Organic Compound Deep Red Emission BT.2020
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Solution Overview
Problem
Existing organic light-emitting elements struggle to reproduce the chromaticity coordinates (0.71, 0.29) for red color in the BT-2020 color reproduction range, necessitating a compound that emits red light at a longer wavelength with improved light emission efficiency and durability.
Innovation Solution
An organic compound with a specific molecular structure, represented by formula [1], is synthesized, featuring a deep red emission wavelength, low oxidation potential for chemical stability, and a basic skeleton with extended conjugation and steric distortion to suppress crystallinity and enhance sublimation stability, allowing for high light emission efficiency and durability in organic light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a compound structure is designed to emit red light at longer wavelength, then color reproduction range is improved, but light emission efficiency deteriorates
Solution Approach 1:
The patent modifies molecular parameters by extending the conjugation length of the basic skeleton and introducing specific substituents (R1-R24) to adjust the emission wavelength to the deep red region (600-680 nm) while optimizing light emission efficiency through controlled HOMO/LUMO energy levels
Solution Approach 2:
The patent creates a composite molecular structure combining a specific basic skeleton (formula [1]) with various substituent groups, forming a compound that integrates both long-wavelength emission capability and high light emission efficiency, achieving chromaticity coordinates within BT.2020 red region
2Measurement precision
If molecular structure is extended to achieve longer emission wavelength, then color purity is improved, but chemical stability deteriorates
Solution Approach 1:
The patent optimizes the balance between conjugation length (for color purity) and molecular stability by controlling the extent of skeleton extension and selecting appropriate substituent groups that maintain chemical stability while achieving deep red emission with high color purity
Solution Approach 2:
The patent introduces specific substituent groups at particular positions on the basic skeleton to locally enhance stability without compromising the overall conjugation system, thereby maintaining both color purity and chemical stability
3Adaptability or versatility
If conjugation is extended to increase emission wavelength, then color reproduction is improved, but crystallinity increases which reduces sublimation stability
Solution Approach 1:
The patent introduces steric distortion through asymmetric substituent arrangements and bulky groups that prevent efficient molecular packing, thereby suppressing crystallinity and enhancing sublimation stability while maintaining the extended conjugation system for deep red emission
Solution Approach 2:
The patent adjusts molecular parameters by introducing specific steric hindrance elements that modify the packing behavior and crystallization tendency, achieving a balance between extended conjugation (for color reproduction) and suppressed crystallinity (for sublimation stability)
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 achieves high color purity red light emission, extending the color reproduction range to BT-2020 standards, providing an organic light-emitting element with enhanced light emission efficiency and driving durability.
Implementation Method 1
Electrons and holes are injected from the pair of electrodes to thereby generate excitons of a light-emitting organic compound in the organic compound layer. The organic light-emitting element emits light when the excitons return to their ground state.
Data Source
AI summary
An organic compound that emits red light having a long wavelength and that is represented by formula [1] below. In the formula [1], R1 to R24 are each independently selected from a hydrogen atom or a substituent.