CN107611276B - Organic Light Emitting Diode and display panel - Google Patents
Organic Light Emitting Diode and display panel Download PDFInfo
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Abstract
The disclosure provides a kind of Organic Light Emitting Diode and display panel, belongs to field of display technology.The luminescent layer between first electrode, second electrode and first electrode and second electrode that the Organic Light Emitting Diode includes: substrate, is disposed on the substrate, luminescent layer includes: the first blue light unit, yellow light unit and the first articulamentum, and the first blue light unit is connected with yellow light unit by the first articulamentum；Wherein yellow light unit has the structure in a shared main body doped with red dopant and green-doped object, and red dopant is opposite with the trend of doping ratio of the green-doped object in shared main body.The structure of the disclosure is easy to adjust the luminous ratio of red green unit, so that the light intensity ratio of the two is stablized, thus it is compound later photochromic more stable with blue light unit, reach preferable display effect.Exciton recombination rate can be improved, avoid it is compound after exciton spread to the functional layer on both sides, and then reduce exciton it is mobile caused by be quenched, improve luminous efficiency.
Description
Technical field
This disclosure relates to field of display technology, in particular to a kind of Organic Light Emitting Diode and display panel.
Background technique
In recent years, OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) display device due to
It is provided simultaneously with self-luminous, is not required to that backlight, contrast are high, thickness is thin, visual angle is wide, reaction speed is fast, is applicable to flexibility
The advantages such as panel, use temperature range be wide, it is considered to be the mainstream technology of next generation's display.Due to the flat luminous spy of OLED
Property, WOLED (White Organic Light Emitting Diode, two pole of white light organic electroluminescence can also be made into
Pipe), for doing the backlight of solid-state lighting light source or liquid crystal display.
Large scale OLED shows the hatching effect due to FMM (Fine Metal Mask, high-precision metal mask plate), needs
Using IJP, (the plated film mode of (Ink Jet Printing, inkjet printing technology), mostly uses WOLED+CF (Color at present
Filter, colored filter) mode realize colored display, WOLED mostly uses Tandem cascaded structure, such as can be using mutual
Complementary color blue light (B)+yellow light (Y) realization, i.e. B+Y Unit two；Or it is realized using red (R) green (G) blue (B) three primary colours, i.e. B+R/G
Unit two.In order to improve colour cast while improve blue lifetime, can also be realized using B+Y+B or B+R/G+B Unit tri-, R/G
The yellow light colour gamut of formation is much better than the yellow light colour gamut of simple Y, therefore WOLED is mostly realized using R/G, but in actual process
R, G electron-hole recombinations proportion adjustment is more complicated, and red green unit intensity is photochromic to be not easily controlled, and influences display effect.
Therefore, there is also the places that has much room for improvement for technical solution in the prior art.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
The disclosure is designed to provide a kind of Organic Light Emitting Diode and display panel, and then at least to a certain extent
Overcome the problems, such as caused by the limitation and defect due to the relevant technologies one or more.
Other characteristics and advantages of the disclosure will be apparent from by the following detailed description, or partially by this public affairs
The practice opened and acquistion.
According to one aspect of the disclosure, a kind of Organic Light Emitting Diode is provided, comprising: substrate is arranged in the substrate
On first electrode, the luminescent layer between second electrode and the first electrode and the second electrode, the luminescent layer packet
It includes:
First blue light unit, yellow light unit and the first articulamentum, the first blue light unit and the yellow light unit are logical
Cross the first articulamentum series connection；
Wherein the yellow light unit has the structure in a shared main body doped with red dopant and green-doped object, and
The trend that the red dopant and doping ratio of the green-doped object in the shared main body change in the same direction
On the contrary.
It include the first main body and the second main body, institute in the shared main body in a kind of exemplary embodiment of the disclosure
It states doped with the red dopant and the green-doped object in the first main body and second main body, and doping ratio is not
Together.
In a kind of exemplary embodiment of the disclosure, the red dopant and the green-doped object are shared described
Doping way in main body is grade doping.
