Condensed-Cyclic Compound for OLED Hole Transport Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light-emitting devices require improvement in driving voltage, light-emitting efficiency, and lifetime.
Innovation Solution
A condensed-cyclic compound represented by Formula 1 is used in the hole transport layer of an organic light-emitting device, which includes a specific structure with bicyclic aromatic rings and various substituents, enhancing charge transport capability and reducing driving voltage while increasing efficiency and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic light-emitting devices are used, then the device structure is simple and easy to manufacture, but the driving voltage is high, light-emitting efficiency is low, and lifetime is short
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of organic compounds in the hole transport layer. Specifically, it uses condensed-cyclic compounds with specific molecular structures (Formula 1) that have optimized HOMO/LUMO energy levels, electron mobility, and charge transport properties. This structural parameter optimization enables lower driving voltage, higher efficiency, and longer lifetime while maintaining device simplicity
Solution Approach 2:
The patent employs composite materials by combining the condensed-cyclic compound (Formula 1) with other organic materials in the hole transport layer. The compound is used in combination with materials like TPD, NPB, or TAPC, creating a composite system that synergistically improves charge transport capability, reduces driving voltage, and enhances overall device performance and longevity
2Ease of manufacture
If conventional hole transport layer materials are used, then the device is easy to manufacture, but the charge transport capability is insufficient leading to high driving voltage
Solution Approach 1:
The patent changes the key parameter of hole transport capability by introducing condensed-cyclic compounds with optimized molecular structures. These compounds have specific HOMO energy levels and electron mobility characteristics that enhance charge transport efficiency, directly reducing the driving voltage required for device operation while maintaining ease of manufacture through standard deposition processes
3Device complexity
If conventional hole transport layer materials are used, then the device structure remains simple, but the light-emitting efficiency is low
Solution Approach 1:
The patent optimizes light-emitting efficiency by changing the molecular parameters of the hole transport layer materials. The condensed-cyclic compounds (Formula 1) are designed with specific structural parameters including bicyclic aromatic rings and heteroatom substitutions that enhance charge carrier mobility and recombination efficiency, leading to higher light output without increasing device structural complexity
Solution Approach 2:
The patent creates composite material systems combining condensed-cyclic compounds with conventional hole transport materials. This composite approach leverages the advantages of both material types, achieving superior light-emitting efficiency through enhanced charge transport and recombination properties while maintaining the simplicity of the overall device structure
4Ease of manufacture
If conventional hole transport layer materials are used, then the device can be manufactured with standard processes, but the lifetime is short
Solution Approach 1:
The patent extends device lifetime by changing the chemical stability parameters of the hole transport layer materials. The condensed-cyclic compounds (Formula 1) incorporate structurally stable bicyclic aromatic rings and heteroatom substitutions that resist degradation from electrical stress, thermal effects, and environmental factors, thereby extending operational lifetime while remaining compatible with standard manufacturing processes
Data Source
AI summary
A condensed-cyclic compound represented by Formula 1 below, an organic light-emitting device including the same, and a flat panel display apparatus including the organic light-emitting device:wherein, X, Y, A1, A2, L1, L2, L3, Ar1, R1, R2, R3, R4, R5, R6, a, b, c, d, e, f, and g are described in the detailed description of the invention. The organic light-emitting device including an organic layer including the compound above has low driving voltage, high emission efficiency, and long lifetime.