thereof, display device and illuminating device - Google Patents
Organic electroluminescence device, manufacturing method thereof, display device and illuminating device Download PDFInfo
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Abstract
The invention provides an organic electroluminescence device, a manufacturing method thereof, a display device and an illuminating device, and belongs to the field of organic electroluminescence. The organic electroluminescence device comprises a substrate, an anode layer, an organic luminance layer and a cathode layer. The organic electroluminescence device further comprises a transparent covering layer which is arranged on the cathode layer and has the refractive index larger than a preset value, and a plurality of protrusions are distributed on the surface of the transparent covering layer. According to the technical scheme, total reflection, on the covering layer, of emergent rays inside the OLED device can be reduced, the light extraction efficiency of the OLED device can be improved, and therefore the external quantum efficiency of the OLED device is improved.
Description
Technical field
The present invention relates to the organic electroluminescent field, refer to especially a kind of organic electroluminescence device and preparation method thereof, display unit, lighting device.
Background technology
Organic electroluminescence device (OLED), because it has self-luminous, all solid state, wide visual angle, responds the plurality of advantages such as fast and be considered to that huge application prospect is arranged in flat panel display, is the flat panel display product of new generation after liquid crystal (LCD), plasma (PDP).OLED is widely used in the display and lighting field at present, have higher functional reliability and lower energy consumption in order to ensure the OLED device, need to improve as much as possible the external quantum efficiency (External quantum efficiency) of semiconductor light-emitting elements in the OLED device.
In general, the external quantum efficiency of OLED depends on that its internal quantum (internal quantum efficiency) and light take out efficiency, wherein internal quantum is determined by characteristic and the device architecture of material itself, therefore in the situation that internal quantum can't effectively promote, the light taking-up efficiency that increases OLED is particularly important.
Improving light taking-up efficiency is that the light that OLED inside is launched causes outside the OLED device as much as possible, for top emission OLED device, its negative electrode is translucent metal electrode, therefore emergent light increases in the reflection of negative electrode, and causes the multi-photon beam interferometer, microcavity effect very obviously, therefore need on negative electrode, cover the material that one deck refractive index is high, as cathode coating (capping layer, CPL), to weaken microcavity effect, make the fairing profit of OLED device inside penetrate the OLED surface.But because the refractive index of cathode coating is higher, generally higher than air refraction, make emergent ray again total reflection can occur in cathode coating inside, cause the loss of emergent ray.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of organic electroluminescence device and preparation method thereof, display unit, lighting device, can reduce OLED device inside emergent ray in tectal total reflection, the light that improves the OLED device takes out efficiency, and then improves the external quantum efficiency of OLED device.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:
On the one hand, a kind of organic electroluminescence device is provided, comprise substrate, anode layer, organic luminous layer and cathode layer, described organic electroluminescence device also comprise be arranged on described cathode layer, transparent covering layer that refractive index is greater than preset value, the surface distributed of described transparent covering layer has a plurality of projections.
Further, the refractive index of described transparent covering layer is greater than 1.5.
Further, described transparent covering layer includes the first antireflection layer and the second antireflection layer, and described the first antireflection layer is identical with the material of described the second antireflection layer, and described the second antireflection layer is comprised of a plurality of described bump array.
Further, the height of described the first antireflection layer equals λ/(4n), and wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent covering layer.
Further, the Breadth Maximum of described projection is no more than 200 microns, and the maximum length of described projection is no more than 400 microns.
Further, the height of described projection is greater than λ/(4n), and wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent covering layer.
Further, the spacing between described projection is less than 200 microns.
Further, described projection is cuboid, cone, cylinder, hemisphere or polyhedron.
The embodiment of the present invention also provides a kind of display unit, comprises organic electroluminescence device as above.
The embodiment of the present invention also provides a kind of lighting device, comprises organic electroluminescence device as above.
The embodiment of the present invention also provides a kind of manufacture method of organic electroluminescence device, and described organic electroluminescence device includes substrate, anode layer, organic luminous layer and cathode layer, and described manufacture method comprises:
Form refractive index and be greater than the transparent covering layer that preset value, surface distributed have a plurality of projections on described cathode layer.
