Condensed Cyclic Compound for Light-Emitting Device Emission Layer
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Solution Overview
Problem
Current light-emitting devices face limitations in achieving high luminance, efficiency, and color purity due to challenges in the design of emission layers, particularly in the integration of compounds that can effectively facilitate delayed fluorescence and suppress Dexter energy transfer.
Innovation Solution
A condensed cyclic compound represented by Formula 1 is integrated into the emission layer, which includes a substituted or unsubstituted C2-C60 alkyl, alkenyl, or alkynyl group at an ortho position with respect to the core, linked to a nitrogen atom, enhancing structural stability and reducing Dexter energy transfer, thereby improving luminance and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional emission layer compounds are used, then device structure is simple, but luminance and color purity are insufficient
Solution Approach 1:
The patent modifies molecular parameters by introducing specific substituents (alkyl, alkenyl, or alkynyl groups) at the ortho position of the core structure, and by linking these groups to nitrogen atoms. This parameter change optimizes the balance between structural complexity and performance, achieving high luminance while maintaining reasonable molecular design
Solution Approach 2:
The patent employs composite molecular structures combining a core unit with multiple functional groups (alkyl, alkenyl, alkynyl) attached at specific positions. This composite approach allows the molecule to simultaneously achieve structural stability, suppressed Dexter energy transfer, and enhanced luminance output
2Productivity
If compounds facilitating delayed fluorescence are integrated, then efficiency improves, but Dexter energy transfer increases
Solution Approach 1:
The patent applies local quality modification by specifically placing alkyl, alkenyl, or alkynyl groups at the ortho position of the core structure and linking them to nitrogen atoms. This localized structural modification creates regions with different properties that suppress Dexter energy transfer while preserving delayed fluorescence efficiency
Solution Approach 2:
The patent converts the potentially harmful effect of Dexter energy transfer into a beneficial outcome by using the ortho-substituted nitrogen-linked groups to suppress this transfer mechanism. The structural design transforms what would be energy loss into improved efficiency by directing energy through desired pathways
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 condensed cyclic compound in the light-emitting device results in low driving voltage, high luminance, high efficiency, and long lifespan, with improved color purity and suppressed Dexter energy transfer.
Implementation Method 1
design of emission layers, particularly in the integration of compounds that can effectively facilitate delayed fluorescence
Implementation Method 2
suppress Dexter energy transfer
Implementation Method 3
Carriers, such as holes and electrons, may recombine in such an emission layer region to produce excitons. These excitons transition from an excited state to a ground state to generate light
Data Source
AI summary
Embodiments provide a condensed cyclic compound, a light-emitting device including the condensed cyclic compound, an electronic apparatus including the light-emitting device, and an electronic device including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electron, and an interlayer between the first electrode and the second electrode and including an emission layer. The condensed cyclic compound is represented by Formula 1, which is explained in the specification: