CN108539030B - Organic light-emitting display panel and display device thereof - Google Patents
Organic light-emitting display panel and display device thereof Download PDFInfo
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
- H10K50/165—Electron transporting layers comprising dopants
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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
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Abstract
The invention provides an organic light-emitting display panel and a display device thereof, relates to the technical field of display, and aims to improve color cast under a large viewing angle. Wherein the organic light emitting display panel includes: an organic light emitting device including a first electrode and a second electrode, and an organic functional layer between the first electrode and the second electrode; the organic functional layer comprises an electron transport layer, wherein at least first metal is doped in the electron transport layer, the first metal is alkaline earth metal or rare earth metal, and the refractive index of the electron transport layer corresponding to light with the wavelength of 550nm meets the following requirements: n1 (lambda is 550nm) is less than or equal to 1.9. The organic light emitting display panel is suitable for a display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display panel and a display device thereof.
Background
The most information-receiving sense organs of human beings are the visual organs (eyes), and people are increasingly required to utilize abundant visual information in production and life, so that display technology plays a very important role in the human society today. Display technology is emerging from the present, the technology development is also very rapid, and with the development of society and the continuous improvement of human demand for living of materials, the current display technology is rapidly advancing towards high contrast, high resolution, full-color display, low power consumption, high reliability, long service life and thinness and lightness.
Among them, the Organic Light-Emitting Diode (OLED) display device has the advantages of self-luminescence, fast response speed, wide viewing angle, high definition, high brightness, strong bending resistance, low power consumption, etc., and is gradually becoming a powerful competitor of the liquid crystal display panel, and is known as the next generation of illusive display technology.
The problem of relatively serious color cast under a large viewing angle is that the problem is ubiquitous and needs to be solved in the OLED display device.
Disclosure of Invention
The embodiment of the invention provides an organic light-emitting display panel and an organic light-emitting display device thereof, which are used for improving color cast under a large viewing angle.
In a first aspect, the present invention provides an organic light emitting display panel including:
an organic light emitting device including a first electrode and a second electrode, and an organic functional layer between the first electrode and the second electrode;
the organic functional layer comprises an electron transport layer, wherein,
the electron transport layer is at least doped with a first metal, the first metal is alkaline earth metal or rare earth metal, and the refractive index of the electron transport layer corresponding to light with the wavelength of 550nm meets the following requirements: n1 (lambda is 550nm) is less than or equal to 1.9.
In a second aspect, the present invention provides a display device comprising the organic light emitting display panel according to the first aspect of the present invention.
Any one of the above technical solutions has the following beneficial effects:
in this embodiment, since the refractive index of the first metal doped in the electron transport layer is low, the refractive index of light at 550nm is smaller than 1.9 after the first metal is doped in the electron transport layer, so that the emitted light passes through the electron transport layer, the original transmission path is changed, the light is emitted closer to the normal direction, that is, at the normal viewing angle or at a small angle close to the normal viewing angle, and further the angle of the light emitted from the second electrode (cathode) to the air is small, thereby avoiding the emission at a large viewing angle, and further avoiding the color cast at a large viewing angle. Compared with the prior art, the present embodiment can effectively improve the color shift phenomenon under a large viewing angle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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 terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe metals in embodiments of the present invention, these metals should not be limited by these terms. These terms are only used to distinguish metals from one another. For example, a first metal may also be referred to as a second metal, and similarly, a second metal may also be referred to as a first metal, without departing from the scope of embodiments of the present invention.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.
Before the present embodiment is described in detail, the structure of the organic light emitting display panel will be briefly described:
as shown in fig. 1, a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention is provided, where the organic light emitting display panel 1 includes a first substrate 10, a plurality of organic light emitting devices 11 disposed on a side surface of the first substrate 10, each organic light emitting device 11 includes a first electrode 12, a second electrode 14, and an organic functional layer 13 disposed between the first electrode 12 and the second electrode 14, the first electrode 12 is in contact with a side surface of the first substrate 10, and the second electrode 14 is located on a side surface of the organic functional layer 13 facing away from the first substrate 10. It should be noted that the first electrode 12 and the second electrode 14 are both common film layers, and thus the first electrode 12 and the second electrode 14 in fig. 1 are both one integral film layer.
It is understood that the first substrate 10 in this embodiment may be a flexible substrate, and the corresponding organic light emitting display panel 1 may be a flexible organic light emitting display panel, and the flexible organic light emitting display panel has special effects of low power consumption and being bendable, and is suitable for various display devices, especially for wearable display devices. Optionally, the flexible substrate is made of polyester imide or polyethylene terephthalate resin. In addition, the first substrate 10 may also be a rigid substrate, and the corresponding organic light emitting display panel 1 is a rigid organic light emitting display panel. In fact, the material of the organic light emitting display panel is not particularly limited in this embodiment.
In this embodiment, the first electrode 12 may be understood as an anode to which a positive voltage is applied during electroluminescence (first electrode 12). The material of the first electrode 12 in this embodiment may be ito. Specifically, the first electrode 12 at least includes a reflective film, the reflective film may be located on a surface of the first electrode 12 facing away from the first substrate 10, and the material of the reflective film may be silver. The first electrode 12 may further include a transparent conductive film on a surface of the reflective film facing away from the first substrate 10, and the transparent conductive film may be made of indium tin oxide or indium zinc oxide.
In this embodiment, the second electrode 14 can be understood as a cathode to which a negative voltage can be applied during electroluminescence (second electrode 14). The material of the second electrode 14 may be a low-function metal material such as Ag, Al, Ca, In, Li, Mg, or a low-work-function composite metal material. The material of the second electrode 14 in this example may be one of a silver alloy, a silver-ytterbium alloy, or a silver-rare earth metal alloy.
It is understood that the organic light emitting display panel 1 has m light emission colors, m is an integer greater than or equal to 3, and the exemplary embodiment may include three light emission colors, red, green and blue, respectively, and each organic light emitting device 11 corresponds to one light emission color.
With continued reference to fig. 1, the organic light emitting display panel 1 in this example can be understood as a top emission organic light emitting display panel, that is, the first electrode 12 can be understood as a total reflection anode, and the second electrode 14 can be understood as a semi-transparent cathode, wherein the total reflection anode (the first electrode 12) and the semi-transparent cathode (the second electrode 14) form a microcavity (resonant cavity), and when the microcavity length and the wavelength of the light wave satisfy a certain relationship, the light with a specific wavelength (the wavelength of a certain monochromatic light) is enhanced, the spectrum is narrowed, and the microcavity effect occurs. The microcavity effect has functions of selecting, narrowing, and enhancing a light source, and is often used to improve chromaticity of an organic light emitting device, enhance emission intensity of a specific wavelength, change a light emitting color of the organic light emitting device, and the like.
In the prior art, the microcavity effect includes two interference modes, namely wide-angle interference and multi-beam interference, wherein the wide-angle interference affects the viewing angle characteristics of the organic light emitting device, that is, the light emission peak shifts with the shift of the viewing angle, which results in luminance difference and chromaticity drift, and especially under a large viewing angle, the optical property is poor and the color shift is serious.
If the angle at which the eyes are perpendicular to the screen is referred to as a positive viewing angle, the angle can be set to 0 °, and the microcavity effect of the light emitted at the angle is most obvious, that is, the light emitted at the viewing angle is full in color and does not have color cast or the color cast is not perceived by human eyes. When the eye is tilted to the left or right, the angle is an absolute value, for example, the eye is tilted to the right by 45 °, the angle is 45 °, the eye is tilted to the left by 45 °, and the angle is 45 °. And the large viewing angle can be understood by increasing the angle of the oblique viewing angle to a certain degree, and under the large viewing angle, the luminous peak shifts, which causes color cast.
In order to solve the above problems, the inventors have devised the following technical solutions:
the present embodiment provides an organic light emitting display panel, as shown in fig. 2, which is another schematic structural diagram of the organic light emitting display panel provided in the embodiment of the present invention, the organic light emitting display panel 1 includes an organic light emitting device 11, and exemplarily takes an organic light emitting device shown in fig. 2 as an example, and the organic light emitting device 11 receives the organic light emitting device, as shown in fig. 2, the organic light emitting device 11 includes a first electrode 12 and a second electrode 14, and an organic functional layer 13 located between the first electrode 12 and the second electrode 14.
