CN113745423A - Display panel and preparation method thereof - Google Patents
Display panel and preparation method thereof Download PDFInfo
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- CN113745423A CN113745423A CN202110948271.XA CN202110948271A CN113745423A CN 113745423 A CN113745423 A CN 113745423A CN 202110948271 A CN202110948271 A CN 202110948271A CN 113745423 A CN113745423 A CN 113745423A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
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Abstract
The invention discloses a display panel and a preparation method thereof. The display panel comprises a first electrode layer, a hole transport layer, a light emitting layer and a second electrode layer; the hole transport layer is arranged on the first electrode layer and comprises a first hole transport part and a second hole transport part; the light-emitting layer is arranged on the hole transport layer and comprises a first composite light-emitting part arranged on the first hole transport part and a second light-emitting part arranged on the second hole transport part, and the first composite light-emitting part comprises at least two first light-emitting parts and a first charge generation part positioned between every two adjacent first light-emitting parts; the second electrode layer is arranged on the light-emitting layer; wherein the first composite light emitting section has an emission color different from that of the second light emitting section, and the first hole transporting section has a hole mobility different from that of the second hole transporting section. The invention can improve the luminous efficiency and the service life of the display panel and the luminous uniformity among different pixels.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a preparation method thereof.
Background
An Organic Light Emitting diode Display (OLED) has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, a viewing angle of nearly 180 °, a wide temperature range, flexible Display, large-area full color Display, and the like, and is considered as a Display device with the most potential for development. OLEDs can be classified into two broad categories, namely, direct addressing and thin film transistor Matrix addressing, namely, Passive Matrix OLEDs (PMOLEDs) and Active Matrix OLEDs (AMOLEDs) according to driving methods. The AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a large-sized display device with high definition.
At present, the OLED itself has certain disadvantages, mainly in terms of lifetime characteristics. The single-layer RGB light-emitting layer is difficult to meet the requirement of long-term use, the device structure of the double-laminated RGB light-emitting layer is relatively complex, the thickness of the device is increased, the process difficulty is high, the yield is reduced, and the service life of the device cannot be guaranteed.
Disclosure of Invention
The embodiment of the invention provides a display panel and a preparation method thereof, which can solve the technical problem that an OLED light-emitting device in the prior art is difficult to meet long-term use due to low service life.
The embodiment of the invention provides a display panel, which comprises a first sub-pixel area and a second sub-pixel area;
the display panel further includes:
a first electrode layer;
the hole transport layer is arranged on the first electrode layer and comprises a first hole transport part positioned in the first sub-pixel area and a second hole transport part positioned in the second sub-pixel area;
the light-emitting layer is arranged on the hole transport layer and comprises a first composite light-emitting part arranged on the first hole transport part and a second light-emitting part arranged on the second hole transport part, and the first composite light-emitting part comprises at least two first light-emitting parts and a first charge generation part positioned between every two adjacent first light-emitting parts; and
a second electrode layer disposed on the light emitting layer;
wherein an emission color of the first composite light emitting section is different from an emission color of the second light emitting section, and a hole mobility of the first hole transporting section is different from a hole mobility of the second hole transporting section.
In one embodiment of the present invention, the HOMO level of the material of the first hole transporting region is in a range of-5.1 eV to-5.8 eV, the HOMO level of the material of the second hole transporting region is in a range of-5.5 eV to-6.5 eV, and the HOMO level of the material of the first hole transporting region is different from the HOMO level of the material of the second hole transporting region.
In one embodiment of the present invention, an absolute value of a difference between the HOMO level of the material of the first hole transporting region and the HOMO level of the material of the second hole transporting region is less than 0.3 eV.
In an embodiment of the invention, the display panel further includes a third sub-pixel region, the hole transport layer further includes a third hole transport portion disposed on the first electrode layer and located in the third sub-pixel region, the light emitting layer further includes a third light emitting portion disposed on the third hole transport portion, and an emission color of the third light emitting portion, an emission color of the second light emitting portion, and an emission color of the first composite light emitting portion are different, and a hole mobility of the third hole transport portion is different from a hole mobility of the first hole transport portion.
