OLED Hole-Transport Layer Materials for Lower Voltage and Longer Life
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Solution Overview
Problem
Existing organic electroluminescent devices (OLEDs) face challenges in improving performance data such as lifetime, efficiency, and operating voltage, particularly in layers with hole-transporting functions, and there is a need for new materials and device constructions to enhance these aspects.
Innovation Solution
Incorporating specific xanthene or thioxanthene compounds in a layer adjoining the anode or between this layer and the emitting layer, with a compound formula (I) that includes arylamino or carbazole-containing groups, to form a hole-transporting layer, thereby enhancing the performance of OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hole-transporting materials are used in OLEDs, then device construction is simpler, but performance data (lifetime, efficiency, operating voltage) are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of hole-transporting materials through specific molecular designs (compounds of formula I with defined substituents). This changes the electrical and optical parameters of the material to achieve lower operating voltage and higher efficiency while maintaining device construction simplicity
Solution Approach 2:
The patent employs composite materials by combining xanthene or thioxanthene core structures with various aromatic substituents (formula I). This creates composite molecular structures that integrate multiple functional properties (hole transport, stability, low voltage operation) into a single material system
2Productivity
If existing hole-transporting compounds are used, then material selection is easier, but efficiency and operating voltage performance are inadequate
Solution Approach 1:
The patent systematically varies molecular parameters (substituent types, positions, and combinations in formula I) to optimize charge transport efficiency and reduce operating voltage. This structured parameter exploration enables high efficiency while providing clear material selection criteria
Solution Approach 2:
The patent segments the molecular structure into distinct functional components: the xanthene/thioxanthene core (formula I) and various aromatic substituents (R1-R6 groups). This segmentation allows independent optimization of different material properties and facilitates systematic material selection
3Use of energy by stationary object
If new xanthene or thioxanthene compounds are incorporated in the hole-transporting layer, then operating voltage is reduced and lifetime is extended, but the device requires specific layer configurations
Solution Approach 1:
The patent applies local quality by placing the new xanthene/thioxanthene compounds (formula I) specifically in the hole-transporting layer adjacent to the anode. This localized application of improved material quality achieves lower operating voltage and extended lifetime without requiring changes to the entire device structure
Data Source
AI summary
The present application relates to an electronic device comprising a xanthene or thioxanthene compound of a particular formula. The electronic device is preferably an organic electroluminescent device (OLED). The application further relates to particular xanthene or thioxanthene compounds as such, and to the use thereof in the abovementioned devices, and to processes for preparation thereof.