Continuing to refer to fig. 2, the organic functional layer 13 includes an electron transport layer 131, wherein the electron transport layer 131 is doped with at least a first metal 1311, the first metal 1311 is an alkaline earth metal or a rare earth metal, and the refractive index of the electron transport layer 131 with respect to light having a wavelength of 550nm satisfies: n1 (lambda is 550nm) is less than or equal to 1.9.
It should be noted that, for the top-emission organic light-emitting device which is beneficial to the microcavity effect to emit light, the light-emitting characteristics are related to the resonance of light with a specific wavelength in the microcavity, and at the same time, the light-emitting characteristics are related to the thickness and the refractive index of each layer of material, the refractive index is small, and the light is emitted in the direction close to the normal, that is, the light is emitted from the normal angle or a small angle close to the normal angle, so that the emission under the large viewing angle is avoided, and the color shift phenomenon under the large viewing angle is avoided.
The refractive index n1(λ 550nm) of the electron transport layer at a wavelength of 550nm is less than or equal to 1.9, and after a plurality of experiments by the inventor, the inventor finds that, at the wavelength of 550nm, the color shift is obviously towards a small angle after the refractive index is more than 1.9, namely, the color shift phenomenon also occurs at a small viewing angle. In the present embodiment, the refractive index n1(λ 550nm) of the electron transport layer at a wavelength of 550nm is preferably equal to or less than 1.7. When the wavelength of 550nm is less than 1.7, the electron transport layer has better effect, and light is emitted from the direction close to the normal (positive viewing angle), so that the emission relationship of a large viewing angle can be effectively avoided, and further, the color cast of the large viewing angle is avoided.
In this embodiment, since the refractive index of the first metal doped in the electron transport layer 131 is low, the refractive index of light at 550nm of the electron transport layer after doping the first metal is smaller than 1.9, so that the light emitted from the light emitting layer passes through the electron transport layer 131, the original transmission path is changed, the light is emitted in the direction close to the normal, that is, at the normal viewing angle or at a small angle close to the normal viewing angle, and the angle of the light emitted from the second electrode 14 (cathode) into the air is small, thereby avoiding the emission at a large viewing angle, and further avoiding the color cast at a large viewing angle. Compared with the prior art, the present embodiment can effectively improve the color shift phenomenon under a large viewing angle.
Since the color of the light emitted from the organic light emitting device 11 in this embodiment can be any one of red, green and blue, the embodiment can adjust the refractive index of the electron transport layer included therein according to the intensity of color shift of different colors, thereby improving the viewing angle color shift phenomenon under a large viewing angle of each light emitting color.
In order to clearly understand the present embodiment, the following briefly describes the light emitting principle of the organic light emitting display panel of the present embodiment:
as shown in fig. 3, which is a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention, the organic functional layer 13 includes an electron transport layer 131, a hole transport layer 133, and a light emitting layer 132, wherein the electron transport layer 131 is disposed near the second electrode 14, the hole transport layer 133 is disposed near the first electrode 12, and the light emitting layer 132 is disposed between the electron transport layer 131 and the hole transport layer 133.
Under the action of the applied electric field, electrons e are injected from the second electrode 14 (cathode) into the organic functional layer 13, and holes h are injected from the first electrode 12 (anode) into the organic functional layer 13. The injected electrons e migrate from the electron transport layer 131 of the organic functional layer 13 to the light emitting layer 132, and the injected holes h migrate from the hole transport layer 133 of the organic functional layer 13 to the light emitting layer 132. The injected electrons e and the injected holes h generate excitons after recombination in the light-emitting layer 132. The excitons migrate under the action of the electric field, transferring energy to the organic light emitting molecules in the light emitting layer 132, electrons of the organic light emitting molecules transition from a ground state to an excited state and release energy, and finally the energy is released in the form of photons and emits light.
In addition, taking a top-emission organic light-emitting display panel as an example, how to improve wide-angle (large viewing angle) color shift in this embodiment is explained:
as shown in fig. 4, which is another schematic structural diagram of the organic light emitting display panel according to the embodiment of the present invention, after the injected electrons e and the injected holes h are recombined in the light emitting layer 132, the generated light is emitted from the light emitting layer 132 toward the second electrode 14 (semi-transparent cathode), and after the light passes through the electron transport layer 131, the light is emitted in a direction close to the normal, that is, in a direction close to the normal viewing angle or a smaller viewing angle, because the refractive index of the electron transport layer after being doped with the first metal 1311 is decreased. Since the light is not emitted through a large viewing angle, color cast under the large viewing angle is avoided, and the color cast phenomenon of the large viewing angle can be improved or even eliminated by the embodiment.
It is understood that the area of the pixel unit is understood as the aperture ratio of the pixel unit, and the larger the area, the higher the aperture ratio, and the higher the brightness. The luminous intensity is understood to mean the total amount of light emitted in a particular direction of emission. The light emission luminance is understood to be the light emission intensity per unit area.
Further, in a specific embodiment, the first metal can be a lanthanide metal. The lanthanide metal can reduce the work function of the electron transport layer and increase the mobility of electrons, that is, electrons generated by the cathode (second electrode) can more easily reach the electron transport layer in the migration process.
Further, in a more specific embodiment, the first metal may be ytterbium or samarium. Among the numerous lanthanides, ytterbium or samarium is preferred in this embodiment after the combination of price and effect of use.
In one embodiment, the volume ratio P1 of the first metal in the electron transport layer is P1 ≦ 7%. When the doping concentration is high, the local concentration is possibly far higher than the doping concentration, and defects are generated; when the doping concentration is too low, the refractive index of the electron transport layer at a specific wavelength cannot meet the requirement, and the improvement effect of viewing angle color cast is not obvious. Furthermore, uniformity is difficult to guarantee when low concentration doping is controlled by the process. Therefore, the volume proportion P1 of the first metal in the resistance transmission layer is less than or equal to 7 percent.
In an implementation manner, as shown in fig. 5, which is another schematic structural diagram of the organic light emitting display panel provided in the embodiment of the present invention, the electron transport layer 131 further includes a second metal 1312, and a refractive index of the second metal 1312 is smaller than a refractive index of the first metal 1311. The refractive index of the second metal 1312 is smaller, so that when the second metal 1312 is doped into the electron transport layer 131, the refractive index of the electron transport layer 131 at a specific wavelength (550nm) is smaller, and the smaller refractive index can further improve the large viewing angle color shift of the light emitted from the electron transport layer 131. Specifically, as shown in fig. 6, which is another schematic structural diagram of the organic light emitting display panel according to the embodiment of the present invention, after the light emitted from the light emitting layer 132 passes through the electron transport layer 131, since the electron transport layer 131 is doped with the first metal 1311 and the second metal 1312, the refractive index of the electron transport layer 131 at a specific wavelength (550nm) is small, so that the light emitted through the electron transport layer 131 is emitted in a direction close to a normal line, that is, in a direction close to a normal viewing angle or in a small-angle viewing angle, and is prevented from being emitted from a large viewing angle, thereby preventing color cast at the large viewing angle.
In addition, since the first metal 1311 is a lanthanoid, the electron transition barrier can be effectively reduced, the mobility of electrons can be increased, more electrons can be transferred from the cathode (the second electrode 14) to the light-emitting layer 132, the recombination rate of electrons and holes can be increased, and the light extraction efficiency can be improved.
In one embodiment, the refractive index of the second metal for light having a wavelength of 550nm satisfies: n2 (lambda is 550nm) is less than or equal to 1.7. The refractive index of the second metal is lower than that of the first metal, so that after the second metal is doped into the electron transmission layer, the refractive index of the electron transmission layer is lower, light rays can be emitted in the direction close to a normal (positive viewing angle) more favorably, and the viewing angle color cast phenomenon under a large viewing angle is avoided.
Further, in a specific embodiment, the second metal may be an alkaline earth metal. The alkali metal has a relatively low refractive index and is easily doped with the electron transport layer.
Still further, in a more specific embodiment, the second metal is magnesium or calcium. In this embodiment, after considering the economical efficiency and the practical applicability, the second metal is preferably magnesium or calcium. After magnesium with proper concentration is doped into the electron metal layer, the refractive index of the electron transmission layer under specific wavelength (550nm) can reach about 1.0, so that light is prevented from being emitted from a large viewing angle when passing through the electron transmission layer, and the color cast under the large viewing angle is effectively improved.
