Connected Host-Dopant Organic Metal Compounds for EL Devices

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Solution Overview

Problem

Current organic electroluminescence (EL) materials have low solubility, limiting their formation via wet processes and resulting in shorter lifetimes and lower emission properties compared to low molecular weight materials, which are typically formed using dry processes.

Innovation Solution

Development of organic metal compounds where host and dopant compounds are connected, enhancing solubility and emission efficiency by increasing molecular weight, allowing for the use of wet processes like spin coating while maintaining high emission properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If high molecular weight EL material is used to increase solubility for wet process formation, then ease of manufacture is improved, but emission property and lifetime deteriorate

Engineering Contradiction:

Improveease of manufactureVSAvoidemission property

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent creates a composite material system by connecting host compound and dopant compound through a linker group to form a single integrated EL material molecule. This composite structure combines the solubility advantages of high molecular weight materials with the emission properties of optimized low molecular weight materials, resolving the contradiction between ease of manufacture and emission property.

Inventive Principle:

Principle #40Composite materials

2Reliability

If low molecular weight EL material is used to achieve high emission property, then emission property is improved, but solubility deteriorates limiting wet process formation

Engineering Contradiction:

Improveemission propertyVSAvoidsolubility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent designs a composite EL material where host and dopant compounds are covalently connected via a linker. This molecular-level composite structure provides sufficient solubility for wet process formation while maintaining the high emission properties characteristic of optimized low molecular weight materials.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by introducing a specific linker group with particular chemical properties between the host and dopant compounds. This linker is designed with specific solubility characteristics that enhance overall material solubility without compromising the emission properties of the core host and dopant structures.

Inventive Principle:

Principle #3Local quality

3Productivity

If high molecular weight EL material is used to improve solubility, then productivity is improved through wet process, but lifetime deteriorates

Engineering Contradiction:

ImproveproductivityVSAvoidlifetime

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent creates a composite EL material structure that enables wet process formation (improving productivity) while the optimized molecular architecture of the connected host-dopant system maintains the stability and lifetime characteristics of low molecular weight materials.

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 connected host-dopant compounds enable the formation of organic EL devices with improved solubility and emission efficiency, offering a more economical and efficient process for device preparation with enhanced performance.

Implementation Method 1

organic metal compounds in which compounds for host and compounds for dopant are connected to make energy transmission between host and dopant possible on a molecular level

Methodology Applied

Scientific EffectEnergy transmission:

Implementation Method 2

organic electroluminescence display devices using the compounds

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

Phosphorescent substances have an organomineral compound structure containing generally heavy atoms, by which an exiton can be transformed from the state of triplet, a forbidden transition, through allowed transition

Methodology Applied

Scientific EffectHeavy atom effect:

Implementation Method 4

Phosphorescent substances have much higher emitting efficiency by using triplet exiton

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS7541100B2Organic metal compounds in which compounds for host and compounds for dopant are connected, organic electroluminesence display devices using the compounds and method for preparation of the devices

Publication Date: 2009.06.02 SAMSUNG DISPLAY CO LTD

AI summary

Organic metal compounds in which compounds for host and compounds for dopant are connected, organic electroluminescence display devices using the compounds and a method for preparation of the devices are disclosed. Also disclosed are organic metal compounds in which the compounds for host and the compounds for dopant are connected to make energy transmission between host and dopant possible in a molecular level, organic electroluminescence display devices using the same and a preparation method thereof.