Blue light-emitting main body composition, organic light-emitting device comprising same, display panel and display device

Abstract

The invention discloses a blue light-emitting main body composition, and an organic electroluminescent device, a display panel and a display device comprising the same. The blue light-emitting main body composition comprises a first component and a second component, the structural general formula of the first component is shown as a formula I, and the structural general formula of the second component is shown as a formula II; ar1 is selected from deuterated or unsubstituted phenyl or naphthyl; l is selected from deuterated or non-deuterated phenyl; and Ar22 is a deuterated structure of Ar21. In the invention, the compound in the formula I containing the deuterated anthracene nucleus and the non-deuterated Ar21 group is combined with the compound in the formula II containing the non-deuterated anthracene nucleus and the deuterated Ar22 group in a differentiated manner, so that the carrier balance of the organic electroluminescent device can be further adjusted, the efficiency of the organic electroluminescent device is improved, and the service life of the organic electroluminescent device is prolonged. # imgabs0 #

Description

Technical Field

[0001] The present invention belongs to the technical field of OLED, and specifically comprises a blue light-emitting main body composition and an organic electroluminescent device, a display panel and a display device comprising the same. Background Art

[0002] After more than two decades of rapid development, organic electroluminescent devices (OLEDs), as a new generation of flat panel display devices, have shown obvious advantages and have gradually been recognized by people. They are ultra-thin, colorful, short response time, wide color gamut, high contrast, and can provide highly saturated red, green, and blue colors. They have been widely used in flat panel displays, flexible displays, solid-state lighting, and automotive displays.

[0003] In current organic electroluminescent devices, deuterium substitution technology has been widely used in materials of the blue light system to improve material performance. Studies have found that using deuterium atoms instead of hydrogen atoms can increase the dissociation energy of the material, improve the stability of the material, and reduce the reaction rate of the material degradation process, thereby achieving the purpose of improving the life of the organic electroluminescent device. However, while deuterium substitution reduces the aging rate, it will also have a certain impact on other properties of the material, such as reducing the carrier transfer rate of the material. In addition, compositions are often used in the film layer of the organic electroluminescent device. For example, the hole injection layer is usually formed by co-evaporation of the hole transport material and the P-type doping material, and the light-emitting layer is formed by co-evaporation of one or more host materials and guest materials. When the light-emitting layer of the organic electroluminescent device uses a variety of host materials, when the structures of the multiple components used are too different, it may lead to different evaporation rates, which in turn leads to poor film formation, and the device efficiency and life are negatively affected. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention provides a blue light-emitting host composition and an organic electroluminescent device, a display panel and a display apparatus comprising the same.

[0005] To achieve the above objectives, the technical solutions adopted by the present invention include:

[0006] The first aspect of the present invention provides a blue light-emitting host composition, which comprises a first component and a second component, wherein the general structural formula of the first component is shown in Formula I, and the general structural formula of the second component is shown in Formula II:

[0007]

[0008] Ar1 is selected from deuterated or unsubstituted phenyl or naphthyl;

[0009] L is selected from deuterated or non-deuterated phenyl;

[0010] The Ar21 Select one of the following structures:

[0011]

[0012] The Ar 22 Ar 21 deuterated structure.

[0013] It should be noted that Ar2 is a structure in which all hydrogen atoms in Ar1 are replaced by deuterium atoms, that is, Ar 21 with Ar 22 have the same backbone fragments and Ar 21 The attachment site to the deuterated anthracene group of the parent nucleus is Ar 22 The attachment site to the parent nucleus anthracene group is the same. 21 Selected from When Ar 22 Selected from Furthermore, the Ar 21 Select one of the following structures:

[0014]

[0015]

[0016] Furthermore, the Ar 22 Select one of the following structures:

[0017]

[0018]

[0019] Furthermore, the first component is selected from one of the following structures:

[0020]

[0021]

[0022]

[0023] Furthermore, the second component is selected from one of the following structures:

[0024]

[0025]

[0026]

[0027] The second aspect of the present invention provides a use of the above-mentioned blue light-emitting host composition in the preparation of an organic electroluminescent device.