In a kind of exemplary embodiment of the disclosure, the red dopant and the green-doped object are described first
Trend that doping ratio in main body changes in the same direction on the contrary, the red dopant with the green-doped object described
The trend that doping ratio in second main body changes in the same direction is also opposite.
In a kind of exemplary embodiment of the disclosure, the ratio that first main body accounts for the shared main body is less than described
Second main body accounts for the ratio of the shared main body, wherein first main body is biased to transporting holes, second main body is biased to pass
Transmission of electricity.
In a kind of exemplary embodiment of the disclosure, first main body have electronic blocking layer function, described second
Main body has hole barrier layer function.
In a kind of exemplary embodiment of the disclosure, the triplet T1 energy level of the shared main body is than the red doping
At least big 0.2eV of the triplet T1 energy level of object or the green-doped object.
In a kind of exemplary embodiment of the disclosure, the triplet T1 energy level range of the shared main body be 2.5eV~
6.0eV。
In a kind of exemplary embodiment of the disclosure, the luminescent layer further include: the second blue light unit and the second connection
Layer, the second blue light unit is connected with the yellow light unit by second articulamentum, wherein the first blue light unit
Close to the first electrode, the second blue light unit is close to the second electrode.
According to the second aspect of the disclosure, a kind of display panel, including above-described Organic Light Emitting Diode are also provided.
The Organic Light Emitting Diode and display panel that some embodiments of the disclosure provide, the Huang in Organic Light Emitting Diode
Light unit has the structure shared in main body doped with red dopant and green-doped object, and doping ratio trend is on the contrary, logical
It crosses red green dopant and shares main body realization energy transfer, be easy to adjust the luminous ratio of red green unit, so that the beam intensity ratio of the two
Example is stablized, thus it is compound later photochromic more stable with blue light unit, reach preferable display effect.Device can not only be thinned
The integral thickness of part, moreover it is possible to reduce the number of organic line source, simplify technique, reduce processing cost and waiting time.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.It should be evident that the accompanying drawings in the following description is only the disclosure
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 shows a kind of structural schematic diagram of the Organic Light Emitting Diode provided in one embodiment of the disclosure.
Fig. 2 shows yellow light unit excitonic motion track and luminous schematic diagrames in one embodiment of the disclosure.
Fig. 3 shows in one embodiment of the disclosure host-guest system schematic diagram in yellow light unit.
Fig. 4 shows a kind of structural schematic diagram of the Organic Light Emitting Diode provided in another embodiment of the disclosure.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Attached drawing is only the disclosure
Schematic illustrations, be not necessarily drawn to scale.Identical appended drawing reference indicates same or similar part in figure, thus
Repetition thereof will be omitted.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In mode.In the following description, many details are provided to provide and fully understand to embodiment of the present disclosure.So
And it will be appreciated by persons skilled in the art that one in the specific detail can be omitted with technical solution of the disclosure
Or more, or can be using other methods, constituent element, device, step etc..In other cases, it is not shown in detail or describes
Known features, method, apparatus, realization, material or operation are to avoid a presumptuous guest usurps the role of the host and all aspects of this disclosure is made to become mould
Paste.
Herein, " inside ", " outside " directional terminology refer respectively to towards the side of liquid crystal layer and away from liquid crystal layer
Side, for example, referring to one layer towards liquid crystal layer of underlay substrate on the inside of underlay substrate.In addition, "upper", "lower", " left side " with
And the directional terminologies such as " right side " are to illustrate the orientation put to define relative to display device in attached drawing.It is to be understood that above-mentioned
Directional terminology is opposite concept, they be used for relative to description and clarification, can be placed according to display device
The variation in orientation and correspondingly change.
Fig. 1 shows a kind of structural schematic diagram of the Organic Light Emitting Diode provided in one embodiment of the disclosure, organic hair
Optical diode can be WOLED.
As shown in Figure 1, the WOLED include: substrate 101, the first electrode being disposed on the substrate 102, second electrode 110 with
And the luminescent layer between first electrode 102 and second electrode 110, wherein luminescent layer includes: blue light unit 105, yellow light unit 107
And articulamentum 106, blue light unit 105 are connected with yellow light unit 107 by articulamentum 106；Wherein yellow light unit has altogether
With doped with the structure of red dopant (Dopant) and green-doped object, and red dopant and green-doped object exist in main body
It is opposite to share the trend that the doping ratio in main body changes in the same direction.
It should be noted that Organic Light Emitting Diode is referred to organic light-emitting diodes in the prior art in the present embodiment
The structure of pipe carries out the setting of each layer structure, and the present invention is without limitation, first electrode and second electrode are by being luminous
Layer provides driving voltage or driving current to make it shine.For example, first electrode can be to provide the anode in hole, it can be by saturating
Bright conductive material is formed, such as the TCO (transparent conductive oxide) including ITO (tin indium oxide), IZO (indium zinc oxide), but not
It is necessarily limited to this.Second electrode can be to provide the cathode of electronics, and can be formed by metal material or electroconductive resin, such as gold
(Au), silver-colored (Ag), aluminium (Al), molybdenum (Mo), magnesium (Mg) etc. or its alloy, but it is not necessarily limited to this.
In addition, as shown in Figure 1, also successively including: HIL between first electrode 102 and blue light unit 105 in the present embodiment
(Hole Injection Layer, hole injection layer) 103 and HTL (Hole Transport Layer, hole transmission layer)
104, it also successively include: EIL (Electron Injection Layer, electricity between second electrode 110 and yellow light unit 107
Sub- implanted layer) 109 and ETL (Electron Transport Layer, electron transfer layer) 108, in this way, injected electrons and sky
Cave can be divided into singlet state and triplet, exciton returns to base from excitation state in luminescent layer due to the compound generation exciton of coulomb interaction
Photon is discharged while state to shine, and is returned ground state from triplet excited state transition and is issued phosphorescence.Wherein hole injection layer 103 can help
Hole is injected into luminescent layer from anode (first electrode 102), and electron injecting layer 109 can help hole from anode (second electrode
110) it is injected into luminescent layer.Hole transmission layer 104 has the characteristics that lower HOMO energy level, stronger cavity transmission ability, often
It is NPB with material, and electron transfer layer 108 has stronger electronic receipt ability, common used material PBD.Finally, shown in Fig. 1
Organic Light Emitting Diode since substrate 101 successively are as follows: first electrode 102, hole injection layer 103, hole transmission layer 104,
Blue light unit 105, articulamentum 106, yellow light unit 107, electron transfer layer 108, electron injecting layer 109 and second electrode 110.
It should be noted that articulamentum (CGL layers) 106 includes n-CGL (ETL of Li doping) and P-CGL in the present embodiment
(HA-TCN or MO3Adulterate HTL).
The structure that blue light unit and yellow light unit in the present embodiment luminescent layer are all made of host-guest system, which is realized, to shine, and leads to
Often only use 1%~10% phosphorescence luminescent substance be incorporated in as guest materials accounted in luminescent layer 90% or more material of main part
In compound, guest materials is responsible for shining, and material of main part mainly transmits energy and prevents triplet state-triplet state energy from burying in oblivion.
The wherein blue dopant of middle incorporation, such as TBP, DSA-Ph, DB-1, DB-2 and DB-3 etc. based on blue light unit.
Yellow light unit in the present embodiment shares main body (co-host) using red dopant and green-doped object and carries out energy
Amount transfer, more red dopant mixes main body compared with the mode that green-doped object incorporation main body is separately adulterated,
Shared body-dopant is more easier to adjust the ratio of feux rouges and green light, and as shown in Figure 1, red green dopant is incorporated into altogether together
With in main body, being thinned the thickness of luminescent layer, and then the integral thickness of device is thinned.
