Blue OLED Emitting Layer Composition for Longer Pixel Lifespan
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Solution Overview
Problem
The blue pixel in organic light emitting display devices does not provide sufficient emitting efficiency and lifespan, limiting the overall performance of the OLED.
Innovation Solution
Incorporating a first emitting material layer with a boron derivative dopant and a deuterated anthracene derivative host, along with electron and hole blocking layers, enhances the efficiency and lifespan of the OLED.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emitting material layers are used in blue OLEDs, then the device structure remains simple, but the emitting efficiency and lifespan are insufficient
Solution Approach 1:
The emitting layer is segmented into multiple functional sub-layers: a first emitting material layer containing boron derivative dopant and anthracene derivative host, and a second emitting material layer with different dopant and host materials. This segmentation allows each layer to be optimized for specific functions, improving overall reliability and lifespan while managing complexity through functional specialization.
Solution Approach 2:
The patent employs composite material systems by combining boron derivative dopants with anthracene derivative hosts in the first emitting material layer, and different dopant-host combinations in the second layer. These composite material systems enhance emitting efficiency and lifespan through synergistic effects between components, resolving the contradiction between improved reliability and increased material complexity.
2Productivity
If conventional emitting material layers are used in blue OLEDs, then the manufacturing process remains simple, but the emitting efficiency is insufficient
Solution Approach 1:
Different emitting material compositions are applied to different regions/layers of the OLED structure. The first emitting material layer uses boron derivative dopant with anthracene derivative host optimized for blue emission, while the second layer uses different materials optimized for other functions. This local quality differentiation improves emitting efficiency without requiring complete redesign of the entire manufacturing process.
Solution Approach 2:
The patent optimizes specific parameters of the emitting materials, including the chemical structure of boron derivative dopants, the deuterated anthracene derivative host structure, and the doping ratios. These parameter changes enhance emitting efficiency by improving exciton management and light emission characteristics, while the systematic approach to parameter optimization maintains manufacturing feasibility.
3Reliability
If blue OLEDs use standard emitting materials, then the overall device complexity is low, but the color sense and power consumption performance are limited
Solution Approach 1:
The patent creates composite emitting layer structures where boron derivative dopants are combined with deuterated anthracene derivative hosts. This composite material approach improves color sense by enabling better exciton confinement and radiative decay, achieving superior color performance while the systematic composition design manages the complexity of the emitting layer 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 solution significantly improves the emitting efficiency and lifespan of the OLED, particularly in blue pixels, thereby enhancing the performance of the organic light emitting display device.
Implementation Method 1
The OLED emits light by injecting electrons from a cathode as an electron injection electrode and holes from an anode as a hole injection electrode into an emitting material layer (EML), combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state
Data Source
AI summary
The present disclosure relates to an organic light emitting device that includes a substrate; and an organic light emitting diode positioned on the substrate and including a first electrode; a second electrode facing the first electrode; a first emitting material layer including a first dopant of a boron derivative and a first host of an anthracene derivative and positioned between the first and second electrodes; a first electron blocking layer including an electron blocking material and positioned between the first electrode and the first emitting material layer; and a first hole blocking layer including a hole blocking material and positioned between the second electrode and the first emitting material layer, wherein the first host is deuterated.