Pyrene Derivative for OLED Luminous Efficiency

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing organic electroluminescence elements suffer from low luminous efficiency and chromaticity changes due to strong inter-molecular interactions, aggregation, and poor orientation during vapor deposition, leading to drive deterioration and aggregate emission.

Innovation Solution

A pyrene derivative with a specific structure is used, characterized by General Formula 1, which reduces inter-molecular interaction, enhances orientation, and prevents aggregation, thereby maintaining high luminous efficiency and color purity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional pyrene-based compounds are used, then blue emission is realized at good luminous efficiency, but strong inter-molecular interaction causes poor orientation in vapor deposition and aggregation

Engineering Contradiction:

Improveluminous efficiencyVSAvoidorientation in vapor deposition

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent modifies the molecular structure parameters of pyrene-based compounds by introducing specific substituents (General Formula 1) to change inter-molecular interaction strength, thereby improving vapor deposition orientation while maintaining luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure combining pyrene core with specific substituent groups (Formula 1) to achieve both strong emission and controlled inter-molecular interactions for better deposition orientation

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If conventional pyrene-based compounds are used, then blue emission is realized, but aggregation occurs leading to excimer emission and chromaticity changes

Engineering Contradiction:

Improveemission intensityVSAvoidchromaticity stability

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The patent changes molecular parameters by introducing specific substituents in General Formula 1 to reduce inter-molecular interaction strength, preventing aggregation and excimer formation while maintaining blue emission intensity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful strong inter-molecular interaction that causes aggregation into a beneficial controlled interaction through molecular design, preventing excimer emission while maintaining good luminous efficiency

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Illumination intensity

If conventional pyrene-based compounds are used, then emission is achieved, but drive deterioration occurs with emission intensity decrease and chromaticity change over time

Engineering Contradiction:

Improveemission intensityVSAvoiddrive durability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent modifies molecular parameters through specific substituent design in General Formula 1 to reduce inter-molecular interactions, preventing aggregation and structural changes during operation, thereby improving drive durability and stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent incorporates stabilizing substituent groups in the molecular structure beforehand to prevent drive deterioration, aggregation, and chromaticity changes before they occur during extended operation

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 electroluminescence element exhibits improved luminous efficiency, resistance to chromaticity changes, and efficient vapor deposition, resulting in a stable and high-performance light-emitting device with low power consumption.

Implementation Method 1

Organic electroluminescence elements (hereinafter also referred to as 'elements' or 'organic EL elements') emit light at high brightness and at a low drive voltage

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

some conventional pyrene-based compounds have such a strong inter-molecular interaction that they are not suited to vapor deposition, and the degree of orientation in vapor deposition is not high, either

Methodology Applied

Scientific EffectVapor deposition: Physical Vapour Deposition

Data Source

PatentUS9608207B2Organic electroluminescence element

Publication Date: 2017.03.28 UDC IRELAND

AI summary

An organic electroluminescence element that uses a compound expressed by the following general formula has low inter-molecular interaction and high orientation during vapor deposition, and by using compounds that are resistant to aggregation, luminous efficiency is high, and there is little change in chromaticity accompanying drive deterioration (either V1 or W1 and either V2 or W2 form rings, the rings formed by V1 and V2 are six-membered rings, and the rings formed by W1 and W2 are five-membered rings; A2 to A4 and A6 to A8 represent CRZ or N, and RZ represents a hydrogen atom or a substituent; and R2, R3, R7, and R8 represent a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a hydrogen atom [sic], or a deuterium atom.).