Macrocyclic Host Materials for OLED Quantum Efficiency

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Solution Overview

Problem

There is a need for novel macrocycles that provide high device quantum efficiency in organic light-emitting diodes (OLEDs).

Innovation Solution

Compounds with specific structures, such as Formula I and Formula II, are used in the organic layer of OLEDs, which include unsubstituted or substituted 5- or 6-membered monocyclic or polycyclic aromatic rings, acting as hosts or emitters to enhance the efficiency of the devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional organic materials are used in OLEDs, then device fabrication is simplified, but device quantum efficiency is insufficient

Engineering Contradiction:

Improvedevice fabricationVSAvoidquantum efficiency

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent modifies the molecular structure of organic compounds by introducing specific macrocyclic frameworks with varying substituents (R1-R6 groups) to optimize the HOMO-LUMO energy gap and improve quantum efficiency while maintaining solution processability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite molecular designs combining macrocyclic cores with various aromatic substituents (pyridine, pyrimidine, triazine rings) to create materials that exhibit both high quantum efficiency and ease of fabrication through solution processing

Inventive Principle:

Principle #40Composite materials

2Measurement precision

If saturated colors are achieved through absorption filters, then color purity is improved, but device complexity and light loss increase

Engineering Contradiction:

Improvecolor saturationVSAvoiddevice structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the color filtering function from separate absorption filter layers and integrates it directly into the emissive layer through molecular design, eliminating the need for additional filter components and reducing device complexity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The organic compounds serve multiple functions simultaneously: they act as hosts, emitters, and color definers within the emissive layer, replacing the need for separate components and simplifying the overall device structure

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

These compounds improve the quantum efficiency of OLEDs, enabling the development of high-performance organic light-emitting devices suitable for various applications, including consumer products and lighting panels.

Implementation Method 1

OLEDs make use of thin organic films that emit light when voltage is applied across the device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10236458B2Organic electroluminescent materials and devices

Publication Date: 2019.03.19 UNIVERSAL DISPLAY CORP

AI summary

The present invention includes high triplet hosts with a macrocyclic structure that may provide high device quantum efficiency in OLEDs.