In an embodiment of the present invention, the third hole transporting portion is integrally formed with the second hole transporting portion.
In an embodiment of the invention, the display panel further includes a fourth sub-pixel region, the hole transport layer further includes a fourth hole transport portion disposed on the first electrode layer and located in the fourth sub-pixel region, the light emitting layer further includes a fourth composite light emitting portion disposed on the fourth hole transport portion, and the fourth composite light emitting portion includes at least two fourth light emitting sub-portions and a fourth charge generating portion located between two adjacent fourth light emitting sub-portions.
In one embodiment of the present invention, the emission color of the fourth composite light-emitting portion, the emission color of the second light-emitting portion, and the emission color of the first composite light-emitting portion are different, and the hole mobility of the fourth hole-transporting portion is different from the hole mobility of the second hole-transporting portion.
In one embodiment of the present invention, the fourth hole transporting portion has the same hole mobility as the first hole transporting portion.
In one embodiment of the present invention, an absolute value of a difference between a HOMO level of a material of the first hole transporting portion and a HOMO level of a material of the second hole transporting portion is less than 0.15eV, and/or an absolute value of a difference between a HOMO level of a material of the fourth hole transporting portion and a HOMO level of a material of the second hole transporting portion is less than 0.15 eV.
According to the above object of the present invention, there is provided a method for manufacturing a display panel, the display panel including a first sub-pixel region and a second sub-pixel region, the method comprising:
forming a first electrode layer;
forming a hole transport layer on the first electrode layer, wherein the hole transport layer comprises a first hole transport part formed in the first sub-pixel region and a second hole transport part formed in the second sub-pixel region, and the hole mobility of the first hole transport part is different from that of the second hole transport part;
forming a light-emitting layer on the hole transport layer, wherein the light-emitting layer includes a first composite light-emitting portion formed on the first hole transport portion and a second light-emitting portion formed on the second hole transport portion, and the light-emitting color of the first composite light-emitting portion is different from the light-emitting color of the second light-emitting portion, and the first composite light-emitting portion includes at least two first light-emitting portions and a first charge-generating portion located between two adjacent first light-emitting portions; and
and forming a second electrode layer on the light-emitting layer.
The invention has the beneficial effects that: the invention improves the current transmission efficiency and the service life of the first composite light-emitting part by arranging the laminated light-emitting sub-layer and charge generation layer in the first sub-pixel area, and has simple structure and can achieve the effect of simplifying the process, meanwhile, the invention arranges the laminated second hole-transmitting part and second light-emitting part in the second sub-pixel area, and the hole mobility of the second hole-transmitting part is different from that of the first hole-transmitting part, because the first composite light-emitting part has a plurality of light-emitting sub-layers, the film layer structures and the compositions of the first composite light-emitting part and the second light-emitting part are different, the hole transmission rates in the first composite light-emitting part and the second light-emitting part are different, therefore, the first hole transport part and the second hole transport part with different hole mobilities are arranged for the first composite light emitting part and the second light emitting part, so that the hole mobilities in the first hole transport part and the first composite light emitting part and the hole mobilities in the second hole transport part and the second light emitting part tend to be consistent, the light emitting effect of the device is improved, and the display effect of the display panel is improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural view of a conventional light emitting device;
fig. 2 is a schematic structural view of a conventional light emitting device;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating an energy level of a light emitting layer of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 9 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1 and 2, which are schematic structural diagrams of two conventional light emitting devices, the light emitting device shown in fig. 1 includes an anode 101 and a cathode 105 disposed opposite to each other, and a hole transport layer 102, an organic light emitting layer 103 and an electron transport layer 104 disposed between the anode 101 and the cathode 105, wherein the organic light emitting layer 103 has a single-layer structure, which results in limited light emitting efficiency and service life, and is difficult to meet the rapid development of a display device.
