NASICON Phosphor for High Thermal Stability White LEDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional blue phosphors used in near-UV LEDs suffer from poor thermal stability and low light emission efficiency, making them unsuitable for high-quality white LED applications, and are restricted by existing patents.
Innovation Solution
Development of a phosphor with a novel NASICON structure, specifically a phosphor substance with the chemical formula A1+xSc2-yC3X12:AEy, where A, B, C, and D are specific elements, and AE is an optically active element, which exhibits high thermal stability and efficient light emission, maintaining luminous intensity under excitation sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional blue phosphors are used in near-UV LEDs, then the structure is simple and manufacturing cost is reduced, but thermal stability is poor and light emission efficiency is low
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific NASICON structure with formula A1+xSc2-yC3X12:AEy, where A is monovalent metal, B is trivalent metal, C is tetravalent metal, D is pentavalent metal, and AE is optically active element. This compositional parameter change achieves both high thermal stability and high light emission efficiency while maintaining manufacturability through conventional ceramic processing techniques.
Solution Approach 2:
The patent employs a composite phosphor material combining multiple elements (monovalent metal A, trivalent metal B, tetravalent metal C, pentavalent metal D, and optically active element AE) in a NASICON crystal structure. This composite approach achieves superior thermal stability and light emission efficiency compared to conventional single-component blue phosphors, while the material can be synthesized using standard ceramic processing methods.
2Ease of manufacture
If conventional blue phosphors are used in near-UV LEDs, then manufacturing cost is reduced, but light emission efficiency is low
Solution Approach 1:
The patent optimizes the compositional parameters within the NASICON structure (controlling x, y ratios and selecting specific elements for A, B, C, D, and AE positions) to achieve high light emission efficiency. The optically active element AE (such as Eu3+, Tb3+, Ce3+) is strategically selected to maximize luminescence output while the overall composition maintains compatibility with conventional manufacturing processes and cost structures.
Solution Approach 2:
The patent adopts the proven NASICON crystal structure framework (already known from ionic conductor research by Collin et al.) and adapts it for phosphor applications by incorporating optically active elements. This approach leverages existing structural knowledge and processing methods while achieving superior optoelectronic performance, avoiding the need to develop entirely new material systems.
3Reliability
If a novel phosphor composition is developed to improve thermal stability, then thermal stability is improved, but the composition becomes more complex
Solution Approach 1:
The patent achieves high thermal stability through controlled compositional parameters within the NASICON structure, where the stoichiometry (A1+xSc2-yC3X12:AEy) and element selection are optimized. Despite the multi-element composition, the synthesis follows conventional ceramic processing steps (mixing, calcination, sintering), and the crystal structure provides inherent thermal stability. The complexity is managed by maintaining a systematic compositional framework rather than using disordered multi-component systems.
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 excellent thermal stability and high light emission efficiency, enabling the production of white LEDs with improved color rendering index and durability, suitable for various display and lighting applications.
Implementation Method 1
Globally known phosphor receive energy from an excitation source having high energy, such as vacuum ultraviolet rays, ultraviolet rays, electron beams, near-ultraviolet rays, and blue rays, and emit visible rays
Data Source
AI summary
A phosphor of a chemically stable inorganic luminescent material having a NASICON structure and an application product including the phosphor, such as a light-emitting device. A phosphor having the formula of A1+xBxC2−xD3X12:AEy where A is one or two types of elements of monovalent metal cations, B is one or two types of elements of trivalent cations, C is one or two types of elements of tetravalent cations, D is one or two types of elements of pentavalent cations, X is one or two types of elements of N, O, F, P, S, O, Cl, and Br, AE is one or two types of elements of Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Th, U, and Bi, 0≤x≤2, and 0≤y≤0.1.