Further, described manufacture method specifically comprises:
One substrate is provided;
Form the anode layer formed by metal material on described substrate;
Form organic luminous layer on described anode layer;
Form the cathode layer formed by metal material on described organic luminous layer;
Form refractive index and be greater than the transparent covering layer that preset value, surface distributed have a plurality of projections on described cathode layer, described transparent covering layer includes the first antireflection layer and the second antireflection layer, described the first antireflection layer is identical with the material of described the second antireflection layer, and described the second antireflection layer is comprised of a plurality of described bump array.
It is further, described that on described cathode layer, the formation refractive index is greater than preset value, surface distributed has the transparent covering layer of a plurality of projections to comprise:
Deposition ground floor transparent material on described cathode layer, the refractive index of described transparent material is greater than 1.5;
On the described transparent material of ground floor, the described transparent material of the deposition second layer, utilize mask plate to be impressed the described transparent material of the second layer, forms and be distributed in a plurality of projections on the described transparent material of ground floor.
Further, the described ground floor transparent material that deposits on described cathode layer comprises:
Utilize the hot evaporation coating method described transparent material of ground floor that deposit thickness is λ/(4n) on described cathode layer, wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent material;
The described described transparent material of the second layer that deposits on the described transparent material of ground floor comprises:
Utilize hot evaporation coating method or spraying or inkjet printing or electron beam evaporation deposit thickness on the described transparent material of ground floor to be greater than the described transparent material of the second layer of λ/(4n).
Embodiments of the invention have following beneficial effect:
In such scheme, be provided with refractive index and be greater than preset value on the cathode layer of OLED device, surface distributed has the transparent covering layer of a plurality of projections, because projection has and angled of horizontal plane, so when the internal light of OLED device penetrates projection, can reduce the incidence angle of emergent ray, the incidence angle that makes the script incidence angle be greater than the emergent ray of critical angle is less than critical angle, thereby reduce the total reflection of emergent ray in transparent covering layer inside, reduce the light loss of emergent ray, the light that improves the OLED device takes out efficiency, and then the external quantum efficiency of raising OLED device.
The accompanying drawing explanation
Fig. 1 is the structural representation of existing organic electroluminescence device;
The structural representation of Fig. 2 is the embodiment of the present invention one employing mask plate;
The structural representation that Fig. 3 is the embodiment of the present invention one organic electroluminescence device;
The structural representation of Fig. 4 is the embodiment of the present invention two employing mask plate;
The structural representation that Fig. 5 is the embodiment of the present invention two organic electroluminescence devices;
The structural representation of Fig. 6 is the embodiment of the present invention three employing mask plate;
The structural representation that Fig. 7 is the embodiment of the present invention three organic electroluminescence devices.
Reference numeral
1 substrate 2 cathode layer 3 organic luminous layers
4 anode layer 5 transparent covering layer 6 projections
7 mask plate 8 mask patterns
Embodiment
For technical problem, technical scheme and advantage that embodiments of the invention will be solved is clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Total reflection occurs for emergent ray in prior art in the inner meeting of cathode coating in embodiments of the invention, the problem that causes the loss of emergent ray, a kind of organic electroluminescence device and preparation method thereof, display unit are provided, can reduce OLED device inside emergent ray in tectal total reflection, the light that improves the OLED device takes out efficiency, and then improves the external quantum efficiency of OLED device.
The embodiment of the present invention provides a kind of organic electroluminescence device, comprise substrate, anode layer, organic luminous layer and cathode layer, wherein, described organic electroluminescence device also comprise be arranged on described cathode layer, transparent covering layer that refractive index is greater than preset value, the surface distributed of described transparent covering layer has a plurality of projections.
Be provided with refractive index on the cathode layer of OLED device of the present invention and be greater than preset value, surface distributed has the transparent covering layer of a plurality of projections, because projection has and angled of horizontal plane, so when the internal light of OLED device penetrates projection, can reduce the incidence angle of emergent ray, the incidence angle that makes the script incidence angle be greater than the emergent ray of critical angle is less than critical angle, thereby reduce the total reflection of emergent ray in transparent covering layer inside, reduce the light loss of emergent ray, the light that improves the OLED device takes out efficiency, and then the external quantum efficiency of raising OLED device.
Particularly, the refractive index of described transparent covering layer is greater than 1.5.
Particularly, described transparent covering layer includes the first antireflection layer and the second antireflection layer, and described the first antireflection layer is identical with the material of described the second antireflection layer, and described the second antireflection layer is comprised of a plurality of described bump array.
Wherein, the height of described the first antireflection layer equals λ/(4n), and wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent covering layer.
Take out efficiency for the light that improves as much as possible the OLED device in addition, the size of described projection preferably is not more than the size of a pixel, particularly, the Breadth Maximum of described projection is no more than 200 microns, the maximum length of described projection is no more than 400 microns, and the height of described projection is greater than λ/(4n), and wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent covering layer, the height of concrete projection can be the 1-2 micron.The shape of described projection is specifically as follows cuboid, cone, cylinder, hemisphere, irregular polyhedrons or regular polyhedron.
When this organic electroluminescence device is applied to display unit, in order to guarantee display effect, the spacing between projection need to be less than the length of the minor face of display panel pixel, and particularly, the spacing between described projection can be less than 200 microns.
The embodiment of the present invention also provides a kind of display unit, comprises organic electroluminescence device as above.Wherein, the structure of organic electroluminescence device, with above-mentioned embodiment, does not repeat them here.In addition, the structure of other parts of display unit can, with reference to prior art, be not described in detail this this paper.This display unit can be: Electronic Paper, TV, display, DPF, mobile phone, panel computer etc. have product or the parts of any Presentation Function.
The embodiment of the present invention also provides a kind of lighting device, comprises organic electroluminescence device as above.Wherein, the structure of organic electroluminescence device, with above-mentioned embodiment, does not repeat them here.In addition, the structure of other parts of lighting device can, with reference to prior art, be not described in detail this this paper.
The embodiment of the present invention also provides a kind of manufacture method of organic electroluminescence device, and described organic electroluminescence device includes substrate, anode layer, organic luminous layer and cathode layer, and described manufacture method comprises:
Form refractive index and be greater than the transparent covering layer that preset value, surface distributed have a plurality of projections on described cathode layer.
The manufacture method of OLED device of the present invention is provided with refractive index and is greater than preset value on cathode layer, surface distributed has the transparent covering layer of a plurality of projections, because projection has and angled of horizontal plane, so when the internal light of OLED device penetrates projection, can reduce the incidence angle of emergent ray, the incidence angle that makes the script incidence angle be greater than the emergent ray of critical angle is less than critical angle, thereby reduce the total reflection of emergent ray in transparent covering layer inside, reduce the light loss of emergent ray, the light that improves the OLED device takes out efficiency, and then the external quantum efficiency of raising OLED device.
Particularly, described manufacture method comprises:
One substrate is provided;
Form the anode layer formed by metal material on described substrate;
Form organic luminous layer on described anode layer;
Form the cathode layer formed by metal material on described organic luminous layer;
Form refractive index and be greater than the transparent covering layer that preset value, surface distributed have a plurality of projections on described cathode layer, described transparent covering layer includes the first antireflection layer and the second antireflection layer, described the first antireflection layer is identical with the material of described the second antireflection layer, and described the second antireflection layer is comprised of a plurality of described bump array.
It is further, described that on described cathode layer, the formation refractive index is greater than preset value, surface distributed has the transparent covering layer of a plurality of projections to comprise:
Deposition ground floor transparent material on described cathode layer, the refractive index of described transparent material is greater than 1.5;
On the described transparent material of ground floor, the described transparent material of the deposition second layer, utilize mask plate to be impressed the described transparent material of the second layer, forms and be distributed in a plurality of projections on the described transparent material of ground floor.