The light emitting device shown in fig. 2 includes an anode 201 and a cathode 209 disposed opposite to each other, and a lower hole transport layer 202, a lower organic light emitting layer 203, a lower electron transport layer 204, a charge generation layer 205, an upper hole transport layer 206, an upper organic light emitting layer 207, and an upper electron transport layer 208 disposed between the anode 201 and the cathode 209, wherein the light emitting device adopts a multi-layer structure of a double-layer organic light emitting layer, a double-layer hole transport layer, and a double-layer electron transport layer to improve light emitting efficiency and prolong service life.
Referring to fig. 3, an embodiment of the invention provides a display panel including a first sub-pixel area a and a second sub-pixel area B.
The display panel further includes a first electrode layer 11, a second electrode layer 12, a hole transport layer 20, and a light emitting layer 30.
The hole transport layer 20 is disposed on the first electrode layer 11, and the hole transport layer 20 includes a first hole transport portion 21 located in the first sub-pixel region a and a second hole transport portion 22 located in the second sub-pixel region B; the light-emitting layer 30 is disposed on the hole transport layer 20, and the light-emitting layer 30 includes a first combined light-emitting portion 31 disposed on the first hole transport portion 21 and a second light-emitting portion 32 disposed on the second hole transport portion 22, the first combined light-emitting portion 31 includes at least two first light-emitting sub-portions 311 and a first charge generation portion 312 between two adjacent first light-emitting sub-portions 311; the second electrode layer 12 is disposed on the light-emitting layer 30.
Further, the emission color of the first composite light-emitting portion 31 is different from the emission color of the second light-emitting portion 32, and the hole mobility of the first hole transporting portion 21 is different from the hole mobility of the second hole transporting portion 22.
In the implementation, in the embodiment of the present invention, by disposing the first hole transporting portion 21 and the first composite light emitting portion 31 in the first sub-pixel region a in a stacked manner, and the first composite light emitting portion 31 includes at least two first light emitting sub-portions 311 and the first charge generating portion 312 located between two adjacent first light emitting sub-portions 311, the current transporting efficiency and the lifetime of the first composite light emitting portion 31 are improved by disposing the stacked light emitting sub-layers and charge generating layers, and the structure is simple, and the effect of simplifying the process can be achieved, meanwhile, the present invention disposes the second hole transporting portion 22 and the second light emitting portion 32 in the second sub-pixel region B in a stacked manner, and the hole mobility of the second hole transporting portion 22 is different from the hole mobility of the first hole transporting portion 21, and the film layer structures and compositions of the first composite light emitting portion 31 and the second light emitting portion 32 are different due to the first composite light emitting portion 31 having multiple light emitting sub-layers, the hole transport rates in the first light-emitting composite part 31 and the second light-emitting composite part 32 are different, so that the first hole transport part 21 and the second hole transport part 22 with different hole mobilities are arranged for the first light-emitting composite part 31 and the second light-emitting composite part 32, and further the hole mobilities in the first hole transport part 21 and the first light-emitting composite part 31 and the hole mobilities in the second hole transport part 22 and the second light-emitting composite part 32 tend to be consistent, so that the light-emitting effect of the device is improved, and the display effect of the display panel is improved.
In the embodiment of the present invention, the HOMO level of the material of the first hole transporting portion 21 is different from the HOMO level of the material of the second hole transporting portion 22. Further, the HOMO level range of the material of the first hole transport region 21 is-5.1 eV to-5.8 eV, and the HOMO level range of the material of the second hole transport region 22 is-5.5 eV to-6.5 eV, and since the first composite light emitting region 31 has a multi-layer composite structure, and the structure is different from that of the second light emitting region 32, the hole transport rate is also different, therefore, in the embodiment of the present invention, the first hole transport region 21 is prepared by using a material with a shallower HOMO level, and the second hole transport region 22 is prepared by using a material with a deeper HOMO level, so that the hole mobility in the first hole transport region 21 and the first composite light emitting region 31 and the hole mobility in the second hole transport region 22 and the second light emitting region 32 tend to be the same, so as to improve the light emitting effect of the device and improve the display effect of the display panel. And the absolute value of the difference between the HOMO level of the material of the first hole transport part 21 and the HOMO level of the material of the second hole transport part 22 is less than 0.3eV, so that the light emitting uniformity and the light emitting efficiency of the first sub-pixel region a and the second sub-pixel region B can be improved.
