Organic Dye Formulation for High Color Purity Displays
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Solution Overview
Problem
Current color conversion materials for displays, such as quantum dots and organic dyes, face challenges in achieving narrow emission spectra and high extinction coefficients, leading to inefficiencies in color purity and increased production costs.
Innovation Solution
A formulation comprising an organic compound H, an emitter E, and an organic resin, where the emission spectrum of H is on the short wavelength side of the absorption spectrum of E, with a full width at half maximum (FWHM) of ≤55 nm, optimizing energy transfer and luminescence efficiency, and using specific structural units and solvents to enhance synthesis and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quantum dots are used as color conversion materials, then color purity can be achieved, but the extinction coefficient is low requiring thicker films which complicates mass production
Solution Approach 1:
The patent changes the material parameter from inorganic quantum dots to organic dyes with optimized molecular structures. The organic dyes exhibit high extinction coefficients (ε>10^5 L·mol⁻¹·cm⁻¹) enabling thin film formation, while maintaining narrow emission FWHM (≤55 nm) for high color purity. This parameter change resolves the contradiction between color purity and manufacturability.
Solution Approach 2:
The patent employs composite material strategies by combining organic dyes with specific host materials and encapsulants to create optimized color conversion layers. The composite structure leverages the high extinction coefficient of organic dyes while using host materials to enhance stability and processing, achieving both high color purity and ease of manufacture through solution processing techniques.
2Quantity of substance
If organic dyes are used as color conversion materials, then high extinction coefficient is achieved, but the emission spectrum FWHM is large (over 60 nm) reducing color purity
Solution Approach 1:
The patent applies local quality optimization by carefully designing the molecular structure of organic dyes with specific chromophores and auxochromes. This localized structural optimization enables the dye molecules to exhibit both high extinction coefficients and narrow emission FWHM, simultaneously achieving high concentration efficiency and high color purity that were previously contradictory.
Solution Approach 2:
The patent changes the optical parameters of organic dyes through molecular structure optimization, achieving emission FWHM≤55 nm while maintaining high extinction coefficients. This parameter optimization resolves the contradiction between quantity of substance (extinction coefficient) and measurement precision (color purity).
3Use of energy by moving object
If thick films are used to achieve complete absorption of blue light, then absorption efficiency is improved, but the production process complexity increases significantly
Solution Approach 1:
The patent changes the extinction coefficient parameter of the color conversion material from low (quantum dots) to high (organic dyes with ε>10^5 L·mol⁻¹·cm⁻¹). This parameter change enables complete absorption of blue light in thin films, eliminating the need for thick film structures and simplifying the production process while maintaining high absorption efficiency.
4Measurement precision
If vacuum evaporation with fine metal masks is used to fabricate RGB-OLED displays, then color display quality is achieved, but the fabrication complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical vacuum evaporation process with fine metal masks with a solution processing approach using organic dye materials. This substitution eliminates complex vacuum equipment and precise mask alignment requirements, enabling simpler and more cost-effective fabrication while maintaining high color display quality through the optimized optical properties of organic dyes.
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 formulation achieves high luminescence efficiency and narrow emission spectra, facilitating the production of high-efficiency color converters with thin thicknesses, meeting high color gamut requirements while reducing production costs.
Implementation Method 1
the emission spectrum of the organic compound H is on the short wavelength side of the absorption spectrum of the emitter E, and at least partially overlaps with the absorption spectrum of the emitter E
Data Source
AI summary
Disclosed are formulations including an organic compound H, an emitter E, and an organic resin. Also provided are organic functional films containing the formulations. Further provided are organic light-emitting devices containing the formulations.