Condensed-Cyclic Compound for OLED Driving Voltage and Lifespan
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting devices (OLEDs) face challenges in achieving low driving voltage, high efficiency, high brightness, and long lifespan.
Innovation Solution
A condensed-cyclic compound represented by Formula 1 is used in the organic layer of OLEDs, which includes a specific structure that enhances thermal stability, electron and hole transfer, and allows for control of mobility, thereby improving device efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic compounds are used in OLEDs, then device structure is simpler, but driving voltage is high and efficiency is low
Solution Approach 1:
The patent changes the molecular parameters of organic compounds by introducing condensed-cyclic structures with specific heteroatoms (N, O, S) and functional groups. This modifies the HOMO-LUMO energy levels and molecular orbitals, enabling lower driving voltage operation while maintaining structural feasibility for OLED fabrication
Solution Approach 2:
The patent employs composite organic compounds that integrate multiple functional moieties within a single condensed-cyclic framework. These compounds combine electron-transport, hole-transport, and emission functionalities, achieving high efficiency and low voltage without requiring complex multi-layer device structures
2Illumination intensity
If conventional organic compounds are used in OLEDs, then manufacturing process is simpler, but luminance and efficiency are low
Solution Approach 1:
The patent segments the molecular design into modular condensed-cyclic units that can be systematically synthesized and combined. This modular approach allows control over luminance properties through specific structural motifs while maintaining relatively straightforward synthesis pathways using established organic chemistry methods
Solution Approach 2:
By adjusting molecular parameters such as conjugation length, heteroatom composition, and substituent groups in the condensed-cyclic compounds, the patent optimizes luminance output and quantum efficiency while keeping synthesis complexity at acceptable levels
3Duration of action of stationary object
If conventional organic compounds are used in OLEDs, then device structure is simpler, but lifespan is short
Solution Approach 1:
The patent modifies molecular stability parameters through condensed-cyclic structures with aromatic heteroatoms that resist degradation. The specific arrangement of N, O, and S atoms within fused ring systems enhances thermal and chemical stability, extending device lifespan while maintaining synthetically accessible molecular complexity
Solution Approach 2:
The patent develops organic compounds that replace unstable, short-lived materials with more stable condensed-cyclic structures. These compounds provide long-term operational stability without requiring expensive additional stabilization layers or complex protective device architectures
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 results in OLEDs with low driving voltage, high efficiency, high luminance, and extended lifespan, as demonstrated by simulations and experimental data.
Implementation Method 1
A host compound used in the emission layer may include a condensed-heterocyclic compound... enhances thermal stability, electron and hole transfer, and allows for control of mobility
Implementation Method 2
Holes provided from the anode may move toward the emission layer through the hole transport region, and electrons provided from the cathode may move toward the emission layer through the electron transport region. The holes and the electrons recombine in the emission layer to produce excitons. These excitons change from an excited state to a ground state to thereby generate light.
Data Source
AI summary
A condensed-cyclic compound represented by Formula 1:wherein, in Formula 1, Ar11, X1 to X8, and Z11 to Z14 are the same as described in the specification.