Further, in the embodiment of the present invention, the first hole transporting region 21 is prepared by using materials with different HOMO energy levels for the first composite light emitting region 31 with different film layer structures, and the energy level matching is as shown in fig. 4, and it can be seen that the embodiment of the present invention can improve the light emitting efficiency of the first composite light emitting region 31 and the light emitting uniformity between the first composite light emitting region 31 and the second light emitting region 32.
Referring to fig. 3, in an embodiment of the invention, the display panel includes a substrate 70, a thin film transistor array layer 40 disposed on the substrate 70, a first electrode layer 11 disposed on the thin film transistor array layer 40, a hole transport layer 20 disposed on the first electrode layer 11, a light emitting layer 30 disposed on the hole transport layer 20, a hole blocking layer 51 disposed on the light emitting layer 30, an electron transport layer 52 disposed on the hole blocking layer 51, a second electrode 12 disposed on the electron transport layer 52, and a light extraction layer 60 disposed on the second electrode 12. The first electrode layer 11 may be an anode layer, and the second electrode layer 12 may be a cathode layer, so as to provide electrons and holes to the light-emitting layer 30, so as to realize light emission of the light-emitting layer 30.
Specifically, referring to fig. 3 and fig. 5, the thin film transistor array layer 40 includes a buffer layer 41, a passivation layer 42, a first insulating layer 43, a first gate insulating layer 44, a second gate insulating layer 45, an interlayer insulating layer 46, and a thin film transistor device 47 covering between the insulating layers, which are disposed on a substrate 70, and the structure of the thin film transistor array layer 40 can be implemented by referring to a conventional process, and is not repeated herein. The display panel further includes a pixel defining layer 80, and the pixel defining layer 80 defines a plurality of sub-pixel regions, wherein the sub-pixel regions at least include a first sub-pixel region a, a second sub-pixel region B, and a third sub-pixel region C, and the light emitting colors of the three sub-pixel regions are different. The first electrode layer 11 is disposed on the interlayer insulating layer 46 and corresponds to each sub-pixel region. The display panel further includes a light-emitting functional layer 90 corresponding to each sub-pixel region and disposed on the first electrode layer 11, and a second electrode layer 12 disposed on the light-emitting functional layer 90, in the embodiment of the present invention, the light-emitting functional layer 90 includes a hole transport layer 20, a light-emitting layer 30, a hole blocking layer 51, and an electron transport layer 52.
Referring to fig. 3, the hole transport layer 20 includes a first hole transport portion 21 disposed in the first sub-pixel region a, a second hole transport portion 22 disposed in the second sub-pixel region B, and a third hole transport portion 23 disposed in the third sub-pixel region C; the light-emitting layer 30 includes a first combined light-emitting portion 31 provided on the first hole transporting portion 21, a second light-emitting portion 32 provided on the second hole transporting portion 22, and a third light-emitting portion 33 provided on the third hole transporting portion 23.
It is understood that, in the present embodiment, the first composite light emitting part 31 is a multi-layer composite film including the first light emitting sub-part 311, the first charge generating part 312 and the first light emitting sub-part 311, and the second light emitting part 32 and the third light emitting part 33 are all single-layer organic light emitting films, but the light emitting colors of the first composite light emitting part 31, the second light emitting part 32 and the third light emitting part 33 are different.
Optionally, since the second light emitting part 32 and the third light emitting part 33 are both single-layer organic light emitting films, the second hole transporting part 22 and the third hole transporting part 23 are integrally formed, so as to reduce the process steps and save the process cost.
Further, since the film structures of the first combined light emitting portion 31, the second light emitting portion 32 and the third light emitting portion 33 are different, in the present embodiment, the hole mobility of the first hole transporting portion 21 is different from the hole mobility of the second hole transporting portion 22 and the third hole transporting portion 23, that is, the first hole transporting portion 21 is made of a material with a shallow HOMO energy level, and the second hole transporting portion 22 and the third hole transporting portion 23 are made of a material with a deep HOMO energy level, so that the hole mobility of the first hole transporting portion 21 and the first combined light emitting portion 31, the hole mobility of the second hole transporting portion 22 and the second light emitting portion 32, and the hole mobility of the third hole transporting portion 23 and the third light emitting portion 33 tend to be the same, thereby improving the light emitting efficiency of the display panel and the display effect of the display panel.