In one embodiment, the second metal has a volume fraction P2 in the electron transport layer in the range of P2 ≦ 6%. When the volume proportion of the second metal in the electron transport layer is more than 6%, the local concentration is far greater than the doped concentration easily, and defects are generated; when the doping concentration is too low, the refractive index of the electron transport layer at a specific wavelength cannot meet the requirement, and the improvement effect of viewing angle color cast is not obvious. Furthermore, uniformity is difficult to guarantee when low concentration doping is controlled by the process. Therefore, the volume ratio P2 of the second metal in the electron transport layer in the embodiment is less than or equal to 6%.
Still taking the top-emission organic light-emitting display panel as an example, as shown in fig. 7, which is another schematic structural diagram of the organic light-emitting display panel provided in the embodiment of the present invention, the organic light-emitting display panel further includes a cap layer 15, and the cap layer 15 is disposed on a side surface of the second electrode 14 facing away from the first electrode 12. On one hand, the cap layer 15 in this embodiment protects the second electrode 14 of the organic light emitting display panel from being oxidized, thereby protecting the organic light emitting device from being oxidized; on the other hand, since the cap layer 15 has a higher refractive index, reflection of light emitted from the light-emitting layer 132 is reduced, more light is emitted near the normal line or near the normal line, and light extraction efficiency is improved.
In this embodiment, a display device is provided, as shown in fig. 8, which is a schematic structural diagram of the display device provided in the embodiment of the present invention, and the display device 500 includes the organic light emitting display panel 1 according to this embodiment. It should be noted that, although fig. 8 illustrates a mobile phone, the display device is not limited to the mobile phone, and specifically, the display device may include, but is not limited to, any electronic device with a display function, such as a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), an MP4 player, or a television.
In this embodiment, the display device 500 includes the above-mentioned organic light emitting display panel 1, and therefore, in the display device 500, since the refractive index of the first metal 1311 doped in the electron transport layer 131 is low, the refractive index of light at 550nm of the electron transport layer 131 after doping the first metal 1311 is smaller than 1.9, so that after the emitted light passes through the electron transport layer 131, the original transmission path is changed, and the light is emitted closer to the normal direction, that is, at a normal viewing angle or a small angle close to the normal viewing angle, so that the angle of the light emitted from the second electrode 14 (cathode) into the air is smaller, and the light is prevented from being emitted at a large viewing angle, and the color shift phenomenon at a large viewing angle is avoided. Compared with the prior art, the present embodiment can effectively improve the color shift phenomenon under a large viewing angle.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. An organic light emitting display panel, comprising:
an organic light emitting device including a first electrode and a second electrode, and an organic functional layer between the first electrode and the second electrode;
the organic functional layer comprises an electron transport layer, wherein,
the electron transport layer is at least doped with a first metal, and the first metal is alkaline earth metal or rare earth metal, so that the refractive index of the electron transport layer after the electron transport layer is doped with the first metal and corresponding to light with the wavelength of 550nm satisfies the following conditions: n1 (lambda is 550nm) is less than or equal to 1.9, and the volume of the first metal in the electron transport layer is P1, which is P1 is less than or equal to 7%;
the electron transport layer further comprises a second metal, the refractive index of the second metal is smaller than that of the first metal, and the refractive index of the second metal corresponding to light with the wavelength of 550nm satisfies the following conditions: n2 (lambda is 550nm) is less than or equal to 1.7, and the volume of the second metal in the electron transport layer is P2, which is in the range of P2 is less than or equal to 6%.
2. The organic light-emitting display panel according to claim 1, wherein the first metal is a lanthanide metal.
3. The organic light-emitting display panel of claim 1, wherein the first metal is ytterbium or samarium.
4. The organic light-emitting display panel according to claim 1, wherein the second metal is an alkaline earth metal.
5. The organic light-emitting display panel according to claim 1, wherein the second metal is magnesium or calcium.
6. A display device comprising the organic light emitting display panel according to any one of claims 1 to 5.
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