[0028] The third aspect of the present invention provides an organic electroluminescent device, which includes an anode, a hole transport region, a light-emitting layer, an electron transport region, and a cathode arranged in sequence on a substrate; wherein the light-emitting layer includes one or more blue light-emitting host compositions as described above.

[0029] Furthermore, the light-emitting layer includes a host material and a guest material, wherein the host material includes one or more of the blue light-emitting host compositions described above.

[0030] A fourth aspect of the present invention provides a display panel, comprising the organic electroluminescent device as described above.

[0031] A fifth aspect of the present invention provides a display device, comprising the display panel as described above.

[0032] Beneficial effects of the present invention:

[0033] The present invention provides a blue light-emitting host composition. By using the two-component light-emitting host material with the same parent core and different deuterated positions as defined in the present invention, it can not only effectively improve the electron mobility and hole mobility of the organic electroluminescent device, but also further balance the carrier transport of the organic electroluminescent device. Based on the in-depth study of deuterated compounds, we found that different deuterated positions can have different degrees of influence on the electron and hole mobility of the material. By differentially deuterating different substituents of the two-component host material with the same skeleton, that is, deuterated anthracene nuclei and undeuterated Ar 21 The compound of formula I containing an undeuterated anthracene nucleus and a deuterated Ar 22 The combination of the compounds of formula II of the group can not only effectively improve the carrier transfer rate, but also further balance the carrier transfer, thereby effectively improving the efficiency and life of the organic electroluminescent device.

[0034] Secondly, by combining two-component main materials with the same skeleton, since the carbon skeleton of the composite material is the same, problems such as different evaporation rates or poor film-forming properties caused by different material structures can be avoided, thereby improving the stability of the organic electroluminescent device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the organic electroluminescent device of the present invention.

[0036] Description of the drawings: 1-substrate, 2-anode, 3-hole injection layer, 4-hole transport layer, 5-luminescence auxiliary layer, 6-luminescent layer, 7-hole blocking layer, 8-electron transport layer, 9-electron injection layer, 10-cathode. DETAILED DESCRIPTION

[0037] In order to more clearly understand the content of the present invention, it will be described in detail with reference to the drawings and embodiments.

[0038] The compounds of the present invention are suitable for use in light-emitting elements, display panels and electronic devices, and are particularly suitable for use in organic electroluminescent devices. The electronic device described in the present invention is a device comprising a layer of at least one organic compound, and the device may also comprise an inorganic material or a layer formed entirely of an inorganic material. The electronic device is preferably an organic electroluminescent device (OLED), an organic integrated circuit (O-IC), an organic field effect transistor (O-FET), an organic thin film transistor (O-TFT), an organic light-emitting transistor (O-LET), an organic solar cell (O-SC), an organic dye-sensitized solar cell (O-DSSC), an organic optical detector, an organic photoreceptor, an organic field quenching device (O-FQD), a light-emitting electrochemical cell (LEC), an organic laser diode (O-laser) and an organic plasma emission device. The electronic device is preferably an organic electroluminescent device (OLED). The structural schematic diagram of an exemplary organic electroluminescent device is shown in FIG. Figure 1 shown.

[0039] Experimental Section

[0040] In order to understand the content of the present invention more clearly, the polycyclic compound, the preparation method of the compound and the luminescent characteristics of the device will be explained in detail in conjunction with the examples. Various chemical reactions can be applied to the synthetic method of the compound of an embodiment of the present invention. However, it should be noted that the synthetic method of the compound of an embodiment of the present invention is not limited to the synthetic method described below. Unless otherwise indicated, the subsequent synthesis is carried out in anhydrous solvent under a protective gas atmosphere. Solvents and reagents can be purchased from conventional reagent suppliers.

[0041] Synthesis Example

[0042] Synthesis Example C1-1

[0043]

[0044] A1-1 (5.2 g, 20 mmol), B1-1 (8.0 g, 20 mmol) and potassium carbonate (4.1 g, 30 mmol) were added to a mixed solution of 300 ml of toluene and water, wherein the volume ratio of toluene to water was 4:1. Then, under nitrogen protection, tetrakistriphenylphosphine palladium (2.3 g, 2 mmol) was introduced. The reaction system was then heated to 110°C, refluxed and maintained for 8 hours, cooled to room temperature, quenched with water and separated. The organic phase was dried over anhydrous sodium sulfate, the solvent was removed by rotation, and the crude product was separated and purified using a petroleum ether: dichloromethane = 1:1 (V / V) column to finally obtain the product C1-1: 10.1 g, yield: 95%, MS (m / z) (M+): 536.

[0045] Synthesis Example C1-2

[0046]

[0047] Using the same method as synthesis example C1-1, A1-2 (5.7 g, 20 mmol) and B1-2 (7.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C1-2 was obtained: 10.1 g, yield: 94%, MS (m / z) (M+): 537.

[0048] Synthesis Example C2-1

[0049]

[0050] Using the same method as synthesis example C1-1, A2-1 (4.7 g, 20 mmol) and B2-1 (6.9 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C2-1 was obtained: 7.6 g, yield: 88%, MS (m / z) (M+): 434.

[0051] Synthesis Example C2-2

[0052]

[0053] Using the same method as synthesis example C1-1, A2-2 (5 g, 20 mmol) and B2-2 (6.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C2-2 was obtained: 7.7 g, yield: 88%, MS (m / z) (M+): 433.

[0054] Synthesis Example C3-1

[0055]

[0056] Using the same method as synthesis example C1-1, A3-1 (5.3 g, 20 mmol) and B3-1 (7.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C3-1 was obtained: 9.2 g, yield: 95%, MS (m / z) (M+): 485.

[0057] Synthesis Example C3-2

[0058]

[0059] Using the same method as synthesis example C1-1, A3-2 (5.3 g, 20 mmol) and B3-2 (8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C3-2 was obtained: 8.7 g, yield: 89%, MS (m / z) (M+): 486.

[0060] Synthesis Example C4-1

[0061]

[0062] Using the same method as synthesis example C1-1, A4-1 (5.7 g, 20 mmol) and B4-1 (9.4 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C4-1 was obtained: 9.7 g, yield: 86%, MS (m / z) (M+): 565.

[0063] Synthesis Example C4-2

[0064]

[0065] Using the same method as synthesis example C1-1, A4-2 (5.7 g, 20 mmol) and B4-2 (9.6 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C4-2 was obtained: 11 g, yield: 97%, MS (m / z) (M+): 566.

[0066] Synthesis Example C5-1

[0067]

[0068] Using the same method as synthesis example C1-1, A5-1 (8.1 g, 20 mmol) and B5-1 (6.9 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C5-1 was obtained: 8.6 g, yield: 84%, MS (m / z) (M+): 510.

[0069] Synthesis Example C5-2

[0070]

[0071] Using the same method as synthesis example C1-1, A5-2 (8.7 g, 20 mmol) and B5-2 (6.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C5-2 was obtained: 9.7 g, yield: 94%, MS (m / z) (M+): 513.

[0072] Synthesis Example C6-1

[0073]

[0074] Using the same method as synthesis example C1-1, A6-1 (8.1 g, 20 mmol) and B6-1 (6.7 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C6-1 was obtained: 8.7 g, yield: 90%, MS (m / z) (M+): 480.

[0075] Synthesis Example C6-2

[0076]

[0077] Using the same method as synthesis example C1-1, A6-2 (8.1 g, 20 mmol) and B6-2 (6.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C6-2 was obtained: 8.4 g, yield: 88%, MS (m / z) (M+): 479.

[0078] Synthesis Example C7-1

[0079]

[0080] Using the same method as synthesis example C1-1, A7-1 (8.7 g, 20 mmol) and B7-1 (6.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C7-1 was obtained: 6.9 g, yield: 72%, MS (m / z) (M+): 485.

[0081] Synthesis Example C7-2

[0082]

[0083] Using the same method as synthesis example C1-1, A7-2 (8.6 g, 20 mmol) and B7-2 (6.9 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C7-2 was obtained: 7 g, yield: 73%, MS (m / z) (M+): 484.

[0084] Synthesis Example C8-1

[0085]

[0086] Using the same method as the synthesis example C1-1, A8-1 (7.4 g, 20 mmol) and B8-1 (7.8 g, 20 mmol) were reacted to finally obtain the product C8-1: 7.3 g, yield: 75%, MS (m / z) (M+): 485.

[0087] Synthesis Example C8-2

[0088]

[0089] Using the same method as synthesis example C1-1, A8-2 (7.4 g, 20 mmol) and B8-2 (8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C8-2 was obtained: 8.9 g, yield: 91%, MS (m / z) (M+): 486.

[0090] Synthesis Example C9-1

[0091]

[0092] Using the same method as synthesis example C1-1, A9-1 (7.6 g, 20 mmol) and B9-1 (9.6 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C9-1 was obtained: 10.4 g, yield: 92%, MS (m / z) (M+): 566.

[0093] Synthesis Example C9-2

[0094]

[0095] Using the same method as synthesis example C1-1, A9-2 (8.1 g, 20 mmol) and B9-2 (9.4 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C9-2 was obtained: 9 g, yield: 80%, MS (m / z) (M+): 565.

[0096] Synthesis Example C10-1

[0097]

[0098] Using the same method as synthesis example C1-1, A10-1 (10.2 g, 20 mmol) and B10-1 (8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C10-1 was obtained: 7.1 g, yield: 66%, MS (m / z) (M+): 536.

[0099] Synthesis Example C10-2

[0100]

[0101] Using the same method as synthesis example C1-1, A10-2 (10.8 g, 20 mmol) and B10-2 (7.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C10-2 was obtained: 7.9 g, yield: 73%, MS (m / z) (M+): 537.

[0102] Synthesis Example C11-1

[0103]

[0104] Using the same method as synthesis example C1-1, A11-1 (11 g, 20 mmol) and B11-1 (7.8 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C11-1 was obtained: 8.1 g, yield: 77%, MS (m / z) (M+): 529.

[0105] Synthesis Example C11-2

[0106]

[0107] Using the same method as synthesis example C1-1, A11-2 (11.7 g, 20 mmol) and B11-2 (7.7 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C11-2 was obtained: 8.6 g, yield: 81%, MS (m / z) (M+): 530.

[0108] Synthesis Example C12-1

[0109]

[0110] Using the same method as synthesis example C1-1, A12-1 (9.3 g, 20 mmol) and B12-1 (8.3 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C12-1 was obtained: 6.6 g, yield: 65%, MS (m / z) (M+): 505.

[0111] Synthesis Example C12-2

[0112]

[0113] Using the same method as synthesis example C1-1, A12-2 (9.9 g, 20 mmol) and B12-2 (8.2 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C12-2 was obtained: 8.1 g, yield: 80%, MS (m / z) (M+): 504.

[0114] Synthesis Example C13-1

[0115]

[0116] Using the same method as synthesis example C1-1, A13-1 (14.4 g, 20 mmol), A13-1 (6.8 g, 20 mmol) replaced A1-1 and B1-1, and finally the product C13-1 was obtained: 6.4 g, yield: 63%, MS (m / z) (M+): 505.

[0117] Synthesis Example C13-2

[0118]

[0119] Using the same method as the synthesis example C1-1, A13-2 (15.3 g, 20 mmol) and A13-2 (6.7 g, 20 mmol) were used to replace A1-1 and B1-1, and the final product C13-2 was obtained: 7.4 g, yield: 72%, MS (m / z) (M+): 508.

