Spiroindenonindene Condensed-Cyclic Compound for OLED Emission Efficiency

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Solution Overview

Problem

Current organic light-emitting devices face challenges in achieving high efficiency and long lifespan due to issues such as aggregation, concentration quenching, and broad emission spectra, which affect their luminance and durability.

Innovation Solution

A condensed-cyclic compound represented by Formula 1, which includes a spiroindenonindene group, is used in the organic light-emitting device's emission layer, providing a rigid structure that reduces steric hindrance, prevents aggregation, and enhances emission efficiency, resulting in a narrow emission spectrum and improved luminance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic light-emitting materials are used, then device structure is simple, but aggregation occurs leading to concentration quenching and broad emission spectra

Engineering Contradiction:

Improveemission efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the molecular structure parameters by introducing a spiroindenonindene group with specific structural characteristics (rigid backbone, bulky shape, sp3 hybridized carbon). This structural parameter change prevents aggregation by creating steric hindrance and reducing molecular planarity, thereby eliminating concentration quenching while maintaining emission efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure by combining the spiroindenonindene core group with various substituent groups (Formula 1). This composite approach allows the molecule to inherit the aggregation-preventing properties of the spiroindenonindene group while adding functional properties through substituents, resolving the contradiction between emission efficiency and structural complexity.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If conventional organic light-emitting materials are used, then manufacturing process is simple, but concentration quenching reduces luminance and durability

Engineering Contradiction:

ImproveluminanceVSAvoidmaterial synthesis complexity

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent modifies the molecular parameters by incorporating the spiroindenonindene group which changes the physical and chemical properties of the material. This parameter change prevents concentration quenching, thereby improving luminance and durability, while the modular structure (Formula 1) facilitates systematic material development.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the molecular structure into a core spiroindenonindene group and separate substituent positions (Formula 1). This segmentation allows independent optimization of different molecular properties and simplifies the systematic development of new materials with improved luminance characteristics.

Inventive Principle:

Principle #1Segmentation

3Productivity

If conventional organic light-emitting materials are used, then device structure is simple, but broad emission spectra reduce emission efficiency

Engineering Contradiction:

Improveemission efficiencyVSAvoidcompound structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the structural parameters by introducing the rigid spiroindenonindene group with sp3 hybridized carbon atoms. This parameter change creates steric hindrance and reduces molecular planarity, preventing aggregation and concentration quenching, which narrows the emission spectrum and improves emission efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops composite molecules with the spiroindenonindene core and various substituents (Formula 1), allowing the material to achieve narrow emission spectra through the core structure while maintaining tunable properties through substituents, thereby improving emission efficiency without excessive complexity.

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 use of the condensed-cyclic compound leads to enhanced efficiency, high luminance, and extended lifespan of organic light-emitting devices by minimizing aggregation and concentration quenching, while maintaining blue emission with high efficiency.

Implementation Method 1

providing a rigid structure that reduces steric hindrance, prevents aggregation, and enhances emission efficiency

Methodology Applied

Scientific EffectSteric hindrance:

Implementation Method 2

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

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10090474B2Condensed-cyclic compound and organic light-emitting device including the same

Publication Date: 2018.10.02 SAMSUNG DISPLAY CO LTD

AI summary

A condensed-cyclic compound and an organic light-emitting device including the same, the compound being represented by Formula 1