Condensed Cyclic Compound for OLED Light Extraction
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving high efficiency and long lifespan due to limitations in the materials used for the emission layer, which affect the light extraction efficiency and chemical stability.
Innovation Solution
A condensed cyclic compound represented by Formula 1 is introduced, which features a plate-like structure with a boron atom and an amine substituted with an alkyl group or a carbocyclic group. This compound enhances electron donating ability, increases the f-value for high-efficiency delayed fluorescence, and improves light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED materials are used in the emission layer, then the device structure is simpler, but the light extraction efficiency and chemical stability deteriorate
Solution Approach 1:
The patent changes the molecular structure parameters of the emission layer materials by using condensed cyclic compounds with specific ring structures (Formula 1). This structural parameter change improves both chemical stability and light extraction efficiency simultaneously, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The patent employs composite material design by combining the condensed cyclic compound (Formula 1) with dopant materials in the emission layer. This composite approach enhances chemical stability and light extraction efficiency while maintaining a manageable device structure.
2Productivity
If conventional emission layer materials are used, then the manufacturing process is simpler, but the maximum quantum efficiency and lifespan deteriorate
Solution Approach 1:
The patent modifies the structural parameters of the emission layer compounds by introducing condensed cyclic structures with specific ring systems (Formula 1). This parameter change increases the f-value for delayed fluorescence, thereby improving maximum quantum efficiency while the modular structure keeps manufacturing feasible.
Solution Approach 2:
The patent applies local quality enhancement by designing specific regions of the molecule (the condensed cyclic core structure in Formula 1) to have enhanced electron donating ability and light emission properties. This localized optimization improves quantum efficiency without requiring complete redesign of the entire device.
3Use of energy by moving object
If existing OLED materials are used, then the device operation is simpler, but the light extraction efficiency and driving voltage performance deteriorate
Solution Approach 1:
The patent changes the electronic parameters of the emission layer materials by using condensed cyclic compounds (Formula 1) with optimized HOMO-LUMO energy levels. This parameter optimization reduces the driving voltage required for device operation while the well-defined structure simplifies material selection and device operation.
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 OLEDs results in a low driving voltage, high maximum quantum efficiency, high efficiency, and a long lifespan, addressing the limitations of existing OLED materials.
Implementation Method 1
increases the f-value for high-efficiency delayed fluorescence
Implementation Method 2
improves light extraction efficiency
Data Source
AI summary
Provided is a condensed cyclic compound represented by Formula 1 and a light-emitting device including the same wherein Formula 1 is as described in the detailed description of the present specification. The light-emitting device includes: a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, and a second capping layer located outside the second electrode and having a refractive index of 1.6 or more, wherein the emission layer includes at least one of the condensed cyclic compound represented by Formula 1.