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Benzimidazole n-type dopant and application thereof in organic electroluminescent devices

A technology of benzimidazole and dopant, applied in the field of organic electroluminescent materials, can solve the problems of few co-evaporable mixed materials and difficult control of doping concentration, so as to improve the efficiency and stability of the device and facilitate long-term storage. , the effect of reducing costs

Inactive Publication Date: 2019-10-18
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

Additional energy needs to be provided, and there are few materials that can be co-evaporated and blended, and the doping concentration is not easy to control

Method used

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  • Benzimidazole n-type dopant and application thereof in organic electroluminescent devices
  • Benzimidazole n-type dopant and application thereof in organic electroluminescent devices
  • Benzimidazole n-type dopant and application thereof in organic electroluminescent devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The device 1 structure of the present embodiment is as follows:

[0092] ITO(150nm) / HATCN(40nm) / NPB(30nm) / TCTA(10nm) / CBP:5wt%Ir(ppy) 3 (30nm) / Bphen(30nm) / Bphen: 30wt% Formula (1-3)(20nm) / Al(150nm)

[0093] Wherein, the (o-MeO-DMBI-I) structural formula shown in formula (1-3) is as follows:

[0094]

[0095] The 30 wt% before o-MeO-DMBI-I in Device 1 represents the doping concentration of o-MeO-DMBI-I in the electron transport material.

[0096] The specific preparation method of the organic electroluminescent device is as follows:

[0097] First, the glass substrate is cleaned with detergent and deionized water, and dried under an infrared lamp, and a layer of anode material is sputtered on the glass with a film thickness of 150nm;

[0098] Then, the above-mentioned glass substrate with the anode is placed in a vacuum chamber, and the vacuum is evacuated to 1×10 -4 Pa, continue to vapor-deposit HATCN as a hole injection layer on the above-mentioned anode layer fi...

Embodiment 2-17

[0116] In order to test the influence of the host material of the present invention on the performance of the organic electroluminescent device, the organic electroluminescent device was prepared in the same method as in the above-mentioned Example 1 in this example, and the structure of the device 2-17 is as follows:

[0117] ITO(150nm) / NPB(40nm) / CBP: 3% phosphorescent dye (Ir(ppy) 3 )(30nm) / Bphen(20nm) / LiF(0.5nm) / Al(150nm).

[0118] In this embodiment and hereinafter, the doping concentrations of benzimidazole n-type dopants are all wt%, that is, 0.5, 1, 5, 10, 20, and 30 represent 0.5wt%, 1wt% respectively. %, 5wt%, 10wt%, 20wt%, 30wt%.

[0119] The properties of the organic electroluminescent device are shown in Table 4 below:

[0120] Table 4

[0121]

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PUM

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Abstract

The invention relates to a benzimidazole n-type dopant, which has an organic ion salt containing benzimidazole halogen anion with a structure shown as formula (1), a neutral n-type doping material with a structure shown as formula (2) or a dimer n-type doping material with a structure shown as formula (3). When used as a dopant of an electron transport material, the benzimidazole n-type dopant canenhance electron injection, improve the film electron mobility and carrier concentration, increase device current density, and improve the device efficiency and stability.

Description

[0001] This application is a divisional application of "the application date is 2015-07-02, the application number is: 201510382456.3, and the invention name is benzimidazole n-type dopant and its application in organic electroluminescent devices". technical field [0002] The invention belongs to the field of organic electroluminescence materials, and in particular relates to a benzimidazole n-type dopant applicable to organic electroluminescence devices and its application in the field of organic electroluminescence. Background technique [0003] The light-emitting layer of the organic electroluminescent device OLED is mainly made of all fluorescent materials, all phosphorescent materials or a mixture of fluorescent materials and phosphorescent materials. Because blue light, green light, and red light devices have different requirements for the hole transport layer HTL, especially green light and red light must have a high triplet energy level T for HTL materials. 1 , but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D235/02H01L51/50H01L51/54
CPCC07D235/02C07D235/18C07D235/20H10K85/636H10K85/631H10K85/6572
Inventor 段炼宾正杨刘嵩谢静赵菲
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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