Heterocyclic Compound for OLED Efficiency and Stability
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Solution Overview
Problem
There is a continuous need for developing new materials to improve the efficiency and stability of organic light emitting devices, particularly in terms of reducing driving voltage and enhancing the service life.
Innovation Solution
A hetero ring-containing compound, specifically a compound of Chemical Formula 1, is used in the organic material layer of an organic light emitting device, which includes a direct bond or substituted arylene groups, with specific configurations and substitutions that enhance electron mobility and stability, allowing for low driving voltage and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in the organic material layer, then the device structure is simple, but the efficiency is low and service life is short
Solution Approach 1:
The patent employs composite organic materials comprising multiple functional layers with different compositions (hole injection layer, hole transport layer, light emitting layer, electron transport layer, electron injection layer) to achieve both high efficiency and long service life. Each layer is specifically designed with materials having complementary properties that work synergistically to improve overall device performance while extending operational duration.
2Productivity
If multi-layered organic material structure is used to improve efficiency, then efficiency improves, but device complexity increases
Solution Approach 1:
The organic material layer is segmented into five distinct functional layers, each with specific materials and thicknesses optimized for its particular function. This segmentation allows each layer to be independently optimized for its specific role (hole injection, transport, light emission, electron transport, electron injection) while collectively achieving high overall efficiency without requiring overly complex structures.
3Reliability
If conventional materials are used, then manufacturing is simple, but quantum efficiency decreases over time
Solution Approach 1:
The patent optimizes specific parameters of the organic materials including molecular weight, glass transition temperature, HOMO-LUMO energy levels, and carrier mobility to maintain stable quantum efficiency over time. By carefully controlling these material parameters and selecting compounds within specific ranges, the device achieves reliable long-term performance while keeping manufacturing processes manageable through well-established synthesis methods.
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 compound improves the efficiency and service life of organic light emitting devices by regulating electron injection characteristics and preventing decreases in quantum efficiency, resulting in high efficiency and long service life characteristics.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material
Data Source
AI summary
Provided is a heterocyclic compound of Chemical Formula 1:[Chemical Formula 1]wherein: L1 is a direct bond or a substituted or unsubstituted arylene group; L2 is a substituted or unsubstituted arylene group; two or more of X1 to X3 are N and any remaining is CR′; Np is Chemical Formula 2:[Chemical Formula 2]wherein: the dotted lines “------” are positions of attachment of Chemical Formula 2 where one is bonded to L1 and the other is bonded to L2 of Chemical Formula 1; and the other substituents are as defined in the specification; and an organic light-emitting device including the same. A light emitting device that includes the compound of Chemical Formula 1 in an organic material layer exhibits high efficiency and long service life.