Condensed Ring Host Compound for OLED Thermal Stability

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Solution Overview

Problem

Existing organic light-emitting devices face challenges in achieving high thermal resistance and durability due to limitations in materials used for the organic layers, which affect their electroluminescence performance and lifespan.

Innovation Solution

A compound represented by Formula 1, which includes a condensed ring structure, is used as a host in the emission layer of an organic light-emitting device, enhancing its thermal resistance and durability by increasing the glass transition temperature and incorporating heteroatom substituents, thereby improving electroluminescence characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic materials are used in the emission layer, then the device structure is simple and manufacturing is easier, but the thermal resistance and durability are insufficient

Engineering Contradiction:

ImprovedurabilityVSAvoidcompound structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the chemical parameters of the organic compound by introducing a condensed ring structure (such as dibenzofuran, dibenzothiophene, carbazole) into the host molecule. This structural modification increases the glass transition temperature (Tg) and thermal stability of the material, thereby improving the device's durability and thermal resistance without fundamentally changing the device architecture

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite organic compounds that combine multiple functional moieties within a single molecule. The host compound integrates electron-transporting groups, hole-transporting groups, and condensed ring structures to create a multifunctional material that simultaneously provides thermal stability, charge transport, and exciton management capabilities

Inventive Principle:

Principle #40Composite materials

2Temperature

If conventional organic materials are used in the emission layer, then the manufacturing process is simpler, but the thermal resistance is insufficient

Engineering Contradiction:

Improvethermal resistanceVSAvoidmanufacturing complexity

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent modifies the thermal parameters of the organic material by incorporating rigid condensed ring structures that increase the glass transition temperature (Tg). This parameter change enhances the material's thermal resistance, allowing the device to maintain performance at higher operating temperatures

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If conventional organic materials are used in the emission layer, then the device has simpler material composition, but the lifespan is limited

Engineering Contradiction:

ImprovelifespanVSAvoidcompound structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent changes the molecular parameters by introducing condensed ring structures that increase the glass transition temperature and thermal stability of the host material. These parameter changes directly improve the device lifespan by preventing material degradation at operating temperatures, extending the operational lifetime of the organic light-emitting device

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent incorporates thermally stable condensed ring structures into the host compound design before device operation. This preemptive structural reinforcement acts as a cushion against thermal degradation and material breakdown during device operation, thereby extending lifespan before failure can occur

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Use of energy by moving object

If conventional organic materials are used in the emission layer, then the electroluminescence performance is adequate, but the efficiency is limited

Engineering Contradiction:

Improveelectroluminescence efficiencyVSAvoidcompound structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent modifies the electronic parameters of the host compound by incorporating condensed ring structures with appropriate HOMO-LUMO energy levels. This changes the energy transfer efficiency and charge carrier mobility, thereby improving electroluminescence efficiency while maintaining device functionality

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 compound in the organic light-emitting device results in improved thermal resistance, high-temperature environment resistance, and extended lifespan, along with enhanced electroluminescence performance and efficiency.

Implementation Method 1

enhancing its thermal resistance and durability by increasing the glass transition temperature

Methodology Applied

Scientific EffectGlass transition:

Implementation Method 2

Carriers, such as holes and electrons, may be recombined in the emission layer to produce excitons. Then, the excitons may be transitioned from an excited stated to a ground state, thereby generating light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS9553271B2Compound and organic light-emitting device including the same

Publication Date: 2017.01.24 SAMSUNG DISPLAY CO LTD

AI summary

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