CN114447245B - Organic electroluminescent device and display equipment - Google Patents
Organic electroluminescent device and display equipment Download PDFInfo
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Abstract
The application is applicable to the field of photoelectric technology, and provides an organic electroluminescent device and display equipment, wherein the organic electroluminescent device comprises a light-emitting auxiliary layer and a light-emitting layer, and the light-emitting auxiliary layer is represented by a formula I: the light-emitting layer is composed of a compound represented by formula II: And formula III:
Description
Technical Field
The application belongs to the technical field of photoelectricity, and particularly relates to an organic electroluminescent device and display equipment.
Background
An organic electroluminescent display (OLED) is an active light emitting display device, and is expected to be one of the most interesting technologies among the current flat panel display technologies, since it has advantages of simple manufacturing process, low cost, high contrast, wide viewing angle, low power consumption, etc., following CRT (cathode ray tube) displays, LCD (liquid crystal display), PDP (plasma display) flat panel displays. At present, the OLED display screen with medium and small size has been applied to high-end smart phones manufactured by companies such as Hua Cheng, xiao Miao, sanxing and the like in a large scale, and the market feedback effect is excellent.
In the existing OLED display device, the on-luminance voltages of RGB three-color subpixels are not uniform. Specifically, the turn-on voltages of the blue sub-pixel, the green sub-pixel and the red sub-pixel are sequentially decreased. In practical application, the blue photon pixels have larger efficiency difference under different driving voltage conditions. The blue photon pixel has lower luminous efficiency under the low voltage driving. However, the driving voltages of the red sub-pixel and the green sub-pixel are relatively low, and the red sub-pixel and the green sub-pixel can emit light normally under the low-voltage driving, so that the luminous efficiency of the red sub-pixel is higher than that of the green sub-pixel and the blue sub-pixel under the low-gray-scale condition, and the color development and reddening phenomenon and the crosstalk phenomenon occur on the screen body.
Generally, increasing the turn-on voltage of the red light device can alleviate the color-shift red phenomenon caused by crosstalk, and in specific applications, the turn-on voltage of the single-body red light device is higher than that of the double-body red light device, but the luminous efficiency and the service life are not as good as those of the double-body red light device, and increasing the turn-on voltage of the double-body red light device usually involves a problem of increasing the driving voltage.
Disclosure of Invention
An object of the embodiment of the application is to provide an organic electroluminescent device, which aims to solve the technical problem that the driving voltage is increased along with the increase of the starting voltage of a double-body red light device in the prior art.
The embodiment of the application is realized in that the organic electroluminescent device comprises a luminescent auxiliary layer and a luminescent layer,
Wherein the light-emitting auxiliary layer is composed of a compound represented by formula I:
in formula I: ar' 1,Ar'2 each independently represents one of a substituted or unsubstituted C 6～C24 aryl group, a substituted or unsubstituted 3-to 24-membered heteroaryl group;
Each R' 1-R'3 independently represents one of hydrogen, deuterium, substituted or unsubstituted C 1～C6 alkyl, substituted or unsubstituted C 6～C18 aryl, substituted or unsubstituted 3-to 18-membered heteroaryl, substituted or unsubstituted C 3～C12 cycloalkyl, substituted or unsubstituted C 1～C6 alkoxy;
R' 4 is one of hydrogen, methyl, ethyl, phenyl, biphenyl;
the host material of the light-emitting layer comprises a compound shown in a formula II and a compound shown in a formula III:
In formula II: l 1 represents one of a bond, a substituted or unsubstituted C 6～C18 arylene, a substituted or unsubstituted ternary to eighteen membered heteroarylene;
Ring A, ar 1-Ar2 each independently represents one of a substituted or unsubstituted C 6～C24 aryl group, a substituted or unsubstituted 3-to 24-membered heteroaryl group;
R 1 represents one of hydrogen, deuterium, substituted or unsubstituted C 1～C6 alkyl, substituted or unsubstituted C 6～C18 aryl, substituted or unsubstituted 3-to 18-membered heteroaryl, substituted or unsubstituted C 3～C6 cycloalkyl, substituted or unsubstituted C 1～C6 alkoxy;
In formula III: x 1～X3 is one of N or C, and at least one of them is N;
y 1、Y2 is one of N, S or O, and one and only one of Y 1 and Y 2 is N;
L 2 represents one of a bond, a substituted or unsubstituted C 6～C18 arylene, a substituted or unsubstituted 3-to 18-membered heteroarylene;
Ar 3-Ar5 each independently represents one of a substituted or unsubstituted C 6～C24 aryl group, a substituted or unsubstituted 3-to 24-membered heteroaryl group.
