Condensed Cyclic Compound for OLED Emission Layer
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Solution Overview
Problem
Current organic light-emitting devices face challenges in achieving high luminescence efficiency and color purity due to limitations in the materials used for emission layers, which affect their performance in terms of emission spectrum width and exciton energy levels.
Innovation Solution
The development of condensed cyclic compounds represented by Formula 1, which are incorporated into the emission layer of organic light-emitting devices, providing a rigid intramolecular structure that suppresses molecular structure changes and narrows the emission spectrum, and having specific energy levels to reduce the difference between singlet and triplet excitation energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic light-emitting materials are used, then the device can emit light, but the luminescence efficiency and color purity are limited due to broad emission spectrum and insufficient control over exciton energy levels
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of organic compounds to include rigid intramolecular structures (such as condensed cyclic groups). This structural parameter change suppresses molecular vibrations and rotations, thereby narrowing the emission spectrum width and improving color purity without sacrificing luminescence efficiency
Solution Approach 2:
The patent employs composite materials by designing organic compounds that combine multiple functional groups within a single molecule. These compounds integrate rigid intramolecular structures with appropriate substituents to simultaneously achieve narrow emission spectra, high color purity, and controlled exciton energy levels for efficient luminescence
2Use of energy by moving object
If conventional organic compounds are used in the emission layer, then the device operates, but the difference between singlet and triplet excitation energies is large, limiting luminescence efficiency
Solution Approach 1:
The patent utilizes parameter changes by carefully selecting and positioning substituents on the rigid intramolecular structure. These substitutions modify the HOMO-LUMO energy gap and the energy difference between singlet and triplet exciton states, enabling more efficient energy utilization and reducing energy loss while maintaining high luminescence efficiency
Solution Approach 2:
The patent employs copying by using deuterium substitution in some embodiments. Replacing hydrogen atoms with deuterium atoms creates an isotopic copy of the molecule that exhibits reduced vibrational energy loss, thereby narrowing the emission spectrum and improving both color purity and luminescence efficiency
3Ease of manufacture
If flexible organic molecules are used, then the material is easy to process, but the emission spectrum is broad and color purity is reduced
Solution Approach 1:
The patent applies parameter changes by introducing rigid intramolecular structures (such as fused ring systems and condensed cyclic groups) into the organic compound architecture. This fundamental structural parameter change restricts molecular flexibility, narrows the emission spectrum, and enhances color purity while the compounds remain processable through conventional organic semiconductor fabrication techniques
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 these compounds results in organic light-emitting devices with high color purity and excellent luminescence efficiency, characterized by a narrow full width at half maximum (FWHM) of the emission peak and improved external quantum efficiency.
Implementation Method 1
providing a rigid intramolecular structure that suppresses molecular structure changes and narrows the emission spectrum
Implementation Method 2
having specific energy levels to reduce the difference between singlet and triplet excitation energies
Implementation Method 3
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state, thereby generating light
Data Source
AI summary
Provided are a condensed cyclic compound represented by Formula 1, an organic light-emitting device including the condensed cyclic compound, and an electronic apparatus including the light-emitting device:wherein details of Formula 1 are the same as described in the present specification.