Blue OLED Emitting Layer Composition for Efficiency and Lifespan
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Solution Overview
Problem
The blue pixel in OLEDs does not provide sufficient emitting efficiency and lifespan, limiting the overall performance of organic light emitting display devices.
Innovation Solution
Incorporating a first host of an anthracene derivative and a second host of a deuterated anthracene derivative in the emitting material layer, with a weight % ratio of 1:9 to 9:1, in a single or tandem structure OLED design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emitting materials are used in blue pixel OLEDs, then device structure and operation are simple, but emitting efficiency and lifespan are insufficient
Solution Approach 1:
The patent employs a composite emitting material layer containing both an anthracene derivative host and a deuterated anthracene derivative host in specific weight ratios (1:9 to 9:1). This composite material system resolves the contradiction by combining materials with complementary properties: the anthracene derivative provides good electroluminescence characteristics while the deuterated variant enhances stability and lifespan, achieving both reliability improvement and controlled complexity
Solution Approach 2:
The patent applies parameter changes by modifying the host material composition through deuterium substitution and optimizing the weight ratio between the two hosts. By adjusting these parameters (deuterium content, weight ratio), the emitting efficiency and lifespan are enhanced without fundamentally changing the device structure, thus improving reliability while maintaining manageable complexity
2Productivity
If conventional emitting materials are used in blue pixel OLEDs, then material composition is simple, but emitting efficiency is insufficient
Solution Approach 1:
The composite emitting material layer combines anthracene derivative and deuterated anthracene derivative hosts with a blue dopant in optimized ratios. This composite system resolves the contradiction by leveraging the synergistic effects of different materials: the anthracene derivative ensures high emitting efficiency while the deuterated component provides stability, achieving improved productivity without excessive complexity
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different components within the emitting material layer. The anthracene derivative host primarily contributes to electroluminescence generation, while the deuterated anthracene derivative host enhances operational stability. This functional differentiation optimizes emitting efficiency locally within each material component
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
Improves the emitting efficiency and lifespan of the OLED and the organic light emitting device, enabling high color purity and narrow full width at half maximum in blue emission.
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 OLED that includes a first electrode; a second electrode facing the first electrode; and a first emitting material layer including a first host, a second host and a first blue dopant and positioned between the first and second electrodes, wherein the first host is an anthracene derivative, and the second host is a deuterated anthracene derivative.