CN110635058A - Organic light-emitting device and display panel - Google Patents
Organic light-emitting device and display panel Download PDFInfo
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- CN110635058A CN110635058A CN201910920135.2A CN201910920135A CN110635058A CN 110635058 A CN110635058 A CN 110635058A CN 201910920135 A CN201910920135 A CN 201910920135A CN 110635058 A CN110635058 A CN 110635058A
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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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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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- H—ELECTRICITY
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Abstract
The embodiment of the invention discloses an organic light-emitting device and a display panel. The organic light-emitting device comprises an anode layer, at least one sub-hole transport layer, a light-emitting layer and a cathode layer, wherein the at least one sub-hole transport layer, the light-emitting layer and the cathode layer are sequentially stacked on the anode layer, the at least one sub-hole transport layer comprises at least one doped hole transport layer, and the doped hole transport layer comprises at least two hole transport materials with different hole mobility. The technical scheme of the embodiment of the invention ensures that the hole mobility of the doped hole transport layer meets the requirement of the hole transport speed, so that the organic light-emitting device has higher luminous efficiency, and simultaneously, the large accumulation of holes on the interface of the light-emitting layer close to the anode side can be reduced, and the service life of the organic light-emitting device is prolonged.
Description
Technical Field
The embodiment of the invention relates to the field of display, in particular to an organic light-emitting device and a display panel.
Background
With the development of display technology and the application of organic light emitting devices in mobile phones, vehicles and television displays, people have higher and higher requirements for the performance of organic light emitting devices, however, the service life of the existing organic light emitting devices is short, so that the service life of the organic light emitting devices is prolonged, which is a problem to be solved in the industry.
Disclosure of Invention
Embodiments of the present invention provide an organic light emitting device and a display panel, so as to ensure that the organic light emitting device has higher light emitting efficiency and improve the service life of the organic light emitting device.
In order to realize the technical problem, the invention adopts the following technical scheme:
in a first aspect, embodiments of the present invention provide an organic light emitting device, including: the anode layer, at least one layer of sub-hole transport layer, the light emitting layer and the cathode layer are sequentially stacked on the anode layer;
the at least one sub-hole transport layer comprises at least one doped hole transport layer comprising at least two hole transport materials having different hole mobilities.
Further, the organic light-emitting device comprises at least two sub-hole transport layers, and the hole mobility of the sub-hole transport layers is gradually reduced along the direction from the anode layer to the cathode layer.
Furthermore, one side of each doped hole transport layer, which is adjacent to the anode layer, comprises at least one first sub-hole transport layer, the first sub-hole transport layer comprises at least one first sub-hole transport material, and the first sub-hole transport material is a hole transport material with a larger hole mobility in the doped hole transport layer corresponding to the first sub-hole transport layer;
and/or one side of each doped hole transport layer, which is adjacent to the cathode layer, comprises at least one second sub-hole transport layer, and the second sub-hole transport layer comprises at least one second sub-hole transport material, and the second sub-hole transport material is a hole transport material with lower hole mobility in the doped hole transport layer corresponding to the second sub-hole transport layer.
Further, the HOMO energy level difference between adjacent sub-hole transport layers ranges from 0.01eV to 0.5 eV; the range of HOMO energy level difference between the sub-hole transport layer adjacent to the light-emitting layer and the light-emitting layer is 0.01 eV-0.5 eV; the difference in HOMO energy levels between at least two hole transport materials having different hole mobilities is in the range of 0.01eV to 0.5 eV.
Further, the at least one sub-hole transport layer comprises a first doped hole transport layer comprising a first hole transport material and a second hole transport material, and the hole mobility of the first hole transport material is greater than the hole mobility of the second hole transport material.
Furthermore, the at least one sub-hole transport layer also comprises a second doped hole transport layer, and the second doped hole transport layer is arranged on one side, adjacent to the light-emitting layer, of the first doped hole transport layer;
the second doped hole transport layer comprises a third hole transport material and a fourth hole transport material; the hole transport rate of the second hole transport material is greater than or equal to the hole transport rate of the third hole transport layer; the third hole transport material has a hole mobility greater than the hole mobility of the fourth hole transport material.
