Condensed Cyclic Compound for OLED Emission Efficiency

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Solution Overview

Problem

Current organic light-emitting devices (OLEDs) face limitations in achieving high emission efficiency and long lifetime due to the lack of materials with sufficient π-electrons and optimal molecular structure for improved transition probabilities.

Innovation Solution

A condensed cyclic compound represented by Formula 1 is introduced, which includes a core with oxygens in symmetrical positions, providing extra electrons and enhancing π-electron richness, thereby improving emission efficiency when used in the organic light-emitting device's electron transport region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic materials are used in OLEDs, then the device structure is simple, but the emission efficiency is low due to insufficient π-electrons and suboptimal molecular structure

Engineering Contradiction:

Improveemission efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the molecular parameters by introducing a condensed cyclic core structure with oxygen atoms at symmetrical positions (Formula 1). This structural parameter change increases π-electron richness and improves transition probabilities, directly enhancing emission efficiency while maintaining reasonable molecular complexity through systematic design

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite molecular structures by combining the condensed cyclic core (with oxygen atoms) with various substituent groups (L1, L2, R1-R4). This composite approach allows optimization of emission efficiency through the core structure while adjusting other properties through substituents, resolving the contradiction between efficiency and complexity

Inventive Principle:

Principle #40Composite materials

2Productivity

If materials with higher transition probability are used, then emission efficiency improves, but the molecular structure becomes more complex

Engineering Contradiction:

Improveemission efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent systematically changes molecular parameters by varying the substituent groups (L1, L2, R1-R4) attached to the condensed cyclic core. This allows optimization of transition probabilities and emission efficiency while controlling complexity through modular substitution rather than fundamentally complex core structures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the molecular structure into a core condensed cyclic portion (providing π-electron richness) and substituent portions (adjusting properties). This segmentation allows independent optimization of emission efficiency through the core while managing complexity through standardized substituent groups

Inventive Principle:

Principle #1Segmentation

3Duration of action of stationary object

If the OLED uses conventional materials, then the manufacturing process is simple, but the device lifetime is short

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmanufacturing complexity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent changes the chemical parameters of the organic materials by introducing the condensed cyclic compound with oxygen atoms in symmetrical positions. This parameter change improves device lifetime through enhanced material stability and performance, while the synthesis follows conventional organic chemistry methods, maintaining reasonable manufacturing ease

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 results in an OLED with low driving voltage, high luminance, and extended lifetime by increasing transition probability and emission efficiency.

Implementation Method 1

Carriers, such as the holes and electrons, may recombine in the emission layer to generate exitons. When the exitons drop from an excited state to a ground state, light is emitted.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence