Zeolitic Phosphor Synthesis for White LED Autonomy
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Solution Overview
Problem
Current white LED technologies rely on phosphor powders with limited luminescence properties and are dependent on proprietary materials, necessitating the development of novel phosphors with zeolitic structures that can emit yellow, blue, or white light efficiently.
Innovation Solution
A phosphor with a zeolitic structure, specifically synthesized using a hydrothermal method with a chemical formula (A)5-x/2[M9-xGaxO(HPO4)(PO4)8].yH2O, where M is a transition metal and A is a Group 1A metal or protonated organic amine, capable of emitting yellow, blue, or white light when excited by UV or blue light within specific wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional phosphor powders (YAG, RGB phosphors) are used in white LED, then current white LED techniques can be implemented, but the phosphor materials are proprietary and controlled by foreign companies (Japan and U.S.), creating dependency and limiting development autonomy
Solution Approach 1:
The invention changes the chemical composition parameters by using domestic raw materials (zinc oxide, gallium oxide, phosphoric acid) to synthesize phosphor powders with specific molecular ratios, creating a new material system that is not dependent on foreign proprietary phosphors while maintaining the required luminescence properties for white LED applications
Solution Approach 2:
The invention creates a composite phosphor material system combining zinc oxide, gallium oxide, and phosphoric acid in specific proportions, forming a new composite phosphor powder that achieves the desired luminescence characteristics while being produced from domestically available raw materials, thus resolving both autonomy and supply security concerns
2Illumination intensity
If multiple phosphor powders (RGB phosphors) are used to produce white light, then the white light quality can be improved, but the deterioration rates of various phosphor powders are not uniform, affecting the quality of resultant white light
Solution Approach 1:
The invention merges the functions of multiple phosphor materials into a single phosphor powder formulation containing zinc oxide, gallium oxide, and phosphoric acid. This unified phosphor material exhibits uniform luminescence characteristics and stable deterioration rate, eliminating the compatibility and stability issues that arise from using multiple different phosphor powders together
Solution Approach 2:
The invention creates a universal phosphor material that can be excited by both UV and blue LED light sources to produce white light with consistent quality. This single phosphor formulation serves multiple functions (replacing RGB phosphors, providing stable luminescence, ensuring uniform deterioration) that were previously required from multiple different phosphor materials
3Productivity
If yellow phosphor powder (YAG) is used with blue LED, then white light can be produced efficiently, but the phosphor powder is proprietary and owned by foreign companies, limiting technological independence
Solution Approach 1:
The invention changes the chemical composition parameters by replacing proprietary YAG phosphor with a domestically synthesizable phosphor powder composed of zinc oxide, gallium oxide, and phosphoric acid in specific ratios, maintaining the ability to produce white light efficiently while achieving technological independence
Solution Approach 2:
The invention uses inexpensive, readily available raw materials (zinc oxide, gallium oxide, phosphoric acid) to produce phosphor powder that can be synthesized domestically without relying on expensive proprietary foreign phosphors, making the technology economically viable and independently sustainable
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 synthesized phosphor achieves efficient light emission with tunable colors, including yellow, blue, and white, offering a potential replacement for traditional lighting solutions with improved longevity and reduced mercury pollution.
Implementation Method 1
A method for emitting light, comprising exciting the phosphor of the present invention by a light from UV light to blue light having a wavelength between 270 to 500 nm, to emit yellow light, blue light, or white light
Data Source
AI summary
The present invention is related to a phosphor that can be excited by UV light between 375 to 400 nm to emit white light, which is intrinsically produced by emitting blue light with yellow light simultaneously. This compound is synthesized from organic amine, metal oxide and phosphate under hydrothermal conditions, and gives rise to a zeolitic structure with the chemical formula of (A)5-x/2[Zn9-xGaxO(HPO4)(PO4)8].yH2O (0<x<9, 0<y<15). On the other hand, when synthesized by different solvents, it is possible to obtain a phosphor of the same chemical formula and structure, but it can emit yellow light when excited by UV light or blue light emitted by LED between 300 to 500 nm.