Lanthanide OLED Emissive Region for Saturated Color Emission
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Solution Overview
Problem
Conventional OLEDs face challenges in achieving saturated red, green, and blue pixel emissions required by industry standards, particularly in terms of color accuracy and efficiency, especially when using organic materials.
Innovation Solution
Incorporation of a compound A1, which is a coordination compound comprising a lanthanide metal, and an organometallic complex S1 as a sensitizer, within the emissive region of the OLED, facilitating energy transfer and improved color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic materials are used in OLEDs, then cost and flexibility advantages are achieved, but color accuracy and efficiency for saturated red, green, and blue pixels deteriorate
Solution Approach 1:
The patent employs composite emissive materials comprising host materials and guest materials (including phosphorescent and thermally activated delayed fluorescent materials) to achieve both the flexibility/cost advantages of organic materials and the color accuracy requirements for saturated red, green, and blue pixels
Solution Approach 2:
The patent utilizes thermally activated delayed fluorescent materials with specific photophysical parameters (delayed fluorescence lifetime, energy levels) to enable precise color control and improve color accuracy while maintaining organic material advantages
2Device complexity
If conventional emissive materials are used, then device simplicity is maintained, but energy transfer efficiency and color saturation deteriorate
Solution Approach 1:
The patent introduces thermally activated delayed fluorescent materials as intermediary emissive species that receive energy from host materials and transfer it to guest materials, enabling efficient energy transfer chains that improve color saturation and reduce energy loss while maintaining reasonable device structure
Solution Approach 2:
The patent exploits the delayed fluorescence characteristic of TADF materials, which exhibit periodic emission behavior with extended lifetimes, to improve energy utilization efficiency and enhance color saturation through controlled energy release
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
Enhances the ability of OLEDs to produce saturated colors by optimizing energy transfer, thereby meeting industry standards for color accuracy and efficiency.
Implementation Method 1
compound A1 and an organometallic complex S1, where compound A1 is a coordination compound comprising a lanthanide metal
Implementation Method 2
emissive region comprises a compound A1 and an organometallic complex S1... Enhances the ability of OLEDs to produce saturated colors by optimizing energy transfer
Data Source
AI summary
An organic light emitting device (OLED) is provided that includes an anode; a cathode; and an emissive region, disposed between the anode and the cathode. The emissive region comprises a compound A1 and an organometallic complex S1, wherein compound A1 is a coordination compound comprising a lanthanide metal. Consumer products containing the OLED are also provided.