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Organic light-emitting device and preparation method therefor

An electroluminescent device and a luminescent technology, which are applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve problems such as limited barrier capacity, increased production costs, and optimal efficiency of blue light-emitting devices.

Inactive Publication Date: 2017-08-04
GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the F-P optical microcavity formula, the resonant cavity lengths required for the red, green, and blue light-emitting layers are different, and simply forming a common layer as the light extraction layer cannot improve the efficiency of red, green, and blue light-emitting devices. To achieve the optimum, if the evaporation method is used to form light extraction layers of different thicknesses to optimize the efficiency of red, green, and blue light-emitting devices, this requires the use of 3 Fine metal masks (FMM), which will greatly increase Production cost; In addition, organic materials are used as the light extraction layer in the current mass production process. In addition to improving light extraction, it has a certain protective effect on OLEDs, but organic materials have limited barriers to water and oxygen.

Method used

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  • Organic light-emitting device and preparation method therefor

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Effect test

Embodiment 1

[0035] A method for preparing an organic electroluminescent device in this embodiment comprises the following steps:

[0036] Inorganic oxide light extraction layer encapsulation glass cover plate preparation:

[0037](1) Spin-coat a layer of photoresist with a thickness of about 1 μm on the glass substrate, use a mask corresponding to the red, green, and blue pixel openings to expose, develop, and then heat-treat at 200°C for 20 minutes, that is, on the packaging glass A red pixel window area, a green pixel window area and a blue pixel window area are formed on the cover;

[0038] (2) Preparation of the light extraction layer: place the patterned packaging glass cover on the printer platform, and print inorganic oxides with different thicknesses in the red pixel window area, green pixel window area and blue pixel window area. Precursor solution (specifically MoO 3 Precursor solution), after printing, heat treatment at 200°C for 1 hour to form a layer of transparent oxides w...

Embodiment 2

[0048] A method for preparing an organic electroluminescent device in this embodiment comprises the following steps:

[0049] Inorganic oxide light extraction layer encapsulation glass cover plate preparation:

[0050] (1) Spin-coat a layer of photoresist with a thickness of about 1 μm on the glass substrate, use a mask corresponding to the red, green, and blue pixel openings to expose, develop, and then heat-treat at 200°C for 20 minutes, that is, on the packaging glass A red pixel window area, a green pixel window area and a blue pixel window area are formed on the cover;

[0051] (2) Preparation of the light extraction layer: place the patterned packaging glass cover on the printer platform, and print inorganic oxides with different thicknesses in the red pixel window area, green pixel window area and blue pixel window area. Precursor solution (specifically ZnO precursor solution), after printing, heat treatment at 200°C for 1 hour to form a layer of transparent oxides wit...

Embodiment 3

[0061] A method for preparing an organic electroluminescent device in this embodiment comprises the following steps:

[0062] Inorganic oxide light extraction layer encapsulation glass cover plate preparation:

[0063] (1) Spin-coat a layer of photoresist with a thickness of about 1 μm on the glass substrate, use a mask corresponding to the red, green, and blue pixel openings to expose, develop, and then heat-treat at 200°C for 20 minutes, that is, on the packaging glass A red pixel window area, a green pixel window area and a blue pixel window area are formed on the cover;

[0064] (2) Preparation of the light extraction layer: place the patterned packaging glass cover on the printer platform, and print inorganic oxides with different thicknesses in the red pixel window area, green pixel window area and blue pixel window area. Precursor solution (specifically NiO precursor solution), after printing, heat treatment at 200°C for 1 hour to form a layer of transparent oxides wit...

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Abstract

The invention relates to an organic light-emitting device and a preparation method therefor. The organic light-emitting device comprises a packaging glass cover plate, a light extracting layer, a negative electrode layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole inject layer and a positive electrode layer which are stacked in sequence; and the light extracting layer is provided with a red pixel region, a green pixel region and a blue pixel region of different thicknesses. The inorganic oxide light extracting layer is prepared on the glass cover plate by adopting a technology which combines photoetching developing and ink-jet printing, so that luminous efficiency of red, green and blue devices can be optimized on one hand; and on the other hand, by using the inorganic oxide as the light extracting layer, the water oxygen blocking capacity of the devices can be reinforced, the service life of the devices can be prolonged, Tact time of OLED evaporation can be reduced, and yield can be improved.

Description

technical field [0001] The invention relates to the technical field of light emitting devices, in particular to an organic electroluminescent device and a preparation method thereof. Background technique [0002] Organic light-emitting diodes (OLEDs) have attracted widespread attention because of their active light emission, wide viewing angle, fast response, light weight, adjustable color, and flexibility. They have broad application prospects in display, lighting, and other fields. The parameters to measure the luminous performance of organic light-emitting diodes mainly include: external quantum efficiency, current efficiency, driving voltage, device life, and color purity, wherein the current efficiency is directly proportional to the external quantum efficiency. How to improve the external quantum efficiency of the device is the key to improving the light-emitting performance of organic light-emitting diodes. [0003] External quantum efficiency (EQE) refers to the rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/56
CPCH10K50/00H10K50/85H10K71/00
Inventor 余磊宋晶尧
Owner GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD