Electron Shower Treatment for OLED Hole Injection Layer

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Solution Overview

Problem

Organic electroluminescent devices face performance deterioration and reduced electrical surface resistance due to surface impurities in the hole injection layer, which are not effectively addressed by existing technologies.

Innovation Solution

An electron shower treatment is applied to the hole injection layer using a side electron shower method with an electron energy of 10 eV to 100 eV, combined with a nitrogen atmosphere blowing treatment and heating under vacuum, to remove impurities and stabilize the surface, thereby enhancing the interfacial resistance and performance of the device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hole injection materials are used for a hole injection layer without separate treatment, then the device structure remains simple and manufacturing process is straightforward, but surface impurities cause deterioration in performance and reduction in electrical surface resistance

Engineering Contradiction:

Improveperformance and service lifeVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

An electron shower treatment is performed on the hole injection layer before subsequent layer deposition to remove surface impurities and stabilize the surface. This preliminary treatment prevents performance deterioration and maintains electrical surface resistance without requiring complex post-processing steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The electron shower acts as an intermediary treatment between substrate preparation and organic layer deposition. It mediates the surface condition by removing impurities and stabilizing the hole injection layer surface, ensuring optimal interfaces for subsequent layers without adding mechanical complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If no electron shower treatment is applied to the hole injection layer, then the manufacturing process remains simple, but electrical surface resistance decreases and performance deteriorates due to surface impurities

Engineering Contradiction:

Improveservice lifeVSAvoidmanufacturing simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The electron shower treatment is applied as a preliminary step to the hole injection layer formation process. This treatment removes surface impurities and stabilizes the surface in advance, preventing future performance deterioration and extending service life while maintaining manufacturing simplicity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The electron shower treatment replaces complex mechanical cleaning or chemical treatment methods. It uses electron beam energy to remove impurities and stabilize the surface through non-contact energy deposition, simplifying the manufacturing process while improving reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If the hole injection layer surface is not treated, then the device structure remains simple, but surface impurities reduce electrical surface resistance and cause performance deterioration

Engineering Contradiction:

Improvesurface qualityVSAvoidprocess steps

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The electron shower treatment is performed as a preliminary step to establish a clean, stable surface on the hole injection layer. This preliminary action removes impurities and stabilizes the surface before subsequent layer deposition, ensuring high manufacturing precision without adding significant process complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The electron shower treatment changes the surface parameters of the hole injection layer by removing impurities and stabilizing the surface. This parameter change improves surface quality and electrical surface resistance while maintaining a relatively simple process structure

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The electron shower treatment effectively removes impurities, stabilizes the conductive polymer surface, and increases the electrical surface resistance of the hole injection layer, leading to improved performance and extended service life of the organic electroluminescent device.

Implementation Method 1

performing an electron shower treatment to remove impurities from the hole injection layer

Methodology Applied

Scientific EffectElectron shower treatment: Electron Beam

Implementation Method 2

heating under vacuum, to remove impurities and stabilize the surface

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS7485481B2Organic electroluminescent device comprising electron shower treated hole injection layer and method for preparing the same

Publication Date: 2009.02.03 SAMSUNG DISPLAY CO LTD

AI summary

An organic electroluminescent device has an anode formed on a substrate, a hole injection layer formed on the anode, wherein the hole injection layer is subjected with an electron shower treatment, an emitting layer formed on the hole injection layer, and a cathode formed on the emitting layer. With the electron shower treatment, impurities from the hole injection layer can be removed, and electrical surface resistance of the hole injection layer cab be increased so that performance and life characteristics of the organic electroluminescent device are improved.