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An organic electroluminescent device

An electroluminescent device and a luminescent technology, applied in the field of OLED devices, can solve problems such as harsh processes, achieve the effects of improving activity, improving device efficiency, and prolonging device life

Active Publication Date: 2018-11-13
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This type of compound is an N-type dopant, which is used as an injection layer and a barrier layer. When it is used as an injection layer, it is used as an N-type dopant, and must be doped in the host material to increase the carrier Transmission speed, and this material needs to be used for photoinitiation, and the process is harsh

Method used

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  • An organic electroluminescent device
  • An organic electroluminescent device
  • An organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The structure of device 1:

[0085] ITO / HATCN[5nm] / NPB[30nm] / TCTA[10nm] / CBP[30nm]:10wt%Ir(ppy) 3 / Bphen[40nm] / Formula (1-3)[0.5nm] / Al[150nm]

[0086] The structure of comparative device 1 is as follows:

[0087] ITO / HATCN[5nm] / NPB[30nm] / TCTA[10nm] / CBP[30nm]:10wt%Ir(ppy) 3 / Bphen[40nm] / Al[150nm]

[0088] The structure of comparative device 2 is as follows:

[0089] The structure of this comparative example is the same as that of comparative example 1, the only difference being that the material used in the electron injection layer is LiF:

[0090] ITO / HATCN[5nm] / NPB[30nm] / TCTA[10nm] / CBP[30nm]:10wt%Ir(ppy) 3 / Bphen[40nm] / LiF[0.5nm] / Al[150nm]

[0091] Device 1, comparative device 1 and comparative device 2 have the same structure, the only difference is that the material used for the electron injection layer of device 1 is o-MeO-DMBI-I shown in formula (1-3), and the comparative device 1 has no electron injection layer material Compared with the comparative device 2...

Embodiment 2- Embodiment 5

[0096]The structure of the device 2-device 5 of the embodiment 2-the embodiment 5 is the same as that of the device 1, and the only difference lies in the thickness of the electron injection layer. Table 2 shows the performance test results.

[0097] Table 2

[0098]

[0099]

[0100] Current density of comparative device 1 (control device curve in the figure), comparative device 2 (LiF 0.5 nanometer curve in the figure) and device 1-device 5 (radical 1nm, radical 2nm, radical 3nm, radical 4nm, radical 6nm curves in the figure) - Brightness curve see Figure 6 、Current efficiency-brightness curve see Figure 7 , power efficiency-brightness curve see Figure 8 , Figure 6-Figure 8 It shows that as the thickness of the electron injection layer increases, the driving voltage gradually increases, at 35700cd / m 2 Under the luminous brightness, the maximum current efficiency first increases and then decreases with the increase of the thickness of the electron injection laye...

Embodiment 6

[0102] The structure of device 6 is the same as that of device 1, and the thickness of the electron injection layer is 3nm. The electron injection layer adopts different benzimidazole electron injection materials protected by the present invention. Table 3 shows the performance test results.

[0103] table 3

[0104]

[0105] As shown in the data in Table 3, the benzimidazole material protected by the present invention is used as an electron injection material, and the device where it is located is at 35700cd / m 2 Under the luminous brightness, it has a large current efficiency and a low driving voltage, so the benzimidazole material protected by the present invention is used as an electron injection material, so that the barrier between the cathode and the interface of the organic electron transport layer is reduced, and no longer It is necessary to set up an insulating buffer layer, which improves the transport capacity of carriers, thereby improving the efficiency of the ...

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Abstract

The invention relates to an organic electroluminescent device, which comprises a first electrode layer, a light-emitting layer, an electron injection layer and a second electrode layer stacked together, and the electron injection layer and the second electrode layer are arranged in physical contact. The electron injection layer comprises an organic ion salt of benzimidazole represented by formula (I), a benzimidazole neutral organic material represented by formula (II), and a dimerization of benzimidazole organic material represented by formula (III). One or more in the body, this type of material reduces the potential barrier between the second electrode layer and the interface of the organic electron transport layer, improves the transport capacity of carriers, so that the electron injection layer and the The second electrode layer is arranged in direct physical contact, and an insulating buffer layer is no longer required, which has the properties of improving device efficiency and prolonging device life.

Description

technical field [0001] The invention belongs to the field of OLED devices, in particular to an organic electroluminescent device. Background technique [0002] The organic electroluminescent device includes an anode layer, an organic light emitting functional layer and a second electrode layer; the organic light emitting functional layer includes a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer and an electron injection layer. Since there is a large electron injection barrier between the cathode and the interface of the organic electron transport layer, in order to improve the balance between electrons and holes, an insulating buffer layer, such as a LiF layer ( 0.5nm), after the introduction, the potential barrier is reduced, the electron injection ability is significantly improved, the driving voltage is reduced, and the luminous efficiency is improved. However, the evaporation temperature of LiF is high (620-640...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/60H10K50/171
Inventor 段炼宾正杨刘嵩赵菲
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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