Also in the present embodiment, since the second hole transporting layer 22 and the third hole transporting layer 23 are formed integrally, the absolute value of the difference between the HOMO level of the material of the first hole transporting layer 21 and the HOMO level of the material of the second hole transporting layer 22 is less than 0.15 eV.
Referring to fig. 6, in another embodiment of the present invention, the display panel includes a first sub-pixel area a, a second sub-pixel area B and a fourth sub-pixel area D, wherein the hole transport layer 20 includes a first hole transport portion 21 disposed in the first sub-pixel area a, a second hole transport portion 22 disposed in the second sub-pixel area B and a fourth hole transport portion 24 disposed in the fourth sub-pixel area D; the light-emitting layer 30 includes a first recombination light-emitting portion 31 provided on the first hole transporting portion 21, a second light-emitting portion 32 provided on the second hole transporting portion 22, and a fourth recombination light-emitting portion 34 provided on the fourth hole transporting portion 24. And the light emission colors of the first composite light emitting portion 31, the second light emitting portion 32, and the fourth composite light emitting portion 34 are all different.
Further, the first composite light emitting portion 31 includes a first light emitting sub-portion 311, a first charge generating portion 312, and a first light emitting sub-portion 311, which are stacked, and the fourth composite light emitting portion 34 includes a fourth light emitting sub-portion 341, a fourth charge generating portion 342, and a fourth light emitting sub-portion 341, which are stacked. Since the first and fourth composite light emitting parts 31 and 34 are both composite light emitting film layer structures, in the present embodiment, the hole mobility of the fourth hole transporting part 24 is different from the hole mobility of the second hole transporting part 22, and the hole mobility of the fourth hole transporting part 24 is the same as the hole mobility of the first hole transporting part 21.
Alternatively, in the present embodiment, the first hole transporting layer 21 and the fourth hole transporting layer 24 are integrally formed, and in the present embodiment, the absolute value of the difference between the HOMO level of the material of the first hole transporting layer 21 and the HOMO level of the material of the second hole transporting layer 22 is less than 0.15 eV.
Referring to fig. 7, in another embodiment of the present invention, the difference between the present invention and the previous embodiment is that the hole transport layer 20 includes a first hole transport portion 21 disposed in the first sub-pixel region a, a second hole transport portion 22 disposed in the second sub-pixel region B, and a fourth hole transport portion 24 disposed in the fourth sub-pixel region D, and the fourth hole transport portion 24 and the first hole transport portion 21 are made of different materials.
In the present embodiment, the difference between the HOMO level of the material of the second hole transporting layer 22 and the HOMO level of the material of the fourth hole transporting layer 24 is 0.15eV, and the difference between the HOMO level of the material of the fourth hole transporting layer 24 and the HOMO level of the material of the first hole transporting layer 21 is 0.15eV, that is, as shown in fig. 5, the HOMO levels of the material of the second hole transporting layer 22, the HOMO level of the material of the fourth hole transporting layer 24 and the HOMO level of the material of the first hole transporting layer 21 are sequentially increased or decreased, and in the application, the trapezoidal arrangement in which the HOMO levels are increased or decreased further improves the light emitting efficiency and light emitting uniformity of the display panel.
Referring to fig. 8, the difference from the previous embodiment is that the positions of the second sub-pixel region B and the fourth sub-pixel region D are exchanged, in this embodiment, the difference between the HOMO level of the material of the fourth hole transport part 24 and the HOMO level of the material of the second hole transport part 22 is 0.15eV, the difference between the HOMO level of the material of the second hole transport part 22 and the HOMO level of the material of the first hole transport part 21 is 0.15eV, and the HOMO level of the material of the fourth hole transport part 24, the HOMO level of the material of the second hole transport part 22 and the HOMO level of the material of the first hole transport part 21 sequentially increase or decrease, and in the application, the trapezoidal arrangement in which the HOMO levels increase or decrease further improves the light emitting efficiency and the light emitting uniformity of the display panel.