Another object of an embodiment of the present application is to provide a display apparatus including the organic electroluminescent device as described in the above object.
The organic electroluminescent device provided by the embodiment of the application provides a material combination composed of a luminescent auxiliary layer material and a specific double-body red light material, has lower driving voltage on the premise of relieving the red light crosstalk problem of the display device by improving the starting voltage, and simultaneously retains the advantages of high efficiency and long service life of the double-body material luminescent device.
Drawings
Fig. 1 is a graph of luminance versus voltage for example 3 and comparative example 1 in the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The organic electroluminescent device generally includes a first electrode, a second electrode facing the first electrode, a light emitting layer between the first electrode and the second electrode, and a hole transporting region between the first electrode and the light emitting layer; the hole transport region generally includes a layer such as a hole injection layer, a hole transport layer, and a light emitting auxiliary layer. The materials used for the layers can be matched through selection.
One of the embodiments of the present application is:
the material of the light-emitting auxiliary layer is composed of a compound shown in a formula I:
in formula I: ar' 1,Ar'2 each independently represents one of a substituted or unsubstituted C 6～C24 aryl group, a substituted or unsubstituted 3-to 24-membered heteroaryl group;
Each R' 1-R'3 independently represents one of hydrogen, deuterium, substituted or unsubstituted C 1～C6 alkyl, substituted or unsubstituted C 6～C18 aryl, substituted or unsubstituted 3-to 18-membered heteroaryl, substituted or unsubstituted C 3～C12 cycloalkyl, substituted or unsubstituted C 1～C6 alkoxy;
R' 4 is one of hydrogen, methyl, ethyl, phenyl, biphenyl;
r' 1-R'4 is connected with the benzene ring in a way of substituting or forming a condensed ring;
further, the compound represented by formula I is one of the following compounds:
Wherein R' 1-R'2 is selected from hydrogen, deuterium, methyl, ethyl, isopropyl, propyl, tert-butyl, phenyl, naphthyl, biphenyl, pyridyl, methoxy, phenanthryl, dibenzofuranyl, dimethylfluorenyl;
R' 3 is selected from deuterium, methyl, ethyl, propyl, isopropyl, tert-butyl, phenyl, naphthyl, biphenyl, pyridyl, methoxy, phenanthryl, dimethylfluorenyl, furyl;
Ar '1 and Ar' 2 are linked to N at any substitutable position;
Ar' 1,Ar'2 are each independently selected from one of the following groups:
further, the compound represented by formula I may be specifically exemplified by, but not limited to, the following compound HT-1-HT-56.
The main material of the light-emitting layer is a red light double-main material, and is composed of a compound shown in a formula II and a formula III:
In formula II: l 1 represents one of a bond, a substituted or unsubstituted C 6～C18 arylene, a substituted or unsubstituted 3-to 18-membered heteroarylene;
Ring A, ar 1-Ar2 each independently represents one of a substituted or unsubstituted C 6～C24 aryl group, a substituted or unsubstituted 3-to 24-membered heteroaryl group;
R 1 represents one of hydrogen, deuterium, substituted or unsubstituted C 1～C6 alkyl, substituted or unsubstituted C 6～C18 aryl, substituted or unsubstituted 3-to 24-membered heteroaryl, substituted or unsubstituted C 3～C6 cycloalkyl, substituted or unsubstituted C 1～C6 alkoxy;
r 1 is connected with the benzene ring in a way of substituting or forming a condensed ring;
Further, ring a is selected from hydrogen, phenyl, naphthyl;
R 1 is selected from hydrogen, deuterium, methyl, ethyl, isopropyl, tert-butyl, phenyl, naphthyl, phenanthryl, biphenyl, terphenyl, pyridyl, pyrimidinyl, triazinyl, furyl, thienyl, fluorenyl, benzofuranyl, benzothienyl, methoxy;
L 1 is selected from the group consisting of a bond, phenyl, naphthyl, biphenyl, pyridyl, phenanthryl, dibenzofuranyl, dibenzothienyl, and dimethylfluorenyl;
ar 1,Ar2 is selected from phenyl, methylphenyl, naphthyl, biphenyl, pyridyl, phenanthryl, dibenzofuranyl, dibenzothienyl, dimethylfluorenyl and carbazolyl;
In formula III: x 1～X3 is one of N or C, and at least one of them is N;
y 1、Y2 is one of N, S or O, and one and only one of Y 1 and Y 2 is N;
L 2 represents one of a bond, a substituted or unsubstituted C 6～C18 arylene, a substituted or unsubstituted 3-to 18-membered heteroarylene;
Ar 3-Ar5 each independently represents one of a substituted or unsubstituted C 6～C24 aryl group, a substituted or unsubstituted 3-to 24-membered heteroaryl group.
Further, the compound represented by formula II is one of the following compounds:
Wherein formula II-a is one of the following formulas II-a-1 to II-a-4, and formula II-b is one of the following formulas II-b-1 to II-b-4:
further, the compound represented by formula II may be specifically exemplified by, but not limited to, the following compounds RH1-1-RH 1-56:
Further, the compound represented by formula III is one of the following compounds:
Wherein L 2 represents one of a bond, phenyl, naphthyl, biphenyl, pyridyl, phenanthryl, dibenzofuranyl, dibenzothienyl, dimethylfluorenyl;
Ar 3-Ar5 each independently represents one of phenyl, methylphenyl, naphthyl, biphenyl, pyridyl, phenanthryl, dibenzofuranyl, dibenzothienyl, dimethylfluorenyl and carbazolyl.
The compound represented by formula III may be specifically exemplified by, but not limited to, the following compounds RH2-1-RH 2-76:
The light-emitting layer generally contains a doping material in addition to the host material, and the doping material in the present application is selected from red light doping materials, and there are aromatic amine derivatives, styrylamine compounds, boron complexes, fluoranthene compounds, metal complexes, and the like. In the case of processing an organic electroluminescent device, particularly a light-emitting layer, a host material and a dopant material can be combined by a physical vapor deposition method such as sputtering or electron beam evaporation. Specifically, the red light doped material of the present application is selected from the following compounds, but is not limited thereto.
The compounds of formula I described in the present application can be produced by reference to the following reaction scheme:
under the protection of N 2, respectively adding reactant A, reactant B, tetra (triphenylphosphine) palladium and potassium carbonate into a mixed solvent of toluene, ethanol and water in a reaction container, heating to 105 ℃, reacting for 8 hours, cooling to room temperature after the reaction is finished, filtering after the solid is separated out, and drying a filter cake. Placing in 1, 4-dioxane for recrystallization to obtain the formula I.
The compounds of formula II described in the present application can be produced by reference to the following reaction scheme:
After adding reactant C and reactant D to the reaction vessel and dissolving in toluene under N 2, pd 2(dba)3、P(t-Bu)3, t-Buona were added. After the addition, the temperature was raised to 110℃and the reaction was carried out for 8 hours. The mixture was filtered with celite and the catalyst was removed by suction while hot, the filtrate was cooled to room temperature, the solvent was removed by rotary evaporator, and the resulting solid was dried and passed through a silica funnel with dichloromethane: the petroleum ether volume ratio is 1 (1-4) as eluent, the filtrate is removed by a rotary evaporator, and the obtained solid is dried to obtain the formula II.
The compounds of formula III described in the present application can be produced by reference to the following reaction scheme:
Under the protection of N 2, respectively adding reactant E, reactant F, tetra (triphenylphosphine) palladium and potassium carbonate into a mixed solvent of toluene, ethanol and water in a reaction container, heating to 105 ℃, reacting for 8 hours, cooling to room temperature after the reaction is finished, filtering after the solid is separated out, and drying a filter cake. Placing in 1, 4-dioxane for recrystallization to obtain the formula III.
It should be noted that the compounds of formula I, formula II, and formula III in the present application may be synthesized according to various routes in the prior art, and are not limited to the above synthetic routes.
The organic electroluminescent device is described below as the other constituent layers except the light-emitting auxiliary layer and the light-emitting layer:
In general, an organic electroluminescent device may have a structure including a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting auxiliary layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and the like as an organic layer. The structure of the organic electroluminescent device is not limited thereto and may include a smaller or larger number of organic layers.
The organic electroluminescent device may be manufactured by sequentially stacking a first electrode, an organic layer, and a second electrode on a substrate. The product can be produced by a physical vapor deposition method such as sputtering or electron beam evaporation.
A first electrode is formed by vapor deposition of a metal or a metal oxide having conductivity or an alloy thereof on a substrate, an organic layer including a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer is formed on the first electrode, and then a substance usable as a second electrode is vapor deposited on the organic layer. In addition to such a method, the second electrode material, the organic layer, and the first electrode material may be sequentially deposited on the substrate to manufacture the organic light-emitting element.
