Delayed Fluorescent OLED Compound for Efficiency and Lifetime
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Solution Overview
Problem
Existing delayed fluorescent materials for organic electroluminescent devices do not offer sufficient improvements in device lifetime and light emission efficiency, and their chemical structures are not well generalized.
Innovation Solution
A compound represented by a specific general formula with varying substituents and donor groups, such as carbazol-9-yl, is developed to enhance light emission characteristics and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a delayed fluorescent material is used to improve light emission efficiency, then the light emission efficiency is improved, but the device lifetime improvement is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the delayed fluorescent material by introducing specific substituents (cyano group, donor groups) and heteroaryl groups bonded via nitrogen atoms, which simultaneously improves light emission efficiency and device lifetime by optimizing the molecular properties for both performance and stability
Solution Approach 2:
The patent creates a composite molecular structure combining electron-accepting groups (cyano, triazinyl) with electron-donating groups (carbazol-9-yl) in a specific arrangement, forming a composite material that achieves synergistic effects for both high light emission efficiency and extended device lifetime
2Use of energy by moving object
If various delayed fluorescent materials are developed through trial and error, then some light emission improvement is achieved, but it is not easy to generalize the chemical structure
Solution Approach 1:
The patent establishes a universal chemical structure formula (Formula 1) that can accommodate various substituents and groups while maintaining the core delayed fluorescent properties, making it easy to generalize and apply to different specific compounds with improved light emission efficiency
Solution Approach 2:
The patent defines specific parameter ranges and structural requirements (R1-R5 substituents, X1-X3 heteroatoms, Ar1-Ar2 heteroaryl groups) that create a generalizable framework for designing delayed fluorescent materials, transforming trial-and-error development into a systematic approach
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 exhibits excellent light emission characteristics and efficiency, making it suitable for organic light emitting devices, particularly in enhancing device performance.
Implementation Method 1
in an excited state, after having undergone reverse intersystem crossing from an excited triplet state to an excited singlet state, emits fluorescence when returning back from the excited singlet state to a ground state
Implementation Method 2
emits fluorescence when returning back from the excited singlet state to a ground state
Implementation Method 3
in the case where a light emitting compound is excited through carrier injection thereinto
Data Source
AI summary
An organic light emitting device using a compound of the following general formula has excellent characteristics. R1 to R5 each are H, D, a cyano group, an alkyl group, an aryl group or a donor group, one or more are cyano groups, one or more are donor groups; X1 to X3 each are N or C(R); R is H, D or a substituent; one or more of Ar1 and Ar2 each are a heteroaryl group bonding via N; L1 is a single bond or a linked group.