In the embodiment of the present invention, the light emitting colors of the first composite light emitting portion 31, the second light emitting portion 32, and the third light emitting portion 33 may be selected from one of red, green, and blue, and may be different from each other, or the light emitting colors of the first composite light emitting portion 31, the second light emitting portion 32, and the fourth composite light emitting portion 34 may be selected from one of red, green, and blue, and may be different from each other. And when the light emitting color of the first composite light emitting portion 31 or the fourth composite light emitting portion 34 is blue, the problem of low light emitting efficiency and short service life of blue light can be further solved.
In addition, referring to fig. 3 and fig. 9, a method for manufacturing a display panel according to the above embodiment is provided, wherein the display panel includes a first sub-pixel area a and a second sub-pixel area B, and the method for manufacturing the display panel includes the following steps:
and S10, forming the first electrode layer 11.
Providing a substrate 70, and sequentially preparing a thin film transistor array layer 40 and a first electrode layer 11 on the substrate 70, wherein optionally, the material of the first electrode layer 11 is at least one of ITO, AZO, TZO, a nano Ag wire thin film, graphene, and the like.
S20, forming a hole transport layer 20 on the first electrode layer 11, wherein the hole transport layer 20 includes a first hole transport portion 21 formed in the first sub-pixel region a and a second hole transport portion B formed in the second sub-pixel region B, and the hole mobility of the first hole transport portion 21 is different from the hole mobility of the second hole transport portion 22.
In the embodiment of the present invention, the display panel further includes a third sub-pixel region C.
First, a first hole transporting portion 21 is formed on the first electrode layer 11 corresponding to the first sub-pixel region a, and the first hole transporting portion 21 is made of a material having a HOMO level of-5.1 eV to-5.8 eV, and the thickness of the first hole transporting portion 21 is 90nm to 130 nm.
Next, a second hole transporting portion 22 (or a third hole transporting portion 23, i.e., the second hole transporting portion 22 and the third hole transporting portion 23 can be integrally formed) is formed on the first electrode layer 11 corresponding to the second sub-pixel region B and the third sub-pixel region C, wherein the second hole transporting portion 22 is made of a material having a HOMO level in a range of-5.5 eV to-6.5 eV, and the thickness of the second hole transporting portion 22 is 80 nm to 120 nm.
Note that the HOMO level of the material of the first hole transporting portion 21 is different from the HOMO level of the material of the second hole transporting portion 22.
S30, forming a light emitting layer 30 on the hole transporting layer 20, wherein the light emitting layer 30 includes a first composite light emitting portion 31 formed on the first hole transporting portion 21 and a second light emitting portion 32 formed on the second hole transporting portion 22, and the light emitting color of the first composite light emitting portion 31 is different from the light emitting color of the second light emitting portion 32, and the first composite light emitting portion 31 includes at least two first light emitting sub-portions 311 and a first charge generating portion 312 located between two adjacent first light emitting sub-portions 311.
Alternatively, in the embodiment of the present invention, the light emission color of the first composite light emitting part 31 is blue, and the light emission color of the second light emitting part 32 is red.
First light-emitting sub-section 311, first charge generation section 312 and first light-emitting sub-section 311 are formed on first hole transport section 21 in sequence, wherein the same electron accepting material and electron transporting material may be used in the two first light-emitting sub-sections 311, or different electron accepting materials and electron transporting materials may be used in the two first light-emitting sub-sections 311, which is not limited herein. The material of the first light emitting sub-section 311 may be at least one of an organic thermal activation delayed luminescence material, a fluorescent material, and a super fluorescent material, and the material of the first charge generation section 312 is not limited to a p-type organic semiconductor material and an n-type organic semiconductor material.
Wherein the thickness of the first light emitting sub-portion 311 is 15 to 30nm, and the thickness of the first charge generation portion is 25 to 50 nm.
