Condensed Cyclic Compound for OLED Solution Processing

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Solution Overview

Problem

Organic light-emitting devices (OLEDs) face challenges in achieving low driving voltage, high efficiency, high brightness, and long lifespan, with existing technologies struggling to optimize performance through conventional materials and manufacturing methods.

Innovation Solution

A condensed cyclic compound represented by Formula 1 is introduced, which is incorporated into the organic light-emitting device, providing high current efficiency and a long lifespan, and is suitable for use in solution processes, suppressing π-π stacking and aggregation, thereby enhancing film-forming properties and solubility, and improving charge transport capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional materials and vacuum deposition methods are used, then device performance can be achieved, but manufacturing cost increases and large-area production becomes difficult

Engineering Contradiction:

Improvemanufacturing cost and scalabilityVSAvoiddevice performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces the mechanical vacuum deposition system with a solution-based coating system. The condensed cyclic compound is dissolved in a solvent to form a solution, which is then applied to the substrate using solution coating methods. This substitution eliminates the need for expensive vacuum equipment and enables scalable large-area manufacturing while maintaining device performance through the specialized molecular structure of the compound.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical and chemical parameters of the organic compound by designing a specific condensed cyclic structure with controlled solubility and aggregation properties. The molecular structure parameters are optimized to ensure the compound remains stable and functional in solution form, enabling solution processing while maintaining the performance characteristics required for OLED operation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If solution processing is used, then manufacturing cost decreases and large-area production becomes feasible, but material solubility and aggregation control become critical challenges

Engineering Contradiction:

Improvemanufacturing efficiency and scalabilityVSAvoidmaterial structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing specific functional groups and substituents at particular positions on the condensed cyclic core structure. These localized structural modifications control the solubility and aggregation behavior of the compound in solution, enabling effective solution processing while maintaining the overall molecular integrity and device performance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite molecular structure combining a condensed cyclic core with various functional groups and substituents. This composite structure integrates the benefits of high performance (from the condensed core) with improved solubility and processability (from the functional groups), resolving the contradiction between productivity and device complexity.

Inventive Principle:

Principle #40Composite materials

3Use of energy by moving object

If driving voltage is reduced, then energy consumption decreases, but achieving high efficiency and long lifespan becomes more difficult

Engineering Contradiction:

Improvedriving voltage and energy consumptionVSAvoidefficiency and lifespan

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent changes the electronic parameters of the organic compound by designing the condensed cyclic structure with specific HOMO-LUMO energy levels and charge transport properties. These parameter optimizations enable the device to operate at lower driving voltages while maintaining high efficiency and long lifespan through improved charge injection and transport characteristics inherent to the molecular 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 use of the condensed cyclic compound in OLEDs results in improved current efficiency, extended lifespan, and enhanced manufacturing feasibility through solution coating, allowing for the production of high-performance OLEDs without the need for expensive vacuum deposition, making it suitable for large-area devices.

Implementation Method 1

suppressing π-π stacking and aggregation

Methodology Applied

Scientific Effectπ-π stacking:

Implementation Method 2

Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state, thereby generating light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11233200B2Condensed cyclic compound, composition including the same, and organic light-emitting device including the condensed cyclic compound

Publication Date: 2022.01.25 SAMSUNG ELECTRONICS CO LTD

AI summary

A condensed cyclic compound represented by Formula 1:wherein, in Formula 1, X11, X12, and R11 to R24 are the same as described in the specification.