Further, the described ground floor transparent material that deposits on described cathode layer comprises:
Utilize the hot evaporation coating method described transparent material of ground floor that deposit thickness is λ/(4n) on described cathode layer, wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent material;
The described described transparent material of the second layer that deposits on the described transparent material of ground floor comprises:
Utilize hot evaporation coating method or spraying or inkjet printing or electron beam evaporation deposit thickness on the described transparent material of ground floor to be greater than the described transparent material of the second layer of λ/(4n), wherein, ground floor transparent material and second layer transparent material are identical transparent material.
Below in conjunction with specific embodiment, organic electroluminescence device of the present invention and preparation method thereof is described in detail:
Embodiment mono-
The manufacture method of the organic electroluminescence device of the present embodiment comprises:
Step a1: a substrate 1 is provided, and substrate 1 can be glass substrate or quartz base plate;
Step a2: form the anode layer 2 formed by metal material on substrate 1;
The organic electroluminescence device of the present embodiment is top illuminating device, therefore, anode layer is opaque metal material, particularly, the anode layer 2 that can on substrate 1, utilize magnetron sputtering, thermal evaporation or other film build method deposition to be formed by metal material, the metal material that metal material is high reflectance can be Ag or Al.
Step a3: form organic luminous layer 3 on anode layer 2;
Particularly, the method that can on anode layer 2, utilize hot evaporation is evaporation hole injection layer (HIL), hole transmission layer (HTL), luminescent layer (EML), electron transfer layer (ETL) and electron injecting layer (EIL) successively, forms organic luminous layer 3.
Step a4: form cathode layer 4 on organic luminous layer 3;
Particularly, the cathode layer 4 that can on organic luminous layer 3, utilize the method deposition of hot evaporation to be formed by metal material, metal material can be at least one in Al, Ag and Mg, in order to guarantee the light transmission of cathode layer, the thickness of cathode layer is preferably 10-30nm.
Step a5: form surface and there are a plurality of transparent covering layers of protruding 65 on cathode layer 4, obtain OLED device as shown in Figure 3.
Particularly, can utilize the hot evaporation coating method ground floor transparent material that deposit thickness is λ/(4n) on cathode layer 4, wherein λ is OLED device emission optical wavelength, the refractive index that n is transparent material, the refractive index of the transparent material of generally selecting is greater than 1.5, and transparent material can be that organic material can be also inorganic material, and inorganic material comprises ZnO, ZnSe, TiO
2, SiN
3etc., organic material comprises NPB, Alq
3deng.Recycle hot evaporation coating method or spraying or inkjet printing or electron beam evaporation deposit thickness on the ground floor transparent material and be greater than λ/(4n), be specifically as follows the second layer transparent material of 1-2 micron, ground floor transparent material and second layer transparent material are identical transparent material.Utilize mask plate as shown in Figure 2 to be impressed second layer transparent material, form and be distributed in a plurality of cuboid projections on the ground floor transparent material, obtain structure as shown in Figure 3.Can find out, the mask pattern 8 on mask plate 7 is also to be cuboid, therefore, utilizes 7 pairs of second layer transparent materials of mask plate to be impressed, and can obtain being distributed in a plurality of cuboid projections on the ground floor transparent material.The size of mask pattern 8 determines according to the display screen matrix size, generally is no more than a pixel size.
Fig. 1 is the structural representation of existing organic electroluminescence device, as shown in Figure 1, because the refractive index ratio of transparent covering layer 5 is higher, make emergent ray when penetrating transparent covering layer 5, when incidence angle is greater than critical angle, can, in the inner generation total reflection of transparent covering layer 5, cause the loss of emergent ray.
As shown in Figure 3, transparent covering layer 5 surface distributed of the organic electroluminescence device of the present embodiment have a plurality of cuboid projections, because the cuboid projection has the face vertical with horizontal plane, so when the internal light of OLED device penetrates the cuboid projection, the incidence angle of part emergent ray on this face can be less than the incidence angle on horizontal plane originally, make the incidence angle that is greater than critical angle originally be less than critical angle, thereby make this part emergent ray penetrate smoothly transparent covering layer, reduce the total reflection of emergent ray in transparent covering layer inside, reduce the light loss of emergent ray, the light that improves the OLED device takes out efficiency, and then the external quantum efficiency of raising OLED device.
Embodiment bis-
The manufacture method of the organic electroluminescence device of the present embodiment comprises:
Step b1: a substrate 1 is provided, and substrate 1 can be glass substrate or quartz base plate;
Step b2: form the anode layer 2 formed by metal material on substrate 1;
The organic electroluminescence device of the present embodiment is top illuminating device, therefore, anode layer is opaque metal material, particularly, the anode layer 2 that can on substrate 1, utilize magnetron sputtering, thermal evaporation or other film build method deposition to be formed by metal material, the metal material that metal material is high reflectance can be Ag or Al.
Step b3: form organic luminous layer 3 on anode layer 2;
Particularly, the method that can on anode layer 2, utilize hot evaporation is evaporation hole injection layer (HIL), hole transmission layer (HTL), luminescent layer (EML), electron transfer layer (ETL) and electron injecting layer (EIL) successively, forms organic luminous layer 3.
Step b4: form cathode layer 4 on organic luminous layer 3;
Particularly, the cathode layer 4 that can on organic luminous layer 3, utilize the method deposition of hot evaporation to be formed by metal material, metal material can be at least one in Al, Ag and Mg, in order to guarantee the light transmission of cathode layer, the thickness of cathode layer is preferably 10-30nm.
Step b5: form surface and there are a plurality of transparent covering layers of protruding 65 on cathode layer 4, obtain OLED device as shown in Figure 5.
Particularly, can utilize the hot evaporation coating method ground floor transparent material that deposit thickness is λ/(4n) on cathode layer 4, wherein λ is OLED device emission optical wavelength, the refractive index that n is transparent material, the refractive index of the transparent material of generally selecting is greater than 1.5, and transparent material can be that organic material can be also inorganic material, and inorganic material comprises ZnO, ZnSe, TiO
2, SiN
3etc., organic material comprises NPB, Alq
3deng.Recycle hot evaporation coating method or spin coating or inkjet printing or electron beam evaporation deposit thickness on the ground floor transparent material and be greater than λ/(4n), be specifically as follows the second layer transparent material of 1-2 micron, ground floor transparent material and second layer transparent material are identical transparent material.Utilize mask plate as shown in Figure 4 to be impressed second layer transparent material, form and be distributed in a plurality of hemisphere projections on the ground floor transparent material, obtain structure as shown in Figure 5.Can find out, the mask pattern 8 on mask plate 7 is also to be hemisphere, therefore, utilizes 7 pairs of second layer transparent materials of mask plate to be impressed, and can obtain being distributed in a plurality of hemisphere projections on the ground floor transparent material.The size of mask pattern 8 determines according to the display screen matrix size, generally is no more than a pixel size.
Fig. 1 is the structural representation of existing organic electroluminescence device, as shown in Figure 1, because the refractive index ratio of transparent covering layer 5 is higher, make emergent ray when penetrating transparent covering layer 5, when incidence angle is greater than critical angle, can, in the inner generation total reflection of transparent covering layer 5, cause the loss of emergent ray.
As shown in Figure 5, transparent covering layer 5 surface distributed of the organic electroluminescence device of the present embodiment have a plurality of hemisphere projections, because the hemisphere projection has and angled of horizontal plane, so when the internal light of OLED device penetrates the hemisphere projection, the part emergent ray with angled of horizontal plane on incidence angle can be less than the incidence angle on horizontal plane originally, make the incidence angle that is greater than critical angle originally be less than critical angle, thereby make this part emergent ray penetrate smoothly transparent covering layer, reduce the total reflection of emergent ray in transparent covering layer inside, reduce the light loss of emergent ray, the light that improves the OLED device takes out efficiency, and then the external quantum efficiency of raising OLED device.
Embodiment tri-
The manufacture method of the organic electroluminescence device of the present embodiment comprises:
Step c1: a substrate 1 is provided, and substrate 1 can be glass substrate or quartz base plate;
Step c2: form the anode layer 2 formed by metal material on substrate 1;
The organic electroluminescence device of the present embodiment is top illuminating device, therefore, anode layer is opaque metal material, particularly, the anode layer 2 that can on substrate 1, utilize magnetron sputtering, thermal evaporation or other film build method deposition to be formed by metal material, the metal material that metal material is high reflectance can be Ag or Al.
