Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Stacked organic light emitting device and preparation method thereof

An electroluminescent device, organic technology, applied in the direction of organic semiconductor devices, electro-solid devices, semiconductor/solid-state device manufacturing, etc. The problem of low luminous efficiency, etc., can improve the hole transport rate, avoid the existence of electron traps, and improve the effect of light scattering.

Inactive Publication Date: 2014-09-10
OCEANS KING LIGHTING SCI&TECH CO LTD +2
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to improve luminous brightness and luminous efficiency, more and more researches are based on stacked devices. This structure usually uses the charge generation layer as a connecting layer to connect several light-emitting units in series. Compared with unit devices, Stacked structure devices often have doubled current efficiency and luminous brightness. At present, most of the research is to use 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, which is not conducive to the further application of stacked organic electroluminescent devices
At the same time, the preparation of this charge generation layer requires at least two procedures, which brings certain complexity to the preparation.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for preparing a laminated organic electroluminescent device, comprising the following steps:

[0054] (1) The anode is made of ITO glass. First, the anode is photolithographically processed and cut into 2×2cm 2 Then use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate for 15 minutes each to remove organic pollutants on the glass surface. After cleaning, air-dry; A hole transport layer, a first light-emitting layer, a first electron transport layer, and the material of the hole injection layer is MoO 3 , the thickness is 40nm, and the evaporation pressure is 5×10 -3 Pa, the evaporation rate is 1nm / s; the material of the first hole transport layer is NPB, the thickness is 30nm, and the material of the first light-emitting layer is Alq 3 , the thickness is 10nm, the material of the first electron transport layer is TAZ, the thickness is 180nm, the evaporation conditions of the first hole transport layer, the first light-emitting layer an...

Embodiment 2

[0060] A method for preparing a laminated organic electroluminescent device, comprising the following steps:

[0061] (1) The anode is made of AZO glass. First, the anode is subjected to photolithography treatment, and then cut into 2×2cm 2 Then use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate for 15 minutes each to remove organic pollutants on the glass surface. After cleaning, air-dry; A hole transport layer, the first light-emitting layer, the first electron transport layer, and the material of the hole injection layer is V 2 o 5 , the thickness is 80nm, and the evaporation pressure is 2×10 -4 Pa, the evaporation rate is 10nm / s; the material of the first hole transport layer is NPB, the thickness is 60nm, the material of the first light-emitting layer is ADN, the thickness is 5nm, the material of the first electron transport layer is TPBI, the thickness is 40nm, The evaporation conditions of the first hole transport layer, the first light-emi...

Embodiment 3

[0067] A method for preparing a laminated organic electroluminescent device, comprising the following steps:

[0068] (1) The anode is made of IZO glass. First, the anode is photolithographically processed and cut into 2×2cm 2 Then use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate for 15 minutes each to remove organic pollutants on the glass surface. After cleaning, air-dry; A hole transport layer, a first light-emitting layer, a first electron transport layer, and the material of the hole injection layer is MoO 3 , the thickness is 20nm, and the evaporation pressure is 1×10 -3 Pa, the evaporation rate is 5nm / s; the material of the first hole transport layer is TAPC, the thickness is 30nm, the material of the first light-emitting layer is DCJTB, the thickness is 10nm, the material of the first electron transport layer is Bphen, the thickness is 200nm, The vapor deposition conditions of the first hole transport layer, the first light-emitting layer...

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

No PUM Login to View More

Abstract

The invention discloses a stacked organic light emitting device and a preparation method thereof. The stacked organic light emitting device comprises an anode, a hole injection layer, a first hole transport layer, a first light emitting layer, a first electron transport layer, a charge generation layer, a second hole transport layer, a second light emitting layer, a second electron transport layer, an electron injection layer and a cathode which are sequentially stacked. The charge generation layer comprises a metal oxide layer, an n-type doped layer and a metal oxide doped layer which are sequentially stacked. The metal oxide layer can improve the electron transport rate. The n-type doped layer can provide electrons and holes at the same time, and improves the stability and light scattering effect of the charge generation layer. The metal oxide doped layer improves the hole transport rate, and meanwhile, the metal oxide is of an amorphous structure which can inhibit crystallization of polycrystalline hole transport materials and avoid the presence of electron traps. The invention further provides a preparation method of the stacked organic light emitting device.

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] 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) has been prepared using ultra-thin film technology. Brightness up to 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 occupied orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in t...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K85/631H10K2102/00H10K71/00
Inventor 周明杰王平黄辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products