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Electron transport material and organic electroluminescence device thereof

A technology of electron transport material and electron transport layer, which is applied in the field of OLED devices, can solve the problems of electroluminescent devices that are difficult to achieve charge transfer balance, low charge combination efficiency, and high lighting voltage of devices, so as to improve light extraction efficiency and luminescence Brightness, the effect of reducing the lighting voltage

Inactive Publication Date: 2010-11-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing organic semiconductor materials, the transport speed of hole transport materials for holes is much faster than that of electron transport materials for electrons, so it is difficult to achieve charge transport balance and charge combination efficiency in electroluminescent devices. Very low, resulting in a high turn-on voltage of the device (4-5V), and low brightness of the device in the low-voltage region (3-8V), so improving the ability of the device in terms of electron injection and transmission can greatly improve the photoelectric characteristics of the device

Method used

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  • Electron transport material and organic electroluminescence device thereof
  • Electron transport material and organic electroluminescence device thereof
  • Electron transport material and organic electroluminescence device thereof

Examples

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Effect test

Embodiment 1

[0029] Embodiment one, the synthesis of 8-hydroxyl-5-nitroquinoline aluminum

[0030] Separately configure 8-hydroxy-5-nitroquinoline and AlCl 3 Saturated solution of absolute ethanol (dissolving 1 gram of 8-hydroxy-5-nitroquinoline requires about 450 ml of absolute ethanol, dissolving 1 gram of AlCl 3 about 25 ml absolute ethanol), then press AlCl 3 : 8-hydroxy-5-nitroquinoline molar ratio 1:3 AlCl 3 The solution was added dropwise to the 8-hydroxy-5-nitroquinoline solution, stirred at room temperature for 8-10 hours and then filtered. After the obtained solid is purified by vacuum sublimation, pure aluminum 8-hydroxy-5-nitroquinoline is obtained.

[0031]

Embodiment 2

[0032] Embodiment 2, measurement of electron transport performance

[0033] The commonly used electron transport material Alq 3 As a reference, Al / LiF was used as an electrode to prepare a device with only electrons as carriers to characterize the electron transport ability of organic materials.

[0034] Device 2a (reference device)

[0035] Using Al / LiF as an electrode to prepare a device with only electrons as carriers to characterize Alq 3 electron transport capability. Device 2a is structured as Figure 1a As shown, on the anode ITO are Al (50nm), Alq 3 (40nm), and cathode Al (110nm), the device preparation steps are as follows:

[0036] (1) Cleaning ITO: Ultrasonic cleaning in deionized water, acetone, and ethanol for 10 minutes, and then processing in a plasma cleaning instrument for 1 minute;

[0037] (2) Vacuum-evaporated Al on the anode ITO, the thickness

[0038] (3) Vacuum evaporation of LiF on Al, the rate thickness

[0039] (4) Vacuum evaporation o...

Embodiment 3

[0052] Embodiment three, the measurement of OLED device performance

[0053] On the basis of the classic OLED green light device, it is verified that the electron transport material 8-hydroxy-5-nitroquinoline aluminum of the present invention improves the device performance.

[0054] Device 3a (reference device)

[0055] Device 3a is an OLED green device of classical materials, with Alq 3 As a luminescent material, the structure such as Figure 3a As shown, on the anode ITO is the hole transport layer NPB (50nm), the light emitting and electron transport layer Alq 3 (60nm), electron injection layer and cathode Al (110nm). The fabrication steps of device 3a are as follows:

[0056] (1) Cleaning ITO: Ultrasonic cleaning in deionized water, acetone, and ethanol for 10 minutes, and then processing in a plasma cleaning instrument for 1 minute;

[0057] (2) Vacuum-evaporated hole transport layer NPB on the anode ITO, the rate thickness

[0058] (3) Vacuum-evaporated lumi...

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Abstract

The invention discloses an electron transport material and an organic electroluminescence device thereof. The electron transport material is 8-hydroxyl-5-hydroxyquinoline aluminum coordination compound. The electron transport material has good electronic transmission characteristics, can be used as an electron transport layer alone or in combination with other organic electron transport materials, and is applied to the organic electroluminescence device. With nitro groups of strong electron-withdrawing group, the 8-hydroxyl-5-hydroxyquinoline aluminum has better electronic transmission characteristics than Alq3, has LUMO energy level between those of Alq3 and LiF / Al, and can be used as a buffer layer to make transmission of two kinds of current carriers (electrons and holes) in the device more balanced so as to improve light output efficiency of the device, and particularly can effectively reduce light starting voltage of the device and improve luminosity of the device in a low pressure area (3 to 8.5 V).

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices (OLEDs), in particular to an organic material with better electron transport properties and a corresponding OLED device. Background technique [0002] The structure of a general OLED device is an anode, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode in sequence. When a voltage is applied to both ends of the device, holes and electrons are respectively injected from the anode and the cathode, transported, recombined in the light-emitting layer to form excitons, and the excitons de-excite and emit light. [0003] In the existing organic semiconductor materials, the transport speed of hole transport materials for holes is much faster than that of electron transport materials for electrons, so it is difficult to achieve charge transport balance and charge combination efficiency in electroluminescent devices. Very low, resulting in a high tu...

Claims

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Application Information

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IPC IPC(8): C07D215/30C09K11/06H01L51/54H01L51/50
Inventor 陈志坚罗方闻肖立新孔胜段来强龚旗煌
Owner PEKING UNIV
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