Organic Light-Emitting Device Buffer Layer Fullerene
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Solution Overview
Problem
Organic light-emitting devices face challenges in reducing driving voltage without compromising efficiency and lifetime properties.
Innovation Solution
The implementation of a tandem structure in organic light-emitting devices, including a first and second organic light-emitting layer with a charge generation layer and a buffer layer containing fullerene compounds like C60, C70, C76, and C84, which helps in charge generation and transmission while preventing dopant diffusion during heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a tandem structure is implemented to lower driving voltage, then driving voltage is reduced, but efficiency and lifetime properties may deteriorate
Solution Approach 1:
A buffer layer comprising a fullerene compound is introduced as an intermediary between the charge generation layer and the second organic light-emitting layer. This buffer layer prevents dopant diffusion during heat treatment while maintaining charge generation and transmission, thereby resolving the contradiction between lowering driving voltage and maintaining efficiency/lifetime properties
Solution Approach 2:
The device employs a composite structure combining multiple functional layers including the charge generation layer with the fullerene-based buffer layer. This composite material approach allows the buffer layer to specifically address dopant diffusion issues while the overall tandem structure maintains low driving voltage operation
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 effectively lowers the driving voltage while maintaining efficiency and lifetime properties, as demonstrated by reduced dopant diffusion and improved operational stability.
Implementation Method 1
a buffer layer disposed between the charge generation layer and the second organic light-emitting layer and comprising a fullerene compound
Implementation Method 2
The organic light-emitting device may generate excitons by injecting holes provided by the anode and electrons provided by the cathode into the organic light-emitting layer so as for the holes and the electrons to be combined, and may generate light in response to the excitons returning to a ground state
Data Source
AI summary
An organic light-emitting device comprises a first electrode, a second electrode disposed on the first electrode, a first organic light-emitting layer disposed between the first electrode and the second electrode, a second organic light-emitting layer disposed between the first organic light-emitting layer and the second electrode, a first charge generation layer (CGL) disposed between the first organic light-emitting layer and the second organic light-emitting layer, a second CGL disposed between the first CGL and the second organic light-emitting layer, and a first buffer layer disposed between the first CGL and the second CGL and including fullerene.