CN114122098A - Organic electroluminescent device, display device and lighting device - Google Patents

Organic electroluminescent device, display device and lighting device Download PDF

Info

Publication number
CN114122098A
CN114122098A CN202111411202.1A CN202111411202A CN114122098A CN 114122098 A CN114122098 A CN 114122098A CN 202111411202 A CN202111411202 A CN 202111411202A CN 114122098 A CN114122098 A CN 114122098A
Authority
CN
China
Prior art keywords
layer
organic electroluminescent
light emitting
emitting layer
peak wavelength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111411202.1A
Other languages
Chinese (zh)
Inventor
朱波
姜坤
曹建华
董焕章
唐伟
王志杰
李程辉
徐先锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai 800 Million Spacetime Advanced Material Co ltd
Original Assignee
Shanghai 800 Million Spacetime Advanced Material Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai 800 Million Spacetime Advanced Material Co ltd filed Critical Shanghai 800 Million Spacetime Advanced Material Co ltd
Priority to CN202111411202.1A priority Critical patent/CN114122098A/en
Publication of CN114122098A publication Critical patent/CN114122098A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Landscapes

  • Electroluminescent Light Sources (AREA)

Abstract

The invention relates to an organic electroluminescent device, a display device and a lighting device, wherein the organic electroluminescent device integrates an organic electroluminescent element and an independent unit multiple luminescent layer of an external luminescent layer, materials with poor thermal stability or oxidation and reduction stability but high internal quantum efficiency are moved out of the organic electroluminescent element and transferred to the outside of the light-emitting side of the organic electroluminescent element, and the emitted light of the organic electroluminescent element is utilized to excite the materials of the external luminescent layer to simultaneously emit light or only the external luminescent layer emits light, so that the materials with poor stability are prevented from directly contacting with an electron, and the luminous efficiency and the service life are improved.

