Organic Pin-Type OLED Simplified Layer Structure
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Solution Overview
Problem
Existing organic pin-type light-emitting diodes (OLEDs) face inefficiencies due to exciplex formation and luminescence quenching, which reduce quantum yield and require complex layer structures with multiple organic materials, leading to increased manufacturing costs and complexity.
Innovation Solution
A simplified layer structure for organic pin-type OLEDs is achieved by using a single organic matrix material for multiple layers, including the emission layer, doped charge carrier transport layers, and block layers, reducing the number of organic matrix materials and layers while maintaining efficiency, and optimizing energy levels to prevent quenching effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple different organic matrix materials are used for different layers (emission layer, charge carrier transport layers, block layers), then the quantum yield and light-emitting efficiency are improved by preventing exciplex formation and luminescence quenching, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by using a single organic matrix material that performs multiple functions across different layers (emission layer, charge carrier transport layers, and block layers). This matrix material is designed to prevent exciplex formation and luminescence quenching while maintaining high quantum yield, thereby reducing device complexity and manufacturing cost without sacrificing performance
Solution Approach 2:
The patent employs parameter changes by carefully selecting and optimizing the energy levels (HOMO and LUMO) of the single organic matrix material used across multiple layers. By adjusting these energy level parameters, the patent prevents charge carrier accumulation at interfaces, eliminates exciplex formation, and maintains high quantum yield throughout all layers despite using the same material
2Use of energy by moving object
If multiple different organic matrix materials are used for different layers, then the light-emitting efficiency is improved by optimizing energy levels for charge carrier transport and emission, but the manufacturing process complexity and number of sources increase
Solution Approach 1:
The patent uses a single organic matrix material that serves multiple functions in different layers, including charge carrier transport, emission, and blocking. This universality simplifies the manufacturing process by reducing the number of different materials and sources required, while the energy levels of this material are optimized to maintain high light-emitting efficiency
Solution Approach 2:
The patent merges the functions of multiple different organic matrix materials into a single material that can perform charge carrier transport, emission, and blocking roles across all layers. This consolidation reduces manufacturing complexity and the number of sources needed while maintaining optimized energy levels for efficient light emission
3Reliability
If doped charge carrier transport layers are used to improve charge carrier injection and transport, then the conductivity is improved and voltage decline is reduced, but exciplex formation and luminescence quenching occur when dopants are in immediate vicinity of emission zone
Solution Approach 1:
The patent introduces block layers composed of the same organic matrix material as intermediaries between the doped charge carrier transport layers and the emission zone. These block layers act as buffer zones that prevent direct contact between dopants and the emission zone, thereby eliminating exciplex formation and luminescence quenching while maintaining efficient charge carrier transport through the doped layers
Solution Approach 2:
The patent segments the device structure by introducing distinct block layers between the charge carrier transport layers and the emission zone. This segmentation separates the doped regions (for efficient transport) from the emission zone, preventing harmful interactions while maintaining the benefits of doping
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 simplified structure enables high-efficiency light-emitting diodes with reduced manufacturing complexity and costs, as the same organic matrix material is used for several layers, minimizing the number of sources and processing steps, and maintaining high brightness and efficiency comparable to complex structures.
Implementation Method 1
They comprise a series of thin layers of organic materials which are preferably vapour-deposited in a vacuum or spin-coated in their polymer form
Implementation Method 2
They comprise a series of thin layers of organic materials which are preferably vapour-deposited in a vacuum or spin-coated in their polymer form
Implementation Method 3
by means of the injection of charge carriers, namely electrons from the one side and holes from the other, from the contacts into the adjoining organic layers as a result of an externally applied voltage
Implementation Method 4
the radiating recombination of these excitons, light is generated and emitted from the light-emitting diode
Data Source
AI summary
The invention relates to an arrangement for an organic pin-type light-emitting diode with an electrode and a counter-electrode and a stack with organic layers between the electrode and the counter-electrode, where the stack with the organic layers comprises an emission layer comprising a k (k=1, 2, 3, . . . ) organic matrix materials, a doped charge carrier transport layer, which is arranged between the electrode and the emission layer, a further doped charge carrier transport layer, which is arranged between the counter-electrode and the emission layer, and one block layer, which is arranged between one of the doped charge carrier transport layers and the emission layer. The organic layers of the stack are formed by means of n (n≦k+2) organic matrix materials, where the n organic matrix materials comprise the k organic matrix materials of the emission layer. The stack with the organic layers can also be executed in a block-layer-free manner, where then the emission layer and the doped charge carrier transport layer are formed from an organic matrix material. Furthermore, a method for manufacturing such arrangements is stated.