Organic Electronic Devices Nitrogen-Containing CGL Metal Diffusion
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Solution Overview
Problem
Tandem OLED devices face challenges with poor electron-injection efficiency in N-type charge generation layers (CGLs) due to energy level differences and metal diffusion, leading to reduced device lifetime and efficiency.
Innovation Solution
The use of organic compounds with nitrogen atoms and specific structural features that form a gap state, reducing energy level differences and preventing metal diffusion, thereby enhancing electron-injection efficiency and thermal stability in N-type CGLs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a PN junction CGL with alkali or alkaline earth metals is used, then charge generation and distribution are improved, but metal diffusion occurs leading to shortened device lifetime
Solution Approach 1:
The patent removes the harmful metal dopants (alkali or alkaline earth metals) from the N-type CGL while retaining the charge generation function through organic compounds with nitrogen atoms that form gap states, thereby eliminating metal diffusion without sacrificing current efficiency
Solution Approach 2:
The patent changes the chemical composition parameter of the N-type CGL from metal-based to organic nitrogen-containing compounds, which alters the energy level structure to reduce the energy level difference with the P-type CGL and prevents metal diffusion while maintaining charge generation capability
2Productivity
If energy level difference between N-type and P-type CGL is large, then charge generation is enhanced, but electron-injection efficiency deteriorates
Solution Approach 1:
The patent modifies the energy level parameter of the N-type CGL by using organic compounds with nitrogen atoms that create gap states, thereby reducing the energy level difference between N-type and P-type CGLs to improve electron-injection efficiency while maintaining adequate charge generation
3Ease of manufacture
If conventional CGL materials are used, then device fabrication is straightforward, but thermal stability is insufficient
Solution Approach 1:
The patent employs composite organic compounds containing nitrogen atoms with specific molecular structures (including aromatic groups and various substituents) that provide both ease of fabrication and enhanced thermal stability through strong chemical bonding and rigid molecular frameworks
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 proposed solution results in organic electronic devices with low voltage, high efficiency, and extended device lifetime by improving electron injection and mobility, while maintaining thermal stability.
Implementation Method 1
The organic electroluminescent phenomenon refers to a phenomenon of converting electrical energy to photonic energy with organic substances
Implementation Method 2
The N-containing organic compound can coordinate with the alkali metal or alkaline earth metal compound in the N-type CGL, preventing the alkali metal or alkaline earth metal compound from diffusing into the P-type CGL
Data Source
AI summary
Disclosed are organic electronic devices including a cathode, an anode, at least two light-emitting layers disposed between the cathode and the anode, and a charge generation layer (CGL) disposed between the adjacent two light-emitting layers, the CGL includes an organic compound of formula (I). Also provided are compounds containing a structure of formula (1). Further provided are organic electronic devices comprising at least one compound.