Aromatic Compound for OLED Emission Efficiency

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in reducing driving voltage, enhancing emission efficiency, and extending device life, particularly in achieving high external quantum efficiency and stable performance.

Innovation Solution

Incorporating an aromatic compound represented by Formula 1, which has a high lowest triplet excitation energy, into the emission layer or electron transport region of the organic electroluminescence device, thereby restricting the diffusion of triplet excitons and improving emission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic compounds are used in the emission layer, then the device can operate, but the emission efficiency and external quantum efficiency are low

Engineering Contradiction:

Improveemission efficiencyVSAvoidenergy loss due to triplet exciton diffusion

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent changes the molecular structure parameters of the organic compound by introducing specific substituents (R1-R6 groups including carbazole, triphenylamine, dibenzofuran, dibenzothiophene) and adjusting structural features (Formula 1 and Formula 2 configurations) to optimize the lowest triplet excitation energy (T1) value, thereby improving emission efficiency and reducing energy loss from triplet exciton diffusion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by combining different functional groups and molecular structures in the aromatic compound (Formula 1 and Formula 2) to create a material that simultaneously achieves high emission efficiency and controlled triplet exciton behavior, resolving the contradiction between productivity and energy loss

Inventive Principle:

Principle #40Composite materials

2Use of energy by stationary object

If the driving voltage is reduced, then energy consumption decreases, but maintaining high emission efficiency becomes more difficult

Engineering Contradiction:

Improvedriving voltageVSAvoidemission efficiency

Core Design Contradiction:

Use of energy by stationary objectVSProductivity

Solution Approach 1:

The patent optimizes the energy levels and electronic structure parameters of the organic compound through molecular design (Formula 1 and Formula 2) to achieve a balance where lower driving voltage can be maintained without sacrificing emission efficiency, as the modified molecular structure enables more effective charge transport and exciton utilization at reduced voltages

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If the device life is extended, then stability improves, but achieving high external quantum efficiency simultaneously becomes more challenging

Engineering Contradiction:

Improvedevice lifeVSAvoidexternal quantum efficiency

Core Design Contradiction:

Duration of action of stationary objectVSLoss of energy

Solution Approach 1:

The patent develops composite molecular structures (Formula 1 and Formula 2 with various R1-R6 substituents) that simultaneously provide long device lifetime through enhanced structural stability and maintain high external quantum efficiency by optimizing triplet exciton management, thus resolving the contradiction between duration of action and energy efficiency

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 aromatic compound enhances the emission efficiency and external quantum efficiency of the organic electroluminescence device, reducing driving voltage and extending device life while maintaining high blue emission efficiency.

Implementation Method 1

Methodology Applied

Scientific EffectTriplet exciton diffusion restriction:

Implementation Method 2

the organic electroluminescence display device is a so-called self-luminescent display device in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and a luminescent material including an organic compound in the emission layer emits light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

The holes and electrons injected to the emission layer recombine to generate excitons in the emission layer. The organic electroluminescence device emits light that is generated by the radiation deactivation of the excitons

Methodology Applied

Scientific EffectRadiation deactivation:

Data Source

PatentUS11787822B2Aromatic compound and organic electroluminescence device including the same

Publication Date: 2023.10.17 SAMSUNG DISPLAY CO LTD

AI summary

An aromatic compound which improves emission efficiency and an organic electroluminescence device including the same are provided. The organic electroluminescence device includes: a first electrode; a second electrode opposite to the first electrode; and a plurality of organic layers between the first electrode and the second electrode, where at least one organic layer among the plurality of organic layers includes the aromatic compound. The aromatic compound is represented by Formula 1 below.