OLED Emissive Layer Composite Materials for Color Saturation
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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 high-quality displays, and there is a need for improved materials that can efficiently emit light with specific wavelengths.
Innovation Solution
The development of an organic light-emitting device (OLED) with a light emitting stack comprising a first electrode, a second electrode, and a layer selected from hole injecting, hole transporting, electron blocking, emissive, hole blocking, electron transporting, or electron injecting layers, where the layer consists of a mixture of compounds containing specific elements like D, F, CN, Si, Ge, P, B, and Se, allowing for enhanced color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional OLED materials are used, then device fabrication is simpler, but color saturation is insufficient
Solution Approach 1:
The patent employs composite materials by mixing two distinct organic compounds (first compound with element F1 and second compound with element S1) in the emissive layer. This composite approach enables the generation of saturated colors through the synergistic interaction of different molecular components, directly resolving the contradiction between color saturation and material simplicity.
Solution Approach 2:
The patent utilizes parameter changes by varying the elemental composition (F1 and S1 from groups D, F, CN, Si, Ge, P, B, Se) and their ratios in the mixed compound layer. By adjusting these chemical parameters, the emission wavelength and color saturation can be precisely tuned to achieve industry standards for saturated red, green, and blue pixels.
2Power
If single compound layers are used, then manufacturing is easier, but light emission efficiency is reduced
Solution Approach 1:
The emissive layer is constructed as a composite system containing first compound and second compound with different elemental compositions. This composite structure enhances light emission efficiency by leveraging the complementary properties of both compounds, including improved charge transport, exciton management, and radiative recombination, while maintaining a single-layer configuration.
3Illumination intensity
If mixed compounds with specific elements are used, then color emission quality is improved, but material synthesis complexity increases
Solution Approach 1:
The patent segments the emissive layer function into two distinct compound components (first compound with element F1 and second compound with element S1). Each component can be independently synthesized and optimized for specific functions, then mixed in controlled ratios to achieve desired emission properties. This segmentation simplifies the overall synthesis process compared to creating single complex molecules.
Solution Approach 2:
The patent employs parameter changes by systematically varying the elemental types (from groups D, F, CN, Si, Ge, P, B, Se) and their concentrations in the mixed compound system. This parametric approach allows for tunable emission wavelengths and colors while using well-established synthetic routes for individual compound classes, balancing emission quality with manufacturing feasibility.
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 configuration enables the OLED to produce high-quality, saturated colors by optimizing the energy levels and work functions of the compounds, leading to improved light emission characteristics and display performance.
Implementation Method 1
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 including a light emitting stack that includes: a first electrode; a second electrode; a first layer disposed between the first electrode and the second electrode. The first layer can be a hole injecting layer, a hole transporting layer, an electron blocking layer, an emissive layer, a hole blocking layer, an electron transporting layer, or an electron injecting layer. The first layer includes a first compound and a second compound mixed together. The first compound includes a first element (F1) that can be D, F, CN, Si, Ge, P, B, or Se. The second compound includes a first element (S1) that can be D, F, CN, Si, Ge, P, B, or Se. The first element of the first compound can be same or different from the first element (S1) of the second compound.