Organic Luminescence Display Panel Interface Stabilization
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Solution Overview
Problem
The lifetime of organic luminescence display devices is limited due to interface instability between the anode and the hole injection layer, leading to degradation and reduced luminous efficiency, as the buffer layer introduced to stabilize the interface increases driving voltage and hinders hole injection and transportation.
Innovation Solution
Incorporating a buffer layer made of a mixture of inorganic halide compounds with fluorine and organic materials between the electrode and the light emission layer, and an electron acceptor layer with strong electron accepting groups, along with a hole block material layer to facilitate smooth hole injection and transportation, and trap holes at the light emission layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer layer is provided between the anode and the hole injection layer to improve interface stability, then the lifetime of the OEL cell is improved, but the driving voltage increases and light emission efficiency decreases
Solution Approach 1:
The patent introduces an electron acceptor layer as an intermediary between the buffer layer and the light emission layer. This layer contains strong electron accepting action groups (cyanide, hydroxy, or halide groups) that facilitate hole injection and transportation while the buffer layer maintains interface stability. The electron acceptor layer acts as a mediator that resolves the contradiction by enabling efficient hole transport without requiring high driving voltage.
Solution Approach 2:
The patent employs composite material structures including the buffer layer made of inorganic halide compound mixed with organic material, and the electron acceptor layer with specific functional groups. These composite structures combine the benefits of different materials to achieve both interface stability and efficient hole injection, resolving the contradiction between reliability and power consumption.
2Reliability
If a buffer layer is provided to stabilize the interface, then the lifetime is improved, but the hole injection and transportation efficiency decreases
Solution Approach 1:
The electron acceptor layer serves as a mediator that bridges the buffer layer and the light emission layer. It contains strong electron accepting action groups that specifically facilitate hole injection and transportation, thus maintaining high productivity while the buffer layer ensures interface stability and reliability.
Solution Approach 2:
The patent applies different functional layers with specific local properties: the buffer layer provides interface stability at the anode interface, while the electron acceptor layer provides hole transportation functionality at the interface between the buffer layer and light emission layer. This local differentiation of functions resolves the contradiction between reliability and productivity.
3Reliability
If the interface between the anode and hole injection layer is unstable, then the lifetime is limited, but adding a buffer layer increases device complexity
Solution Approach 1:
The patent uses composite material structures where the buffer layer is formed by mixing inorganic halide compound with organic material. This composite approach achieves interface stability and improved lifetime while maintaining a relatively simple fabrication process, thus balancing reliability improvement with acceptable device complexity.
Solution Approach 2:
The patent modifies the chemical composition and functional groups of the layers (adding cyanide, hydroxy, or halide groups to the electron acceptor layer) to achieve stable interface and improved lifetime. These parameter changes are implemented through material selection rather than structural complexity, resolving the contradiction between reliability and device complexity.
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
This configuration enhances the stability of the interface, prevents thermal degradation, minimizes voltage requirements, and improves the luminous efficiency and lifetime of the organic luminescence display panel while maintaining efficient light emission.
Implementation Method 1
a buffer layer formed between the first electrode and the light emission layer of a mixture of an inorganic material of an inorganic halide compound having fluorine and an organic material for interface stabilization between the first electrode and the organic layer
Implementation Method 2
an electron acceptor layer of an organic material having a strong electron accepting action group selected from cyanide group —CN, —NC, hydroxy group —OH, or halide group —I, Br, —F for making hole injection and transportation between the buffer layer and the light emission layer easy
Implementation Method 3
a hole block material layer formed between the light emission layer and the second electrode of a mixture of a hole blocking material of Balq and an electron injection material of Liq, for trapping holes at the light emission layer
Data Source
AI summary
The present invention relates to an organic luminescence display panel and a method for fabricating the same which can improve a lifetime and luminous efficiency of an organic luminescence display device.The organic luminescence display panel includes a first electrode connected to a thin film transistor formed on a substrate, an organic layer having a light emission layer formed on the first electrode, a second electrode formed opposite to the first electrode with the organic layer disposed therebetween, a buffer layer formed between the first electrode and the light emission layer of a mixture of an inorganic material of an inorganic halide compound having fluorine and an organic material for interface stabilization between the first electrode and the organic layer, and an electron acceptor layer of an organic material having a strong electron accepting action group selected from cyanide group —CN, —NC, hydroxy group —OH, or halide group —I, Br, —F for making hole injection and transportation between the buffer layer and the light emission layer easy.