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Reverse top emission organic light-emitting device and preparing method thereof

A luminescence and top-emission technology, applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of low luminous efficiency of devices, light loss, affecting luminous efficiency, etc., to improve electron transmission rate, light The effect of reducing the loss and improving the light extraction efficiency

Inactive Publication Date: 2013-10-30
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the traditional electroluminescent devices, the most researched one is the bottom-emitting device structure, with the ITO glass substrate as the light-emitting surface. This kind of device has mature technology and has been studied a lot. Because the light will first go through the absorption and reflection of the ITO conductive material. , it needs to be absorbed and reflected by the glass again, and finally it can be emitted into the air. Since the glass surface is relatively flat and the glass thickness is relatively large, the optical path is increased, so that more light is refracted to both sides of the glass. The probability of light emitted from the glass to the device is reduced, which ultimately affects the luminous efficiency. Therefore, the emission rate of light emitted into the air is very low, and most of the light is lost. The luminous efficiency of this type of device is low.

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  • Reverse top emission organic light-emitting device and preparing method thereof
  • Reverse top emission organic light-emitting device and preparing method thereof

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preparation example Construction

[0035] The method for preparing the above-mentioned stacked inverted top-emitting organic electroluminescent device includes the following steps:

[0036] S1. Clean the glass substrate sequentially with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes to remove organic pollutants on the glass surface

[0037] S2. Using an evaporation process, prepare a cathode layer on the surface of the cleaned glass substrate:

[0038] S3, then using an electron beam or an evaporation process to prepare a doped scattering layer on the surface of the cathode layer; the doped scattering layer is TiO 2 Doping with carbonate particles, the doping mass percentage of the carbonate particles is 5-30%; the thickness of the doped scattering layer is 50-300nm;

[0039] S4, using an evaporation process, sequentially stacking an evaporation hole blocking layer, a light emitting layer, a hole transport layer, a hole injection layer and an anode layer on the surface of the doped...

Embodiment 1

[0045] The structure of the inverted top-emitting organic electroluminescent device in this embodiment: glass / Ag / TiO 2 :CaCO 3 / TPBi / TAZ:Ir(ppy) 3 / NPB / MoO 3 / Ag.

[0046] The fabrication process of the inverted top-emitting organic electroluminescent device is as follows:

[0047] First, ultrasonically clean the glass substrate with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes each to remove organic pollutants on the glass surface;

[0048] Next, using an evaporation process, prepare a cathode layer on the surface of the cleaned glass substrate, the material is Ag, and the thickness is 100nm;

[0049] Subsequently, a doped scattering layer with a thickness of 200 nm was prepared on the surface of the cleaned glass substrate: CaCO with a particle size of 200 nm 3 and TiO with a particle size of 20 nm 2 For doping, CaCO 3 The doping mass percentage is 20%;

[0050] Secondly, using the electron beam process, prepare a hole blocking layer (...

Embodiment 2

[0053] The structure of the inverted top-emitting organic electroluminescent device in this embodiment: glass / Au / TiO 2 :MgCO 3 / TAZ / TAZ:Ir(MDQ) 2 (acac) / TAPC / V 2 o 5 / Au.

[0054] The fabrication process of the inverted top-emitting organic electroluminescent device is as follows:

[0055] First, ultrasonically clean the glass substrate with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes each to remove organic pollutants on the glass surface;

[0056] Next, using an evaporation process, prepare a cathode layer on the surface of the cleaned glass substrate, the material is Au, and the thickness is 80nm;

[0057] Subsequently, a doped scattering layer with a thickness of 50 nm was prepared on the surface of the cleaned glass substrate by evaporation process: MgCO with a particle size of 100 nm 3 and TiO with a particle size of 20 nm 2 For doping, MgCO 3 The doping mass percentage is 5%;

[0058] Secondly, using an electron beam process, a h...

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Abstract

The invention belongs to the field of reverse top emission organic light-emitting devices and discloses a reverse top emission organic light-emitting device and a preparing method thereof. The reverse top emission organic light-emitting device comprises a glass base plate, a cathode layer, a doping scattering layer, a hole blocking layer, a light-emitting layer, a hole transfer layer, a hole injection layer and an anode layer which are overlapped in sequence. The doping scattering layer is made of TiO2 mixed with carbonate particles. According to the reverse top emission organic light-emitting device, doping of TiO2 and carbonate is used for preparing an electron transfer layer capable of scattering, electron transfer efficiency is improved, and meanwhile light emitted towards a cathode is reflected and scattered through a titanium dioxide layer, when carbonate is added for doping, a strong reflecting effect on light is achieved, and light going-out efficiency is directly improved. Titanium dioxide is high in refractive index, so that part of light goes back to the top of a component because of total reflection, and light going-out efficiency is further improved.

Description

technical field [0001] The invention relates to the field of electroluminescent devices, in particular to an inverted top-emitting organic electroluminescent device and a preparation method thereof. Background technique [0002] In 1987, C.W.Tang and Van Slyke of Eastman Kodak Company in the United States reported a breakthrough in the research of organic electroluminescence. A double-layer inverted top-emitting organic electroluminescent device (OLED) with high lumen efficiency and high efficiency has been prepared by ultra-thin film technology. In this double-layer structure device, the lumen efficiency reaches 1000cd / m at 10V 2 , its luminous efficiency is 1.51lm / W, and its lifespan is more than 100 hours. [0003] The principle of OLED light emission is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupi...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/52H01L51/54
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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