Specifically, the structural general formula of the material of the first light emitting moiety 311 is as follows:
wherein R1 to R6 are each independently selected from any one of a hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, a nitro group, a group containing a carbonyl group having 20 or less carbon atoms, a group containing a carbonyl ester group, an alkyl group, an alkenyl group, an alkoxy group, a group containing a silyl group having 30 or less carbon atoms, a group containing an aryl group, a group containing a heterocyclic group, and a group containing an amino group.
Optionally, the structural formula of the material of the first light-emitting sub-portion 311 includes any one of the following:
next, a second light emitting section 32 is provided on the second hole transporting section 22 corresponding to the second sub-pixel region B, and a third light emitting section 33 is provided corresponding to the third sub-pixel region C.
Alternatively, in the embodiment of the present invention, the light emission color of the third light emitting part 33 is green, and the material of the second light emitting part 32 and the material of the third light emitting part 33 include Single Host-dot phosphorescent type material or Pre-mix Host-dot material, wherein the thickness of the second light emitting part 32 is 100 to 130nm, and the thickness of the third light emitting part 33 is 60 to 100 nm.
S40, the second electrode layer 12 is formed on the light-emitting layer 30.
A hole blocking layer 51, an electron transport layer 52 and a second electrode layer 12 are sequentially prepared on the light emitting layer 30, wherein the material of the hole blocking layer 51 includes a material having functions of blocking holes and transporting electrons, such as ZnO nanoparticles, the material of the electron transport layer 52 includes a mixed material of a Li compound and a resin material, and the material of the second electrode layer 12 includes an alloy material of one or more of Mg, Ag, Al and Ca. Optionally, in the embodiment of the present invention, the second electrode layer 12 is prepared by using a magnesium-silver alloy, and a mass ratio of magnesium to silver is 1:9 to 9: 1.
Further, the thickness of the hole blocking layer 51 is 5 to 15nm, the thickness of the electron transport layer 52 is 25 to 35nm, and the thickness of the second electrode layer 12 is 10 to 100 nm.
Then, a light extraction layer 60 is formed on the second electrode layer 12, and the material of the light extraction layer 60 may be a material having a high refractive index, which is not limited herein, and the thickness of the light extraction layer 60 is 50 to 90 nm.
In the embodiment of the invention, the first electrode layer 11 may be an anode layer, and the second electrode layer 12 may be a cathode layer, so as to provide electrons and holes for the light emitting layer 30 to achieve light emission of the light emitting layer 30.
In addition, an embodiment of the present invention further provides a display device, where the display device includes the display panel and the device main body described in the above embodiment, and the display panel and the device main body are combined into a whole.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display panel and the manufacturing method thereof provided by the embodiment of the invention are described in detail above, and the principle and the embodiment of the invention are explained by applying specific examples, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display panel is characterized by comprising a first sub-pixel area and a second sub-pixel area;
the display panel further includes:
a first electrode layer;
the hole transport layer is arranged on the first electrode layer and comprises a first hole transport part positioned in the first sub-pixel area and a second hole transport part positioned in the second sub-pixel area;
the light-emitting layer is arranged on the hole transport layer and comprises a first composite light-emitting part arranged on the first hole transport part and a second light-emitting part arranged on the second hole transport part, and the first composite light-emitting part comprises at least two first light-emitting parts and a first charge generation part positioned between every two adjacent first light-emitting parts; and
a second electrode layer disposed on the light emitting layer;
wherein an emission color of the first composite light emitting section is different from an emission color of the second light emitting section, and a hole mobility of the first hole transporting section is different from a hole mobility of the second hole transporting section.
2. The display panel according to claim 1, wherein the HOMO level of the material of the first hole transporting portion is in a range of-5.1 eV to-5.8 eV, the HOMO level of the material of the second hole transporting portion is in a range of-5.5 eV to-6.5 eV, and the HOMO level of the material of the first hole transporting portion is different from the HOMO level of the material of the second hole transporting portion.
3. The display panel according to claim 2, wherein an absolute value of a difference between a HOMO level of a material of the first hole transporting region and a HOMO level of a material of the second hole transporting region is less than 0.3 eV.
