Segmented Emission Layer Doping for Uniform OLED Emission
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Solution Overview
Problem
Existing technologies have not effectively addressed the uniformity of emission layers in light-emitting devices, leading to non-uniformity in emission characteristics and device characteristics, resulting in inefficient performance.
Innovation Solution
The emission layer is designed with a uniform concentration of the second dopant in the emission layer, which includes a first host, a second host, and a first dopant, and a second dopant, and a second dopant, with specific thicknesses and dopant concentrations to achieve uniform emission and improved device characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the emission layer is designed with uniform concentration of second dopant, then emission uniformity is improved, but device complexity increases
Solution Approach 1:
The emission layer is divided into multiple sub-layers (first emission layer, second emission layer, third emission layer) with different dopant concentrations. The first and third emission layers have higher second dopant concentration (y1) while the second emission layer has lower second dopant concentration (y2), creating a segmented concentration profile that achieves uniform overall emission while managing complexity through systematic layering
Solution Approach 2:
Different regions of the emission layer are assigned different dopant concentrations to optimize local emission characteristics. The first and third emission layers have concentration y1 while the second emission layer has concentration y2, where y2 < y1. This local differentiation ensures uniform emission across the entire emission layer while reducing the need for overly complex structures
2Reliability
If multiple emission layers with different dopant concentrations are used, then emission characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the thickness parameters of each emission layer (a, b-a, and x-b) and dopant concentration parameters (y1, y2) to achieve uniform emission. By controlling these parameters within specific ranges, the patent achieves improved emission characteristics while maintaining manufacturability through standardized fabrication processes
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
The solution enhances the uniformity of the emission layer, resulting in improved emission characteristics and reduced energy transfer, enhancing the efficiency and performance of the light-emitting device.
Implementation Method 1
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. When the excitons transition from an excited state to a ground state, light is emitted.
Implementation Method 2
the second dopant may emit delayed fluorescence
Data Source
AI summary
Embodiments provide a light-emitting device and an electronic apparatus including the same. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an emission layer between the first electrode and the second electrode, a hole transport region between the first electrode and the emission layer, and an electron transport region between the emission layer and the second electrode. The emission layer includes a first emission layer, a second emission layer, and a third emission layer, which are sequentially arranged from the hole transport region, wherein the second emission layer has a different configuration from the first emission layer and third emission layer.