Organic electroluminescent device with doping type electronic transmission layer structure

A technology of electron transport layer and electron transport material, which is applied in the field of OLED, can solve the problems of shortening the life of the device, and achieve the effects of long service life, simplified evaporation process, and high current efficiency

Active Publication Date: 2012-10-17
KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this invention adopts electron transport material with high HOMO energy level, the material of this kind of electron transport layer ETL structure has hole blocking performance, so this ETL structure is limited to phosphorescent OLED device, is conducive to improving the efficiency of phosphorescent device, but in fluorescent In the device, due to the accumulation of a large number of excitons and holes in the light-emitting layer, the lifetime of the device will be shortened

Method used

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  • Organic electroluminescent device with doping type electronic transmission layer structure
  • Organic electroluminescent device with doping type electronic transmission layer structure
  • Organic electroluminescent device with doping type electronic transmission layer structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Organic electroluminescent device structure:

[0069] ITO / m-MTDATA(170nm) / NPB(15nm) / MADN(45nm):DPVBi(5%) / ETL(25nm) / LiF(0.5nm) / Al(150nm)

[0070] The preparation method of the organic electroluminescent device is as follows:

[0071] (1) Processing the substrate

[0072] The glass plate coated with the ITO transparent conductive layer is ultrasonically treated in a cleaning agent, and rinsed with deionized water to complete the cleaning of the glass substrate; then ultrasonically treated in acetone: ethanol mixed solvent to remove oil ; drying in a clean environment, then cleaning with UV light and ozone, and bombarding the surface with a beam of low-energy cations to anodize the glass plate.

[0073] (2) Evaporation of light-emitting unit layer

[0074] ①Place the glass substrate with the anode in the vacuum chamber and evacuate to 1×10 －5 Pa, m-MTDATA was vacuum evaporated on the above anode layer as a hole injection layer (HIL), the evaporation rate was 0.15nm / s, ...

Embodiment 2

[0100] Organic electroluminescent device structure:

[0101] ITO / m-MTDATA(170nm) / NPB(15nm) / ADN(45nm):C545T(5%) / ETL(20nm) / LiF(0.5nm) / Al(150nm)

[0102] The preparation method is the same as in Example 1, except that the blue light-emitting layer in step ③ is replaced by a green light-emitting layer, and the thickness of the electron transport layer is 20 nm.

Embodiment 3

[0122] Organic electroluminescent device structure:

[0123] ITO / m-MTDATA(170nm) / NPB(15nm) / Bebq2(30nm):(piq) 2 Ir(acac)(5%) / ETL(15nm) / LiF(0.5nm) / Al(150nm)

[0124] The preparation method is the same as in Example 1, except that the blue light-emitting layer in step ③ is replaced by a red light-emitting layer, and the thickness of the electron transport layer is 15 nm.

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Abstract

The invention discloses an organic electroluminescent device, which comprises a basal plate, an anode layer, a hole injection layer, a hole transmission layer, a light-emitting layer, an electronic transmission layer and a cathode layer, wherein the anode layer, the hole injection layer, the hole transmission layer, the light-emitting layer, the electronic transmission layer and the cathode layer are sequentially formed on the basal plate; the electronic transmission layer is formed by mutually doping a planar electronic transmission material with a vertical electronic transmission material; and the mass ratio of the planar electronic transmission material and the vertical electronic transmission material is 9:1-1:9. The electronic transmission layer of the organic electroluminescent device has high transmission performance and good film forming ability. The organic electroluminescent device adopting the electronic transmission layer has high current efficiency and a long service life.

Description

technical field [0001] The invention relates to the field of OLEDs, in particular to an OLED device with a doped electron transport layer structure. Background technique [0002] Organic electroluminescent devices (OLEDs) are spontaneous light-emitting display devices that emit light by generating energy through the recombination of electrons and holes when an electric field is applied to a thin film formed of fluorescent or phosphorescent organic compounds, and provide suitable for There are many advantages of portable electronic devices, including light weight, simple structure, high color purity, perfect realization of moving pictures, low power consumption, low driving voltage, etc. [0003] Although OLEDs are a promising new technology in electronic displays, their short lifetime and low current efficiency limit their widespread application. At present, organic electroluminescent devices have been improved in service life and efficiency according to the materials used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54C09K11/06
Inventor 何麟邱勇黄秀颀陈红敖伟
Owner KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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