Electroluminescent Device Regulating Electron Mobility
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Solution Overview
Problem
The electron mobility of electron transport layers in electroluminescent devices is often significantly higher than that of hole transport layers, limiting material selection for the hole transport layer and increasing production costs due to the need for specific materials to manage electron current and maintain luminous efficiency.
Innovation Solution
Incorporating a regulating structure within the electron transport layer, such as a second film layer with low conductivity and electron mobility, to adjust and match the electron mobility with that of the hole transport layer, allowing for a broader range of material choices and improved luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electron transport layer uses high electron mobility materials, then the electron transport efficiency is improved, but the material selection for the hole transport layer is limited and production cost increases
Solution Approach 1:
The electron transport layer is divided into multiple sub-layers with different functions: a first electron transport sub-layer in contact with the light-emitting layer for efficient electron injection, and a second electron transport sub-layer in contact with the hole transport layer for mobility regulation. This segmentation allows each sub-layer to be optimized independently, resolving the contradiction between high electron mobility and material selection flexibility.
Solution Approach 2:
Different regions of the electron transport layer are assigned different material properties. The first electron transport sub-layer uses materials with high electron mobility to ensure efficient electron transport toward the light-emitting layer, while the second electron transport sub-layer uses materials with lower electron mobility to match the hole transport layer's characteristics. This local quality differentiation allows the system to achieve both high overall electron mobility and compatibility with various hole transport layer materials.
2Speed
If the electron mobility of electron transport layer is much higher than hole mobility, then electron transport is efficient, but carrier balance is poor and luminous efficiency decreases
Solution Approach 1:
The patent introduces a dynamic regulation mechanism by incorporating a regulating structure (such as a regulating layer or doping elements) within the electron transport layer. This regulating structure allows the electron mobility to be dynamically adjusted or modulated to achieve optimal carrier balance. The regulating structure can be tuned to match the hole mobility characteristics, ensuring that electrons and holes are injected and transported at balanced rates, thereby maintaining high luminous efficiency while preserving efficient electron transport.
Data Source
AI summary
An electroluminescent device and a manufacturing method thereof, and a display apparatus are provided. The electroluminescent device includes a base substrate; and an electron transport layer, disposed on the base substrate, the electron transport layer includes a first film layer for transporting electrons and a regulating structure arranged in contact with the first film layer, and the regulating structure is configured to regulate an electron mobility of the electron transport layer.