OLED Emitting Compound for High PLQY and Blue Color Purity

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Solution Overview

Problem

Existing organic electroluminescence devices (OLEDs) face challenges in achieving high luminous efficiency, particularly in terms of photoluminescence quantum yield (PLQY) and blue color purity.

Innovation Solution

A compound represented by specific formulas (2) and (10) is introduced, featuring certain groups (R21-R28, R101-R110) that can form rings or be substituted, enhancing the PLQY and blue color purity, and is incorporated into the organic electroluminescence device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional compounds are used in organic EL devices, then the device can operate, but the photoluminescence quantum yield (PLQY) is insufficient and blue color purity is low

Engineering Contradiction:

Improveluminous efficiencyVSAvoidcompound structure complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical structure parameters of the compound by introducing specific substituents (formula 20) at defined positions (m and n values) in the core structure (formula 2). This structural parameter optimization achieves high PLQY and blue color purity without requiring overly complex multi-component systems

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure combining a core structure (formula 2) with specific functional groups (formula 20). This composite approach integrates electron-hole recombination functionality with high PLQY and blue emission characteristics in a single compound, improving luminous efficiency while maintaining manageable structural complexity

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If the compound structure is optimized for high PLQY and blue color purity, then luminous efficiency improves, but the molecular structure becomes more complex

Engineering Contradiction:

Improveblue color purityVSAvoidmolecular structure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing specific functional groups (formula 20) at particular positions (m and n) of the core structure (formula 2). This localized modification optimizes blue color purity and PLQY without requiring complex changes throughout the entire molecular structure, achieving high illumination quality with controlled complexity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the molecular structure into a core component (formula 2) and functional substituents (formula 20). This segmentation allows independent optimization of the core structure for stability and the substituents for optical properties, achieving high blue color purity while maintaining manageable overall molecular complexity

Inventive Principle:

Principle #1Segmentation

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 compound improves luminous efficiency and blue color purity, leading to enhanced performance in OLEDs.

Implementation Method 1

A compound having a high photoluminescence quantum yield (PLQY)

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS12448353B2Compound, material for organic electroluminescent element, organic electroluminescent element, and electronic device

Publication Date: 2025.10.21 IDEMITSU KOSAN CO LTD

AI summary

A compound is represented by a formula (2) below and has at least one group represented by a formula (20) below. In the formula (2): m is 0, 1, 2, or 3, n is 0, 1, 2 or 3, and m+n is an integer of 1 or more.