Further, the organic light-emitting device further comprises a hole injection layer, wherein the hole injection layer is arranged between the at least one sub-hole transport layer and the anode layer, and the hole injection layer comprises a first hole transport material and a hole injection material.
Furthermore, the doping proportion of the first hole transport material and the second hole transport material of the first doped hole transport layer is 1% -50%;
the doping proportion of the third hole transport material and the fourth hole transport material of the second doped hole transport layer is 1-50%.
Further, the first hole transporting material includes 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ];
the second hole transport material includes N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine; the third hole transport material includes N, N '-diphenyl-N, N' -bis (3-methylphenyl) -1,1 '-biphenyl-4, 4' -diamine; the fourth hole transport material comprises 4,4',4 ″ -tris (carbazol-9-yl) triphenylamine.
In a second aspect, embodiments of the present invention further provide a display panel including the organic light emitting device according to any one of the first aspect.
According to the organic light-emitting device provided by the embodiment of the invention, at least one sub-hole transport layer is arranged to comprise at least one doped hole transport layer, and the doped hole transport layer comprises at least two hole transport materials with different hole mobilities, so that the hole mobility of the doped hole transport layer meets the requirement of the hole transport rate, the organic light-emitting device has higher light-emitting efficiency, and meanwhile, the large accumulation of holes on the interface of the light-emitting layer adjacent to the anode side can be reduced, the increase of non-radiative light emission caused by a large number of holes is reduced, the attenuation of organic materials of the light-emitting layer is slowed down, and the service life of the organic light-emitting device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an organic light emitting device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another organic light emitting device provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another organic light emitting device provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another organic light emitting device provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another organic light emitting device provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another organic light emitting device provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background art, the lifetime of the existing organic light emitting device is low, the inventors have studied to find that the reason for this problem is that: electrons of the organic light-emitting device are injected from the cathode, holes are injected from the anode, and enter the light-emitting layer through the electron transport layer and the hole transport layer respectively, and a large number of holes are transported to the light-emitting layer through the hole transport layer, so that a large number of holes are accumulated on an interface of the light-emitting layer adjacent to one side of the anode layer, non-radiative light emission of organic materials is increased due to the large number of accumulated holes, attenuation of the organic materials in the light-emitting layer is increased, and the service life of the organic light-emitting device is.
In view of the above problems, the present embodiment provides an organic light emitting device. Fig. 1 is a schematic structural diagram of an organic light emitting device according to an embodiment of the present invention. Referring to fig. 1, the organic light emitting device 10 provided in this embodiment includes an anode layer 1, at least one sub-hole transport layer 21, a light emitting layer 3, and a cathode layer 4 sequentially stacked on the anode layer 1, where the at least one sub-hole transport layer 21 includes at least one doped hole transport layer 211, and the doped hole transport layer 211 includes at least two hole transport materials with different hole mobilities.
Specifically, the sub-hole transport layer 21 serves to transport holes to the light emitting layer 3, so that the holes are combined with electrons in the light emitting layer 3, and efficient light emission of the organic light emitting device 10 is achieved. The hole mobility of the sub-hole transport layer 21 is adjusted to adjust the hole mobility, so that the hole transport speed is matched with the electron transport speed, a large amount of accumulation of holes on the side, close to the sub-hole transport layer 21, of the light-emitting layer 3 is reduced, and the service life of the organic light-emitting device 10 is prolonged on the premise that the organic light-emitting device 10 is guaranteed to have high light-emitting efficiency due to the fact that the holes and electrons in the organic light-emitting device 10 are combined more in the light-emitting layer 3. However, a single hole transport material cannot meet the requirements of the organic light emitting device on light emitting efficiency and service life, and the hole transport materials with different hole mobilities are doped, so that the complementation of the properties of the materials can be realized, and the hole mobility of the sub hole transport layer 21 can be well adjusted.
