Metal Complex Organic Composition for Low Voltage Electroluminescent Devices

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Solution Overview

Problem

Existing organic materials for electroluminescent devices do not achieve a sufficiently low driving voltage, limiting their efficiency and performance.

Innovation Solution

A composition comprising a metal complex with specific molecular energy levels and an organic compound, where the difference in their lowest unoccupied molecular orbital (LUMO) energy levels is less than 0.40 eV, is used to fabricate electroluminescent devices, optimizing the driving voltage and luminous efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If existing organic materials are used for electroluminescent devices, then the device can be fabricated, but the driving voltage is not sufficiently low

Engineering Contradiction:

Improvedriving voltageVSAvoidluminous efficiency

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by precisely controlling the LUMO energy level difference between the metal complex and organic compound to be less than 0.40 eV. This specific parameter optimization enables efficient electron injection from the organic compound to the metal complex, simultaneously achieving low driving voltage and high luminous efficiency in electroluminescent devices

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining a metal complex (containing transition metals like Ru, Rh, Pd, Os, Ir, or Pt with specific ligands) and an organic compound in a coordinated system. This composite structure leverages the complementary properties of both materials to achieve optimized electron injection and high-performance electroluminescence

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If the LUMO energy level difference between metal complex and organic compound is large, then electron injection is difficult, but if it is too small, energy loss increases

Engineering Contradiction:

Improveenergy loss during electron injectionVSAvoidelectron injection efficiency

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent optimizes the energy level parameter by establishing that the LUMO energy level difference between the metal complex and organic compound should be less than 0.40 eV. This precise parameter control balances electron injection efficiency with energy conservation, minimizing energy loss while ensuring effective electron transfer

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 solution results in electroluminescent devices with reduced driving voltage and enhanced luminous efficiency, making them suitable for high-performance light-emitting applications.

Implementation Method 1

a difference between an absolute value of a lowest unoccupied molecular orbital level (hereinafter referred to as an 'LUMO') energy level of the metal complex and an absolute value of an LUMO energy level of the organic compound as calculated by a computationalscientific approach is less than 0.40 eV

Methodology Applied

Scientific EffectElectron injection:

Data Source

PatentUS9048442B2Composition containing a metal complex and organic compound, and light-emitting element using said compound

Publication Date: 2015.06.02 SUMITOMO CHEM CO LTD

AI summary

Disclosed is a composition containing a metal complex and an organic compound, wherein the difference between the absolute value of the energy level of the lowest unoccupied molecular orbit of said metal complex and the absolute value of the lowest unoccupied molecular orbit of said organic compound, as calculated with a computational technique, is less than 0.40 eV.