Amine Compound Host for OLED Energy Transfer Efficiency

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Solution Overview

Problem

Current organic light-emitting devices face challenges in achieving high efficiency and long lifespan due to energy transfer inefficiencies and photo-orientation issues in their emission layers, particularly when using certain alkyl groups or electron-withdrawing cyano groups as substituents in amine compounds.

Innovation Solution

An amine compound represented by Formula 1, with specific structural features such as diamine groups and specific substituents like m-biphenyl and p-biphenyl, is used in the organic light-emitting device, which has suitable singlet and triplet energy levels and HOMO/LUMO energy levels for efficient energy transfer, acting as a host or dopant material in the emission layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional amine compounds with alkyl groups or cyano groups are used in the emission layer, then the device structure is simple, but energy transfer efficiency is low and device lifespan is short

Engineering Contradiction:

Improvedevice lifespanVSAvoidenergy transfer efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent changes the chemical structure parameters of the amine compound by introducing specific substituents (m-biphenyl, p-biphenyl, naphthyl, anthracenyl groups) and adjusting the diamine core structure. These structural parameter changes optimize the singlet and triplet energy levels as well as HOMO/LUMO levels, thereby improving energy transfer efficiency and device lifespan without compromising structural simplicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by combining diamine groups with specific aromatic hydrocarbon substituents (biphenyl, naphthyl, anthracenyl groups) to create a new class of amine compounds. This composite structure leverages the beneficial properties of each component: the diamine core provides appropriate energy levels while the aromatic substituents enhance stability and energy transfer characteristics

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional amine compounds are used in the emission layer, then the device complexity is low, but luminance efficiency and quantum luminescence efficiency are insufficient

Engineering Contradiction:

Improveluminance efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent optimizes molecular parameters including singlet energy level (S1), triplet energy level (T1), HOMO level, and LUMO level by selecting specific substituent positions and types on the diamine core. These parameter optimizations directly enhance luminance efficiency and quantum luminescence efficiency while maintaining reasonable molecular complexity through systematic structural design

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality enhancement by introducing specific functional groups (m-biphenyl, p-biphenyl, naphthyl, anthracenyl) at strategic positions on the diamine core structure. Each substituent is placed to optimize local electronic properties and energy distribution, thereby enhancing overall luminance efficiency without requiring complex global molecular architecture

Inventive Principle:

Principle #3Local quality

3Loss of energy

If conventional amine compounds are used, then the device structure is simple, but non-radiative transitions occur reducing overall efficiency

Engineering Contradiction:

Improvenon-radiative transition reductionVSAvoidmolecular structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent adjusts molecular energy level parameters by selecting specific diamine derivatives with appropriate substituent patterns. This optimization of energy level spacing and configuration reduces the probability of non-radiative transitions by creating more favorable radiative decay pathways, thereby improving overall device efficiency

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 amine compound enhances the efficiency and lifespan of organic light-emitting devices by improving energy transfer and reducing non-radiative transitions, resulting in high luminance and quantum luminescence efficiency with low driving voltage.

Implementation Method 1

suitable singlet and triplet energy levels and HOMO/LUMO energy levels for efficient energy transfer

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 2

reducing non-radiative transitions, resulting in high luminance and quantum luminescence efficiency

Methodology Applied

Scientific EffectRadiative transitions:

Implementation Method 3

The holes and the 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

PatentUS12178120B2Amine compound and organic light-emitting device including the same

Publication Date: 2024.12.24 SAMSUNG ELECTRONICS CO LTD

AI summary

Provided are an amine compound represented by Formula 1 and an organic light-emitting device including the same.The description of the substituents in Formula 1 is the same as provided in the detailed description.