In this embodiment, at least one sub-hole transport layer 21 is arranged to include at least one doped hole transport layer 211, the doped hole transport layer 211 includes at least two hole transport materials with different hole mobilities, the hole mobility of the doped hole transport layer 211 can be adjusted, so that the hole mobility of the doped hole transport layer 211 meets the requirement of the hole transport speed, the organic light emitting device 10 has higher light emitting efficiency, and meanwhile, the interface of the holes on the side of the light emitting layer 3 adjacent to the anode layer 1 can be greatly reduced, thereby reducing the increase of non-radiative light emission caused by a large number of holes, slowing down the attenuation of the organic material of the light emitting layer 3, and prolonging the service life of the organic light emitting device 10.
It should be noted that, at least two hole transport materials with different hole mobilities in the doped hole transport layer 211 are uniformly doped, so that the hole mobility of the doped hole transport layer 211 formed by doping is more uniform, and the effect of adjusting the hole transport speed of the doped hole transport layer 211 is better.
Alternatively, with continued reference to fig. 1, the organic light emitting device 10 comprises at least two sub-hole transport layers 21, and the hole mobility of the sub-hole transport layers 21 is gradually decreased along the direction from the anode layer 1 to the cathode layer 4.
Specifically, by arranging the organic light-emitting device 10 to include at least two sub-hole transport layers 21, the sub-hole transport layer 21 adjacent to the anode layer 1 has high hole mobility, which can improve the hole transport amount and speed and improve the light-emitting efficiency, and along the direction from the anode layer 1 to the cathode layer 4, the hole mobility of the sub-hole transport layer 21 is gradually reduced, so that the hole transport speed can be better adjusted, the organic light-emitting device 10 has higher light-emitting efficiency, and meanwhile, the hole aggregation on one side of the light-emitting layer 3 adjacent to the sub-hole transport layer 21 is reduced, and the service life of the organic light-emitting device 10 is prolonged.
Fig. 2 is a schematic structural diagram of another organic light emitting device provided in an embodiment of the present invention, fig. 3 is a schematic structural diagram of another organic light emitting device provided in an embodiment of the present invention, and fig. 4 is a schematic structural diagram of another organic light emitting device provided in an embodiment of the present invention. Alternatively, referring to fig. 2 to 4, a side of each doped hole transport layer 211 adjacent to the anode layer 1 includes at least one first sub-hole transport layer 212, where the first sub-hole transport layer 212 includes at least one first sub-hole transport material, and the first sub-hole transport material is a hole transport material with a larger hole mobility in the doped hole transport layer 211 corresponding to the first sub-hole transport layer 212, and/or a side of each doped hole transport layer 211 adjacent to the cathode layer 4 includes at least one second sub-hole transport layer 213, where the second sub-hole transport layer 213 includes at least one second sub-hole transport material, and the second sub-hole transport material is a hole transport material with a smaller hole mobility in the doped hole transport layer 211 corresponding to the second sub-hole transport layer 213.
Specifically, the first sub-hole transporting material is a hole transporting material with a larger hole mobility in the doped hole transporting layer 211 corresponding to the first sub-hole transporting layer 212, that is, the hole mobility of the first sub-hole transporting layer 212 is larger than the hole mobility of the corresponding doped hole transporting layer 211. By disposing the first sub-hole transporting layer 212 on the side of each doped hole transporting layer 211 adjacent to the anode layer 1, the hole transporting speed after hole injection can be increased, and the organic light emitting device 10 has higher light emitting efficiency while reducing the hole accumulation on the side of the light emitting layer 3 adjacent to the hole transporting layer 2 and increasing the lifetime of the organic light emitting device 10. In addition, the first sub-hole transport material is a material with high hole mobility in the doped hole transport layer 211, and a new hole transport material does not need to be introduced, so that the material cost of the display panel is reduced.
The second sub-hole transport material is a hole transport material with a smaller hole mobility in the doped hole transport layer 211 corresponding to the second sub-hole transport layer 213, that is, the hole mobility of the second sub-hole transport layer 213 is smaller than the hole mobility of the corresponding doped hole transport layer 211. By arranging the second sub-hole transport layer 213 on the side of each doped hole transport layer 211 adjacent to the cathode layer 4, the transport speed of holes can be better adjusted, the hole accumulation on the side of the light emitting layer 3 adjacent to the hole transport layer 2 is reduced, and the service life of the organic light emitting device 10 is prolonged. In addition, the second sub-hole transport material is a material with low hole mobility in the doped hole transport layer 211, and a new hole transport material does not need to be introduced, so that the material cost of the display panel is reduced.