[0120] Comparative Example Compound

[0121]

[0122]

[0123] Compound properties

[0124] Single carrier device testing

[0125] From the following formula, we know that the carrier balance coefficient γ is the factor that affects the external quantum efficiency (η EQE ) is a very important coefficient, which specifically refers to the relative ratio of carrier holes and electrons injected from the electrode during the light-emitting process of the OLED device. The maximum value of this coefficient is 1, that is, the number of hole injections is equal to the number of electron injections.

[0126] η EQE =γ×r ST ×q×η coupling

[0127] Among them, γ is the carrier balance coefficient, and its size directly represents the balance ratio of electrons and holes. STrepresents the single-triplet ratio, q represents the quantum yield, and ηcoupling represents the output coupling coefficient.

[0128] A single hole device and a single electron device are prepared respectively for calculation of the carrier balance coefficient. The structure of the single hole device prepared by the present invention is as follows:

[0129] ITO / MoO3(10nm) / HOST(100nm) / MoO3(10nm) / Al(150nm);

[0130] The structure of a single electron device is as follows:

[0131] ITO / Yb(10nm) / HOST(100nm) / Yb(10nm) / Al(150nm);

[0132] The preparation method of the above-mentioned single hole device and single electron device is similar to the conventional process of preparing organic electroluminescent devices, wherein the single hole device is formed by evaporating 10nm of MoO3, 100nm of HOST layer material, 10nm of MoO3, and 150nm of Al cathode on the ITO substrate in sequence, and then the evaporation substrate is packaged to prepare a single hole device. The single electron device is formed by evaporating 10nm of Yb, 100nm of HOST, 10nm of Yb, and 150nm of Al cathode on the ITO substrate in sequence, and then the evaporation substrate is packaged to prepare a single electron device. After completing the preparation of the above-mentioned single carrier device, the digital source meter Keithley 2400 is used to test the corresponding current density when the operating voltage is 3.2V, and the ratio (the slower of the hole mobility or the electron mobility as the denominator and the other as the numerator) is the carrier balance coefficient γ, which is dimensionless. The composition of the HOST layer material and the γ test results are shown in Table 1.

[0133] Table 1

[0134]

[0135]

[0136] It can be seen from the data in Table 1 that compared with the composition provided in the comparative example, the composition provided by the present invention has a higher carrier balance coefficient, indicating that the composition provided by the present invention, as a blue light host material, can effectively improve the carrier balance of the light-emitting layer of the organic light-emitting device.

[0137] Fabrication and characterization of OLEDs

[0138] Device Embodiment

[0139] The organic electroluminescent device provided by the present invention comprises an anode, a hole transport region, a light-emitting layer, an electron transport region, and a cathode which are sequentially arranged on a substrate;

[0140] Furthermore, the hole transport region includes a hole injection layer, a hole transport layer and a light-emitting auxiliary layer; and the electron transport region includes an electron transport layer and an electron injection layer.

[0141] Furthermore, the light-emitting layer is composed of a host material and a guest material, and the host material of the light-emitting layer can be composed of one molecular material or multiple molecular materials.

[0142] The composition of the present invention can be used for the light-emitting layer of the above-mentioned organic electroluminescent device.

[0143] The anode in the embodiment adopts anode materials commonly used in the art, such as ITO, Ag or their multilayer structures. The hole injection layer adopts hole injection materials commonly used in the art, and F4TCNQ, HATCN, NDP-9, etc. are added for doping. The hole transport layer adopts hole transport materials commonly used in the art. The light-emitting layer adopts the host and guest material composition provided by the present invention. The electron transport layer adopts electron transport materials commonly used in the art. The electron injection layer adopts electron injection materials commonly used in the art, such as Liq, LiF, Yb, etc. The cathode adopts materials commonly used in the art, such as metal Al, Ag or metal mixtures (Ag-doped Mg, Ag-doped Ca, etc.).