In addition, the compounds represented by the formulas I, II, and III may be used not only in the vacuum vapor deposition method but also in the solution coating method to form the organic layer when the organic light-emitting element is manufactured. The solution coating method is, but not limited to, spin coating, dip coating, blade coating, ink jet printing, screen printing, spray coating, roll coating, and the like.
The first electrode of the present application is preferably an anode and the second electrode is preferably a cathode.
As the anode material, a material having a large work function is generally preferable in order to allow holes to be smoothly injected into the organic layer. Specific examples of the anode material that can be used in the present application include metals such as vanadium, chromium, copper, zinc, and gold, and alloys thereof; metal oxides such as zinc oxide, indium Tin Oxide (ITO), and Indium Zinc Oxide (IZO); a combination of metals such as ZnO A1 or SnO 2 and Sb and oxides; and conductive polymers such as polypyrrole and polyaniline.
As the cathode material, a material having a small work function is generally preferred in order to facilitate injection of electrons into the organic layer. Specific examples of the cathode material include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead, and alloys thereof: liF/A1, liO 2/A1, mg/Ag, and other multilayer structural materials.
The hole transport region means a region in which holes are transported between the first electrode and the light emitting layer. The hole transport region is a region that receives holes from the hole injection layer and transports the holes to the light emitting layer. The hole transport region may be placed between the anode (or hole injection layer) and the light emitting layer. The hole transport region may serve to smoothly move holes transferred from the anode to the light emitting layer and block electrons transferred from the cathode to remain in the light emitting layer.
In the present application, the hole injection layer is preferably a p-doped hole injection layer, which means a hole injection layer doped with a p-dopant. A p-dopant is a material capable of imparting p-type semiconductor characteristics. The p-type semiconductor property means a property of injecting holes or transporting holes at the HOMO level, that is, a property of a material having high hole conductivity.
In the present application, the light-emitting auxiliary layer is preferably placed between the anode and the light-emitting layer, or between the cathode and the light-emitting layer. When the light-emitting auxiliary layer is placed between the anode and the light-emitting layer, it may be used to promote hole injection and/or hole transport, or to prevent electron overflow. When the light-emitting auxiliary layer is placed between the cathode and the light-emitting layer, it may be used to promote electron injection and/or electron transport, or to prevent hole overflow.
The light-emitting substance of the light-emitting layer is a substance capable of receiving and binding holes and electrons from the hole-transporting layer and the electron-transporting layer, respectively, to emit light in the visible light region, and is preferably a substance having high quantum efficiency for fluorescence or phosphorescence.
The electron transport region may include at least one of an electron buffer layer, a hole blocking layer, an electron transport layer, and an electron injection layer, and preferably at least one of an electron transport layer and an electron injection layer. The electron transport region is a layer capable of improving a problem of deterioration of light emission luminance due to a change in current characteristics in the device when the device is exposed to high temperature during a process of manufacturing a panel, and it can control charge flow characteristics.
The materials of the other layers in the organic electroluminescent device are not particularly limited except that the disclosed light-emitting auxiliary layer contains a specific combination of formula I and formula II and formula III in the light-emitting layer. Existing hole injection materials, hole transport materials, dopant materials, hole blocking layer materials, electron transport layer materials, and electron injection materials may be used.
Examples of the material for the hole injection layer include metalloporphyrin, oligothiophene, arylamine derivative, hexanitrile hexaazabenzophenanthrene organic material, quinacridone organic material, perylene organic material, anthraquinone, polyaniline, and polythiophene conductive polymer, and the P-doped P-dopant can be exemplified by, but not limited to, the following compounds.
The hole transport layer material may be selected from arylamine derivatives, conductive polymers, block copolymers having both conjugated and non-conjugated portions, and the like, and specifically, the hole transport layer material is selected from the following compounds, but is not limited thereto.
The material of the electron transport layer (hole blocking layer), such as oxazole, imidazole, thiazole, triazine, metal chelate, quinoline derivative, quinoxaline derivative, diazoanthracene derivative, phenanthroline derivative, silicon-containing heterocyclic compound, perfluorinated oligomer, etc., is specifically selected from the following compounds, but is not limited thereto.
Examples of the electron injection layer material include fluorenone, anthraquinone dimethane, dibenzoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylene tetracarboxylic acid, fluorenylmethane, anthrone, and the like, and derivatives, metal complexes, nitrogen-containing 5-membered ring derivatives, and the like thereof, but are not limited thereto.