Description

Organic electroluminescent device, display device and lighting device
Technical Field
The invention belongs to the technical field of display, and particularly relates to an organic electroluminescent device, a display device and an illuminating device.
Background
An organic electroluminescent element (OLED) is formed by stacking a cathode, an anode, and an organic light emitting material between the cathode and the anode, converts electrical energy into light by applying a voltage across the cathode and the anode of the element, and has advantages of a wide angle of view, a high contrast, and a faster response time. Tang and Van Slyke of Issman Kodak in 1987 reported an organic light-emitting element having an arylamine hole-transporting layer and a tris (8-hydroxyquinoline) aluminum layer as an electron-transporting layer and a light-emitting layer (Applied Physics Letters,1987,51(12): 913-915). The invention lays the foundation for the development of modern Organic Light Emitting Diodes (OLEDs) by applying a voltage across the element such that green light is emitted from the element. OLEDs have advantages of low cost, low power consumption, high brightness, wide viewing angle, thin thickness, etc., and have been widely used in the display and lighting fields through decades of development.
In general, organic light emitting layers can be classified into three types according to the light emitting mechanism: fluorescent materials, phosphorescent materials, and thermally delayed fluorescence (TADF) materials. Fluorescent materials were first used in the fabrication of OLEDs, and subsequently around 1998 phosphorescent materials were successfully used in OLEDs technology, and have better energy efficiency than fluorescent materials. In recent years, TADF materials have attracted attention from various countries with efficiency comparable to that of phosphorescent materials.
In addition to the high manufacturing cost of the phosphorescent material, blue light has been the largest mask of the phosphorescent material, and even after 20 years of research on the production, the blue phosphorescent material with efficiency, stability and pure color cannot be developed, while the desirable TADF material has too wide spectrum and impure emitted light color. In all today's OLEDs, fluorescent materials are still used as the blue light source, and in order to have sufficient brightness, the size of the blue pixels is about twice that of the red and green, and the efficiency and lifetime are still short. There are many factors affecting the efficiency and lifetime of OLEDs, and in the OLEDs, since electrons and holes are injected into the elements under an external driving voltage, a large amount of heat is generated, and the thermal stability and the redox stability of organic materials affect the lifetime of the elements.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an organic electroluminescent device, a display device and a lighting device, wherein the organic electroluminescent device integrates an organic electroluminescent element and an independent unit multiple luminescent layer of an external luminescent layer, a material with poor thermal stability or poor oxidation and reduction stability but high internal quantum efficiency is moved out of the organic electroluminescent element and transferred to the outside of the light emitting side of the organic electroluminescent element, and the emitted light of the organic electroluminescent element is used to excite the material of the external luminescent layer to emit light at the same time or only the external luminescent layer is made to emit light, so that the material with poor stability is prevented from directly contacting with an electron emitter, and the light emitting efficiency and the service life are improved.
A first object of the present invention is to provide an organic electroluminescence device including a substrate, an organic electroluminescence element disposed on the substrate, and an external electric drive, further including an external light emitting layer disposed above the organic electroluminescence element and on an emission direction side of the organic electroluminescence element, and a protective layer disposed above the external light emitting layer.
Further, the organic electroluminescent element comprises an anode layer, a cathode layer and at least one organic layer disposed between the anode layer and the cathode layer, the external electric drive being connected to the anode layer and the cathode layer, respectively.
Furthermore, the external light-emitting layer is in contact connection with the organic electroluminescent element, and the protective layer is in contact connection with the external light-emitting layer.
Further, the external light emitting layer may be one or more layers.
Further, the organic electroluminescent element emits a first intrinsic peak wavelength, and the external light emitting layer emits a second intrinsic peak wavelength.
Further, when the external electric drive provides an operating current density to the organic electroluminescent element, the organic electroluminescent element can emit a first spectrum and generate a first light-emitting area, the first spectrum comprises a first intrinsic peak wavelength, the first spectrum excites the external light-emitting layer to emit a second spectrum to generate a second light-emitting area, the second spectrum comprises a second intrinsic peak wavelength, the ratio of the peak intensities of the first intrinsic peak wavelength and the second intrinsic peak wavelength is not higher than 1, and the first light-emitting area and the second light-emitting area are overlapped.
Furthermore, the first intrinsic peak wavelength is 380-620 nm, and the second intrinsic peak wavelength is larger than 460nm and smaller than or equal to 1000 nm.
Further, the second intrinsic peak wavelength is 460-800 nm.
Further, when the external electric drive provides an operating current density to the organic electroluminescent element, the organic electroluminescent element can emit a first spectrum that excites the external light emitting layer to emit a second spectrum that includes a first intrinsic peak wavelength and a second intrinsic peak wavelength, and a ratio of a peak intensity of the second intrinsic peak wavelength to a peak intensity of the first intrinsic peak wavelength is greater than 1.5.
Further, the external electric drive is a display panel backplane circuit or a lighting panel backplane circuit.
In a second aspect of the present invention, there is provided a display device comprising the organic electroluminescent device.
In a third aspect of the present invention, there is provided a lighting device comprising the organic electroluminescent device.
Compared with the prior art, the invention has the beneficial effects that:
(1) the organic electroluminescent device integrates the organic electroluminescent element and the organic electroluminescent device of the independent unit multi-luminescent layer of the external luminescent layer, materials with poor thermal stability or oxidation and reduction stability but high internal quantum efficiency are moved out of the organic electroluminescent element and transferred to the outside of the light-emitting side of the organic electroluminescent element, the emitted light of the organic electroluminescent element is utilized to excite the material of the external luminescent layer to simultaneously emit light, or only the external luminescent layer is made to emit light, the material with poor stability is prevented from directly contacting with an electron, the luminous efficiency is improved, and the service life is prolonged;
