Organic Light Emitting Device Host Material Composition
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Solution Overview
Problem
There is a continuous need to develop new materials for organic light emitting devices to enhance efficiency, driving voltage, and lifetime characteristics.
Innovation Solution
An organic light emitting device is designed with a light emitting layer comprising a first indolocarbazole compound as a P-type host, a second indolocarbazole-based compound as an N-type host, and a third compound with a dibenzofuran/dibenzothiophene structure, which efficiently transports holes and electrons, improving recombination probability and device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single host compound or conventional host compounds are used in the light emitting layer, then the device structure is simple, but the efficiency, driving voltage, and lifetime characteristics are insufficient
Solution Approach 1:
The patent employs a composite host system comprising two distinct host compounds (first host compound and second host compound) in the light emitting layer. This composite material approach enables synergistic effects where the first host compound primarily transports holes and the second host compound primarily transports electrons, resulting in improved device efficiency, optimized driving voltage, and extended lifetime characteristics that cannot be achieved with single host compounds alone.
2Reliability
If conventional host compounds are used, then the material selection is straightforward, but the recombination probability and device performance are limited
Solution Approach 1:
The patent assigns different functional characteristics to different host compounds within the light emitting layer. The first host compound is specifically selected for its superior hole transport capability, while the second host compound is selected for its superior electron transport capability. This local differentiation of functional quality within the composite host system optimizes charge carrier transport and recombination processes, thereby enhancing device reliability and lifetime without requiring complex single-material structures.
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 host compounds in the light emitting layer results in lower driving voltage, higher efficiency, and longer lifetime characteristics compared to devices using single or different host compounds, demonstrating a synergistic effect on voltage, efficiency, and stability.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
AI summary
Provided is an organic light emitting device comprising: a positive electrode; a negative electrode opposite the positive electrode; and a light emitting layer between the positive electrode and negative electrode, wherein the light emitting layer comprises a first compound of Chemical Formula 1, a second compound of Chemical Formula 2, and a third compound of Chemical Formula 3 as defined in the specification: