OLED Intermediate Layer Enhances Luminance and Lifespan
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Solution Overview
Problem
Conventional OLEDs face limitations in improving efficiency and lifespan due to the technical constraints of the hole injection and transport layers, which hinder the effective supply of current to the emission layer.
Innovation Solution
Incorporating an intermediate layer between the first and second hole transport layers to enhance the current density and luminance, formed using a transition metal oxide such as MoO3, which improves the current supply to the emission layer under the same driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hole injection layer and hole transport layer are used, then the OLED structure is simple, but the efficiency and life span of the OLED are limited
Solution Approach 1:
The hole transport function is segmented into multiple layers: a first hole transport layer, an intermediate layer, and a second hole transport layer. This segmentation allows each layer to be optimized for specific functions, improving overall device reliability and lifespan while managing complexity through functional specialization.
Solution Approach 2:
An intermediate layer is introduced between the first and second hole transport layers to facilitate current supply to the emission layer. This intermediary layer acts as a mediator that enhances charge transport efficiency, thereby improving OLED efficiency and lifespan without requiring complete structural redesign.
2Productivity
If conventional hole transport layers are used, then the fabrication process is simple, but the current supply to the emission layer is insufficient
Solution Approach 1:
The hole transport system is divided into multiple functional layers with the intermediate layer positioned between the first and second hole transport layers. This segmentation enables enhanced current supply to the emission layer by creating optimized charge transport pathways through each specialized layer.
Solution Approach 2:
The intermediate layer serves as a mediator that improves current supply to the emission layer. It facilitates efficient charge transport between the first and second hole transport layers, thereby enhancing productivity in terms of current supply without requiring complete restructuring of the hole transport system.
3Illumination intensity
If conventional hole injection and transport layers are used, then the device structure is straightforward, but the luminance and efficiency are limited
Solution Approach 1:
The organic layer structure is segmented into multiple functional layers including the first hole transport layer, intermediate layer, and second hole transport layer. This segmentation enables optimized charge transport and recombination processes, leading to enhanced luminance and efficiency while managing structural complexity through functional specialization.
Solution Approach 2:
The intermediate layer acts as an intermediary that enhances luminance and efficiency by facilitating improved current supply to the emission layer. It mediates the charge transport process between the first and second hole transport layers, creating optimized conditions for light emission without requiring complete structural overhaul.
Data Source
AI summary
An organic light emitting diode (OLED) and a method of fabricating the same, in which an intermediate layer is formed between a first hole transport layer (HTL) and a second hole transport layer to facilitate supply of current to an emission layer (EML), thereby increasing the luminance and life span of the OLED. The OLED includes a first electrode, a hole injection layer (HIL) disposed on the first electrode, a first hole transport layer disposed on the hole injection layer, an intermediate layer disposed on the first hole transport layer, a second hole transport layer disposed on the intermediate layer, an emission layer disposed on the second hole transport layer, and a second electrode disposed on the emission layer.