It should be noted that, as shown in fig. 2, the first sub-hole transport layer 212 may be disposed only on a side of the doped hole transport layer 211 adjacent to the anode layer 1, as shown in fig. 3, the second sub-hole transport layer 213 may be disposed only on a side of the doped hole transport layer 211 adjacent to the cathode layer 4, as shown in fig. 4, the first sub-hole transport layer 212 and the second sub-hole transport layer 213 may be disposed at the same time, and this embodiment is not particularly limited, and the specific disposition mode may be determined according to the requirement of the hole transport speed.
In addition, fig. 2 to 4 only exemplarily show a case where the doped hole transport layer 211, the first sub hole transport layer 212, and the second sub hole transport layer 213 are all one layer, and do not limit the present invention, and in other embodiments, the doped hole transport layer 211, the first sub hole transport layer 212, and the second sub hole transport layer 213 may also be two or more layers.
In addition, the first sub-hole transporting layer 212 may include one first sub-hole transporting material, and may also include more than one first sub-hole transporting material. The second sub hole transporting layer 213 may include one second sub hole transporting material, and may also include more than one second sub hole transporting material. Illustratively, the doped hole transport layer 211 includes three hole transport materials A, B and C, and the mobility satisfies a < B < C. The doped hole transport layer 211 may be provided with a first sub hole transport layer 212 and a second sub hole transport layer 213, the first sub hole transport layer 212 may include only C, and in this case the second sub hole transport layer 213 may include only a or both a and B; the first sub hole transporting layer 212 may also include both B and C, in which case the second sub hole transporting layer 213 includes only a. The doped hole transport layer 211 may also be provided with two first sub-hole transport layers 212 and one second sub-hole transport layer 213, and along the direction from the anode layer 1 to the light-emitting layer 3, the two first sub-hole transport layers 211 may include C and B, respectively, or C and BC, respectively, and the second sub-hole transport layer 213 includes only a.
In addition, it should be noted that, when the first sub hole transporting layer 212 and the second sub hole transporting layer 213 include two or more hole transporting materials, doping is also performed in a uniform doping manner to ensure that the first sub hole transporting layer 212 and the second sub hole transporting layer 213 have uniform hole mobility.
Optionally, the HOMO level difference between adjacent sub-hole transport layers ranges from 0.01eV to 0.5 eV; the range of HOMO energy level difference between the sub-hole transport layer adjacent to the light-emitting layer and the light-emitting layer is 0.01 eV-0.5 eV; the difference in HOMO energy levels between at least two hole transport materials having different hole mobilities is in the range of 0.01eV to 0.5 eV.
Specifically, the HOMO level difference between adjacent sub-hole transport layers or the HOMO level difference between a sub-hole transport layer adjacent to the light emitting layer and the light emitting layer is too large, which is not favorable for the rapid injection of holes. The range of the HOMO energy level difference between the adjacent sub-hole transport layers is set to be 0.01-0.5 eV, the range of the HOMO energy level difference between the sub-hole transport layer adjacent to the light emitting layer and the light emitting layer is set to be 0.01-0.5 eV, the fact that holes are transmitted between the sub-hole transport layers and injected into the light emitting layer from the hole transport layers can be guaranteed, the small injection barrier is guaranteed, and the organic light emitting device is guaranteed to have high light emitting efficiency.
When the doped hole transport layer is formed by doping different hole transport materials with too large HOMO energy level difference, in order to ensure that the HOMO energy level difference between adjacent sub-hole transport layers or between the sub-hole transport layer adjacent to the light emitting layer and the light emitting layer is small, the value range of the doping ratio of the different hole transport materials with too large HOMO energy level difference is small, so that the adjustable range of the mobility of the doped hole transport layer is small, and the adjustment of the hole transport rate and the hole transport amount by adjusting the hole mobility is not facilitated. The range of the HOMO energy level difference of at least two hole transport materials with different hole mobilities is set to be 0.01 eV-0.5 eV, so that the adjustable range of the doping ratio meeting the energy level difference of each layer of material is large, the adjustable range of the mobility of the doped hole transport layer is ensured to be large, the mobility of the doped hole transport layer can be well adjusted by adjusting the doping ratio of the hole transport materials with at least two different hole mobilities, the hole transport speed is well adjusted, and the organic light-emitting device is ensured to have high luminous efficiency and long service life.
