Unlock instant, AI-driven research and patent intelligence for your innovation.

Laminated organic electroluminescent device and preparation method thereof

A technology for electroluminescent devices and electroluminescent layers, which is applied in the fields of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc., and can solve the problems of low luminous efficiency of light-emitting devices, limited electron and hole regeneration capabilities, etc.

Inactive Publication Date: 2012-12-05
OCEANS KING LIGHTING SCI&TECH CO LTD +1
View PDF2 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more studies are made on the use of n-type and p-type doped layers as charge generation layers (such as n-type (Alq 3 : Li) and p-type (NPB: FeCl 3 )) is formed by sequentially connecting a plurality of light-emitting units, but this charge generation layer has a limited ability to regenerate electrons and holes, and the luminous efficiency of the stacked organic electroluminescent device using this charge generation layer is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Laminated organic electroluminescent device and preparation method thereof
  • Laminated organic electroluminescent device and preparation method thereof
  • Laminated organic electroluminescent device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] Such as figure 2 The preparation method of the above-mentioned laminated organic electroluminescence device includes the following steps.

[0044] S10, providing an anode.

[0045] S20, forming two organic electroluminescent layers and a charge generation layer between the two organic electroluminescent layers by vapor deposition on one surface of the anode.

[0046] Taking two organic electroluminescent layers and one charge generating layer as an example, the organic electroluminescent layer, the charge generating layer and the organic electroluminescent layer are sequentially evaporated on one surface of the anode to form the organic electroluminescent layer.

[0047] The charge generation layer includes the following structures stacked in sequence: an n-type doped layer, a bipolar metal oxide layer and a p-type doped layer, and the n-type doped layer is closer to the anode than the p-type doped layer.

[0048] The material of the n-type doped layer is an electron...

Embodiment 1

[0055] Use indium tin oxide glass (ITO) as the anode, and sequentially evaporate the hole injection layer on the anode: the material is MoO 3 , the thickness is 40nm, the hole transport layer: the material is NPB, the thickness is 40nm, the light emitting layer: the material is Alq 3 , a thickness of 20nm and an electron transport layer: the material is Bphen, and the thickness is 60nm to obtain a first organic electroluminescent layer comprising a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer. Then evaporate the n-type doped layer, the material is doped with Cs 2 CO 3 Bphen, the thickness is 7nm, where Cs 2 CO 3 The doping ratio is 40%. Then evaporate the bipolar metal oxide layer, the material is MoO 3 , with a thickness of 5 nm. Finally, a p-type doped layer is evaporated, made of m-MTDATA doped with F4-TCNQ, with a thickness of 10nm, and the doping ratio of F4-TCNQ is 2%. Then continue to vapor-deposit the secon...

Embodiment 2

[0057] Use fluorine-containing tin oxide glass (FTO) as the anode, and sequentially evaporate the hole injection layer on the anode: the material is MoO 3 , the thickness is 40nm thick, the hole transport layer: the material is NPB, the thickness is 40nm, the light emitting layer: the material is Alq 3 The thickness is 20nm and the electron transport layer: the material is Bphen, the thickness is 60nm, and the first organic electroluminescent layer including the hole injection layer, the hole transport layer, the light emitting layer and the electron transport layer is obtained. Then evaporate the n-type doped layer, the material is doped with Cs 2 CO 3 Bphen, the thickness is 15nm, where Cs 2 CO 3 The doping ratio is 40%. Then evaporate the bipolar metal oxide layer, the material is MoO 3 , with a thickness of 5 nm. Finally, a p-type doped layer was evaporated, made of m-MTDATA doped with F4-TCNQ, with a thickness of 15nm, and the doping ratio of F4-TCNQ was 2%. Then c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a laminated organic electroluminescent device which comprises an anode, a cathode, two organic electroluminescent layers and a charge generation layer, wherein the charge generation layer is positioned between the two organic electroluminescent layers which are positioned between the anode and the cathode. The charge generation layer comprises an n-type doped layer, a bipolar metal oxide layer and a p-type doped layer, wherein the bipolar metal oxide layer has an electron generation capacity and a hole generation capacity simultaneously, and the n-type doped layer is closer to the anode than the p-type doped layer. The bipolar metal oxide layer has functions of n-type materials and p-type materials simultaneously and can generate holes and electrons concurrently, so that hole and electron generation of the charge generation layer can be further guaranteed, efficiency of the laminated organic electroluminescent device can be improved, and application of the laminated device is facilitated. The invention further provides a preparation method of the laminated organic electroluminescent device.

Description

【Technical field】 [0001] The invention relates to the field of electroluminescence, in particular to a stacked organic electroluminescence 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 high-brightness, high-efficiency double-layer organic electroluminescent device (OLED) was prepared by using ultra-thin film technology. In this double-layer structure device, the brightness reaches 1000cd / m at 10V 2 , the luminous efficiency is 1.51lm / W, and the 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 occupied orbital (HOMO) of organic matter. Electrons and holes ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01L51/50H01L51/54H01L51/56
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD