AlON Phosphor Composition for Wide Color Gamut Displays
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Solution Overview
Problem
Current phosphors used in light-emitting instruments and image display devices, particularly those based on AlON crystals, face limitations in blue light excitation characteristics and emission intensity, which restrict the expansion of color gamut and color reproducibility, especially for green light emission.
Innovation Solution
A phosphor composition with a specific range of Mn, Li, Mg, F, and other elements within an AlON crystal structure is developed, optimizing blue light excitation and emission efficiency to produce high-intensity green light with improved color purity, suitable for a wide color gamut in light-emitting instruments and image display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Mn is added to AlON crystal to achieve high color purity green emission, then color purity is improved, but blue light excitation characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of Mn (0.003-0.09 atomic ratio) and introducing co-dopants (Li: 0.005-0.025, Mg: 0.001-0.09) to optimize the crystal structure. This adjusts the energy levels and electronic transitions in the AlON crystal, enabling simultaneous achievement of high color purity green emission and improved blue light excitation characteristics through modified compositional parameters
Solution Approach 2:
The patent creates a composite doped AlON crystal system by combining multiple elements (Al, O, N, Mn, Li, Mg, F) in specific ratios. This composite structure leverages the synergistic effects where Mn provides green emission, Li and Mg enhance blue light absorption, and F stabilizes the crystal structure, thereby resolving the contradiction between color purity and excitation characteristics
2Use of energy by moving object
If Mg is added to improve blue light excitation characteristics, then excitation characteristics are improved, but emission intensity requires further improvement
Solution Approach 1:
The patent optimizes the concentration parameters of Mg (0.001-0.09) in combination with Mn (0.003-0.09) and Li (0.005-0.025) to achieve balanced performance. By adjusting these compositional parameters, the crystal structure is tuned to simultaneously improve blue light absorption efficiency and maintain high green emission intensity, resolving the trade-off between excitation characteristics and emission power
3Adaptability or versatility
If conventional phosphors are used in light-emitting instruments, then basic function is achieved, but color gamut expansion and color reproducibility are restricted
Solution Approach 1:
The patent develops a composite AlON crystal phosphor doped with Mn, Li, Mg, and F elements that achieves both high emission intensity and superior color gamut. The composite structure enables sharp green emission spectrum with high color purity while maintaining strong blue light absorption, thereby expanding color gamut and improving color reproducibility in light-emitting instruments and display devices
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 phosphor achieves enhanced blue light excitation characteristics and high emission intensity, resulting in a wider color gamut and improved color reproducibility, particularly for green light, making it suitable for applications in liquid crystal displays and other image display technologies.
Implementation Method 1
the phosphor emits green light with high color purity having a peak from 510 to 520 nm and a narrow half width of the spectrum when it is excited by an ultraviolet ray, blue light, or an electron beam
Data Source
AI summary
Provided are a light-emitting instrument, and an image display device utilizing an AlON phosphor and having wide color gamut. The light-emitting instrument includes an emission source emitting light having a wavelength from 410 nm to 470 nm and a phosphor or a light-transmitting body where the phosphor is dispersed, and the phosphor includes an inorganic compound where an AlON crystal, an AlON solid solution crystal, or an inorganic crystal having a crystal structure identical to AlON includes at least Mn, an A element (a monovalent metal element) it necessary, a D element (a divalent metal element) if necessary, an E element (a monovalent anion) if necessary, and a G element (one or more elements other than Mn, the A, Al, O, N, the D, or the E) if necessary, and emits fluorescence having a peak wavelength from 515 nm to 541 nm upon irradiation of an excitation source.