OLED Light-Emitting Layer Segmentation for Exciton Quenching
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Solution Overview
Problem
Existing organic light-emitting diode (OLED) display devices have a limited service lifespan due to high concentrations of excitons in the light-emitting layers, leading to exciton quenching and thermal radiation.
Innovation Solution
The organic light-emitting display panel incorporates a light-emitting layer composed of multiple light-emitting units, each unit consisting of a first and second light-emitting sublayer, both of which are either host or guest material layers, with a third light-emitting sublayer of the opposite type in between. This structure disperses exciton recombination regions, reducing exciton concentration and quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional doped light-emitting layer with host and guest materials is used, then the device achieves light emission function, but the service lifespan is limited due to high exciton concentration and quenching
Solution Approach 1:
The light-emitting layer is segmented into multiple light-emitting units arranged in layers, where each unit contains alternating host material layers and guest material layers. This segmentation disperses the exciton recombination regions across multiple interfaces, reducing exciton concentration in any single region and minimizing quenching effects, thereby extending device lifespan
Solution Approach 2:
The patent transitions from a traditional homogeneous doped layer to a vertically stratified multi-layer structure. By organizing host and guest material layers in alternating sequences along the vertical dimension, the patent creates multiple exciton recombination interfaces distributed in space, effectively reducing exciton concentration and preventing quenching while maintaining light emission functionality
2Device complexity
If host and guest materials are doped together in a homogeneous layer, then the structure is simple, but exciton quenching and thermal radiation occur due to high exciton concentration
Solution Approach 1:
The homogeneous doped layer is divided into multiple alternating host and guest material layers, creating distinct regions for exciton generation and recombination. This segmentation reduces exciton concentration in each region, minimizing non-radiative recombination and thermal radiation losses
Solution Approach 2:
Different regions of the light-emitting layer are assigned different functions: host material layers serve as exciton generation regions while guest material layers serve as exciton recombination and light emission regions. This local differentiation optimizes energy utilization and reduces exciton quenching losses
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 prolongs the service lifespan of the OLED display device by reducing exciton quenching and thermal radiation, while also improving luminous efficiency.
Implementation Method 1
the host materials with higher energy transfer the energy to the guest light-emitting materials to emit light
Implementation Method 2
exciton recombination regions are formed only at an interface between the host material layer and the guest material layer
Data Source
AI summary
The present disclosure provides an organic light-emitting display panel and an organic light-emitting display device. The organic light-emitting display panel includes a light-emitting layer. The light-emitting layer includes at least two light-emitting units arranged in layers. Each of the light-emitting units includes a first light-emitting sublayer and a second light-emitting sublayer which are both one of a host material layer and a guest material layer, and a third light-emitting sublayer that is another one of the host material layer and the guest material layer. The third light-emitting sublayer is disposed between the first light-emitting sublayer and the second light-emitting sublayer.