[0144] The electrode preparation method and the deposition method of each functional layer in this embodiment are conventional methods in the art, such as vacuum thermal evaporation or inkjet printing, etc., which will not be described in detail here. Only some process details and test methods in the preparation process are supplemented as follows:

[0145] Device Example 1

[0146] The substrates used in the present invention were subjected to the following operations: the ITO substrate was patterned so that its luminous area had a size of 3 mm×3 mm, and then water / isopropanol ultrasound, UV / ozone irradiation, and then dried at 100°C. After that, the ITO substrate was mounted on a substrate holder of a vacuum deposition device and the pressure was adjusted so that the vacuum rate became 1×10 -7torr. Then the following operations were performed: first, on the ITO layer (anode) formed on the substrate, the compound HTL-1 and the compound p-dopant-1 (the mass ratio of HTL-1 to p-dopant-1 was 97:3) were vacuum deposited with a thickness of 10 nm to form a hole injection layer; secondly, on the hole injection layer, the compound HTL-1 was vacuum deposited with a thickness of 120 nm to form a first hole transport layer; secondly, on the first hole transport layer, the compound EB-1 was vacuum deposited with a thickness of 5 nm to form a first electron blocking layer; secondly, on the first electron blocking layer, a mixture of the compound C1-1 and the compound BD1 was vacuum deposited with a thickness of 20 nm to form a first light-emitting layer, wherein C1-1 was used as a host material and BD1 was used as a guest material, and the mass ratio of the host material to the guest material was 98:2; then, on the first light-emitting layer, the compound HB-1 was vacuum deposited with a thickness of 5 nm. A first hole blocking layer is formed; then, ETL-1 and Liq (the mass ratio of ETL-1 to Liq is 1:1) are vacuum deposited on the first hole blocking layer with a thickness of 20 nm to form a first electron transport layer; then, Yb is vacuum deposited on the first electron transport layer with a thickness of 1 nm to form an electron injection layer, and then, Mg and Ag (the mass ratio of Mg to Ag is 1:9) are deposited on the electron injection layer with a thickness of 15 nm to form a cathode, and then, compound CPL-1 is deposited on the cathode with a thickness of 50 nm to form a covering layer, and finally, the vapor-deposited substrate is packaged, and the cleaned cover plate is coated with UV glue using a glue coating device, and then the coated cover plate is moved to a pressing section, and the vapor-deposited substrate is placed on 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 at the same time, the UV glue is light-cured to prepare a laminated organic electroluminescent device.

[0147] Except for the guest material of the light-emitting layer, the molecular structures of the materials in the remaining layers are as follows:

[0148]

[0149] Device Example 2-39

[0150] The above method is used to prepare the compounds described in the synthesis examples into organic electroluminescent devices, wherein C1-1 in device example 1 is replaced by the host materials used in the device examples in Table 2 to prepare organic electroluminescent device examples 2-39.

[0151] Device Comparison Examples 1-13

[0152] The above method was used to prepare the compounds described in the comparative examples into organic electroluminescent devices, wherein the host materials used in the comparative examples of the devices in Table 2 were used to replace C1-1 in device example 1 to prepare comparative examples of organic electroluminescent devices 1-13.

[0153] The OLED devices described above were tested by standard methods. For this purpose, at J = 10 mA / cm 2 The driving voltage, brightness, electroluminescent current efficiency (measured in cd / A) and external quantum efficiency (EQE, measured in percentage) of the organic electroluminescent device are determined at a current density of 200 mA / cm2, which is calculated as a function of the luminous density from the current / voltage / luminous density characteristic line (IVL characteristic line) showing Lambertian emission characteristics. The lifespan LT is defined as the time after which the brightness drops from the initial luminous brightness L0 to a specific proportion L1 when operating at a constant current J; J = 20 mA / cm2 2 The expression L1 = 90% means that at 20 mA / cm 2 When working under LT, the luminance drops to 90% of its initial value L0 after time LT. Similarly, J = 20 mA / cm 2 , L1 = 95% means, at 20mA / cm 2 When working under LT, the luminous brightness drops to 95% of its initial value L0 after time LT.

[0154] The data of various OLED devices are summarized in Table 2. Various parameters of the device examples and the device comparative examples are compared to show the performance data of various OLED devices.

