Crosslinking Agent Compound for Organic Light Emitting Device Hole Transport Region

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Solution Overview

Problem

Current organic light emitting devices face challenges in achieving high emission efficiency and low driving voltage, particularly in the development of materials for the hole transport region that can be effectively formed through a wet process.

Innovation Solution

The use of a crosslinking agent compound represented by Formula 1, which includes a bis-azide structure and a polyacetylene main chain, is integrated into the hole transport region, allowing for improved hole transport properties and emission efficiency when thermally or photo-crosslinked with a polymer compound, specifically through a wet process like ink jet printing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional hole transport layer materials are used, then the device can be manufactured with simple processes, but the emission efficiency is low and driving voltage is high

Engineering Contradiction:

Improveemission efficiencyVSAvoidmanufacturing process complexity

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent employs composite materials by combining polymer compounds with crosslinking agent compounds to form the hole transport layer. This composite approach enables improved emission efficiency and reduced driving voltage while maintaining ease of manufacture through wet process deposition methods.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If conventional hole transport materials are used, then the manufacturing process is simple, but the device resolution and performance are insufficient

Engineering Contradiction:

Improvedevice resolutionVSAvoidmaterial structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent utilizes parameter changes by introducing crosslinking agent compounds that undergo thermal or photo-crosslinking reactions. This transformation changes the physical and chemical parameters of the hole transport layer, improving device resolution and performance while the crosslinking process can still be integrated into existing wet manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If non-crosslinked hole transport materials are used, then the manufacturing process is straightforward, but the hole transport capacity and emission efficiency are limited

Engineering Contradiction:

Improveforming process efficiencyVSAvoidhole transport capacity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by incorporating crosslinking agent compounds into the hole transport layer formulation before deposition. The crosslinking reaction is then activated through thermal or photo treatment during or after the wet process deposition, thereby preliminarily enhancing the hole transport capacity and emission efficiency before the device begins operation.

Inventive Principle:

Principle #10Preliminary action

4Loss of energy

If high-performance hole transport materials are used, then emission efficiency improves, but the driving voltage increases

Engineering Contradiction:

Improveemission efficiencyVSAvoiddriving voltage

Core Design Contradiction:

Loss of energyVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by optimizing the hole transport layer's properties through crosslinking, which locally enhances charge transport capability at the interface with the emission layer. This localized improvement in hole transport efficiency reduces the overall driving voltage requirement while maintaining high emission efficiency, as the crosslinked regions provide optimal charge transport pathways where most critical.

Inventive Principle:

Principle #3Local quality

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 approach results in an organic light emitting device with enhanced resolution, high emission efficiency, and reduced driving voltage, maintaining the hole transport capacity and improving the forming process efficiency.

Implementation Method 1

when thermally or photo-crosslinked with a polymer compound

Methodology Applied

Scientific EffectThermal crosslinking:

Implementation Method 2

when thermally or photo-crosslinked with a polymer compound

Methodology Applied

Scientific EffectPhoto-crosslinking: Photopolymerisation

Data Source

PatentUS11780790B2Organic light emitting device, crosslinking agent compound for organic light emitting device and manufacturing method of the organic light emitting device

Publication Date: 2023.10.10 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting device of an embodiment of the present disclosure includes a first electrode, a hole transport region, an emission layer, an electron transport region, and a second electrode, stacked one by one, wherein the hole transport region includes a hole transport material derived from a crosslinking agent compound represented by Formula 1. The organic light emitting device may be manufactured through a wet process, and the emission efficiency and driving voltage properties of the organic light emitting device may be improved.