(2) the organic electroluminescent device can emit light with single color under the working current density, has the advantages of refined structure, simple process, low voltage, no occupation of additional light-emitting area, no need of additional circuit drive, and great advantage of being integrated in a display panel by a single crisp or being prepared into a lighting lamp source.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 drawings without creative efforts.
FIG. 1 is a schematic view of a first top-emission device of the present invention incorporating an organic electroluminescent element and an external light-emitting layer;
FIG. 2 is a schematic view of a second top-emitting device of the present invention incorporating an organic electroluminescent element and an external light-emitting layer;
FIG. 3 is a schematic view of a bottom emission device of the present invention integrating an organic electroluminescent element and an external light emitting layer;
FIG. 4 is a schematic view of an organic electroluminescent device according to comparative example 1 of the present invention;
fig. 5 is a schematic view of a top emission device of the present invention integrating an organic electroluminescent element and two external light emitting layers.
Reference numerals
101-substrate, 102-anode layer, 103-hole injection layer, 104-hole transport layer, 105-electron blocking layer, 106-first organic light emitting layer, 107-hole blocking layer, 108-electron transport layer, 109-electron injection layer, 110-cathode layer, 111-external light emitting layer, 112-protective layer, 113-third light emitting layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. 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 examples given herein without any inventive step, are within the scope of the present invention.
In the present invention, "top" means farthest from the substrate, and "bottom" means closest to the substrate. In the case where the first layer is described as being "disposed" over "the second layer, the first layer is disposed farther from the substrate. Other layers may be present between the first layer and the second layer, unless it is specified that the first layer is "in contact with" the second layer. For example, a cathode may be described as being "disposed over" an anode even though various organic layers are present between the cathode and the anode.
As used herein, the term "OLED element" includes an anode layer, a cathode layer, one or more organic layers disposed between the anode layer and the cathode layer. An "OLED element" can be bottom emitting, i.e. from the substrate side, or top emitting, i.e. from the encapsulation layer side, or a transparent element, i.e. from both the substrate and the encapsulation side.
As used herein, the term "OLED light emitting panel" includes a substrate, an anode layer, a cathode layer, one or more organic layers disposed between the anode layer and the cathode layer, an external light emitting layer disposed outside and in direct contact with the anode layer or the cathode layer, a protective layer, an encapsulation layer, and at least one anode contact and at least one cathode contact extending outside the encapsulation layer for external access. An "OLED light-emitting panel" has more substrates, external light-emitting layers, protective layers, encapsulation layers and electrical contacts than an "OLED element". The OLED light-emitting panel can comprise a plurality of OLED elements which can be independently packaged, can share the same packaging layer, can be lightened or extinguished at the same time, and can be selectively lightened or extinguished by simple metal connecting wires and external circuit control; an "OLED light-emitting panel" may also comprise only one single "OLED element", e.g. an "OLED light-emitting panel" comprising a plurality of "OLED elements" is cut such that each "OLED element" is individually controllable, in which case the "OLED light-emitting panel" comprises only one "OLED element".
As used herein, the term "flexible printed circuit" refers to any flexible substrate coated with any one or combination of the following, including but not limited to: conductive lines, resistors, capacitors, inductors, transistors, microelectromechanical systems, and the like. The flexible substrate of the flexible printed circuit may be plastic, thin glass, thin metal foil coated with an insulating layer, fabric, leather, paper, etc. A flexible printed circuit board is typically less than 1mm thick, more preferably less than 0.7mm thick.
As used herein, the term "light extraction layer" may refer to a light diffusing film, or other microstructure having light extraction effects, or a thin film coating having light outcoupling effects. The light extraction layer can be disposed on the substrate surface of the OLED, or can be in other suitable locations, such as between the substrate and the anode, or between the organic layer and the cathode, between the cathode and the encapsulation layer, on the surface of the encapsulation layer, and so forth.
As used herein, the term "externally electrically driven" refers to a system of devices that can power a module, which typically includes a circuit control system and an external power source. The circuit control system may include, but is not limited to, cathode and anode electrical contacts, wires, flexible printed circuit boards, integrated circuits, transformers, etc.; the external power supply can be various batteries directly, or can be a socket connected with alternating current, or a charger connected with a USB interface and other electronic equipment, or a power supply generator connected with the USB interface through a wire, and the like.
As used herein, the term "light-emitting region" refers to a portion of the planar area where the anode, organic layer and cathode coincide together, excluding light extraction effects. The "light emitting region" does not include edge light emission and does not represent a hemispherical light emitting space in three dimensions.
As used herein, "intrinsic peak wavelength" refers to the peak wavelength emitted by the light emitting layer material in a bottom emission element that includes at least a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. Under different matched material systems, the intrinsic peak wavelengths of the same luminescent material can have certain differences, but all should be within the range of +/-10 nm.
As used herein, "fill factor" refers to the ratio of the effective light-emitting area of a pixel to the total area.
