Organic EL Emitter Layer Using Composite A1 B1 Compounds
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Solution Overview
Problem
Conventional organic electroluminescence devices have insufficient performance, and there is a need to enhance luminous efficiency and reduce driving voltage by effectively utilizing specific combinations of materials in a single organic layer.
Innovation Solution
A composition comprising two kinds of compounds with specific structures, represented by formulas (A1) and (B1), is used to form an emitting layer in an organic electroluminescence device, where these compounds are different and include various substituents such as alkyl, alkenyl, and aryl groups, forming rings or unsaturated structures, to improve device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic EL devices use single materials in emitting layer, then device structure is simple, but luminous efficiency is insufficient and driving voltage is high
Solution Approach 1:
The patent employs composite materials by combining two different compounds (formula A1 and formula B1) in the emitting layer. Compound A1 contains a carbazole group and compound B1 contains a triphenylene group, creating a composite organic EL device that achieves enhanced luminous efficiency and reduced driving voltage compared to single-material devices.
2Reliability
If two kinds of materials are used in combination in emitting layer, then luminous efficiency improves and driving voltage reduces, but material selection and device fabrication become more complex
Solution Approach 1:
The patent utilizes parameter changes by carefully selecting the molecular structures of compounds A1 and B1, including their substituents (RA1-R A14, LB1, etc.), to optimize device performance. The specific chemical parameters of these compounds enable improved luminous efficiency and driving voltage while maintaining fabrication feasibility through standard organic EL device manufacturing processes.
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 these compounds enhances the external quantum efficiency and extends the device's lifetime while reducing the driving voltage, improving the overall performance of the organic electroluminescence device.
Implementation Method 1
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.
Data Source
AI summary
A composition including a compound represented by the formula (A1) (XA1 is O or S, ZA1 is a single bond or C) and a compound represented by the formula (B1) (XB1 is O, S, N, C) (provided that the compound represented by the formula (A1) and the compound represented by the formula (B1) are different compounds).