OLED Electron Transport Layer Using Dibenzofurane and Metal Complex
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving high efficiency, long operational lifetimes, thermal stability, and low operating voltage.
Innovation Solution
An organic electronic device is designed with an organic layer comprising an organic metal complex of specific formula and a compound, which serves as the electron transport layer, optimizing the device structure to include an anode, hole injection layer, hole transport layer, light emitting layer, exciton blocking layer, electron transport layer, and cathode, with the organic layer constituting the electron transport layer to enhance efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electron transport materials are used in OLEDs, then device structure is simple, but efficiency and operational lifetime are insufficient
Solution Approach 1:
The patent employs composite electron transport layers combining organic metal complexes (formula I) with dibenzofurane compounds (formulae II or III). This composite material approach achieves superior device efficiency and operational lifetime by leveraging the complementary properties of both materials, while maintaining a manageable layer structure through systematic material selection and combination.
2Loss of energy
If standard organic layers are used, then manufacturing is straightforward, but power efficiency and quantum efficiency are limited
Solution Approach 1:
The patent optimizes molecular parameters of the organic compounds used in the electron transport layer. By carefully selecting and adjusting structural parameters of the organic metal complex (formula I) and dibenzofurane compound (formulae II or III), the invention achieves enhanced power efficiency and quantum efficiency while maintaining feasibility of manufacturing through established organic electronics processes.
3Use of energy by moving object
If conventional materials are used in electron transport layer, then operating voltage is high, but device stability is adequate
Solution Approach 1:
The dibenzofurane compound (formulae II or III) acts as an intermediary material in the electron transport layer, working in conjunction with the organic metal complex (formula I). This intermediary approach enables reduced operating voltage while maintaining thermal stability, as the dibenzofurane compound mediates between the metal complex and the electrode, facilitating efficient electron transport with lower energy requirements and enhanced stability.
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 solution results in OLEDs with superior lifetime, power efficiency, quantum efficiency, and reduced operating voltage, as demonstrated by comparative examples showing improved performance metrics.
Implementation Method 1
an organic layer interposed between the first electrode and the second electrode, wherein the organic layer comprises an organic metal complex of formula I and a compound of formula II, or III... which serves as the electron transport layer
Implementation Method 2
The present invention provides an organic electronic device... superior lifetime, power efficiency, quantum efficiency, and reduced operating voltage... organic light-emitting devices
Data Source
AI summary
The present invention provides an organic electronic device including a first electrode, a second electrode, and an organic layer interposed between the first electrode and the second electrode, wherein the organic layer comprises an organic metal complex of formulaand a compound of formulaThe organic electronic device, especially an organic light emitting device can show superior life time, power efficiency, quantum efficiency and/or a low operating voltage.