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Stacked organic light emitting device and a preparation method thereof

An electroluminescent device, organic technology, applied in the direction of electro-solid device, semiconductor/solid-state device manufacturing, electrical components, etc. Luminous efficiency, the effect of ensuring transmittance

Inactive Publication Date: 2014-09-10
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stacked organic electroluminescent devices of the prior art generally utilize two or more materials with hole injection or electron injection as the charge generation layer (such as Cs:BCP / V 2 o 5 ), or n-type and p-type doped layers as charge generation layers (such as n-type (Alq 3 :Li) and p-type (NPB:FeCl 3 )), or Al-WO 3 - Au, etc. are connected in sequence with multiple light-emitting units, but the light transmittance and luminous efficiency of this device are low

Method used

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  • Stacked organic light emitting device and a preparation method thereof
  • Stacked organic light emitting device and a preparation method thereof

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preparation example Construction

[0094] In addition, the present invention also provides a method for preparing a laminated organic electroluminescent device, comprising the following steps:

[0095] Provide the required size anode, clean and dry;

[0096] sequentially evaporating a hole injection layer, a first hole transport layer, a first light emitting layer, and a first electron transport layer on the surface of the anode;

[0097] On the first electron transport layer, a metal oxide layer, a metal layer and a hole-doped layer are sequentially vapor-deposited to form a charge generation layer, and the material of the metal oxide layer is a metal oxide with a refractive index of 1.9-2.2 ; The material of the metal layer is silver, aluminum, platinum or gold; The material of the hole-doped layer is ferric chloride doped into benzidine organic hole transport material according to the mass ratio of 1-10:100 The mixed material composed in; the vapor deposition of the metal oxide layer, the metal layer and th...

Embodiment 1

[0133] A method for preparing a stacked organic electroluminescent device, comprising the steps of:

[0134] (1) The anode is made of indium tin oxide glass (ITO). First, the anode is photolithographically processed and cut into a square with a side length of 2mm, and then washed with detergent, deionized water, acetone, ethanol and isopropanol. Ultrasound for 15 minutes to remove organic pollutants on the glass surface, clean it and air-dry it; then vapor-deposit a hole injection layer, a first hole transport layer, a first light-emitting layer, and a first electron transport layer on the anode surface in sequence, wherein:

[0135] The hole injection layer is made of molybdenum trioxide (MoO 3 ), the evaporation pressure is 5×10 -3 Pa, the evaporation rate is 1nm / s, and the evaporation thickness is 30nm;

[0136] The material of the first hole transport layer is 1,1-bis[4-[N,N′-bis(p-tolyl)amino]phenyl]cyclohexane (TAPC), and the evaporation pressure is 5×10 -3 Pa, the ev...

Embodiment 2

[0155] A method for preparing a stacked organic electroluminescent device, comprising the steps of:

[0156] (1) The anode is made of aluminum zinc oxide glass (AZO). First, the anode is photolithographically processed and cut into a circle with a diameter of 1.2mm. Ultrasound for 15 minutes to remove organic pollutants on the glass surface, clean it and air-dry it; then vapor-deposit a hole injection layer, a first hole transport layer, a first light-emitting layer, and a first electron transport layer on the anode surface in sequence, wherein:

[0157] The hole injection layer is made of vanadium pentoxide (V 2 o 5 ), the evaporation pressure is 2×10 -4 Pa, the evaporation rate is 5nm / s, and the evaporation thickness is 80nm;

[0158] The material of the first hole transport layer is N,,N'-(1-naphthyl)-N,N'-diphenyl-4,4'-biphenylenediamine (NPB), and the evaporation pressure is 2× 10 -4 Pa, the evaporation rate is 0.5nm / s, and the evaporation thickness is 60nm;

[0159...

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Abstract

The invention discloses a stacked organic light emitting device and a preparation method thereof. The stacked organic light emitting device comprises a charge generating layer, and the charge generating layer includes a metal oxide layer, a metal layer and a hole doped layer which are sequentially stacked. The metal oxide layer is made of a metal oxide of which the refractive index is 1.9-2.2. The hole doped layer is made of a mixed material formed by doping ferric chloride into a benzidine organic hole transport material according to the weight ratio of 1-10:100. As the metal oxide layer, the metal layer and the hole doped layer which are sequentially stacked are used as the charge generating layer, the stacked organic light emitting device has high light transmittance, strong electron transport capability, high conductivity and strong hole injection and transport capability, and the light emitting efficiency of the stacked organic light emitting device is effectively improved.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to a stacked organic electroluminescence device and a preparation method thereof. Background technique [0002] Organic light-emitting devices (Organic light-emitting devices, referred to as OLEDs) is a multi-layer light-emitting device using organic light-emitting materials, including sequentially stacked anode layer, hole injection layer, hole transport layer, light-emitting layer, electron transport layer layer and cathode. The luminescent principle of OLED 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 occupied orbital (HOMO) of organic matter. The light-emitting layers meet, recombine, and form excitons. The excitons migrate under the action of the electric field and transfer energy to the light-emitt...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K71/166H10K50/11H10K2101/40H10K50/155
Inventor 周明杰王平黄辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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