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A kind of organic electroluminescence device and preparation method thereof

An electroluminescent device, an organic metal technology, applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve problems such as limiting the selection of cathode materials, and achieve the effect of low driving voltage and high efficiency

Active Publication Date: 2017-08-25
BEIJING VISIONOX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technology to improve the electron injection efficiency, it is necessary to limit the material of the cathode connected to the electron transport layer. The cathode material needs a metal that can reduce the metal ions in the organic complex to the corresponding metal in a vacuum. , which limits the choice of cathode material

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  • A kind of organic electroluminescence device and preparation method thereof

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Embodiment 1

[0036] ITO(150nm) / NPB(50nm) / Alq 3 (50nm) / Bebq 2 (15nm):Alq 3 (100%): Li 3 N(100%) / Al(150nm)

[0037] Among them, the anode is ITO; the material of the hole transport layer is NPB, the thickness is 50nm; the material of the organic light-emitting layer is Alq 3, with a thickness of 50nm; the material constituting the electron transport layer is Bebq 2 , and doped with Alq 3 (organometallic complex) and Li 3 N (alkali metal nitride), the total thickness of the electron transport layer is 45nm, Alq 3 and Li 3 N relative to Bebq 2 Calculated as molar ratio respectively, namely Bebq 2 、Alq 3 , Li 3 The molar ratio between the three materials of N is 1:1:1; the cathode material is Al, and the thickness is 150nm.

[0038] The preparation method of the organic electroluminescent device of this embodiment is as follows:

[0039] 1) Etch and fix the anode pattern on the ITO substrate according to the design;

[0040] 2) Clean the etched ITO glass substrate with a fixed pat...

Embodiment 2

[0046] Prepare the following device according to the preparation method of the organic electroluminescent device of Example 1:

[0047] ITO(150nm) / NPB(50nm) / Alq 3 (50nm) / Bphen(15nm):Alq 3 (100%): Li 3 N(100%) / Al(150nm)

[0048] Among them, the anode is ITO (indium tin oxide); the material of the hole transport layer is NPB with a thickness of 50nm; the material of the organic light-emitting layer is Alq 3 , with a thickness of 50nm; the material constituting the electron transport layer is Bphen, and doped with Alq 3 (organometallic complex) and Li 3 N (alkali metal nitride), the thickness of the electron transport layer is 45nm, Alq 3 and Li 3 N relative to Bebq 2 Calculated as molar ratio respectively, namely Bphen, Alq 3 , Li 3 The molar ratio between the three materials of N is 1:1:1; the cathode material is Al, and the thickness is 150nm.

Embodiment 3

[0050] ITO(150nm) / NPB(50nm) / Alq 3 (50nm) / Bphen(15nm):Alq 3 (100%): KBH 4 (50%) / Al(150nm)

[0051] Among them, the anode is ITO (indium tin oxide); the material of the hole transport layer is NPB with a thickness of 50nm; the material of the organic light-emitting layer is Alq 3 , with a thickness of 50nm; the material constituting the electron transport layer is Bphen, and doped with Alq 3 (organometallic complex) and KBH 4 (alkali metal borohydride), the thickness of the electron transport layer is 35nm, Alq 3 and Li 3 N relative to Bebq 2 Calculated as molar ratio % respectively, that is, Bphen and Alq 3 , Li 3 The molar ratio between the three materials of N is 1:1:0.5; the cathode material is Al, and the thickness is 150nm.

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Abstract

The invention discloses an organic electroluminescent device and a preparation method thereof. The organic electroluminescent device comprises an anode, a hole transport layer, an organic light-emitting layer, an electron transport layer and a cathode, and the electron transport layer is doped with an organic metal complex and an active metal compound, wherein the active metal The compound is an alkali metal compound, an alkaline earth metal compound or a lanthanide metal compound. The preparation method is as follows: sequentially etching the anode pattern, vapor-depositing the hole transport layer and the organic light-emitting layer on the ITO glass substrate; co-evaporating electron-transport materials, organometallic complexes, active metal compounds , forming an electron transport layer; evaporating a cathode on the electron transport layer. The invention can obtain a cathode structure with lower driving voltage and higher efficiency, and can use more extensive materials as the cathode.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to an organic electroluminescence device and a preparation method thereof. Background technique [0002] Organic electroluminescent devices (OLEDs) are actively light emitting devices. Compared with the current mainstream flat-panel display technology Thin Film Transistor Liquid Crystal Display (TFT-LCD), OLED has the advantages of high contrast, wide viewing angle, low power consumption, and thinner volume. It is expected to become the next-generation flat-panel display technology after LCD. It is one of the most concerned technologies in flat panel display technology. [0003] An OLED device generally consists of an anode, a hole transport layer (HTL), a light emitting layer (EL), an electron transport layer (ETL) and a cathode. Among them, in the prior art, the electron transport layer often uses a single organic material, but OLED devices prepared with a si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56H01L51/54
CPCH10K85/321H10K50/165H10K2102/00H10K71/164H10K85/322H10K85/324H10K85/351H10K85/30H10K85/326H10K85/633H10K50/11H10K50/15H10K50/81H10K50/82H10K71/00H10K71/621H10K85/626
Inventor 邱勇段炼李梦真张国辉刘嵩
Owner BEIJING VISIONOX TECH