Step c3: form organic luminous layer 3 on anode layer 2;
Particularly, the method that can on anode layer 2, utilize hot evaporation is evaporation hole injection layer (HIL), hole transmission layer (HTL), luminescent layer (EML), electron transfer layer (ETL) and electron injecting layer (EIL) successively, forms organic luminous layer 3.
Step c4: form cathode layer 4 on organic luminous layer 3;
Particularly, the cathode layer 4 that can on organic luminous layer 3, utilize the method deposition of hot evaporation to be formed by metal material, metal material can be at least one in Al, Ag and Mg, in order to guarantee the light transmission of cathode layer, the thickness of cathode layer is preferably 10-30nm.
Step a5: form surface and there are a plurality of transparent covering layers of protruding 65 on cathode layer 4, obtain OLED device as shown in Figure 7.
Particularly, can utilize the hot evaporation coating method ground floor transparent material that deposit thickness is λ/(4n) on cathode layer 4, wherein λ is optical wavelength, the refractive index that n is transparent material, the refractive index of the transparent material of generally selecting is greater than 1.5, and transparent material can be that organic material can be also inorganic material, and inorganic material comprises ZnO, ZnSe, TiO
2, SiN
3etc., organic material comprises NPB, Alq
3deng.Recycle hot evaporation coating method or spraying or inkjet printing or electron beam evaporation deposit thickness on the ground floor transparent material and be greater than λ/(4n), be specifically as follows the second layer transparent material of 1-2 micron, ground floor transparent material and second layer transparent material are identical transparent material.Utilize mask plate as shown in Figure 6 to be impressed second layer transparent material, form and be distributed in a plurality of tapered protrusion on the ground floor transparent material, obtain structure as shown in Figure 7.Can find out, the mask pattern 8 on mask plate 7 is also tapered, therefore, utilizes 7 pairs of second layer transparent materials of mask plate to be impressed, and can obtain being distributed in a plurality of tapered protrusion on the ground floor transparent material.The size of mask pattern 8 determines according to the display screen matrix size, generally is no more than a pixel size.
Fig. 1 is the structural representation of existing organic electroluminescence device, as shown in Figure 1, because the refractive index ratio of transparent covering layer 5 is higher, make emergent ray when penetrating transparent covering layer 5, when incidence angle is greater than critical angle, can, in the inner generation total reflection of transparent covering layer 5, cause the loss of emergent ray.
As shown in Figure 7, transparent covering layer 5 surface distributed of the organic electroluminescence device of the present embodiment have a plurality of tapered protrusion, because tapered protrusion has and the angled surface of horizontal plane, so when the internal light of OLED device penetrates tapered protrusion, the incidence angle of emergent ray on conical surface can be less than the incidence angle on horizontal plane originally, make the incidence angle that is greater than critical angle originally be less than critical angle, thereby make emergent ray penetrate smoothly transparent covering layer, reduce the total reflection of emergent ray in transparent covering layer inside, reduce the light loss of emergent ray, the light that improves the OLED device takes out efficiency, and then the external quantum efficiency of raising OLED device.
In addition to the implementation, the transparent covering layer surface of OLED device of the present invention can also form the projection of other shapes, such as cylinder, polyhedron etc., as long as the projection formed has the face with horizontal plane angled (this angle is not 0 ° or 180 °).
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. an organic electroluminescence device, comprise substrate, anode layer, organic luminous layer and cathode layer, it is characterized in that, described organic electroluminescence device also comprise be arranged on described cathode layer, transparent covering layer that refractive index is greater than preset value, the surface distributed of described transparent covering layer has a plurality of projections.
2. organic electroluminescence device as claimed in claim 1, is characterized in that, the refractive index of described transparent covering layer is greater than 1.5.
