Heterocyclic Compound Electron Transport Layer Driving Voltage

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Solution Overview

Problem

Current light-emitting devices face challenges in achieving high efficiency and long lifespan due to limitations in driving voltage and electron transfer capabilities, particularly in the electron transport region.

Innovation Solution

Incorporation of a heterocyclic compound represented by Formula 1 in the electron transport region, which enhances electron transfer ability and reduces driving voltage, improving the light-emitting device's efficiency and lifespan by combining strong electron acceptors like triazine and pyrimidine groups.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electron transport materials are used, then the device structure is simple, but the electron transfer ability is insufficient and driving voltage is high

Engineering Contradiction:

Improveelectron transfer abilityVSAvoiddriving voltage

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent employs composite electron transport materials comprising multiple heterocyclic compounds (triazine, pyrimidine, and their derivatives) to achieve synergistic effects. These composite materials provide superior electron transfer ability while reducing driving voltage compared to conventional single materials, directly resolving the contradiction between reliability and power consumption.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies molecular parameters of electron transport materials by introducing specific heterocyclic groups (triazine, pyrimidine) with varying electron affinity and HOMO/LUMO energy levels. This parameter optimization enables enhanced electron transfer capability at lower operating voltages, addressing the technical contradiction.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional electron transport materials are used, then the driving voltage can be maintained, but the device lifespan is limited

Engineering Contradiction:

Improvedevice lifespanVSAvoiddriving voltage

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent utilizes composite heterocyclic materials that provide both long-term operational stability and reduced driving voltage. The specific molecular structures (triazine, pyrimidine groups) offer enhanced chemical stability and electron transport efficiency, enabling extended device lifespan at lower voltage operation.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs small molecule heterocyclic compounds that can be efficiently deposited and replaced if needed, providing a cost-effective solution for achieving long device lifespan through optimized material composition rather than relying on expensive, complex structures.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If conventional electron transport materials are used, then the material structure is simple, but the current efficiency is insufficient

Engineering Contradiction:

Improvecurrent efficiencyVSAvoidmaterial structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements composite electron transport materials with complex heterocyclic structures (triazine, pyrimidine, and their derivatives) that achieve high current efficiency through optimized electron transport pathways. The composite nature provides synergistic effects that enhance productivity despite increased material structural complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces specific functional groups (triazine, pyrimidine) at strategic positions within the molecular structure to create localized regions of high electron affinity. This local optimization of material properties enhances current efficiency without requiring complete structural complexity throughout the entire material system.

Inventive Principle:

Principle #3Local quality

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 heterocyclic compound in the electron transport region results in improved current efficiency, reduced driving voltage, and extended device lifespan, making the light-emitting device more efficient and durable.

Implementation Method 1

Incorporation of a heterocyclic compound represented by Formula 1 in the electron transport region, which enhances electron transfer ability

Methodology Applied

Scientific EffectElectron transfer: Conduction (electrical)

Implementation Method 2

combining strong electron acceptors like triazine and pyrimidine groups

Methodology Applied

Scientific EffectElectron mobility enhancement: Conduction (electrical)

Data Source

PatentUS20240334820A1Light-emitting device including heterocyclic compound, electronic apparatus including the light-emitting device, and the heterocyclic compound

Publication Date: 2024.10.03 SAMSUNG DISPLAY CO LTD

AI summary

A light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, and a heterocyclic compound represented by Formula 1. In addition, an electronic apparatus including the light-emitting device and the heterocyclic compound represented by Formula 1 are also provided.