Organic Compound Host Material for OLED Efficiency and Voltage
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Solution Overview
Problem
Current organic electroluminescence (OLED) devices face limitations in current efficiency, driving voltage, and half-life, necessitating improvements in organic compounds used in these devices.
Innovation Solution
An organic compound with a specific formula, comprising a divalent bridge and substituted or unsubstituted aryl groups, is used as a host or hole blocking layer in OLED devices, enhancing current efficiency and extending the device's half-life while reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic compounds are used in OLED devices, then the device structure is simple, but the current efficiency is low, driving voltage is high, and half-life is short
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of organic compounds through varying substituents (R1-R8), bridge groups (P, Q), and ring systems (A, B) in formula (C). These structural parameter changes optimize electron transport and hole blocking properties, achieving higher current efficiency at lower driving voltages as demonstrated in Examples 1-23 where compounds with different substituent patterns show improved device performance
Solution Approach 2:
The patent employs composite materials by designing organic compounds that combine multiple functional moieties within a single molecular structure. The compounds in formula (C) integrate electron-transporting groups, hole-blocking groups, and various bridge structures to create multifunctional materials that simultaneously improve current efficiency and reduce driving voltage, as evidenced by the performance data in Tables 1-3
2Duration of action of stationary object
If conventional organic compounds are used in OLED devices, then the device structure is simple, but the half-life is short
Solution Approach 1:
The patent uses composite materials by creating organic compounds with integrated multifunctional units in formula (C). The combination of specific bridge groups (P, Q), ring systems (A, B), and substituents (R1-R8) forms composite molecular structures that provide both long-term stability for extended half-life and the necessary complexity for optimized device performance, as shown in the comparative data across Examples 1-23
Solution Approach 2:
The patent applies local quality by positioning specific functional groups at particular locations within the molecular structure of formula (C). The strategic placement of electron-transporting and hole-blocking groups at specific positions (indicated by R1-R8 and the core structure) creates localized functional zones that enhance device stability and half-life while managing the overall molecular complexity
3Reliability
If organic compounds with improved performance are used, then current efficiency increases and half-life extends, but the compound structure becomes more complex
Solution Approach 1:
The patent applies universality by designing organic compounds in formula (C) that perform multiple functions simultaneously. Each compound integrates electron transport, hole blocking, and charge recombination functions within a single molecular structure, reducing the need for separate functional layers and simplifying overall device architecture while maintaining high reliability and performance as demonstrated in the device examples
Data Source
AI summary
An organic compound is described. An organic electroluminescence device comprises the organic compound, as a host of an emissive layer, or as a hole blocking layer. The organic compound may increase a half-life or current efficiency of the organic electroluminescence device. The organic compound may lower a driving voltage of the organic electroluminescence device. The mentioned organic compound may have the following formula:The same definition as described in the present invention.