3. organic electroluminescence device as claimed in claim 1, is characterized in that,
Described transparent covering layer includes the first antireflection layer and the second antireflection layer, and described the first antireflection layer is identical with the material of described the second antireflection layer, and described the second antireflection layer is comprised of a plurality of described bump array.
4. organic electroluminescence device as claimed in claim 3, is characterized in that, the height of described the first antireflection layer equals λ/(4n), and wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent covering layer.
5. organic electroluminescence device as claimed in claim 1, is characterized in that, the Breadth Maximum of described projection is no more than 200 microns, and the maximum length of described projection is no more than 400 microns.
6. organic electroluminescence device as claimed in claim 1, is characterized in that, the height of described projection is greater than λ/(4n), and wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent covering layer.
7. organic electroluminescence device as claimed in claim 1, is characterized in that, the spacing between described projection is less than 200 microns.
8. organic electroluminescence device as described as any one in claim 1-7, is characterized in that, described projection is cuboid, cone, cylinder, hemisphere or polyhedron.
9. a display unit, is characterized in that, comprises organic electroluminescence device as described as any one in claim 1-8.
10. a lighting device, is characterized in that, comprises organic electroluminescence device as described as any one in claim 1-8.
11. the manufacture method of an organic electroluminescence device, described organic electroluminescence device includes substrate, anode layer, organic luminous layer and cathode layer, it is characterized in that, described manufacture method comprises:
Form refractive index and be greater than the transparent covering layer that preset value, surface distributed have a plurality of projections on described cathode layer.
12. the manufacture method of organic electroluminescence device as claimed in claim 11, is characterized in that, described manufacture method specifically comprises:
One substrate is provided;
Form the anode layer formed by metal material on described substrate;
Form organic luminous layer on described anode layer;
Form the cathode layer formed by metal material on described organic luminous layer;
Form refractive index and be greater than the transparent covering layer that preset value, surface distributed have a plurality of projections on described cathode layer, described transparent covering layer includes the first antireflection layer and the second antireflection layer, described the first antireflection layer is identical with the material of described the second antireflection layer, and described the second antireflection layer is comprised of a plurality of described bump array.
13. the manufacture method of organic electroluminescence device as claimed in claim 12, is characterized in that, described on described cathode layer, the formation refractive index is greater than preset value, surface distributed has the transparent covering layer of a plurality of projections to comprise:
Deposition ground floor transparent material on described cathode layer, the refractive index of described transparent material is greater than 1.5;
On the described transparent material of ground floor, the described transparent material of the deposition second layer, utilize mask plate to be impressed the described transparent material of the second layer, forms and be distributed in a plurality of projections on the described transparent material of ground floor.
14. the manufacture method of organic electroluminescence device as claimed in claim 13, is characterized in that, the described ground floor transparent material that deposits on described cathode layer comprises:
Utilize the hot evaporation coating method described transparent material of ground floor that deposit thickness is λ/(4n) on described cathode layer, wherein λ is organic electroluminescence device emission optical wavelength, the refractive index that n is described transparent material;
The described described transparent material of the second layer that deposits on the described transparent material of ground floor comprises:
Utilize hot evaporation coating method or spraying or inkjet printing or electron beam evaporation deposit thickness on the described transparent material of ground floor to be greater than the described transparent material of the second layer of λ/(4n).
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393179A (en) * | 2014-10-16 | 2015-03-04 | 京东方科技集团股份有限公司 | Organic light-emitting diode, illuminating apparatus, and display apparatus |
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| CN107425140A (en) * | 2017-09-12 | 2017-12-01 | 武汉华星光电半导体显示技术有限公司 | A kind of OLED structure |
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| CN112201682A (en) * | 2020-10-13 | 2021-01-08 | 云谷（固安）科技有限公司 | Display panel, display device and preparation method of display panel |
| CN112987368A (en) * | 2021-02-08 | 2021-06-18 | 武汉华星光电技术有限公司 | Array substrate, liquid crystal display panel and liquid crystal display device |
| CN112987368B (en) * | 2021-02-08 | 2023-12-26 | 武汉华星光电技术有限公司 | Array substrate, liquid crystal display panel and liquid crystal display device |
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