Fig. 2 shows yellow light unit excitonic motion track in the present embodiment and luminous schematic diagrames, as shown in Fig. 2, yellow light unit
Shared main body in include the first main body (host1) 1071 and the second main body (host2) 1072, the first main body 1071 and second main
Doped with red dopant 1073 and green-doped object 1074 in body 1072, and doping ratio is different.Therefore in doping process
In, the trend that red dopant and doping ratio of the green-doped object in the first main body change in the same direction is on the contrary, red
The trend that dopant and doping ratio of the green-doped object in the second main body change in the same direction is also on the contrary, in the present embodiment
First main body and the second main body, that is, can be to red dopants and green doped with red dopant and green-doped object
Color dopant transmits energy, but Fig. 2 show ratio of the ratio greater than green-doped object of red dopant in the first main body,
The ratio of second main body Green dopant is greater than the ratio of red dopant.As shown in Fig. 2, red dopant 1073 and green
(energy difference between HOMO and LUMO is known as " band gap " to the band gap of dopant 1074, for measuring whether a molecule holds
Easily be excited: band gap is smaller, and molecule is easier to be excited) value is significantly less than the energy band of the first main body 1071, the second main body 1072
Gap value, to transfer energy to dopant.Structure that is shown in Figure 1 and combining articulamentum 106, close to second in Fig. 2
The electron transfer layer of main body 1072 is electron transfer layer 108 shown in FIG. 1, for giving electron-transport to the second main body 1072, Fig. 2
In close to the first main body 1071 hole transmission layer be articulamentum in hole transmission layer 104, for by hole transport give first
Main body 1071.
Fig. 3 shows in the present embodiment host-guest system schematic diagram in yellow light unit, as shown in figure 3, red dopant with it is green
Color dopant is grade doping sharing the doping way in main body, and red dopant is mixed with green-doped object as doping object
Enter into shared main body.And red dopant changes with green-doped object in the doping ratio shared in main body in the same direction
Trend on the contrary, taking what is shown in fig. 3 as an example, the mass percent of red dopant is in the first main body close to the one of hole transmission layer
Side is maximum value, and gradually small to centre is 0, and the mass percent of green-doped object is in the second main body close to electron transfer layer
Side is maximum value, and gradually small to centre is 0.
It should be noted that the first main body and the second main body do not divide explicitly in fact in the present embodiment, both can
Energy transmission occurs with red dopant and green-doped object, structure shown in Fig. 2 is that the first main body is more partial to transmission sky
With red dopant energy transmission occurs for cave, and the second main body is more partial to transmit electronics, and energy occurs with green-doped object and passes
For passing, usual non-radiative energy transfer mode is the transfer of Forster ability and Dexter energy transfer.
In the present embodiment, due to LUMO (the Lowest Unoccupied with higher of the first main body 1071
Molecular Orbital, lowest unoccupied molecular orbital) energy level, the first main body 1071 has the function of electronic blocking, can stop
Electrons spread is to adjacent functional layer.Second main body has lower HOMO (Highest Occupied Molecular
Orbital, highest occupied molecular orbital) energy level, have the function of hole barrier, hole can be stopped to be diffused into adjacent function
Layer, in this way due to electronics by the first body block in luminescent layer, greatly limit the path of electrons and holes, extend electronics
The recombination time in hole, enable the compound in luminescent layer of exciton maximum probability, the recombination rate of exciton is improved, to improve OLED
Luminous efficiency.
In the present embodiment, the ratio that the first main body accounts for shared main body accounts for the ratio of shared main body less than the second main body,
In the first main body be biased to transporting holes, the second main body is biased to transmission electronics, can make in yellow light unit electron transfer rate with
Hole transport rate is suitable, guarantees that exciton is compounded among luminescent layer, the same recombination rate for improving exciton, to improve OLED's
Luminous efficiency.
