Fused Polycyclic Compound for Blue OLED Light Emission Efficiency
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Solution Overview
Problem
Current organic light emitting elements face challenges in achieving high light emission efficiency and durability, particularly for blue light emission, due to limitations in oscillator strength and susceptibility to degradation.
Innovation Solution
A fused polycyclic compound with specific structural features, such as naphtho[2,3-e:6,7-e′]diacephenanthrylene and naphtho[2,3-e:7,6-e′]diacephenanthrylene, is developed, which enhances oscillator strength and stability by expanding conjugation sequences and minimizing rotational oscillations, while maintaining blue light emission within the 430-480 nm range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional blue light emitting compounds are used, then blue light emission is achieved, but the oscillator strength is insufficient resulting in low light emission efficiency
Solution Approach 1:
The patent changes the molecular structure parameters by introducing fused polycyclic frameworks (naphtho[2,3-e:6,7-e′]diacephenanthrylene and naphtho[2,3-e:7,6-e′]diacephenanthrylene) to increase oscillator strength. This structural modification directly addresses the insufficient oscillator strength of conventional blue light emitting compounds, thereby improving light emission efficiency without sacrificing emission color.
2Reliability
If blue light emitting materials are used, then blue light emission is achieved, but durability is poor due to susceptibility to degradation
Solution Approach 1:
The patent employs composite fused polycyclic structures combining naphtho[2,3-e:6,7-e′]diacephenanthrylene and naphtho[2,3-e:7,6-e′]diacephenanthrylene frameworks with various substituent groups. This composite structural approach enhances molecular stability and resistance to degradation, thereby improving durability while maintaining blue light emission performance over extended periods.
3Ease of manufacture
If simple molecular structures are used, then ease of manufacture is improved, but color purity is insufficient
Solution Approach 1:
The patent segments the molecular structure into distinct functional components: a core fused polycyclic framework (naphtho[2,3-e:6,7-e′]diacephenanthrylene or naphtho[2,3-e:7,6-e′]diacephenanthrylene) and variable substituent groups (R1-R20). This segmentation allows systematic optimization of color purity through substituent selection while maintaining a standardized core structure that facilitates manufacturing.
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 achieves high light emission efficiency and durability by increasing oscillator strength and reducing degradation, resulting in an organic light emitting element with superior color purity and prolonged luminance.
Implementation Method 1
An organic light emitting element is an element which includes a thin film containing a fluorescent or a phosphorescent organic compound between a pair of electrodes, which generates excitons of the fluorescent or the phosphorescent organic compound by injecting electrons and holes (positive holes) from the respective electrodes, and which uses light emitted when the excitons are returned to the ground state.
Data Source
AI summary
The present invention provides a novel fused polycyclic compound suitably used for a blue light emitting element and an organic light emitting element including the fused polycyclic compound.A fused polycyclic compound is represented by at least one of the general formulas [1] and [2] according to claim 1. In the general formulas [1] and [2], R1 to R20 each represent a hydrogen atom or a substituent.