As shown in fig. 1-5, which illustrate, without limitation, a single unit OLED light emitting device including two light emitting layers, as shown in fig. 1, the drawings are not necessarily to scale, and some of the layer structures may be omitted as desired. The OLED light emitting device includes a substrate 101, an anode layer 102, a hole injection layer 103, a hole transport layer 104, an electron blocking layer 105, a first organic light emitting layer 106, a hole blocking layer 107, an electron transport layer 108, an electron injection layer 109, a cathode layer 110, an external light emitting layer 111, and a protective layer 112. The electron blocking layer 105 and the hole blocking layer 107 are optional layers. The OLED light-emitting element of a single unit multi-luminescent layer may further comprise a regulating layer, generally having a thickness of not more than 100 angstroms, preferably not more than 50 angstroms, and further preferably not more than 30 angstroms, between the first luminescent organic layer 106 and the hole blocking layer 107. The adjusting layer is usually a hole blocking material or an electron blocking material, which limits the number of holes or electrons in different recombination regions and controls the light emitting ratio and intensity of the first organic light emitting layer 106. Nevertheless, the adjustment layer is not essential, and may be adjusted, for example, by matching the energy levels of the different layer materials. In the top-emitting device, further layers such as a light refraction layer or a capping layer may be further provided over the protective layer 112 as protection of the external light-emitting layer 111. The OLED light emitting device having a single multi-light emitting layer may further include a third light emitting layer 113 on the outer light emitting layer 111, as shown in the OLED light emitting device shown in fig. 5, and a regulating layer may be interposed between the outer light emitting layer 111 and the third light emitting layer 113. The light emitting materials of the adjusting layer can be selected according to actual needs, for example, the two light emitting layers shown in fig. 1 can be the blue first organic light emitting layer 106 and the blue external light emitting layer 111, respectively, and the three light emitting layers shown in fig. 5 can be the blue first organic light emitting layer 106, the green external light emitting layer 111, and the red third light emitting layer 113, respectively. When the injection current increases from small to large at both ends of the device, the exciton recombination region can gradually move from the electron transport end to the hole transport end, and the light intensity emitted by the first organic light emitting layer 106 changes. Taking fig. 1 as an example, at a low current density, the first organic light emitting layer 106 emits weak blue light to excite the external light emitting layer 111, the two light emitting layers emit light simultaneously, the peak intensity of the second spectrum in the element spectrum is much higher than that of the first spectrum, and the OLED light emitting device emits blue light. After the current density is increased, the first organic light emitting layer 106 and the external light emitting layer 111 emit light simultaneously, the first spectral peak intensity in the spectrum starts to increase and finally exceeds the second peak intensity to become the dominant wavelength, and the OLED light emitting device emits blue light. When the same light emitting material is used for the first organic light emitting layer 106 and the external light emitting layer 111, the same wavelength spectrum is emitted, which is advantageous in that black spots of the OLEDs can be prevented, and brightness and lifetime can be improved. In some embodiments, the first organic light emitting layer 106 may also be a green light emitting layer, and the external light emitting layer 106 or the third light emitting layer 113 may be a green or red light emitting layer. In some embodiments, the first organic light emitting layer 106 may also be a red light emitting layer, and the external light emitting layer 111 or the third light emitting layer 113 may be a red or near-infrared light emitting layer.
An organic electroluminescence device according to an embodiment of the present invention includes a substrate 101, an organic electroluminescence element disposed on the substrate, and an external electric drive, and further includes an external light emitting layer 111 disposed above the organic electroluminescence element and on the emission direction side of the organic electroluminescence element, and a protective layer 112 disposed above the external light emitting layer.
The organic electroluminescent element comprises an anode layer 102, a cathode layer 110 and at least one organic layer arranged between the anode layer and the cathode layer, the external electric drive being connected to the anode layer 102 and the cathode layer 110; the external light-emitting layer is in contact connection with the organic electroluminescent element, and the protective layer is in contact connection with the external light-emitting layer.
The present invention will be explained below specifically in terms of an OLED element integrated with an independent unit of an organic electroluminescent element and an external light emitting layer prepared, and the present invention will be described in more detail with reference to the following examples. It is apparent that the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Based on the following examples, a person skilled in the art will be able to modify them in order to obtain further embodiments of the invention.
Example 1
Blue light first organic light emitting layer and blue phosphorescent external light emitting layer device as an example
As shown in fig. 1, an organic electroluminescent device emitting blue light from the top was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate 101 was put into a glove box filled with nitrogen gas to be dried to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000081
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum was deposited as an anode layer 102 with a thickness of 100nm, and then molybdenum trioxide was sequentially deposited as a Hole Injection Layer (HIL)103 with a thickness of
Figure BDA0003373902930000082
A Hole Transport Layer (HTL)104,
Figure BDA0003373902930000083
an Electron Blocking Layer (EBL)105,
Figure BDA0003373902930000084
the first organic emission layer (EML)106 includes a blue host material doped with 10% of a blue light emitting material,
Figure BDA0003373902930000085
a Hole Blocking Layer (HBL)107,
Figure BDA0003373902930000086
the Electron Transport Layer (ETL)108 comprises LG201 doped with 60% LiQ, evaporated
Figure BDA0003373902930000087
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000088
The external light-emitting layer 111 contains a blue phosphorescent light-emitting material doped with 8% of a blue host material, and then the external light-emitting layer 111 is vapor-deposited with
Figure BDA0003373902930000089
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The blue light first organic light emitting layer 106 used in this embodiment has a first intrinsic peak wavelength of about 467nm and the blue phosphorescent outer light emitting layer 111 has a second intrinsic peak wavelength of about 470 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 2
Blue light first organic light emitting layer and TADF blue light external light emitting layer device are taken as examples
As shown in fig. 2, an organic electroluminescent device emitting blue light from the top was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate 101 was dried in a glove box filled with nitrogen gas to remove moisture, and then mounted on a rack and loaded into a vapor deposition chamberIn the chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000091
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 100nm, and then evaporated in sequence
Figure BDA0003373902930000092
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000093
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000094
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000095
The first organic light emitting layer (EML)106 comprises a blue host doped with 10% blue light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA0003373902930000096
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA0003373902930000097
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000098
The outer luminescent layer 111 comprises a blue host doped with 10% blue TADF luminescent material, followed by evaporation on the outer luminescent layer 111
Figure BDA0003373902930000099
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. Of the elementThe light emitting area was 9mm × 9 mm. The intrinsic peak wavelength of the blue first organic light emitting layer used in the embodiment is about 458nm, and the intrinsic peak wavelength of the blue external light emitting layer is about 460 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 3
Blue light first organic light emitting layer and orange light external light emitting layer device are taken as examples
As shown in fig. 2, an organic electroluminescent device emitting white light from the top was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate was dried in a glove box filled with nitrogen gas to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA00033739029300000910
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 100nm, and then evaporated in sequence
Figure BDA00033739029300000911
A Hole Injection Layer (HIL)103,
Figure BDA00033739029300000912
a Hole Transport Layer (HTL)104,
Figure BDA00033739029300000913
an Electron Blocking Layer (EBL)105,
Figure BDA00033739029300000914
the first organic light emitting layer (EML)106 comprises a blue host doped with 10% blue light emitting material, followed by evaporation on the first organic light emitting layer 160
Figure BDA00033739029300000915
The Electron Transport Layer (ETL)108 contained 60%LG201 of LiQ, vapor deposition
Figure BDA00033739029300000916
Is used as an Electron Injection Layer (EIL)109, and 100nm silver is evaporated as a semi-transparent cathode layer 110, and evaporation is continued
Figure BDA00033739029300000917
The external light-emitting layer 111 contains a yellow host material doped with 3% yellow light-emitting material, followed by evaporation on the external light-emitting layer 111
Figure BDA00033739029300001010
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the blue first organic light emitting layer 106 used in this embodiment is around 460nm, and the intrinsic peak wavelength of the yellow outer light emitting layer 111 is around 577 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 4
Blue light first organic light emitting layer and blue phosphorescent external light emitting layer device as an example
As shown in fig. 3, an organic electroluminescent device emitting blue light from the bottom was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate 101 was put into a glove box filled with nitrogen gas to be dried to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000101
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First of all, evaporation
Figure BDA0003373902930000102
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000103
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000104
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000105
The first organic light emitting layer (EML)106 comprises a blue host doped with 10% blue light emitting material, followed by evaporation on the first organic light emitting layer
Figure BDA0003373902930000106
Electron Transport Layer (ETL)108, vapor deposition
Figure BDA0003373902930000107
Is used as an Electron Injection Layer (EIL)109 and 150nm of aluminum is evaporated as a cathode layer 110, then the substrate is turned over and evaporation is continued
Figure BDA0003373902930000108
The outer light-emitting layer 111 contains a blue host doped with 8% blue light-emitting material, followed by vapor deposition on the outer light-emitting layer 111
Figure BDA0003373902930000109
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the blue first organic light emitting layer 106 used in this embodiment is around 468nm, and the intrinsic peak wavelength of the blue external light emitting layer 111 is around 470 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 5
Blue light first organic light emitting layer and green light external light emitting layer light emitting device are exemplified
As shown in FIG. 2, an organic electroluminescent device emitting green light from the top was prepared by first cleaning a glass substrate 101, on which Indium Tin Oxide (ITO) having a thickness of 120nm was previously patterned, with ultrapure water (A)ITO) anode layer 102 and the ITO surface treated with UV ozone and oxygen plasma. Thereafter, the substrate 101 was put into a glove box filled with nitrogen gas to be dried to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000111
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 100nm, and then evaporated in sequence
Figure BDA0003373902930000112
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000113
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000114
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000115
The first organic light emitting layer (EML)106 comprises a blue host doped with 5% blue light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA0003373902930000116
Electron transport layer 108(ETL)107 containing 50% LiQ of LG201, evaporated
Figure BDA0003373902930000117
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000118
The outer light-emitting layer 111 comprises a green host material doped with 5% green phosphorescent light-emitting material, followed by vapor deposition on the outer light-emitting layer 111
Figure BDA0003373902930000119
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the blue first organic light emitting layer 106 used in this embodiment is about 456nm, and the intrinsic peak wavelength of the blue external light emitting layer 111 is about 524 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 6
Light emitting device with blue light first organic light emitting layer and red light external light emitting layer as an example
As shown in fig. 2, an organic light emitting device of top emission red light was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water, and after treating the ITO surface with UV ozone and oxygen plasma, placing the substrate 101 in a glove box filled with nitrogen gas to dry to remove moisture, and then mounting on a holder and loading into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA00033739029300001110
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 100nm, and then evaporated in sequence
Figure BDA00033739029300001111
A Hole Injection Layer (HIL)103,
Figure BDA00033739029300001112
a Hole Transport Layer (HTL)104,
Figure BDA00033739029300001113
electron Blocking Layer (EBL)105, then
Figure BDA00033739029300001114
The first organic light emitting layer (EML)106 comprises a blue host doped with 8% blue light emitting material followed byVapor-plating on the first organic light-emitting layer 106
Figure BDA00033739029300001115
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA00033739029300001116
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA00033739029300001117
The outer light-emitting layer 111 comprises a red host material doped with 5% red phosphorescent light-emitting material, followed by vapor deposition on the outer light-emitting layer 111
Figure BDA0003373902930000121
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the blue first organic light emitting layer 106 and the intrinsic peak wavelength of the red external light emitting layer 111 used in this embodiment are around 458nm and around 620nm, respectively. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 7
Red first organic light emitting layer and near infrared external light emitting layer light emitting device as an example
As shown in fig. 2, an organic light emitting device emitting near-infrared light at the top was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was coated in advance, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate 101 was put into a glove box filled with nitrogen gas to be dried to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000122
The rate of one second is carried out on the ITO anode layer 102 by thermal evaporation in turnAnd (6) coating. First, aluminum is evaporated as an anode layer 102 with a thickness of 120nm, and then evaporated in sequence
Figure BDA0003373902930000123
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000124
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000125
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000126
The first organic light emitting layer (EML)106 comprises a red host doped with 5% red light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA0003373902930000127
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA0003373902930000128
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000129
The outer light-emitting layer 111 contains a red host material doped with 8% near-infrared light-emitting material, followed by vapor deposition on the outer light-emitting layer 111
Figure BDA00033739029300001210
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the red first organic light emitting layer 106 used in this example is around 620nm, and the intrinsic peak wavelength of the near infrared external light emitting layer 111 is around 705 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 8
Light emitting device with green light first organic light emitting layer and green light external light emitting layer as an example
As shown in fig. 2, an organic light emitting device of top emission green light was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate was dried in a glove box filled with nitrogen gas to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000131
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 120nm, and then evaporated in sequence
Figure BDA0003373902930000132
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000133
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000134
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000135
The first organic light emitting layer (EML)106 comprises a phosphorescent host material doped with 5% green phosphorescent light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA0003373902930000136
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA0003373902930000137
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000138
The external light-emitting layer 111 comprises a phosphorescent host material doped with 5% green phosphorescent light-emitting material, followed by vapor deposition on the external light-emitting layer 111
Figure BDA0003373902930000139
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The green light first organic light emitting layer 106 used in this embodiment has an intrinsic peak wavelength of about 524nm, and the green light outer light emitting layer 111 has an intrinsic peak wavelength of about 524 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 9
Red first organic light emitting layer and red external light emitting layer light emitting device are exemplified
As shown in fig. 2, an organic light emitting device of top emission red light was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate was dried in a glove box filled with nitrogen gas to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA00033739029300001310
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 120nm, and then evaporated in sequence
Figure BDA00033739029300001311
A Hole Injection Layer (HIL)103,
Figure BDA00033739029300001312
a Hole Transport Layer (HTL)104,
Figure BDA00033739029300001313
electron Blocking Layer (EBL)105, then
Figure BDA00033739029300001314
The first organic light emitting layer (EML)106 comprises a red host doped with 5% red light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA00033739029300001315
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA0003373902930000141
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000142
The outer light-emitting layer 111 contains a red host material doped with 5% red light-emitting material, followed by vapor deposition on the outer light-emitting layer 111
Figure BDA0003373902930000143
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the red first organic light emitting layer 106 used in this embodiment is around 620nm, and the intrinsic peak wavelength of the red external light emitting layer 111 is around 620 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 10
Light emitting device with green light first organic light emitting layer and red light external light emitting layer as an example
As shown in fig. 2, an organic light emitting device of top emission red light was prepared by first cleaning a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water and treating the ITO surface with UV ozone and oxygen plasma. Then, the substrate was dried in a glove box filled with nitrogen gas to dry
The water is removed and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000144
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 100nm, and then evaporated in sequence
Figure BDA0003373902930000145
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000146
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000147
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000148
The first organic light emitting layer (EML)106 comprises a green host material doped with 2% green light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA0003373902930000149
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA00033739029300001410
As an Electron Injection Layer (EIL)109 and 150nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA00033739029300001411
As the external light emitting layer 111, and then vapor-deposited on the external light emitting layer 111
Figure BDA00033739029300001412
Protective layer 112, and finally the device is transferred from the evaporation chamber back to the glove box and covered with a cover glassAnd packaging. The light emitting region of the element was 9mm × 9 mm. The green light first organic light emitting layer 106 intrinsic peak wavelength used in this example is around 519nm, and the red light outer light emitting layer 111 intrinsic peak wavelength is around 620 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Example 11
Blue light first organic light emitting layer and TADF blue light external light emitting layer light emitting device are taken as examples
