Organometallic OLED Emitters for Saturated Color and White Light
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Solution Overview
Problem
Existing organic light-emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue pixel emissions required for full color displays, and conventional methods for white light emission often require complex stack structures or absorption filters.
Innovation Solution
Development of organometallic compounds with specific structures, such as Formula I, which can be used in OLEDs to enhance emission properties, allowing for direct production of saturated colors or white light without the need for additional filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional white OLED structures with absorption filters are used, then white light emission is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the absorption filter layer from the conventional white OLED stack structure. By using a phosphorescent emitter that directly emits saturated red light, the complex multi-layer filter structure is removed, simplifying the device while maintaining the required color emission capability.
Solution Approach 2:
The patent changes the emission parameter of the phosphorescent emitter to achieve saturated red light emission directly. By selecting appropriate phosphorescent materials and their emission characteristics, the device produces the required saturated colors without needing optical filters to modify the emission spectrum.
2Illumination intensity
If conventional white OLED structures with absorption filters are used, then white light emission is achieved, but manufacturing cost and process difficulty increase
Solution Approach 1:
The patent removes the absorption filter layer from the manufacturing process, reducing the number of fabrication steps. This extraction of the filter layer directly simplifies the manufacturing process and reduces costs while maintaining the ability to produce saturated red emission.
Solution Approach 2:
The patent employs phosphorescent materials with specific emission parameters that directly provide saturated red light. This eliminates the need for post-emission filtering, simplifying the manufacturing process and reducing the complexity of achieving the desired color output.
3Adaptability or versatility
If saturated red, green, and blue pixel emissions are achieved using conventional methods, then full color display requirements are met, but device structure becomes complex
Solution Approach 1:
The patent uses phosphorescent emitters with specifically tuned emission parameters to directly produce saturated red, green, and blue light. By selecting appropriate phosphorescent materials for each pixel type, the device achieves full color display capability without requiring complex multi-layer filter structures for each pixel.
Solution Approach 2:
The patent employs a universal phosphorescent emitter design that can be used across different pixel types (red, green, blue) by simply changing the phosphorescent material. This multi-functional approach simplifies the overall device structure compared to having specialized emitter-filter combinations for each color.
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 organometallic compounds enable efficient and direct production of saturated colors or white light in OLEDs, improving display performance and simplifying manufacturing processes.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound having a structure of Formula I,is provided. In Formula I, two of Z1, Z2, Z3, and Z4 are C and the other two are N; each of X1 to X16 is independently C or N; each of L1 and L2 is independently a direct bond or a linker; one of L1 and L2 is present; M is Pd or Pt; each RA, RB, RC, and RD is independently hydrogen or a substitutent selected from the General Substituent; and any two of RA, RB, RC, and RD can be joined or fused together to form a ring. Formulations, OLEDs, and consumer products including the compound of Formula I are also disclosed.