Connected Host-Dopant Organic Metal Compounds for EL Solubility

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Solution Overview

Problem

Current organic electroluminescence (EL) materials face challenges in achieving high solubility and emission properties when using low molecular weight materials, which limits their application in wet process formation, and high molecular weight materials have shorter lifetimes and lower emission efficiency.

Innovation Solution

Development of organic metal compounds where host and dopant compounds are connected by a linker, allowing for energy transmission and increasing molecular weight, solubility, and emission efficiency, enabling the use of a wet process for device formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If low molecular weight organic EL materials are used, then emission properties are improved, but solubility is insufficient preventing wet process formation

Engineering Contradiction:

Improveemission propertiesVSAvoidsolubility

Core Design Contradiction:

Illumination intensityVSQuantity of substance

Solution Approach 1:

The molecule is divided into distinct functional segments: host compound units (providing emission properties) and dopant compound units (enhancing luminescence), connected by linker groups. This segmentation allows each component to contribute its specific function while maintaining overall molecular stability and solubility through the flexible linker structures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates composite molecular structures by combining host and dopant compounds within a single molecule. These composite organic metal compounds integrate the advantages of both host materials (emission properties) and dopant materials (luminescence efficiency) while achieving high solubility through the molecular-level integration and appropriate linker selection.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If high molecular weight organic EL materials are used, then solubility is improved enabling wet process formation, but emission properties and lifetime deteriorate

Engineering Contradiction:

ImprovesolubilityVSAvoidemission properties

Core Design Contradiction:

Quantity of substanceVSIllumination intensity

Solution Approach 1:

The invention optimizes molecular parameters by controlling the number and type of host and dopant units in the molecule, the length and structure of linker groups, and the overall molecular weight range. These parameter adjustments ensure high solubility for wet processing while maintaining short molecular dimensions that preserve efficient energy transmission and long device lifetime.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If host and dopant compounds are connected at molecular level, then energy transmission is improved, but molecular weight increases reducing solubility

Engineering Contradiction:

Improveenergy transmissionVSAvoidsolubility

Core Design Contradiction:

Use of energy by moving objectVSQuantity of substance

Solution Approach 1:

Linker groups serve as intermediaries connecting host and dopant compound units. These linkers facilitate efficient energy transmission from host to dopant while their molecular structure (length, flexibility, chemical composition) is optimized to maintain high solubility of the overall compound, thus mediating between the requirements for energy efficiency and solubility.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 organic metal compounds exhibit enhanced solubility and emission efficiency, leading to improved performance and longer lifetimes in organic electroluminescence devices, with the ability to form devices using a wet process like spin coating.

Implementation Method 1

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

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 EffectPhosphorescence: Phosphorescence

Data Source

PatentUS7575818B2Organic 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: 2009.08.18 SAMSUNG DISPLAY CO LTD

AI summary

Provided are 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. Also provided are organic metal compounds in which compounds for host and compounds for dopant where connected to make energy transmission between host and dopant possible at a molecular level, an organic electroluminescence display device using the same and a preparation method thereof.