OLED Emission Layer and Hole-Transporting Region Material Design

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Solution Overview

Problem

Current organic light-emitting devices (OLEDs) face challenges in achieving optimal performance due to limitations in the materials used for the emission layer and hole-transporting region, which affect the device's efficiency and brightness.

Innovation Solution

The development of an organic light-emitting device with a specific emission layer and hole-transporting region structure, utilizing light-emitting materials and hole-transporting materials represented by specific chemical formulas, enhancing the device's efficiency and brightness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional materials are used for the emission layer and hole-transporting region, then the device structure is simpler, but the efficiency and brightness are insufficient

Engineering Contradiction:

Improvematerial selection simplicityVSAvoiddevice efficiency and brightness

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent modifies the chemical structure parameters of the emission layer and hole-transporting region materials by introducing specific molecular weight ranges and functional group configurations, thereby improving device efficiency and brightness while maintaining manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by combining specific emission materials with hole-transporting materials in defined layers, creating a multi-component system that achieves superior optical performance compared to conventional single-material approaches

Inventive Principle:

Principle #40Composite materials

2Productivity

If optimized emission layer and hole-transporting region are implemented, then efficiency and brightness improve, but the device complexity increases

Engineering Contradiction:

Improvedevice efficiency and brightnessVSAvoidemission layer and hole-transporting region structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the organic light-emitting device into distinct functional layers, specifically separating the emission layer and hole-transporting region with defined thicknesses and material compositions, allowing independent optimization of each layer's properties to achieve overall device performance improvement

Inventive Principle:

Principle #1Segmentation

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 proposed structure improves the efficiency and brightness of OLEDs by optimizing the emission layer and hole-transporting region, leading to better performance and potentially longer device lifespan.

Implementation Method 1

an emission layer disposed between the first electrode and the second electrode

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10158086B2Organic light-emitting device

Publication Date: 2018.12.18 SAMSUNG DISPLAY CO LTD

AI summary

Provided is an organic light-emitting device including a first electrode; a second electrode disposed opposite to the first electrode; an emission layer disposed between the first electrode and the second electrode, the emission layer including at least one specific light-emitting material; and a hole-transporting region disposed between the first electrode and the emission layer, the hole-transporting region including at least one specific hole-transporting material.