Another embodiment of the present application is to provide a display device including an organic electroluminescent device employing the light-emitting auxiliary layer and the light-emitting layer material of the present application. The display device can be a display device adopting an organic electroluminescence technology, such as a television, a computer display, a mobile phone display screen component, an outdoor electronic large screen and the like, and is not limited to the types of the devices. The display equipment adopting the organic electroluminescent device disclosed in the embodiment can effectively avoid the red light crosstalk phenomenon, has lower driving voltage, effectively avoids breakdown and has long service life.
The organic electroluminescent device provided by the application is specifically described below with reference to specific embodiments. It should be noted that the preparation of the organic electroluminescent device provided by the present application may be implemented by using the prior art, and the following method steps may be referred to but the preparation method is not limited thereto.
Examples 1 to 7 the organic electroluminescent devices corresponding to comparative examples 1 to 6 were prepared by following steps, and the abbreviations of the partial names of the substances involved in the steps and the corresponding relations of the structural formulae are shown in Table 1:
a. ITO anode: washing an ITO (indium tin oxide) -Ag-ITO (indium tin oxide) glass substrate with the coating thickness of 150nm in distilled water for 2 times, washing by ultrasonic waves for 30min, repeatedly washing by distilled water for 2 times, washing by ultrasonic waves for 10min, transferring into a spin dryer for spin drying after washing, baking for 2 hours at 220 ℃ by a vacuum oven, and cooling after baking is finished, so that the glass substrate can be used. Using the substrate as an anode, and using an evaporator to perform an evaporation device process, and evaporating other functional layers on the substrate in sequence;
b. HIL (hole injection layer): to be used for The vacuum evaporation hole injection layer materials HT1-7 and P-9 have the chemical formulas shown below. The evaporation rate ratio of HT1-7 to P-9 is 97:3, the thickness is 10nm;
c. HTL (hole transport layer): to be used for Vacuum evaporating 125nm HT1-7 on the hole injection layer as a hole transport layer;
d. Light-emitting auxiliary layer: to be used for The compound shown in the formula I provided by the application is used as a light-emitting auxiliary layer, wherein the evaporation rate is 90 nm;
e. EML (light emitting layer): then on the light-emitting auxiliary layer to The host material and the doping material (Dopant-R-2) shown in the formula II and the formula III with the total thickness of 40nm are vacuum evaporated as the light-emitting layer, wherein the evaporation rate ratio of the host material formula II and the formula III is 4:6, and the evaporation rate ratio of the host material and the doping material is 97:3, a step of;
f. HBL (hole blocking layer): to be used for Vacuum evaporating a hole blocking layer ET-11 with the thickness of 5.0 nm;
g. ETL (electron transport layer): to be used for ET-4 and Liq with a thickness of 30nm were vacuum evaporated as electron transport layers. Wherein the ratio of the evaporation rates of ET-4 and Liq is 1:1, a step of;
h. EIL (electron injection layer): to be used for Evaporating Yb film layer with a thickness of 1.0nm to form an electron injection layer;
i. And (3) cathode: to be used for The vapor deposition rate ratio of magnesium and silver is 18nm, and the vapor deposition rate ratio is 1:9, so that a cathode is formed;
j. light extraction layer: to be used for CPL with the thickness of 70nm is vacuum deposited on the cathode to be used as a light extraction layer;
k. and packaging the substrate subjected to evaporation. Firstly, a gluing device is adopted to carry out a coating process on a cleaned cover plate by UV glue, then the coated cover plate is moved to a lamination working section, a substrate subjected to vapor deposition is placed at the upper end of the cover plate, and finally the substrate and the cover plate are bonded under the action of a bonding device, and meanwhile, the UV glue is cured by illumination.
The structure of the organic electroluminescent device is as follows:
ITO/Ag/ITO/HT1-7:P-9 (10 nm)/HT 1-7 (125 nm)/formula I (90 nm)/(formula II+formula III): dopant-R-2 (40 nm)/ET-11 (5 nm)/ET-4:Liq (30 nm)/Yb (1 nm)/Mg: ag (18 nm)/CPL (70 nm).
Table 1: the corresponding relation table of the material name abbreviations and structural formulas of the materials of the parts required by the layers
Examples 1 to 6
The organic electroluminescent devices of examples 1 to 6 were prepared according to the above-described preparation method of the organic electroluminescent device, using the compounds RH1 to 22 and RH2 to 8 shown in Table 1 as host materials, and HT-5, HT-10, HT-13, HT-24, HT-26, and HT-40 as light emitting auxiliary layer materials of examples 1 to 6, respectively, in this order.
