TADF Organic Compound Structure for Lower-Cost OLED Emission
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Solution Overview
Problem
There is a need for new types of thermally activated delayed fluorescence (TADF) materials that can be used in OLED devices, as currently available TADF materials are limited and require rare metal elements, which are costly and chemically unmodified.
Innovation Solution
Development of an organic compound with a structure represented by formula (I), featuring substituted carbon, divalent heteroatoms, and aromatic rings, which can be used as a TADF material in OLED devices, improving luminous efficiency and solubility, and allowing for mass production with lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent materials or TADF materials requiring rare metal elements are used, then luminous efficiency can be improved, but production cost increases and chemical modifiability decreases
Solution Approach 1:
The patent replaces expensive rare metal elements (iridium, platinum) with common organic compounds containing C, H, N, O, F, and Cl elements. The organic compound structure uses readily available elements that are inexpensive and abundant, eliminating the need for costly rare metals while maintaining TADF functionality.
Solution Approach 2:
The patent modifies molecular parameters by changing the core structure from traditional designs to a specific heterocyclic framework with formula (I), adjusting substituent groups (A, R, X, Y) to optimize the energy gap between S1 and T1 states. This enables efficient reverse intersystem crossing without requiring rare metals, achieving both low cost and high luminous efficiency.
2Use of energy by moving object
If phosphorescent materials or conventional TADF materials are used, then luminous efficiency can be improved, but adaptability and chemical modifiability decrease
Solution Approach 1:
The patent divides the organic compound into distinct functional segments: a heterocyclic core structure (formula I) with variable substituent groups (A, R, X, Y). This modular design allows independent optimization of different parts - the core provides the TADF mechanism while substituents can be modified to adjust properties like solubility, stability, and emission wavelength, enhancing chemical adaptability.
Solution Approach 2:
The patent creates a universal heterocyclic core structure that can serve multiple functions: it provides the TADF mechanism through appropriate energy level design, allows for chemical modification through various substituent positions, and enables tuning of photophysical properties. The structure can be adapted for different applications by changing substituents while maintaining the core functionality.
3Adaptability or versatility
If more TADF material types are developed, then material selection for OLED devices improves, but research and development time increases
Solution Approach 1:
The patent establishes a systematic approach to developing TADF materials by defining a general formula (I) with specific variable parameters (A, R, X, Y). Instead of developing each material from scratch, researchers can systematically vary these parameters to create new compounds with desired properties, significantly reducing development time while expanding material selection.
Solution Approach 2:
The patent combines a heterocyclic core structure with various substituent groups to create a family of related compounds. This composite approach allows researchers to build upon a proven core structure and make incremental modifications, reducing the need for extensive de novo development while still enabling diverse material selection for different OLED applications.
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 compound enhances luminous efficiency and environmental friendliness of OLED devices, offering improved performance and suitability for mass production through a branched structure and heterocyclic ring skeleton.
Implementation Method 1
when the energy gap between the S1 state and the T1 state is small and T1 state excitons have a relatively long lifetime, under a certain temperature condition, the T1 state excitons may use reverse intersystem crossing (RISC) to achieve the T1→S1 process
Implementation Method 2
the T1 state excitons are converted to the S1 state by absorbing environmental heat
Implementation Method 3
Fluorescence is the radiation decay transition of singlet excitons
Implementation Method 4
OLED devices, as a new generation display technology, have been widely used
Data Source
AI summary
An organic compound, having a structure shown in formula (I), is provided. The organic compound includes:where X and Y are each independently selected from substituted carbon, divalent heteroatom or substituted heteroatom with a valence greater than 2; A and R are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C6-C30 aryl, or substituted or unsubstituted C2-C30 heterocyclic; and when one of A and R is hydrogen or deuterium, another of A and R is not hydrogen or deuterium; and substituents of the substituted carbon, the substituted heteroatom with the valence greater than 2, the substituted C1-C10 alkyl, the substituted C6-C30 aryl and the substituted C2-C30 heterocyclic are each independently selected from one or a combination of deuterium, nitro, cyano, substituted or unsubstituted C1˜C10 alkyl, substituted or unsubstituted C6˜C30 aryl, or substituted and unsubstituted C2˜C30 heterocyclic.