In the present embodiment, sharing main body has high triplet T1 energy level, can be to avoid the exciton after compound to both sides
Functional layer spreads and exciton is caused to be quenched, and improves luminous efficiency.The triplet T1 energy level for wherein sharing main body depends primarily on
The triplet T1 energy level of red dopant, red dopant, energy level range is 2.5eV~6.0eV, wherein preferably energy level range
In 3.0eV~5.0eV.In order to avoid the exciton after compound is spread to both sides functional layer, the triplet T1 energy level ratio of main body is shared
At least big 0.2eV of the triplet T1 energy level of red dopant or green-doped object.
In conclusion Organic Light Emitting Diode provided in this embodiment, which shares main body by red green dopant, realizes that energy turns
It moves, is easy to adjust the luminous ratio of red green unit, so that the light intensity ratio of the two is stablized, thus compound later with blue light unit
It is photochromic more stable, reach preferable display effect.Exciton recombination rate can be improved, avoid it is compound after function from exciton to both sides
Layer diffusion, and then reduce and be quenched caused by exciton movement, improve luminous efficiency.The integral thickness of device can not only be thinned, also
It can be reduced the number of organic line source, simplify evaporation process, reduce the process costs of processing and reduce the vapor deposition waiting time.
Fig. 4 shows a kind of structural schematic diagram of the Organic Light Emitting Diode provided in another embodiment of the disclosure, this is organic
Light emitting diode can be WOLED.
As shown in figure 4, the WOLED include: substrate 401, the first electrode being disposed on the substrate 402, second electrode 410 with
And the luminescent layer between first electrode 402 and second electrode 410, wherein luminescent layer includes: that the first blue light unit 405, second is blue
Light unit 413, yellow light unit 407, the first articulamentum 406 and the second articulamentum 412, the first blue light unit 405 and yellow light list
Member 407 is connected by the first articulamentum 406, and the second blue light unit 413 is connected with yellow light unit 407 by the second articulamentum 412.
As shown in figure 4, the first blue light unit 405 is close to first electrode 402, the second blue light unit 413 close to second electrode 410, wherein
Yellow light unit has the structure in a shared main body doped with red dopant (Dopant) and green-doped object.Finally, Fig. 4 institute
The Organic Light Emitting Diode shown since substrate 401 successively are as follows: first electrode 402, hole injection layer 403, hole transmission layer
404, the first blue light unit 405, the first articulamentum 406, yellow light unit 407, the second articulamentum 412, the second blue light unit 413,
Electron transfer layer 408, electron injecting layer 409 and second electrode 410.
The structure of yellow light unit in the present embodiment no longer repeats one by one herein referring to the introduction of above-described embodiment.
Display panel in the present embodiment can be realized technical effect identical with above-mentioned Organic Light Emitting Diode, herein not
It repeats one by one again.In addition, luminescent layer in the present embodiment constitutes three cellular constructions of B+Y+B, due to blue light unit intensity and
Service life is the principal element for limiting WOLED+CF and showing, while increasing a blue light unit, it is possible to reduce different angle
Colour cast, increase the service life of display device, while power consumption can also be reduced.
It can be with since yellow light unit is to share body-dopant for the Organic Light Emitting Diode that above-mentioned two embodiment provides
It is completed in a patterning processes, technique can be simplified by adulterating respectively compared to red dopant and green-doped object, reduce technique
Cost, moreover it is possible to reduce the vapor deposition waiting time.
It should be noted that patterning processes herein, can refer to include photoetching process, or, including photoetching process and quarter
Step is lost, while can also include other techniques for being used to form predetermined pattern such as printing, ink-jet, nano impression；Photoetching process,
Refer to the technique for forming figure using photoresist, mask plate, exposure machine etc. including technical process such as film forming, exposure, developments.?
It can be according to the corresponding patterning processes of the structure choice formed in the disclosure during actual processing.
The disclosure also provides a kind of display panel, which includes the Organic Light Emitting Diode in above-described embodiment.
Display panel in the present embodiment can be realized technical effect identical with above-mentioned Organic Light Emitting Diode, herein not
It repeats one by one again.