Optionally, with continued reference to fig. 4, at least one layer of the sub-hole transport layer 21 may be provided including a first doped hole transport layer 214, the first doped hole transport layer 214 including a first hole transport material HTL1 and a second hole transport material HTL2, the first hole transport material HTL1 having a hole mobility greater than the second hole transport material HTL 2.
Specifically, the hole mobility of the first hole transport material HTL1 is greater than that of the second hole transport material HTL2, the first hole transport material HTL1 is beneficial to increasing the transport speed of holes, so that the holes can be transported to the light emitting layer 3 fast enough, combination of the holes and electrons is realized, and the organic light emitting device 10 is beneficial to ensuring high luminous efficiency, the hole mobility of the second hole transport material HTL2 is small, so that the accumulation of the holes on the side, adjacent to the first doped hole transport layer 214, of the light emitting layer 3 is reduced, and the service life of the organic light emitting device 10 is prolonged. By providing the first doped hole transport layer 214 including the first hole transport material HTL1 and the second hole transport material HTL2, it is possible to improve the problem of the reduction in the lifetime of the organic light emitting device 10 and to ensure high luminous efficiency of the organic light emitting device 10. Meanwhile, the first doped hole transport layer 214 only includes two kinds of material doping, so that the material cost is low and the manufacturing process is simple.
Optionally, a side of the first doped hole transport layer 214 adjacent to the anode includes a first sub-hole transport layer 212; the first sub-hole transporting layer 212 comprises a first hole transporting material HTL1 and/or the side of the first doped hole transporting layer adjacent to the cathode layer 4 comprises a second sub-hole transporting layer 213, the second sub-hole transporting layer 213 comprising a second hole transporting material HTL 2.
Specifically, with reference to fig. 4, the hole transport speed after hole injection is increased by providing the first sub-hole transport layer 212 with high hole mobility, and the hole transport speed is adjusted by the cooperation of the first doped hole transport layer 214 and the first sub-hole transport layer 212, so that the organic light emitting device 10 has high light emitting efficiency, and the lifetime of the organic light emitting device 10 is prolonged. The first doped hole transport layer 214 and the second sub hole transport layer 213 cooperate to adjust the hole transport speed, so that the accumulation of holes on the side of the light-emitting layer 3 adjacent to the second sub hole transport layer 213 is reduced, and the service life of the organic light-emitting device 10 is prolonged.
Alternatively, fig. 5 is a schematic structural diagram of another organic light emitting device provided in the embodiment of the present invention. Referring to fig. 5, the at least one sub-hole transporting layer further includes a second doped hole transporting layer 215, and the second doped hole transporting layer 215 is disposed on a side of the first doped hole transporting layer 214 adjacent to the light emitting layer 3; the second doped hole transport layer 215 includes a third hole transport material HTL3 and a fourth hole transport material HTL 4; the hole transport rate of the second hole transport material HTL2 is greater than or equal to that of the third hole transport layer; the hole mobility of the third hole transport material HTL3 is greater than that of the fourth hole transport material HTL 4.
Specifically, in the process of transmitting holes from the anode layer 1 to the light-emitting layer 3, the holes pass through the first doped hole transport layer 214 and the second doped hole transport layer 215 with different hole mobilities, so that the hole transport speed can further meet the requirement of the light-emitting ratio of electrons and holes of the light-emitting layer 3, the accumulation of the holes on the side, adjacent to the anode layer 1, of the light-emitting layer 3 is reduced, and the service life of the organic light-emitting device 10 is better prolonged.
Optionally, a first sub-hole transport layer and a second sub-hole transport layer may be further disposed on two sides of the second doped hole transport layer 215, so as to ensure that the organic light emitting device 10 has higher light emitting efficiency, further reduce the accumulation of holes on the side of the light emitting layer 3 adjacent to the anode layer 1, and improve the lifetime of the organic light emitting device.