As shown in fig. 2, an organic light emitting device of top-emission blue light was prepared by, first, washing a glass substrate 101, on which a patterned 120nm thick Indium Tin Oxide (ITO) anode layer 102 was previously coated, with ultrapure water, and treating the ITO surface with UV ozone and oxygen plasma. Thereafter, the substrate was dried in a glove box filled with nitrogen gas to remove moisture, and then mounted on a holder and loaded into an evaporation chamber. The layers specified below were evacuated to a vacuum of about 1X 10-6In the case of support with
Figure BDA0003373902930000151
The coating is sequentially performed on the ITO anode layer 102 by thermal evaporation at a rate of/sec. First, aluminum is evaporated as an anode layer 102 with a thickness of 120nm, and then evaporated in sequence
Figure BDA0003373902930000152
A Hole Injection Layer (HIL)103,
Figure BDA0003373902930000153
a Hole Transport Layer (HTL)104,
Figure BDA0003373902930000154
electron Blocking Layer (EBL)105, then
Figure BDA0003373902930000155
The first organic light emitting layer (EML)106 comprises a blue host doped with 10% blue light emitting material, followed by evaporation on the first organic light emitting layer 106
Figure BDA0003373902930000156
Electron Transport Layer (ETL)108 containing 50% LiQ of LG201, evaporated
Figure BDA0003373902930000157
As an Electron Injection Layer (EIL)109 and 120nm silver as a semi-transparent cathode layer 110, and then continuing to evaporate
Figure BDA0003373902930000158
As the outer luminescent layer 111, a blue TADF luminescent material is next vapor-deposited on the outer luminescent layer 111
Figure BDA0003373902930000159
Protective layer 112 and finally the device is transferred from the evaporation chamber back to the glove box and the encapsulation is completed with a cover glass. The light emitting region of the element was 9mm × 9 mm. The intrinsic peak wavelength of the blue first organic light emitting layer 106 used in this embodiment is around 458nm, and the intrinsic peak wavelength of the blue external light emitting layer 111 is around 458 nm. Note that this element structure is merely an example, and is not limited to the description of the present invention.
Comparative example 1
An organic electroluminescent device with top emission of blue light was fabricated, as shown in fig. 4, in the same manner as in example 1, except that the external light-emitting layer 111 and the protective layer 112 were not evaporated.
Test example 1
The experimental example used a Keithley2420 power generator connected to the cathode and anode electrical contacts of the OLED element itself to be electrically driven externally to form an organic electroluminescent device. The organic electroluminescent devices prepared in example 1 and comparative example 1 emitted spectra when the power generator provided the operating current density, and the element properties are shown in table 1.
TABLE 1
Figure BDA0003373902930000161
As can be seen from table 1, the present invention prepares a device having a separate unit multi-luminescent layer, integrates an organic electroluminescent element and an external luminescent layer, and realizes higher efficiency and lifetime. The organic electroluminescent element showed a great advantage as compared with comparative example 1, which is a single light-emitting layer.
The inventors also conducted the above-described experiments on the organic electroluminescent devices prepared in the other examples, and the results were substantially consistent and are not listed due to limited space.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. An organic electroluminescent device comprising a substrate, an organic electroluminescent element and an external electric drive, characterized by further comprising an external light-emitting layer and a protective layer, the organic electroluminescent element being disposed on the substrate, the external light-emitting layer being disposed above the organic electroluminescent element and on the side of the organic electroluminescent element in the emission direction, the protective layer being disposed above the external light-emitting layer.
2. An organic electroluminescent device according to claim 1, wherein the organic electroluminescent element comprises an anode layer, a cathode layer and at least one organic layer disposed between the anode layer and the cathode layer, the external electric drive being connected to the anode layer and the cathode layer, respectively;
preferably, the external light-emitting layer is in contact with the organic electroluminescent element, and the protective layer is in contact with the external light-emitting layer.
3. An organic electroluminescent device according to claim 1 or 2, wherein the organic electroluminescent element emits a first intrinsic peak wavelength and the outer light-emitting layer emits a second intrinsic peak wavelength.
4. An organic electroluminescent device according to claim 3, wherein when the external electric drive supplies an operating current density to the organic electroluminescent element, the organic electroluminescent element is capable of emitting a first spectrum and generating a first luminescent region, the first spectrum includes a first intrinsic peak wavelength, the first spectrum excites the external luminescent layer to emit a second spectrum and generates a second luminescent region, the second spectrum includes a second intrinsic peak wavelength, a ratio of peak intensities of the first intrinsic peak wavelength and the second intrinsic peak wavelength is not higher than 1, and the first luminescent region and the second luminescent region coincide with each other.
5. The organic electroluminescent device according to claim 4, wherein the first intrinsic peak wavelength is 380 to 620nm, and the second intrinsic peak wavelength is greater than 460nm and equal to or less than 1000 nm.
6. The device as claimed in claim 5, wherein the second intrinsic peak wavelength is 460-800 nm.
7. An organic electroluminescent device according to claim 3, wherein when the external electric drive provides an operating current density to the organic electroluminescent element, the organic electroluminescent element is capable of emitting a first spectrum that excites the external light-emitting layer to emit a second spectrum that includes a first intrinsic peak wavelength and a second intrinsic peak wavelength, and a ratio of a peak intensity of the second intrinsic peak wavelength to a peak intensity of the first intrinsic peak wavelength is greater than 1.5.
8. An organic electroluminescent device according to claim 1, wherein the external electric drive is a display panel backplane circuit or a lighting panel backplane circuit.
9. A display device comprising the organic electroluminescent device according to any one of claims 1 to 8.
10. A lighting device comprising the organic electroluminescent device according to any one of claims 1 to 8.
CN202111411202.1A 2021-11-25 2021-11-25 Organic electroluminescent device, display device and lighting device Pending CN114122098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111411202.1A CN114122098A (en) 2021-11-25 2021-11-25 Organic electroluminescent device, display device and lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111411202.1A CN114122098A (en) 2021-11-25 2021-11-25 Organic electroluminescent device, display device and lighting device

Publications (1)

Publication Number Publication Date
CN114122098A true CN114122098A (en) 2022-03-01

Family

ID=80372836

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111411202.1A Pending CN114122098A (en) 2021-11-25 2021-11-25 Organic electroluminescent device, display device and lighting device

Country Status (1)

Country Link
CN (1) CN114122098A (en)

Similar Documents

Publication Publication Date Title
US11507649B2 (en) Optical fingerprint authentication device
JP5889730B2 (en) Organic electroluminescent device and lighting device
EP2182563B1 (en) Organic light-emitting diode device and manufacturing method thereof
JP2007502534A (en) Circuit arrangement for organic diode AC drive
JP5991686B1 (en) Organic electroluminescent device and lighting device
US10084146B2 (en) Organic electroluminescent element and lighting device
JP2007011063A (en) Organic electroluminescence display device
JP5735162B1 (en) Organic electroluminescent device and lighting device
KR101513443B1 (en) Light source device on a printed circuit board and light source arrangement comprising a plurality of light source devices
JP2007531297A (en) Electroluminescent device interlayer and electroluminescent device
CN110291844B (en) Organic electroluminescent device, display device and lighting device
JP5857006B2 (en) Organic electroluminescent device and lighting device
CN110352628B (en) Organic electroluminescent device and lighting device
CN110115108B (en) Organic electroluminescent device and lighting apparatus
CN114122098A (en) Organic electroluminescent device, display device and lighting device
JP6022015B2 (en) Organic electroluminescent device and lighting device
CN110140427B (en) Organic electroluminescent device and lighting apparatus
CN211295150U (en) Organic electroluminescent device
JP4893816B2 (en) OPTICAL SUBSTRATE, LIGHT EMITTING ELEMENT, DISPLAY DEVICE AND METHOD FOR PRODUCING THEM
CN112186114B (en) Organic electroluminescent device
JP2019102461A (en) OLED panel for lighting device and method of manufacturing the same
CN111081891A (en) Organic electroluminescent device
KR100866359B1 (en) White organic light-emitting diodes
EP3258747B1 (en) Organic electroluminescent element and lighting device
JP2019145474A (en) Organic electroluminescent element, display device and lighting device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination