TADF Material Hexatomic Ring Connection for Luminous Efficiency

Solution Overview

Problem

Existing thermally activated delayed fluorescent materials have poor stability and excessively broad spectra due to single-bond connections between electron donors and acceptors, leading to inefficient luminous performance.

Innovation Solution

Connecting electron donors and acceptors with a rigid hexatomic ring to stabilize the molecular structure and control spectral width, thereby improving luminous efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electron donors and acceptors are connected by a single bond in TADF material, then the molecular structure has high flexibility, but the spectral width becomes excessively broad and luminous efficiency deteriorates

Engineering Contradiction:

Improvemolecular flexibilityVSAvoidluminous efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent changes the connection parameter from a single bond to a hexatomic ring structure, transforming the molecular geometry and restricting rotation. This parameter change narrows the spectral width while maintaining TADF properties, directly resolving the contradiction between flexibility and luminous efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure combining electron donor and acceptor units through a hexatomic ring bridge. This composite architecture integrates the benefits of both units while the rigid ring structure controls the spectral properties, improving luminous efficiency without sacrificing functional adaptability.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If electron donors and acceptors are connected by a single bond in TADF material, then the molecular structure has high flexibility, but the structural stability becomes poor

Engineering Contradiction:

Improvemolecular flexibilityVSAvoidstructural stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent changes the connection parameter from a single bond to a hexatomic ring structure, transforming the molecular geometry and restricting rotation. This parameter change narrows the spectral width while maintaining TADF properties, directly resolving the contradiction between flexibility and luminous efficiency.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If a hexatomic ring connection is used in TADF material, then the spectral width is narrowed and luminous efficiency is improved, but the molecular flexibility is reduced

Engineering Contradiction:

Improveluminous efficiencyVSAvoidmolecular flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent changes the connection parameter from a single bond to a hexatomic ring structure, transforming the molecular geometry and restricting rotation. This parameter change narrows the spectral width while maintaining TADF properties, directly resolving the contradiction between flexibility and luminous efficiency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11271176B2Thermally activated delayed fluorescent material, method of fabricating same, and electroluminescent device

Publication Date: 2022.03.08 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A thermally activated delayed fluorescent material, a method of fabricating the same, and an electroluminescent device are provided. An electron donor and an electron acceptor of the thermally activated delayed fluorescent material are connected with each other by a hexatomic ring. Thus, luminous efficiency of the thermally activated delayed fluorescent material can be improved.