OLED Electron Transporting Layer with Carbazole Derivative

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Solution Overview

Problem

Conventional organic electro-luminescence devices suffer from energy wastage due to ineffective combination of electrons and holes, requiring a complex manufacturing process with an additional hole blocking layer to improve efficiency and color reproduction.

Innovation Solution

An organic electro-luminescence device structure that includes a substrate, a first electrode layer, a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer with carbazole derivative and n-type material, and a second electrode layer, which effectively blocks holes without the need for an extra hole blocking layer, simplifying the manufacturing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a hole blocking layer is added to block holes from moving toward the cathode layer, then electron and hole combination effectiveness is improved, but manufacturing process complexity increases

Engineering Contradiction:

Improveenergy wastingVSAvoidmanufacturing process complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent combines the hole blocking function with the electron transporting layer by incorporating carbazole derivative and n-type material into the same layer. This merging eliminates the need for a separate hole blocking layer while maintaining the ability to block holes effectively, thus reducing manufacturing process complexity while preventing energy waste.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The electron transporting layer is designed to perform multiple functions: transporting electrons and blocking holes. By making this layer universal in its functionality through the specific material combination, the device structure is simplified without compromising the effectiveness of hole blocking and energy efficiency.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of energy

If a hole blocking layer is added to improve electron and hole combination, then luminous efficiency is improved, but device structure becomes more complex

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddevice structure complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent merges the hole blocking capability into the electron transporting layer through the use of carbazole derivative and n-type material. This consolidation maintains high luminous efficiency by ensuring effective electron and hole combination in the light emitting layer while avoiding the need for an additional structural layer, thus simplifying the overall device structure.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If conventional electron transporting layer is used without carbazole derivative, then manufacturing process is simpler, but hole blocking effectiveness is reduced

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidhole blocking effectiveness

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent changes the material parameters of the electron transporting layer by incorporating carbazole derivative and n-type material. This parameter change modifies the layer's properties to enable effective hole blocking while maintaining a relatively simple manufacturing process, as the materials can be deposited using conventional vacuum deposition techniques without requiring additional process steps.

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

This configuration enhances luminance, luminous efficiency, and color reproduction while simplifying the manufacturing process by eliminating the need for an additional hole blocking layer, resulting in improved performance and reduced complexity.

Implementation Method 1

The electron transporting layer includes carbazole derivative and n-type material

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 2

The combination of an electron and a hole in the light emitting layer 19 transforms electric energy into photon energy. As a result, light 29 is released

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS7914906B2Organic electro-luminescence device

Publication Date: 2011.03.29 AU OPTRONICS CORP

AI summary

An organic electro-luminescence device includes a substrate, the first electrode layer, a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, an electron injecting layer and the second electrode layer. The first electrode layer is formed over the substrate. The hole injecting layer is formed over the first electrode layer. The hole transporting layer is formed over the hole injecting layer. The light emitting layer is formed over the hole transporting layer. The electron transporting layer is formed over the light emitting layer. The electron transporting layer includes carbazole derivative and n-type material. The electron injecting layer is formed over the electron transporting layer. The second electrode layer is formed over the electron injecting layer.