Quadridentate Platinum Complex for Blue OLED Efficiency and Durability

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Solution Overview

Problem

Current organic electroluminescent devices face challenges in achieving both high luminescent efficiency and durability, particularly with phosphorescent materials that can effectively emit light in the blue region while maintaining long-term performance.

Innovation Solution

A quadridentate platinum complex with a specific structure is incorporated into the organic electroluminescent device, specifically in the light-emitting layer, to enhance luminescent efficiency and durability, utilizing a compound represented by formulas (I) to (IV) that includes nitrogen-containing aromatic rings coordinating with platinum, and various substituents to optimize performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If phosphorescent materials are used to increase luminescence efficiency, then luminescence efficiency is improved, but durability deteriorates

Engineering Contradiction:

Improveluminescence efficiencyVSAvoiddurability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent modifies the chemical structure of phosphorescent materials by introducing specific ligand configurations and substituent groups to platinum complexes, changing the material parameters to achieve both high luminescence efficiency and improved durability simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite phosphorescent materials comprising platinum complexes with specifically designed ligands (combining cyclometalating ligands with pyridine or pyrazine ligands) to achieve synergistic effects that improve both luminescence efficiency and device durability

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If phosphorescent materials are used to enhance light emission, then luminescent efficiency is improved, but operational lifespan deteriorates

Engineering Contradiction:

Improveluminescent efficiencyVSAvoidoperational lifespan

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of moving object

Solution Approach 1:

The patent optimizes the molecular structure of phosphorescent emitters by adjusting ligand types and substituent positions, changing material parameters to extend operational lifespan while maintaining high luminescent efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention develops organic phosphorescent materials that can replace less stable inorganic materials, achieving both high efficiency and improved operational stability through carefully designed molecular structures

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of manufacture

If conventional light-emitting materials are used, then ease of manufacture is maintained, but luminescent efficiency and durability worsen

Engineering Contradiction:

Improveease of manufactureVSAvoidluminescent efficiency

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent modifies conventional phosphorescent material structures by introducing specific ligand configurations and substituent groups, achieving improved luminescent efficiency while maintaining compatibility with existing manufacturing processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention develops platinum complex structures with universal applicability that can be synthesized using standard organic synthesis methods while providing superior luminescent performance and device durability

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 organic electroluminescent device exhibits high external quantum efficiency and excellent durability, with improved light emission in the blue region and extended operational lifespan.

Implementation Method 1

luminescence efficiency of the device has been increased by using a phosphorescent material

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Implementation Method 2

Z1 and Z2 each independently represents a nitrogen-containing aromatic 6-membered ring coordinating to platinum atom at the nitrogen atom

Methodology Applied

Scientific EffectCoordination bonding: Chemical Bonding

Data Source

PatentUS8247091B2Platinum complex compound and organic electroluminescent device

Publication Date: 2012.08.21 UDC IRELAND

AI summary

An organic electroluminescent device is provided and has at least one organic layer between a pair of electrodes. The organic compound contains a compound represented by the following formula (I):Z1 and Z2 each represents a nitrogen-containing aromatic 6-membered ring coordinating to platinum atom at the nitrogen atom, Q represents a nitrogen-containing aromatic 5-membered ring having one or two nitrogen atoms, L1 and L2 each represents a single bond or a divalent group, and n represents 0 or 1.