Blue OLED Emitting Layer With Deuterated Host-Dopant Materials
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Solution Overview
Problem
The blue pixel in OLEDs of organic light emitting display devices suffers from insufficient emitting efficiency and lifespan, limiting the overall performance of these devices.
Innovation Solution
Incorporating a first emitting material layer with an anthracene derivative and a pyrene derivative, both partially or fully deuterated, and an electron blocking layer with a spirofluorene-substituted amine derivative, along with a hole blocking layer using azine and benzimidazole derivatives, enhances the efficiency and lifespan of the OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emitting materials are used in blue pixel OLEDs, then the device can be manufactured with standard materials, but the emitting efficiency and lifespan are insufficient
Solution Approach 1:
The patent deuterates the anthracene derivative host material by replacing hydrogen atoms with deuterium atoms. This isotopic substitution changes the physical and chemical parameters of the material, specifically improving the lifespan and emitting efficiency of the blue OLED without fundamentally changing the manufacturing process or material structure
Solution Approach 2:
The patent creates a composite emitting material system combining deuterated anthracene derivative host with pyrene derivative dopant. This composite approach synergistically improves emitting efficiency and lifespan while maintaining compatibility with existing OLED manufacturing processes
2Productivity
If conventional emitting materials are used in blue pixel OLEDs, then the device structure can be kept simple, but the emitting efficiency is insufficient
Solution Approach 1:
Deuteration of the anthracene derivative host material changes the vibrational modes and energy levels of the emitting system, thereby improving emitting efficiency. The deuterated host material (Formula 1) with deuterium atoms at specific positions enhances the photophysical properties without requiring complex device architecture
Solution Approach 2:
The patent introduces deuterium atoms at specific local positions within the anthracene derivative molecular structure. This localized isotopic substitution optimizes the emitting properties at the molecular level, improving overall emitting efficiency without complicating the entire 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 deuterated anthracene and pyrene derivatives, combined with specific electron and hole blocking materials, significantly improve the emitting efficiency and lifespan of the OLEDs while minimizing production costs.
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; a first emitting material layer including a first host being an anthracene derivative and a first dopant being a pyrene derivative and positioned between the first and second electrodes; and a first electron blocking layer including an electron blocking material of a spirofluorene-substituted amine derivative and positioned between the first electrode and the first emitting material layer, wherein at least one of hydrogen atoms in the anthracene derivative and the pyrene derivative is deuterated.