Hetero-Cyclic Compound for OLED Driving Voltage and Lifetime
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Solution Overview
Problem
Current organic light emitting devices face challenges in enhancing performance, lifetime, and efficiency, particularly in reducing driving voltage and improving thermal stability.
Innovation Solution
Incorporation of a hetero-cyclic compound as a material for layers such as hole injection, hole transfer, light emitting, electron transfer, or charge generation in the organic light emitting device, which lowers driving voltage, enhances light efficiency, and improves thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional organic thin film materials are used, then the device can operate, but the driving voltage is high and lifetime is short
Solution Approach 1:
The patent changes the chemical structure parameters of the organic thin film material by introducing specific hetero-cyclic compounds with defined molecular structures (Formulae 1-6) containing heteroatoms (N, O, S) and specific substituents. This chemical parameter change optimizes the material's electrical and thermal properties, resulting in reduced driving voltage and extended device lifetime while maintaining operational functionality.
Solution Approach 2:
The patent employs composite material design by combining hetero-cyclic core structures with various substituents (R1-R6 groups) to create multifunctional organic compounds. These composite molecular structures integrate multiple functions (charge transport, hole injection, electron blocking) within a single material system, achieving both low driving voltage and high lifetime performance.
2Stability of the object's composition
If conventional organic materials are used, then the device functions, but thermal stability is insufficient
Solution Approach 1:
The patent modifies the thermal stability parameter by incorporating hetero-cyclic structures with strong chemical bonds and specific molecular geometries (Formulae 1-6). The heteroatoms (N, O, S) form rigid six-membered rings that enhance thermal resistance, allowing the material to maintain structural integrity at elevated temperatures and ensuring consistent device performance over time.
3Loss of energy
If standard organic thin film materials are used, then the device can emit light, but light efficiency is low
Solution Approach 1:
The patent optimizes light efficiency by changing the optical and electronic parameters of the organic material through hetero-cyclic compound design. The molecular structures (Formulae 1-6) are engineered to achieve optimal HOMO-LUMO energy gaps and charge carrier dynamics, reducing non-radiative recombination losses and enhancing radiative recombination that produces light, thereby improving overall light efficiency and output.
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 hetero-cyclic compound results in reduced driving voltage, increased light efficiency, and improved thermal stability, thereby enhancing the overall performance and longevity of the organic light emitting device.
Implementation Method 1
When a voltage is applied to an organic light emitting device having such a structure, electrons and holes injected from the two electrodes bind and pair in the organic thin film, and light emits as these annihilate.
Data Source
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AI summary
The present application provides a hetero-cyclic compound capable of greatly enhancing a lifetime, efficiency, electrochemical stability and thermal stability of an organic light emitting device, and an organic light emitting device containing the hetero-cyclic compound in an organic compound layer.