OLED Emissive Layer Sensitizer Acceptor Host Doping
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Solution Overview
Problem
Current OLED technologies face challenges in achieving saturated color emission, particularly in red, green, and blue pixels, which are essential for full-color displays, and in efficiently fabricating organic light-emitting devices with optimal performance and cost-effectiveness.
Innovation Solution
The development of an organic light-emitting device (OLED) comprising specific compounds as a sensitizer, acceptor, and host, where at least one of these compounds is doped into another, with precise chemical moieties and substituents, and a method for fabricating the device using a co-evaporation process in a high vacuum deposition tool, ensuring optimal energy transfer and emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional materials and methods are used for OLED fabrication, then production costs are reduced, but color accuracy and emission saturation are insufficient
Solution Approach 1:
The patent employs parameter changes by systematically varying the chemical structures of organic compounds (changing molecular parameters) to achieve saturated red, green, and blue emissions. Specific substituent groups and molecular configurations are optimized to tune emission wavelengths and improve color accuracy while maintaining compatibility with existing OLED fabrication processes
Solution Approach 2:
The invention uses composite organic materials comprising multiple compounds with specific functional groups and molecular structures. These composite organic emissive materials combine different chromophores and auxiliary compounds to achieve precise color control and high emission efficiency, resolving the contradiction between color accuracy and manufacturing simplicity
2Power
If specific organic compounds with precise chemical structures are used, then emission efficiency and luminance are improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by introducing specific functional groups and substituent patterns at particular positions within molecular structures. This localized chemical modification allows precise control over emission properties (color, efficiency, lifetime) without requiring complete redesign of the entire molecular architecture, thereby managing complexity while improving performance
Solution Approach 2:
The invention systematically adjusts molecular parameters such as conjugation length, substituent types, and molecular weight to optimize emission efficiency and luminance. By changing these chemical parameters in a controlled manner, the patent achieves high-performance emissions while maintaining reasonable structural complexity
3Adaptability or versatility
If organic materials are used instead of inorganic materials, then flexibility and cost are improved, but performance consistency varies
Solution Approach 1:
The patent uses composite organic materials with carefully selected components that work synergistically to improve performance consistency. The multi-component organic systems include emitters, hosts, and auxiliary compounds whose interactions are optimized to reduce variability and enhance reliability while preserving the inherent flexibility advantages of organic materials
Solution Approach 2:
The invention develops organic compounds with multiple functions embedded in their molecular structures. These universal organic materials can simultaneously provide charge transport, energy transfer, and emission functions, reducing the number of separate layers and materials needed, thereby improving both flexibility and performance consistency
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
This approach enables the production of OLEDs with improved color accuracy and efficiency, achieving high luminance and internal quantum efficiency, while reducing production costs through the use of cost-effective organic materials.
Implementation Method 1
the first compound is a sensitizer that transfers energy to the second compound; wherein the second compound is an acceptor that is an emitter
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided is an organic light emitting device (OLED) comprising: an anode; a hole transporting layer; an emissive region; an electron transporting layer; and a cathode; wherein the emissive region comprises: a first compound; a second compound; and a third compound; wherein the first compound is a sensitizer that transfers energy to the second compound; wherein the second compound is an acceptor that is an emitter; wherein the third compound is a first host, and at least one of the first compound and the second compound is doped in the third compound; wherein at least two of the first, second, and the third compounds comprises same or different substituent R*; wherein R* is selected from the group consisting of:moieties E and F, RE, and RF are defined herein. Also provided are related formulations, related premixed co-evaporation sources, related consumer products and related method of making those OLED devices.