Boron-Substituted Nitride Phosphor for White LED Efficiency
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Solution Overview
Problem
Current white LED light-emitting apparatuses require phosphors that efficiently convert blue light into yellow light for improved brightness and color rendering properties, but existing nitride phosphors are difficult to produce and have limited light emission spectrums, hindering the development of advanced white LED lighting solutions.
Innovation Solution
A phosphor compound represented by the formula MxCeySi6-zBzN8+w, where M is La, Y, or Lu, and w, x, y, and z satisfy specific ranges, is developed to enhance light emission properties by substituting silicon with boron, allowing for efficient excitation by blue light and emission in the green-to-yellow range, and a method for producing this phosphor involving pulverization, mixing, and burning in a reducing atmosphere is employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If nitride phosphors are used to improve light emission properties, then brightness and color rendering are enhanced, but production difficulty increases
Solution Approach 1:
The patent modifies the chemical composition parameters of the nitride phosphor by substituting silicon with boron (0 < z ≤ 6) and controlling the stoichiometry (MxCe0.05-0.5Si6-zBzN8+w), enabling the material to achieve high light emission intensity while becoming more amenable to production through established ceramic processing methods
Solution Approach 2:
The patent creates a composite nitride phosphor material combining multiple elements (M, Ce, Si, B, N) with specific compositional ratios, where the synergistic interaction between components achieves superior luminescence properties while maintaining manufacturability through controlled sintering processes
2Illumination intensity
If silicon is substituted with boron to improve light emission spectrum, then green-to-yellow emission is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges for boron substitution (0 < z ≤ 6) and overall composition (MxCe0.05-0.5Si6-zBzN8+w with 2.0 ≤ x < 5.0 and 0.95 ≤ w < 1.05), providing clear manufacturing targets that balance spectral performance with production feasibility
Solution Approach 2:
The patent applies local quality by strategically substituting only portion of silicon with boron (controlled by parameter z) rather than complete substitution, allowing optimization of the light emission spectrum in the green-to-yellow range while maintaining structural integrity and reducing manufacturing complexity
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 new phosphor improves light emission intensity and color rendering properties, enabling better light emission efficiency and color reproduction in white LED light-emitting apparatuses, with the ability to further enhance the light emission spectrum when used in conjunction with other phosphors.
Implementation Method 1
The first phosphor can absorb a part of the light from the excitation light source, and can emit luminescent radiation
Implementation Method 2
a crucible is filled with the obtained materials, and the obtained materials are burned in a reducing atmosphere
Data Source
AI summary
A phosphor is provided which is represented by the general formula MxCeySi6-zBzN8+w. M is at least one element selected from the group consisting of La, Y, Tb and Lu. And w, x, y, and z satisfy 2.0<w<4.0, 2.0<x<3.5, 0<y<1.0, and 0<z<2.0, respectively. The phosphor can be efficiently excited by light in a range from near-ultraviolet to blue light, and emit light having components that widely extend mainly from green range to yellow range. A light-emitting apparatus includes the phosphor together with a light-emitting device that emits light in a range from near-ultraviolet to blue light, and can have improved light emission efficiency, good color rendering property, and good color reproduction range. In the case where a light-emitting apparatus includes an additional phosphor, it is possible to further improve its light emission spectrum.