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White organic electroluminescent device and manufacturing method thereof

A luminescence and electromechanical technology, applied in semiconductor/solid-state device manufacturing, electric solid-state devices, electrical components, etc., can solve problems such as yellowish color coordinates and complex device structures, and achieve the effect of ensuring color stability

Active Publication Date: 2012-11-14
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing white organic electroluminescent device with blue fluorescence, green and red phosphorescence coexists, and the external quantum efficiency reaches 18.7% by designing a single interconnection layer to cleverly use triplet excitons. The disadvantage is that its color coordinates are obviously yellowish, and The device structure is relatively complex

Method used

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  • White organic electroluminescent device and manufacturing method thereof
  • White organic electroluminescent device and manufacturing method thereof
  • White organic electroluminescent device and manufacturing method thereof

Examples

Experimental program
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Embodiment 1

[0059] Such as figure 2 , the structure of the organic electrowhite light device in Example 1 has the following structural formula: Glass / ITO / NPB / NPB:(t-bt)2Ir(acac) / CBP / CBP:TPBi / BH:BD / Bebq2 / LiF / Al;

[0060] In Embodiment 1, the composite inner connection layer includes a bipolar connection layer 51 and a bipolar doped connection layer 52 arranged from bottom to top;

specific Embodiment approach

[0061] According to a specific implementation mode, the preparation method of the white organic electroluminescent device of the present embodiment is as follows:

[0062] The transparent conductive substrate ITO glass was ultrasonically cleaned with ethanol solution, acetone solution and deionized water, and dried with high-purity dry nitrogen after cleaning. Wherein the ITO film on the glass substrate is used as the anode conductive layer of the device, the square resistance of the ITO film is 10Ω-50Ω, and the film thickness is 100nm-200nm.

[0063] The dried ITO glass was moved into the pretreatment chamber, and the backplane was subjected to oxygen plasma treatment for 5 minutes under an environment with an oxygen partial pressure of 25Pa, and the power was 100W.

[0064] Place the above-mentioned cleaned and pretreated ITO glass in a vacuum chamber, and evacuate to 5×10 -4 Pa, and then vapor-deposit a layer of hole-transporting material NPB on the above-mentioned ITO fil...

Embodiment 2

[0084] Such as image 3 As shown, the structure of the organic electrowhite light device in Example 2 has the following structural formula: Glass / ITO / NPB / NPB:(t-bt)2Ir(acac) / CBP:TPBi / CBP / BH:BD / Bebq2 / LiF / Al;

[0085] In Embodiment 2, the composite inner connection layer includes a bipolar doped connection layer 52 and a bipolar connection layer 51 arranged from bottom to top;

[0086] The structure of the composite connection layer in Embodiment 2 is a double-layer structure, and the bipolar doped connection layer 52 is composed of a bipolar transmission material CBP doped with a unipolar transmission material TPBi, and is close to the first yellow light layer. side; the bipolar connection layer 51 is an auxiliary transition layer composed of CBP, which is close to the blue light side.

[0087] The preparation method of the device of embodiment 2 is similar to that of embodiment 1, the difference is that: the bipolar connection layer 51 and the bipolar doped connection layer...

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Abstract

The invention provides a white organic electroluminescent device and a manufacturing method thereof. The white organic electroluminescent device comprises a cathode layer, an anode conducting layer and an organic layer which is clamped between the cathode layer and the anode conducting layer, wherein the organic layer comprises a phosphorescent luminous layer and a fluorescent luminous layer; the luminous color of the phosphorescent luminous layer is different from that of the fluorescent luminous layer; and a composite inner connecting layer is arranged between the phosphorescent luminous layer and the fluorescent luminous layer. The manufacturing method of the white organic electroluminescent device comprises the following steps of sequentially forming the anode conducting layer, the organic layer and the cathode layer on a substrate from bottom to top, wherein the organic layer comprises the phosphorescent luminous layer and the fluorescent luminous layer, and the luminous color of the phosphorescent luminous layer is different from that of the fluorescent luminous layer; and forming the composite inner connecting layer between the phosphorescent luminous layer and the fluorescent luminous layer. By adopting the white organic electroluminescent device and the manufacturing method thereof, the illuminating efficiency can be improved and the color stability can be ensured.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to a white organic electroluminescence device and a manufacturing method thereof. Background technique [0002] Since white organic light-emitting devices (WOLEDs) were proposed, the research on WOLEDs has become one of the hot research directions in the field of organic light-emitting due to its broad application potential in the field of lighting and display. [0003] After nearly 20 years of development, the performance and theoretical research of white organic electroluminescent devices have made great progress. However, most of the previous device preparations use fluorescent light-emitting materials, and only 25% of excitons in fluorescent light-emitting materials ( Singlet state) participates in luminescence, which limits the improvement of the efficiency of the entire device. In order to break through this limitation, phosphorescent materials in which both singlet ...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/56
CPCH01L51/5012H01L51/50H01L51/5044H01L51/5016H10K50/131H10K50/11H10K2101/10
Inventor 朱儒晖于军胜
Owner BOE TECH GRP CO LTD
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