Light-Emitting Device Emission Layers with Condensed Cyclic Compounds
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in enhancing their performance in terms of luminance, driving voltage, and response speed, particularly in the design of the emission layer and hole transport region.
Innovation Solution
Incorporating a condensed cyclic compound represented by Formula 1 in the emission layer and a compound represented by Formula 201 or a combination thereof in the hole transport region, along with a capping layer with a refractive index of 1.6 or more, to improve the efficiency and performance of the light-emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional emission layer materials are used, then device structure is simple, but luminance is insufficient and driving voltage is high
Solution Approach 1:
The patent changes the molecular structure parameters of emission layer materials by introducing condensed cyclic compounds with specific formula structures (Formula 1) containing fused aromatic rings and heterocyclic groups. This structural parameter change enables improved luminance and reduced driving voltage through enhanced charge transport and exciton utilization properties.
Solution Approach 2:
The patent employs composite material design by combining condensed cyclic compounds (Formula 1) with hole transport compounds (Formula 201 or 202) in the emission layer. This composite approach creates synergistic effects where the condensed cyclic compound provides high luminance and the hole transport compound optimizes charge transport, collectively reducing driving voltage.
2Speed
If conventional hole transport region materials are used, then device structure is simple, but response speed is slow
Solution Approach 1:
The patent changes the molecular parameters of hole transport materials by using compounds with specific formula structures (Formula 201 and 202) containing carbazole groups and triphenylamine moieties. These parameter changes enable faster hole transport and improved response speed while maintaining reasonable device structure complexity.
3Illumination intensity
If emission layer efficiency is improved, then luminance increases, but driving voltage increases
Solution Approach 1:
The patent uses composite material design in the emission layer by combining condensed cyclic compounds (Formula 1) with hole transport compounds (Formula 201 or 202). This composite structure enables efficient charge transport and exciton utilization that simultaneously improves luminance and maintains low driving voltage, resolving the trade-off between emission efficiency and voltage requirement.
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 proposed solution enhances the luminance and reduces the driving voltage, thereby improving the overall performance and efficiency of the light-emitting device.
Implementation Method 1
Carriers, such as the holes and the electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light.
Data Source
AI summary
A light-emitting device including a condensed cyclic compound represented by Formula 1, wherein the condensed cyclic compound of Formula 1 may be used in the emission layer of the light-emitting device:where the detailed description of Formula 1 is the same as described in the present specification.