Alternatively, fig. 6 is a schematic structural diagram of another organic light emitting device provided in the embodiment of the present invention. Referring to fig. 6, the organic light emitting device 10 further includes a hole injection layer 5, the hole injection layer 5 being disposed between at least one of the sub-hole transport layers 21 and the anode layer 1, the hole injection layer 5 including a first hole transport material HTL1 and a hole injection material HIL.
Specifically, the hole injection layer 5 of the organic light emitting device 10 may include the first hole transport material HTL1 and the hole injection material HIL, so that the hole injection layer 5 has both high hole injection efficiency of the hole injection material HIL and high hole transport speed of the first hole transport material HTL1, and the hole injection layer 5 may be matched with the sub-hole transport layer 21 to adjust the hole transport speed while ensuring that the organic light emitting device 10 has high hole injection efficiency, thereby further ensuring that the organic light emitting device 10 has high efficiency and long service life.
Alternatively, the doping ratio of the first hole transport material HTL1 and the second hole transport material HTL2 of the first doped hole transport layer 214 is 1% to 50%, and the doping ratio of the third hole transport material HTL3 and the fourth hole transport material HTL4 of the second doped hole transport layer 215 is 1% to 50%.
Specifically, the hole mobility of the first hole transport material HTL1 is greater than that of the second hole transport material HTL2, and the increase of the first hole transport material HTL1 increases the hole transport speed, increases the probability of hole-electron (exciton) recombination light emission, and increases the efficiency of the organic light emitting device 10, and when the doping ratio of the first hole transport material HTL1 and the second hole transport material HTL2 of the first doped hole transport layer 214 is higher than 50%, the hole injection speed and the hole injection amount of the organic light emitting device are too high, so that the accumulation amount of interface holes at the side of the light emitting layer 3 adjacent to the anode is increased, and the service life of the organic light emitting device 10 is affected. When the doping ratio of the first hole transport material HTL1 and the second hole transport material HTL2 of the first doped hole transport layer 214 is lower than 1%, the second hole transport material HTL2 is excessive, and the hole transport speed to the light emitting layer 3 is affected due to the low hole mobility of the second hole transport material HTL2, the probability of hole-electron (exciton) recombination light emission is reduced, and the efficiency of the organic light emitting device 10 is affected, and by controlling the doping ratio of the two materials to be 1% to 50%, the organic light emitting device is ensured to have high light emitting efficiency, the accumulation amount of interface holes on the side of the light emitting layer 3 adjacent to the anode layer 1 is relatively small, and the service life of the organic light emitting device 10 is prolonged. Alternatively, the doping ratio of the first hole transport material HTL1 and the second hole transport material HTL2 of the first doped hole transport layer 214 is 10% to 30%, and the doping ratio of the third hole transport material HTL3 and the fourth hole transport material HTL4 of the second doped hole transport layer 215 is 10% to 30%.
Alternatively, the first hole transport material HTL1 comprises 4,4 '-cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ], the second hole transport material HTL2 comprises N, N' -diphenyl-N, N '- (1-naphthyl) -1,1' -biphenyl-4, 4 '-diamine, the third hole transport material HTL3 comprises N, N' -diphenyl-N, N '-bis (3-methylphenyl) -1,1' -biphenyl-4, 4 '-diamine, and the fourth hole transport material HTL4 comprises 4,4',4 "-tris (carbazol-9-yl) triphenylamine.
TABLE 1 parameters of hole mobility and energy level for hole transport layer materials
Specifically, with reference to table 1, the HOMO level and mobility of the first doped hole transport layer 214 are between the HOMO levels of the first hole transport material HTL1 and the second hole transport material HTL2, the HOMO level and mobility of the second doped hole transport layer 215 are between the HOMO levels of the third hole transport material HTL3 and the fourth hole transport material HTL4, and the hole mobility difference between the first hole transport material HTL1, the second hole transport material HTL2, the third hole transport material HTL3, and the fourth hole transport material HTL4 is moderate and small, and the adjustable range of the hole mobility of the doped hole transport layer is ensured to be large by setting the first doped hole transport layer 214 and the second doped hole transport layer 215 to use the above materials, so that the adjustable range of the doping ratio satisfying the energy level difference of each layer is ensured to be large, and the hole mobility of the doped hole transport layer can be well adjusted by adjusting the doping ratio of at least two hole transport materials having different hole mobilities, therefore, the hole transport speed is well adjusted, and the organic light-emitting device is ensured to have higher luminous efficiency and longer service life. And the hole transport material has lower cost, and is beneficial to reducing the manufacturing cost of the display panel.
