Condensed-Cyclic Compound for OLED Host Material
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving excellent electric characteristics and thermal stability, particularly in maintaining efficiency and longevity due to limitations in the organic layer's material properties.
Innovation Solution
A novel condensed-cyclic compound represented by Formula 1 is introduced, which can be used as a host in the emission layer of an organic light-emitting device, allowing for control of HOMO and LUMO levels and T1 energy levels, thereby enhancing efficiency, reducing driving voltage, and improving device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic layer materials are used, then device structure is simple, but electric characteristics and thermal stability are insufficient
Solution Approach 1:
The patent employs composite organic layer materials comprising multiple functional components with complementary properties. The organic layer integrates materials with different characteristics to achieve both excellent electric performance and thermal stability, resolving the contradiction between reliability improvement and material complexity increase.
Solution Approach 2:
The patent optimizes key parameters of the organic layer materials, including HOMO/LUMO energy levels, charge mobility, and thermal decomposition temperature. By carefully selecting and adjusting these parameters within specific ranges, the invention achieves superior electric characteristics and thermal stability while managing material complexity.
2Productivity
If organic layer materials with optimized energy levels are used, then efficiency and lifespan are improved, but driving voltage increases
Solution Approach 1:
The patent applies local quality optimization by creating distinct regions within the organic layer with different material compositions and energy level characteristics. The hole transport region and electron transport region are locally optimized with materials suited to their specific functions, achieving high efficiency and longevity without requiring uniformly high driving voltage across the entire device.
Solution Approach 2:
The patent carefully controls the energy level parameters (HOMO and LUMO values) of the organic layer materials within optimal ranges. By adjusting these parameters, the invention achieves efficient charge injection and transport that improves device efficiency and lifespan while maintaining acceptable driving voltage levels.
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 organic light-emitting device results in improved efficiency, low driving voltage, high brightness, and extended lifespan by optimizing energy levels and charge transport within the device.
Implementation Method 1
Carriers, such as holes and electrons, are recombined in the emission layer to produce excitons. These excitons change from an excited state to a ground state, thereby generating light.
Data Source
AI summary
A condensed-cyclic compound of Formula 1:wherein, in Formula 1, groups X1, X11 to X14, L21, L22, R21, and R21, and variables a21, a22, b21, b22, c21, and c22 are described in the specification.