4. The display panel according to claim 1, wherein the display panel further comprises a third sub-pixel region, the hole transport layer further comprises a third hole transport portion disposed on the first electrode layer and in the third sub-pixel region, the light emitting layer further comprises a third light emitting portion disposed on the third hole transport portion, and the light emitting color of the third light emitting portion, the light emitting color of the second light emitting portion, and the light emitting color of the first composite light emitting portion are different, and the hole mobility of the third hole transport portion is different from the hole mobility of the first hole transport portion.
5. The display panel according to claim 4, wherein the third hole transporting portion is formed integrally with the second hole transporting portion.
6. The display panel according to claim 1, wherein the display panel further comprises a fourth sub-pixel region, the hole transport layer further comprises a fourth hole transport portion disposed on the first electrode layer and located in the fourth sub-pixel region, the light emitting layer further comprises a fourth composite light emitting portion disposed on the fourth hole transport portion, and the fourth composite light emitting portion comprises at least two fourth light emitting subsections and a fourth charge generating portion located between two adjacent fourth light emitting subsections.
7. The display panel according to claim 6, wherein an emission color of the fourth composite light-emitting portion, an emission color of the second light-emitting portion, and an emission color of the first composite light-emitting portion are different, and wherein a hole mobility of the fourth hole-transporting portion is different from a hole mobility of the second hole-transporting portion.
8. The display panel according to claim 6, wherein the fourth hole transport portion has the same hole mobility as the first hole transport portion.
9. A display panel as claimed in claim 6 characterized in that the absolute value of the difference between the HOMO level of the material of the first hole transport region and the HOMO level of the material of the second hole transport region is less than 0.15eV and/or the absolute value of the difference between the HOMO level of the material of the fourth hole transport region and the HOMO level of the material of the second hole transport region is less than 0.15 eV.
10. A method for manufacturing a display panel, the display panel including a first sub-pixel region and a second sub-pixel region, the method comprising:
forming a first electrode layer;
forming a hole transport layer on the first electrode layer, wherein the hole transport layer comprises a first hole transport part formed in the first sub-pixel region and a second hole transport part formed in the second sub-pixel region, and the hole mobility of the first hole transport part is different from that of the second hole transport part;
forming a light-emitting layer on the hole transport layer, wherein the light-emitting layer includes a first composite light-emitting portion formed on the first hole transport portion and a second light-emitting portion formed on the second hole transport portion, and the light-emitting color of the first composite light-emitting portion is different from the light-emitting color of the second light-emitting portion, and the first composite light-emitting portion includes at least two first light-emitting portions and a first charge-generating portion located between two adjacent first light-emitting portions; and
and forming a second electrode layer on the light-emitting layer.
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| CN104576950A (en) * | 2013-10-23 | 2015-04-29 | 乐金显示有限公司 | Organic light emitting device |
| CN106409877A (en) * | 2016-11-21 | 2017-02-15 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel and organic light emitting display device |
| CN106816537A (en) * | 2015-11-30 | 2017-06-09 | 乐金显示有限公司 | Organic light-emitting display device and forming method thereof |
| US20180166509A1 (en) * | 2017-07-28 | 2018-06-14 | Shanghai Tianma AM-OLED Co., Ltd. | Organic light-emitting diode, display panel and display device |
| CN111370585A (en) * | 2018-12-26 | 2020-07-03 | 广东聚华印刷显示技术有限公司 | Light emitting device and display apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104576950A (en) * | 2013-10-23 | 2015-04-29 | 乐金显示有限公司 | Organic light emitting device |
| CN106816537A (en) * | 2015-11-30 | 2017-06-09 | 乐金显示有限公司 | Organic light-emitting display device and forming method thereof |
| CN106409877A (en) * | 2016-11-21 | 2017-02-15 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel and organic light emitting display device |
| US20180166509A1 (en) * | 2017-07-28 | 2018-06-14 | Shanghai Tianma AM-OLED Co., Ltd. | Organic light-emitting diode, display panel and display device |
| CN111370585A (en) * | 2018-12-26 | 2020-07-03 | 广东聚华印刷显示技术有限公司 | Light emitting device and display apparatus |
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