Glass Ceramic Packaging for High-Power LED Thermal Management
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Solution Overview
Problem
Traditional semiconductor light sources packaged with organic materials fail to handle high temperatures generated by high-power semiconductor light sources, limiting their brightness and luminescence efficiency.
Innovation Solution
A glass ceramic with a composition of (1−x)A: xB, where A is a precursor glass with Sb2O3, B2O3, ZnO, and M2O, combined with YAG:Ce3+ fluorescent powder, is used to create a high-temperature resistant and efficient light-conversion packaging material for high-power white light sources, involving a preparation method including high-temperature melting, cooling, grinding, and annealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional organic packaging materials (silicone) are used for semiconductor light sources, then the packaging can be easily manufactured, but the materials cannot endure high temperatures generated by high-power semiconductor light sources
Solution Approach 1:
The patent uses a composite material consisting of glass ceramic matrix combined with YAG:Ce3+ fluorescent powder particles. This composite structure provides both high temperature resistance from the glass ceramic and fluorescent conversion capability from the YAG:Ce3+ powder, resolving the contradiction between temperature endurance and functional performance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the glass ceramic by adjusting the ratios of PbO, B2O3, SiO2, and other oxides to achieve optimal melting temperature, viscosity, and thermal stability. This allows the material to withstand high temperatures while maintaining manufacturability through controlled composition parameters.
2Illumination intensity
If high-power semiconductor light sources are used to achieve higher lumen and brightness, then illumination performance is improved, but the generated heat exceeds the capability of traditional packaging materials
Solution Approach 1:
The glass ceramic acts as an intermediary material between the high-power semiconductor light source and the external environment. It absorbs and manages the heat generated by the light source while simultaneously converting blue light to yellow light through YAG:Ce3+ fluorescent powder, enabling high illumination output without thermal damage to packaging components.
3Productivity
If glass ceramic with adjustable refractive index and high transmittance is used, then light conversion efficiency is improved, but the material requires precise composition control and advanced manufacturing processes
Solution Approach 1:
The patent optimizes the chemical composition parameters of the glass ceramic, specifically controlling the ratios of PbO (30-70 wt%), B2O3 (10-40 wt%), SiO2 (5-20 wt%), and other components, to achieve the desired refractive index and transmittance properties. This systematic parameter control enables high light conversion efficiency while maintaining manufacturability.
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 glass ceramic achieves high light-conversion efficiency, excellent luminescence properties, and suitable for large-scale industrial production, with applications in high-power white light illumination and display, such as vehicle headlights and projectors.
Implementation Method 1
B is a YAG:Ce3+ fluorescent powder
Implementation Method 2
with luminescence properties of the YAG:Ce3+ fluorescent powder remaining unaffected
Implementation Method 3
glass has advantages such as high thermal conductivity
Implementation Method 4
adjustable refractive index
Data Source
AI summary
The present invention discloses a glass ceramic for excitation of high-power semiconductor light source. An expression of constitution of the glass ceramic is (1−x)A: xB, wherein x as a weight percentage of B, is ranging from 1% to 30%; A as a precursor glass, has a composition of aSb2O3-bB2O3-cZnO-dM2O, a, b, c, d being molar percentages, a+b+c+d=100%, M among M2O represents an alkali metal, and M2O is an alkali metallic oxide or an alkali metallic carbonate; and B is a YAG:Ce3+ fluorescent powder. The precursor glass provided by the present invention has a relatively low remelting temperature, without devitrification during the process of preparing the final products or absorption of blue light. The product glass ceramic has a luminous efficiency of 300 lm/W to 400 lm/W. A white light semiconductor light source is prepared by the product glass ceramic in combination with the high-power blue light semiconductor light source. A preparation method provided by the present invention has advantages such as low cost, excellent performances, and being green, pollution-free and suitable for the large-scale industrial production. The present invention can be applied in the field of illumination light source and display light source, such as head-lights of vehicles, searchlights, projectors and laser cinemas.