Light-Conversion Material Composition for Narrow Green Emission
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Solution Overview
Problem
Current light-emitting devices and display devices face limitations in improving gamut coverage due to the wide light-emitting spectrum of commonly used light-conversion materials, which restricts the narrow full width at half maximum (FWHM) and emission peak wavelength of emitted light.
Innovation Solution
A light-conversion material represented by the formula MmDdAaCcEeGg:Rr, where M, D, A, C, E, and G are specific elements, is developed to achieve a narrow FWHM by adjusting the proportions of these elements, allowing for a green light emission with a peak wavelength between 480 nm and 580 nm, and a FWHM that satisfies 2.5D50≤D10≤5.5D50, thereby enhancing color accuracy and gamut coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If commonly used light-conversion materials are used in LEDs, then the device structure is simple and easy to manufacture, but the light-emitting spectrum is wide which limits gamut coverage improvement
Solution Approach 1:
The patent applies parameter changes by systematically varying the molecular structure parameters of the light-conversion material, specifically the substituents R1-R6 on the xanthene core. By changing the chemical composition parameters (different combinations of H, F, Cl, Br, alkyl groups, aryl groups, heteroaryl groups, and their positions), the emission spectrum is narrowed while maintaining manufacturability through conventional organic synthesis methods.
Solution Approach 2:
The patent employs composite materials by creating complex xanthene derivatives that combine multiple functional groups and substituents within a single molecular framework. These composite molecular structures integrate electron-donating and electron-withdrawing groups, aromatic and aliphatic components, which work synergistically to achieve narrow FWHM while preserving ease of synthesis through established organic chemistry protocols.
2Measurement precision
If the light-conversion material is designed to emit green light with peak wavelength between 480 nm and 580 nm, then the color accuracy is improved, but the material structure becomes more complex
Solution Approach 1:
The patent applies local quality by introducing specific functional groups and substituents at particular positions (R1-R6) on the xanthene core structure. Each substituent location is optimized to contribute specifically to the emission wavelength and FWHM characteristics, allowing precise control over color accuracy while maintaining a relatively simple central xanthene framework that facilitates synthesis.
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 developed light-conversion material achieves a narrow FWHM and wave width, improving color accuracy and light-conversion efficiency, and is applicable in backlights for displays to enhance wide color gamut and reduce spectral loss through spectral tunability.
Implementation Method 1
The light-conversion material absorbs a portion of the excitation light to emit a green light
Data Source
AI summary
A light-conversion material and a light-emitting device and a display device including the same are provided. The light-conversion material is represented by formula (I): MmDdAaCcEeGg:Rr (I). Wherein M is Ca, Sr, or Ba; D is Zn, Cd, or a combination thereof; A is B, Al, or Ga; C is Si; E is O, S, or Se; G is N, P, As, Sb, or Bi; and R is Eu, Sm, or Yb. The formula (I) is satisfied by 0.5≤m≤2; 1≤d≤4; 0≤a≤2; 0.1≤c≤3.5; 0.1≤e≤4; 0.5≤g≤5.5; and 0.1≤r≤1.