The present embodiment further provides a display panel, where the display panel includes the organic light emitting device according to any of the above embodiments, and has the beneficial effects of the organic light emitting device provided in the above embodiments, and details are not repeated herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An organic light-emitting device, comprising: the anode layer, at least one layer of sub-hole transport layer, the light emitting layer and the cathode layer are sequentially stacked and arranged on the anode layer;
the at least one sub-hole transport layer comprises at least one doped hole transport layer comprising at least two hole transport materials having different hole mobilities.
2. The organic light emitting device of claim 1, wherein:
the organic light-emitting device comprises at least two sub-hole transport layers, and the hole mobility of the sub-hole transport layers is gradually reduced along the direction from the anode layer to the cathode layer.
3. The organic light emitting device of claim 2, wherein:
one side of each doped hole transport layer, which is adjacent to the anode layer, comprises at least one first sub-hole transport layer, the first sub-hole transport layer comprises at least one first sub-hole transport material, and the first sub-hole transport material is a hole transport material with higher hole mobility in the doped hole transport layer corresponding to the first sub-hole transport layer;
and/or one side of each doped hole transport layer, which is adjacent to the cathode layer, comprises at least one second sub-hole transport layer, the second sub-hole transport layer comprises at least one second sub-hole transport material, and the second sub-hole transport material is a hole transport material with lower hole mobility in the doped hole transport layer corresponding to the second sub-hole transport layer.
4. The organic light emitting device of claim 1, wherein:
the range of HOMO energy level difference between the adjacent sub-hole transport layers is 0.01 eV-0.5 eV;
the HOMO level difference between the sub-hole transport layer adjacent to the light emitting layer and the light emitting layer ranges from 0.01eV to 0.5 eV;
the difference in HOMO energy levels between at least two hole transport materials having different hole mobilities is in the range of 0.01eV to 0.5 eV.
5. An organic light-emitting device according to any one of claims 1 to 4, wherein:
the at least one sub-hole transport layer comprises a first doped hole transport layer, the first doped hole transport layer comprises a first hole transport material and a second hole transport material, and the hole mobility of the first hole transport material is greater than the hole mobility of the second hole transport material.
6. The organic light emitting device of claim 5, wherein:
the at least one sub-hole transport layer further comprises a second doped hole transport layer, and the second doped hole transport layer is arranged on one side, close to the light-emitting layer, of the first doped hole transport layer;
the second doped hole transport layer comprises a third hole transport material and a fourth hole transport material; the hole transport rate of the second hole transport material is greater than or equal to the hole transport rate of the third hole transport layer; the third hole transport material has a hole mobility greater than a hole mobility of the fourth hole transport material.
7. The organic light-emitting device according to claim 5, further comprising:
a hole injection layer disposed between the at least one sub-hole transport layer and the anode layer, the hole injection layer comprising a first hole transport material and a hole injection material.
8. The organic light emitting device of claim 6, wherein:
the doping proportion of the first hole transport material and the second hole transport material of the first doped hole transport layer is 1% -50%;
the doping proportion of the third hole transport material and the fourth hole transport material of the second doped hole transport layer is 1% -50%.
9. The organic light emitting device of claim 8, wherein:
the first hole transport material comprises 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ];
the second hole transport material comprises N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine; the third hole transport material comprises N, N '-diphenyl-N, N' -bis (3-methylphenyl) -1,1 '-biphenyl-4, 4' -diamine; the fourth hole transport material comprises 4,4' -tris (carbazol-9-yl) triphenylamine.
10. A display panel comprising the organic light-emitting device according to any one of claims 1 to 9.
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