[0155] The test instruments and methods for testing the performance of the OLED devices in the above embodiments and comparative examples are as follows:

[0156] Quantum efficiency CE (cd / A) and color coordinates (CIEy) were tested using a spectrum scanner PhotoResearch PR-735;

[0157] Current density and lighting voltage: tested using a digital source meter Keithley 2400;

[0158] Blue index is obtained by dividing the quantum efficiency CE (cd / A) by the color coordinate (CIEy);

[0159] Life test: Use LT-96ch life test device.

[0160] The performance test results of the above devices are listed in Table 2.

[0161] Table 2 Blue light device performance test results

[0162]

[0163]

[0164]

[0165] 1) It can be seen from the data in Table 2 that the efficiency and life of the organic electroluminescent device using the composition provided by the present invention as the main material are higher than the efficiency and life of the organic electroluminescent device using a certain compound in the composition provided by the present invention as the main material, indicating that only by using the composition provided by the present invention can the efficiency and life of the organic electroluminescent device be improved.

[0166] 2) The voltage and efficiency of the organic electroluminescent device using the composition provided by the present invention as the main material are superior to the voltage and efficiency of the organic electroluminescent device using the composition provided by the comparative example as the main material.

[0167] 3) It can be seen from the device results that, compared with the case where a certain compound in the composition provided by the present invention is used alone as the main material, the combination of two or more materials as the blue light main material can balance the carrier transport of the light-emitting layer, so the efficiency or life of the organic electroluminescent device using the composition provided by the present invention as the main material is higher. Especially for device embodiment 3, device embodiment 6, device embodiment 15, and embodiment 36, the performance improvement brought by the combined use is higher through the differentiated adjustment of the deuterated anthracene and furan structures. For device embodiment 33 and device embodiment 39, the efficiency is slightly improved by the differentiated adjustment of the deuterated position on benzene / naphthalene / anthracene, and more importantly, there is a significant improvement in the life span. This is because the fully deuterated compound cannot be adjusted to a better balance level due to the simultaneous influence on the transport of holes and electrons. In addition, an excessively high deuterated rate will also affect carrier transport, resulting in a slight increase in the driving voltage. On the other hand, the device life is affected by the most unstable material in the entire device. The use of non-deuterated structures will significantly reduce the overall device stability and reduce the luminescence life.

[0168] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A blue light-emitting host composition, characterized in that: The blue light-emitting host composition comprises a first component and a second component, wherein the general structural formula of the first component is shown in Formula I, and the general structural formula of the second component is shown in Formula II: Ar1 is selected from deuterated or unsubstituted phenyl or naphthyl; L is selected from deuterated or non-deuterated phenyl; Ar 21 Select one of the following structures: Ar 22 Ar 21 deuterated structure.

2. The blue light-emitting host composition according to claim 1, characterized in that: The Ar 21 Select one of the following structures:

3. The blue light-emitting host composition according to claim 1, characterized in that: The Ar 22 Select one of the following structures:

4. The blue light-emitting host composition according to claim 1, characterized in that: The first component is selected from one of the structures shown below:

5. The blue light-emitting host composition according to claim 1, characterized in that: The second component is selected from one of the structures shown below:

6. Use of the blue light-emitting host composition as claimed in claim 1 in the preparation of an organic electroluminescent device.

7. An organic electroluminescent device, characterized in that: It comprises an anode, a hole transport region, a light-emitting layer, an electron transport region, and a cathode which are sequentially arranged on a substrate; wherein the light-emitting layer comprises one or more blue light-emitting main compositions as described in any one of claims 1 to 5.

8. The organic electroluminescent device according to claim 7, characterized in that: The light-emitting layer comprises a host material and a guest material, wherein the host material comprises one or more blue light-emitting host compositions according to any one of claims 1 to 5.

9. A display panel, characterized in that: The organic electroluminescent device comprises the organic electroluminescent device according to claim 7 or 8.

10. A display device, characterized in that: Comprising the display panel as claimed in claim 9.

Images