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Organic light emitting diode with double-layer electron transport layer and preparation method thereof

A technology of electron transport layer and light-emitting diode, which is applied in the direction of organic semiconductor devices, circuits, electrical components, etc., can solve the problem that electron injection and transport capabilities are inferior to holes, and achieve large-area production, reduce costs, and improve utilization. Effect

Inactive Publication Date: 2014-09-24
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that electron injection and transport capabilities are inferior to holes in most solution-processed organic electroluminescent devices

Method used

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  • Organic light emitting diode with double-layer electron transport layer and preparation method thereof

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Embodiment 1

[0072] 2) Alcohol solution of acetylacetonate metal salt: Dissolve lithium acetylacetonate (Li(acac)) in anhydrous methanol to prepare a solution with a concentration of 1 mg / ml.

[0073] An organic light-emitting diode with a double-layer structure electron transport layer was prepared according to the following steps:

[0074] (1) Spin-coated hole transport layer PEDOT:PSS:

[0075] Firstly, the PEDOT:PSS solution was filtered with a 0.45 μm filter head, and then spin-coated at a speed of 3000 rpm for 40 s with a homogenizer to form a film. Subsequently, the film was annealed at 120 °C for 30 min.

[0076] (2) Spin-coated luminescent layer:

[0077] The light-emitting layer is made of blue phosphorescent materials (bis(4,6-difluorophenylpyridine-N,C2) pyridine iridium) (Firpic) and 2,2'-(1,3-phenyl)bis[5 -(4-tert-butylphenyl)-1,3,4-oxadiazole] (OXD-7) into the blue light-emitting material layer made of polymer host polyvinylcarbazole (PVK), according to PVK: FIrpic: OXD-7=...

Embodiment 2

[0090] Example 3

[0091] The device was prepared according to the method of Example 1, except that the luminescent material was a white light luminescent material mixed with blue light and orange red phosphorescent materials. As a lighting application, the complementary color scheme device has a simple structure and high efficiency. Usually, phosphorescent materials can be used to obtain high efficiency, and the chromaticity of white light can be controlled to a certain extent. Among them, FIrpic is selected as the blue-light phosphorescent material, and FIrpic is selected as the orange-red phosphorescent material (acetylacetonate bis(2-phenylbenzothiazole-C2,N) iridium(III)) (Ir(BT) 2 (acac)), the main material is PVK, the carrier transport material is OXD-7, and the ratio (weight ratio) of each compound in the light-emitting layer is PVK:FIrpic:OXD-7:Ir(BT) 2 (acac) = 10:1:4:0.04. In white light devices, when octane is used as the dispersant of ZnO nanoparticles, the de...

Embodiment 3

[0093] Implementation steps:

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Abstract

The invention relates to an organic light emitting diode with a double-layer electron transport layer and a preparation method thereof. The preparation method is characterized in that the double-layer electron transport layer is prepared by a solution method, namely, an ultra-thin acetylacetonate metal salt film is deposited on a light emitting layer of the device by the solution method first, and then a zinc oxide nano particle film is deposited on the ultra-thin acetylacetonate metal salt film by the solution method, thus realizing preparation of the double-layer electron transport layer through a full solution method. By adopting the method to prepare the electron transport layer of the organic light emitting diode, injection and transport of electrons in the device can be improved, charge transfer between the light emitting layer and the zinc oxide layer can be effectively inhibited, the device is enabled to get light emitting efficiency a hundred times higher than that of a conventional device, and the device has lower driving voltage and higher brightness. The method of the invention is widely used in the field of organic light emitting devices.

Description

technical field [0001] The invention belongs to the field of organic semiconductor devices, and relates to a double-layer structure electron transport layer in an organic light-emitting diode and its solution method preparation. Background technique [0002] Organic light-emitting diodes are self-luminous, and have the advantages of high color quality, fast response, wide viewing angle, ultra-thin, green and environmental protection, and can realize large-area flexible light emission. With the gradual improvement of the solution preparation method, its low-cost potential has been gradually discovered, showing that it has great application potential in the fields of next-generation information display and solid-state lighting. However, the performance of organic electroluminescent devices is not perfect at this stage, and there are still great limitations in production technology and cost. Compared with the vacuum evaporation method, the solution method can improve the utili...

Claims

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Application Information

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IPC IPC(8): H01L51/54H01L51/52H01L51/56
CPCH10K50/166H10K2102/00H10K71/00
Inventor 李立东徐新军贾曼平田原王金山
Owner UNIV OF SCI & TECH BEIJING
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