Modified Pyrene Derivative for Organic EL Luminous Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescence (EL) devices have limitations in achieving high luminous efficiency, despite the use of pyrene derivatives as emitting materials.
Innovation Solution
A pyrene derivative with specific structural modifications, including the presence of substituted or unsubstituted aryl groups and a group represented by formula (2), is used in the emitting layer of the organic EL device to enhance luminous efficiency by controlling association and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional pyrene derivatives are used as emitting materials, then the device can be manufactured with existing materials, but the luminous efficiency remains insufficient
Solution Approach 1:
The patent modifies the chemical structure of pyrene derivatives by introducing specific substituent groups (formula 2) at defined positions (at least one of R1-R10) while maintaining at least two aryl groups. This structural parameter change optimizes the emitting material's properties to achieve higher luminous efficiency (external quantum yield of 5% or more) while remaining compatible with existing organic EL device manufacturing processes
Solution Approach 2:
The invention creates a composite emitting material by combining the modified pyrene derivative structure with specific substituent groups (formula 2: -X2-Y-Z where X, Y, Z are specific groups). This composite structural approach enhances the luminous efficiency by controlling molecular association and emission properties, while the material can still be integrated into conventional organic EL device architectures
2Loss of energy
If the pyrene derivative structure is modified to improve luminous efficiency, then external quantum yield increases, but the molecular structure becomes more complex
Solution Approach 1:
The patent applies local structural modification by introducing the specific substituent group (formula 2) at particular positions (at least one of R1-R10) on the pyrene core while maintaining the overall pyrene framework. This localized change optimizes emission properties and achieves high external quantum yield (≥5%) without requiring complete restructuring of the molecule, thus limiting the increase in complexity
Solution Approach 2:
The invention systematically varies specific structural parameters (the substituent groups X, Y, Z in formula 2 and their positions) to optimize luminous efficiency. By changing these specific parameters rather than the entire molecular structure, the patent achieves external quantum yield of 5% or more while controlling the complexity increase through targeted modifications
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 use of the modified pyrene derivative in the emitting layer of the organic EL device results in improved luminous efficiency, as demonstrated by increased external quantum yield and prolonged device lifetime.
Implementation Method 1
An organic electroluminescence (EL) device is a self-emitting device utilizing a principle that a fluorescence material emits light by energy of recombination of holes injected from an anode and electrons injected from a cathode when an electrical field is applied
Data Source
AI summary
A pyrene derivative represented by the following formula (1); wherein R1 to R10 are independently a hydrogen atom, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group or a group represented by the following formula (2), at least one of R1 to R10 is a group represented by the following formula (2) and at least two of R1 to R10 are substituted or unsubstituted aryl group. Provided that in the case where only one of R1 to R10 is a group represented by the following formula (2), at least one of the substituted or unsubstituted aryl groups is an aryl group having 10 to 50 carbon atoms. X, Y and Z are independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted alkoxy group;