The disclosure additionally provides a kind of display device, which includes the organic light-emitting diodes in above-described embodiment
Pipe.It should be noted that the display device can be with are as follows: display panel, Electronic Paper, mobile phone, tablet computer, television set, display,
Any products or components having a display function such as laptop, Digital Frame, navigator.
It will be clearly understood that the present disclosure describes how to form and use particular example, but the principle of the disclosure is not limited to
These exemplary any details.On the contrary, the introduction based on disclosure disclosure, these principles can be applied to many other
Embodiment.
It is particularly shown and described the illustrative embodiments of the disclosure above.It should be appreciated that the disclosure is unlimited
In detailed construction described herein, set-up mode or implementation method；On the contrary, disclosure intention covers included in appended claims
Spirit and scope in various modifications and equivalence setting.
Claims (10)
1. a kind of Organic Light Emitting Diode, comprising: substrate, first electrode, second electrode and the institute of setting on the substrate
State the luminescent layer between first electrode and the second electrode, which is characterized in that the luminescent layer includes:
First blue light unit, yellow light unit and the first articulamentum, the first blue light unit and the yellow light unit pass through institute
State the series connection of the first articulamentum；
Wherein the yellow light unit has the structure in a shared main body doped with red dopant and green-doped object, and described
Red dopant is opposite with the trend that doping ratio of the green-doped object in the shared main body changes in the same direction.
2. Organic Light Emitting Diode according to claim 1, which is characterized in that include the first main body in the shared main body
With the second main body, doped with the red dopant and the green-doped in first main body and second main body
Object, and doping ratio is different.
3. Organic Light Emitting Diode according to claim 1, which is characterized in that the red dopant is mixed with the green
Doping way of the sundries in the shared main body is grade doping.
4. Organic Light Emitting Diode according to claim 2, which is characterized in that the red dopant is mixed with the green
Trend that doping ratio of the sundries in first main body changes in the same direction on the contrary, the red dopant with it is described green
The trend that doping ratio of the color dopant in second main body changes in the same direction is also opposite.
5. Organic Light Emitting Diode according to claim 2, which is characterized in that first main body accounts for the shared main body
Ratio be less than second main body and account for the ratio of the shared main body, it is described wherein first main body is biased to transporting holes
Second main body is biased to transmission electronics.
6. Organic Light Emitting Diode according to claim 2, which is characterized in that first main body has electronic barrier layer
Function, the second main body have hole barrier layer function.
7. Organic Light Emitting Diode according to claim 1, which is characterized in that the triplet T1 energy level of the shared main body
Triplet T1 energy level than the red dopant or the green-doped object is 0.2eV at least big.
8. Organic Light Emitting Diode according to claim 1, which is characterized in that the triplet T1 energy level of the shared main body
Range is 2.5eV~6.0eV.
9. Organic Light Emitting Diode according to claim 1, which is characterized in that the luminescent layer further include: the second blue light
Unit and the second articulamentum, the second blue light unit are connected with the yellow light unit by second articulamentum, wherein institute
The first blue light unit is stated close to the first electrode, the second blue light unit is close to the second electrode.
10. a kind of display panel, which is characterized in that including Organic Light Emitting Diode according to any one of claims 1 to 9.
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| CN108682750A (en) * | 2018-06-13 | 2018-10-19 | 江苏集萃有机光电技术研究所有限公司 | Organic Light Emitting Diode and preparation method thereof |
| CN109545993B (en) * | 2018-11-19 | 2020-12-29 | 京东方科技集团股份有限公司 | Organic light emitting device, method of manufacturing the same, and lighting apparatus |
| KR20200058838A (en) * | 2018-11-20 | 2020-05-28 | 엘지디스플레이 주식회사 | Organic Light Emitting Diode Display Device |
| CN111755614A (en) * | 2020-06-17 | 2020-10-09 | 武汉华星光电半导体显示技术有限公司 | Organic light emitting diode display device and display panel |
| CN112186114B (en) * | 2020-09-30 | 2023-09-01 | 北京夏禾科技有限公司 | Organic electroluminescent device |
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