OLED Light-Emitting Layer Carrier Balance Material Doping
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Solution Overview
Problem
Current OLED display devices, particularly blue sub-pixels, suffer from low light-emitting efficiency due to uneven exciton recombination caused by disparate electron and hole mobilities in the light-emitting layer, leading to biased exciton distribution and reduced light output.
Innovation Solution
Incorporating a carrier balance material doped into the host light-emitting material to balance electron and hole mobilities within the light-emitting layer, either uniformly or with varying concentration across the layer's thickness, to ensure balanced exciton recombination and improved light-emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light-emitting layer with host light-emitting material is used, then the device structure is simple, but the light-emitting efficiency is low due to uneven exciton recombination caused by disparate electron and hole mobilities
Solution Approach 1:
The patent changes the material composition parameter of the light-emitting layer by introducing a carrier balance material doped into the host light-emitting material. This doping modifies the charge carrier mobility parameters within the layer, enabling balanced electron and hole transport. The result is uniform exciton recombination distribution throughout the light-emitting layer, significantly improving light-emitting efficiency without complicating the overall device structure
Solution Approach 2:
The patent creates a composite light-emitting layer material system by combining the host light-emitting material with a carrier balance material. This composite structure leverages the light-emitting properties of the host material while the doped carrier balance material provides balanced charge transport. The synergistic combination resolves the contradiction between structural simplicity and high light-emitting efficiency
2Productivity
If carrier balance material is doped into host light-emitting material, then light-emitting efficiency is improved, but material composition complexity increases
Solution Approach 1:
The patent optimizes the doping concentration parameter of the carrier balance material within a specific range (0.1%-50% by weight). By controlling this parameter, the patent achieves balanced carrier mobility and uniform exciton recombination, improving light-emitting efficiency. The controlled parameter approach prevents excessive material complexity while maintaining performance benefits
3Device complexity
If exciton recombination is biased due to unequal carrier mobilities, then device structure remains simple, but service life is reduced due to uneven exciton distribution
Solution Approach 1:
The patent modifies the charge carrier mobility parameters through doping the carrier balance material, achieving balanced electron and hole transport. This parameter optimization ensures uniform exciton recombination distribution across the light-emitting layer, preventing localized stress and degradation. Consequently, device reliability and service life are extended without increasing structural complexity
Solution Approach 2:
The carrier balance material acts as an intermediary substance that mediates between electrons and holes, facilitating balanced recombination. By introducing this intermediary component, the patent achieves uniform exciton distribution and improved device reliability while maintaining relatively simple device structure
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 balanced carrier distribution enhances light-emitting efficiency and extends the service life of OLED display devices by ensuring uniform exciton recombination across the light-emitting layer, thereby improving display performance.
Implementation Method 1
a material of the light-emitting layer includes a host light-emitting material and a carrier balance material doped in the host light-emitting material
Implementation Method 2
simultaneously evaporating a host light-emitting material and a carrier balance material by an evaporation process to form a light-emitting layer
Data Source
AI summary
The present disclosure provides an OLED display device, a display panel and a manufacturing method of the OLED display device, and belongs to the field of display technology. The OLED display device includes a light-emitting layer, a material of the light-emitting layer includes a host light-emitting material and a carrier balance material doped in the host light-emitting material; and the carrier balance material is used for balancing an electron mobility and a hole mobility of the light-emitting layer.