Indolocarbazole Derivatives for OLED Luminous Efficiency

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Solution Overview

Problem

Current organic electroluminescent devices face challenges in achieving high efficiency and long-lasting performance due to suboptimal structural designs and materials in their organic layers, particularly in enhancing luminous efficiency and color purity.

Innovation Solution

The development of indolocarbazole derivatives for use in organic electroluminescent devices, specifically in the form of Formula A, which are integrated into the device's organic layers to improve efficiency and longevity, and can be combined with other compounds to form various layers, including capping layers, to enhance luminous efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic layer materials and structures are used, then device fabrication is simpler, but luminous efficiency and lifetime are insufficient

Engineering Contradiction:

Improveluminous efficiencyVSAvoidstructural complexity of organic layers

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent modifies the chemical structure of organic layer materials by introducing specific functional groups and molecular configurations to optimize electron transport properties, hole transport properties, and energy level alignment, thereby achieving higher luminous efficiency and device lifetime

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite organic layer structures combining multiple materials with complementary functions (electron transport materials, hole transport materials, emission materials) to achieve synergistic effects that improve overall device performance beyond what single materials can provide

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If conventional organic layer materials are used, then manufacturing is easier, but device lifetime is short

Engineering Contradiction:

Improvedevice lifetimeVSAvoidease of manufacturing organic layers

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent optimizes material parameters including HOMO/LUMO energy levels, mobility, and stability characteristics to enhance device lifetime while maintaining compatibility with existing manufacturing processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops organic layer materials that can be deposited using conventional vacuum deposition and solution processing techniques, avoiding the need for complex or expensive specialized manufacturing equipment

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Illumination intensity

If conventional materials are used in organic layers, then device structure is simpler, but color purity is insufficient

Engineering Contradiction:

Improvecolor purityVSAvoidcomplexity of organic layer composition

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent introduces specific functional groups and molecular structures in targeted positions within the organic layer to control emission characteristics and achieve high color purity without requiring complete redesign of the entire device structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent combines emission materials with specific host materials and auxiliary compounds to achieve precise color control through energy transfer mechanisms while maintaining overall structural simplicity

Inventive Principle:

Principle #40Composite materials

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 indolocarbazole derivatives significantly improve the luminous efficiency and extend the lifetime of organic electroluminescent devices by optimizing the structural and material properties of the organic layers, leading to enhanced performance in terms of voltage, current, luminance, and color stability.

Implementation Method 1

electrons injected from an electron injecting electrode (cathode) recombine with holes injected from a hole injecting electrode (anode) in a light emitting layer to form excitons, which emit light while releasing energy

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11456428B2Indolocarbazole derivatives and organic electroluminescent devices using the same

Publication Date: 2022.09.27 SFC CO LTD

AI summary

Disclosed are indolocarbazole polycyclic aromatic derivatives that can be employed in various organic layers of organic electroluminescent devices. The indolocarbazole derivatives have a boron-containing structure. Also disclosed are organic electroluminescent devices including the indolocarbazole derivatives. The organic electroluminescent devices are highly efficient and long lasting and have greatly improved luminous efficiency.