OLED Hole Injection Layer Composite Material Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing organic light-emitting display panels face poor performance due to a high interfacial energy barrier between the hole injection layer and the anode, which limits hole injection capacity.
Innovation Solution
Incorporating a hole injection layer made of an organic material and a conductive metal oxide, or forming the layer by stacking an organic material film layer and a conductive metal oxide film layer, to lower the interfacial energy barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hole injection layer is used in the organic light-emitting display panel, then the device structure is simple, but the interfacial energy barrier between the hole injection layer and the anode is too high, resulting in poor hole injection capacity and low display performance
Solution Approach 1:
The patent applies composite materials by combining organic material and conductive metal oxide in the hole injection layer. This composite structure lowers the interfacial energy barrier between the hole injection layer and the anode, significantly improving hole injection capacity while maintaining a relatively simple overall device structure. The conductive metal oxide component provides enhanced electrical conductivity and facilitates charge transport.
Solution Approach 2:
The patent changes the material composition parameters of the hole injection layer by incorporating conductive metal oxide alongside organic material. This parameter change directly addresses the high interfacial energy barrier issue by modifying the electrical and energetic properties of the hole injection layer, enabling better energy level matching with the anode and improving hole injection efficiency.
2Use of energy by moving object
If the interfacial energy barrier between the hole injection layer and the anode is high, then the device structure remains conventional, but the required bias voltage is high and the light-emitting efficiency and lifetime are poor
Solution Approach 1:
By using composite materials consisting of organic material and conductive metal oxide in the hole injection layer, the patent achieves better energy level alignment with the anode. This reduces the interfacial energy barrier, allowing for lower bias voltage operation while simultaneously improving light-emitting efficiency and device lifetime through enhanced charge injection and transport.
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 approach enhances hole injection capacity and overall performance by reducing the required bias voltage and improving light-emitting efficiency and lifetime of the organic light-emitting display panel.
Implementation Method 1
by setting that the material of the hole injection layer includes an organic material and a conductive metal oxide, or the hole injection layer is formed by stacking an organic material film layer and a conductive metal oxide film layer, it can solve the problems of the existing organic light-emitting display panels that the interfacial energy barrier between the hole injection layer and the anode is too high
Implementation Method 2
During operation, a bias voltage is applied between the anode and the cathode of the organic light-emitting display panel, so that holes and electrons can break through the interfacial energy barrier and migrate respectively from the hole transport layer and the electron transport layer to the light-emitting layer
Implementation Method 3
on the light-emitting layer, electrons and holes are recombined to generate excitons. The excitons are unstable, and energy can be released. The energy is transferred to the molecules of the organic light-emitting material in the light-emitting layer, so that the molecules transit from a ground state to an excited state. The excited state is very unstable, and thus the excited molecules return to the ground state from the excited state, so that a light emitting phenomenon appears due to radiative transition
Data Source
AI summary
Embodiments of the present invention disclose an organic light-emitting display panel and an organic light-emitting display device. The organic light-emitting display panel includes: a first electrode, a hole injection layer, a light-emitting layer and a second electrode that are stacked in turn; wherein, the material of the hole injection layer includes an organic material and a conductive metal oxide, or the hole injection layer is formed by stacking an organic material film layer and a conductive metal oxide film layer.