Example 7
The organic electroluminescent device of example 7 was prepared according to the above-described method for preparing an organic electroluminescent device, using the compounds RH1-3 and RH2-10 shown in Table 1 as host materials and HT-13 as light emitting auxiliary layer materials.
Comparative examples 1 to 3
Organic electroluminescent devices of comparative examples 1 to 3 were prepared according to the above-described preparation method of organic electroluminescent device, using the compounds RH1 to 22 and RH2 to 8 shown in table 1 as host materials, and the comparative compounds 1 to 3 as light-emitting auxiliary layer materials of comparative examples 1 to 3, respectively, in sequence.
Comparative examples 4 to 6
Organic electroluminescent devices of comparative examples 4 to 6 were prepared according to the above-described preparation method of organic electroluminescent device, using the compounds RH1 to 3 and RH2 to 10 shown in table 1 as host materials, and the comparative compounds 1 to 3 were used as light-emitting auxiliary layer materials of comparative examples 4 to 6, respectively, in order.
The organic electroluminescent devices obtained in the above device examples 1 to 7 and device comparative examples 1 to 6 were characterized for driving voltage and luminance starting voltage at 6000cd/m 2 luminance, and the test results are shown in the following table 2:
Table 2 test results (brightness 6000cd/m 2)
Fig. 1 of the present application shows luminance-voltage curves corresponding to two sets of data of comparative example 1 in example 3 of table 2, wherein voltage values indicated by abscissas of corresponding points on the two curves are on-luminance voltages, and voltage values indicated by abscissas of corresponding points are driving voltages, when the abscissas are 1cd/m 2, and when the abscissas are 6000cd/m 2.
As can be seen from the values of the starting voltage and the driving voltage obtained in table 2, the organic electroluminescent device prepared by including the specific arylamine derivative of the formula I of the present application in the hole transport region and the specific combination of the bi-host red light material of the formula II of the present application of the formula III in the light emitting layer can increase the starting voltage and maintain the lower driving voltage.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (8)
1. An organic electroluminescent device, characterized in that: comprises a light-emitting auxiliary layer and a light-emitting layer, wherein the light-emitting auxiliary layer is composed of a compound shown as a formula I:
r' 1、R'2 each independently represents one of hydrogen, deuterium, methyl, ethyl, isopropyl, propyl, tert-butyl;
r' 3 represents one of hydrogen, deuterium, methyl, ethyl, propyl, isopropyl, tert-butyl, phenyl;
Ar '1 and Ar' 2 are linked to N at any substitutable position;
ar' 1,Ar'2 each independently represents one of the following groups:
r' 4 is one of hydrogen, methyl, ethyl and phenyl;
The main material of the light-emitting layer comprises a compound shown as a formula II-a and a compound shown as a formula III:
Wherein:
ring A represents one of hydrogen, phenyl and naphthyl;
R 1 represents one of hydrogen, deuterium, methyl, ethyl, isopropyl and tert-butyl;
l 1 represents phenyl;
Ar 1,Ar2 each independently represents one of phenyl, methylphenyl, naphthyl, biphenyl, pyridyl, phenanthryl, dibenzofuranyl, dibenzothienyl, dimethylfluorenyl, and carbazolyl;
X 1～X3 is N;
y 1、Y2 is one of N, S or O, and one and only one of Y 1 and Y 2 is N;
l 2 represents a bond;
Ar 3-Ar5 each independently represents one of phenyl, methylphenyl, naphthyl, biphenyl, pyridyl, phenanthryl, dibenzofuranyl, dibenzothienyl, dimethylfluorenyl and carbazolyl.
2. The organic electroluminescent device of claim 1, wherein the compound of formula I is one of the following compounds:
3. The organic electroluminescent device of claim 1, wherein the compound represented by formula I is one of the following compounds:
4. the organic electroluminescent device according to claim 1, wherein the compound represented by formula II-a is one of the following compounds represented by formulas II-a-1 to II-a-4:
5. An organic electroluminescent device as claimed in any one of claims 1to 3, characterized in that the compound represented by formula II-a is one of the following compounds:
6. An organic electroluminescent device as claimed in any one of claims 1 to 3, wherein the compound represented by formula III is one of the following compounds:
7. An organic electroluminescent device as claimed in any one of claims 1 to 3, characterized in that the compound represented by formula III is one of the following compounds:
8. a display device, characterized in that the display device comprises the organic electroluminescent device as claimed in any one of claims 1 to 3.
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