Copper Ion-Doped Glass for Polychromatic LED Emission
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Solution Overview
Problem
Existing fluorescent glass materials exhibit monochromatic photoluminescence, primarily blue emission, limiting their application scenarios and leading to decreased luminous efficiency and shorter service life in LED devices due to high junction temperatures.
Innovation Solution
A copper ion-doped polychromatic fluorescent glass is developed with a specific chemical composition (aP2O5-bSiO2-cZnO-dCs2CO3-eNaCl-fCuCl) that provides an ultrastrong coordination environment for cuprous ions, enabling blue, orange, and near-infrared emissions through component adjustment, with a preparation process involving melting and annealing under a reducing atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fluorescent glass with cuprous ions is used, then blue photoluminescence is achieved, but only monochromatic emission limits application scenarios
Solution Approach 1:
The patent changes the chemical composition parameters of the glass matrix by introducing specific metal ions (Mn2+, Ni2+, Co2+) alongside Cu+ ions, and adjusts their concentrations to transform the emission characteristics from monochromatic blue to polychromatic including blue, orange, and near-infrared bands, thereby expanding application scenarios
Solution Approach 2:
The patent creates a composite fluorescent glass material containing multiple dopant ions (Cu+, Mn2+, Ni2+, Co2+) within a glass matrix, where each ion contributes different emission characteristics, achieving polychromatic emission that combines blue, orange, and near-infrared wavelengths for enhanced versatility
2Power
If high input current is used to improve luminous efficiency, then LED performance is enhanced, but junction temperature increases causing aging and shorter service life
Solution Approach 1:
The patent modifies the thermal properties of the LED package by replacing epoxy resin with fluorescent glass having superior thermal conductivity, and adjusts the glass composition to optimize heat dissipation characteristics, thereby reducing junction temperature under high power operation while maintaining luminous efficiency
Solution Approach 2:
The patent replaces the conventional epoxy resin package with fluorescent glass, which although more complex in composition, provides significantly enhanced thermal management properties that extend service life under high power conditions, effectively making the package material a long-term solution rather than a short-lived component
3Ease of manufacture
If fluorescent powder and epoxy resin package are used, then LED assembly is simple, but heat resistance and chemical stability are insufficient
Solution Approach 1:
The patent replaces the two-component system (fluorescent powder + epoxy resin) with a single integrated fluorescent glass material that combines the fluorescent functionality with the package material, maintaining manufacturing simplicity while dramatically improving heat resistance and chemical stability through the glass matrix structure
Solution Approach 2:
The patent merges the fluorescent powder and package material into a single fluorescent glass component, where the glass matrix simultaneously provides structural support, thermal management, and fluorescent emission, eliminating the need for separate epoxy resin packaging while enhancing overall reliability
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 copper ion-doped polychromatic fluorescent glass achieves high quantum yields for blue, orange, and near-infrared emissions, enhancing thermal conductivity and chemical stability, suitable for LED devices and applications like single host white-light illumination, near-infrared venography, and infrared night-vision scope.
Implementation Method 1
the fluorescent glass is subjected to a further red shift so as to achieve wide emission of three wave bands, i.e. blue, orange and near-infrared photoluminescence, under the excitation of UV light
Implementation Method 2
by adding P2O5, SiO2, ZnO, Cs2CO3 and NaCl, the cuprous ions are allowed to obtain an ultrastrong coordination environment
Implementation Method 3
the fluorescent glass not only has a luminous property same as the fluorescent powder, but also has the advantages of glass substrates such as heat resistance, corrosion resistance, high thermal conductivity
Data Source
AI summary
A copper ion-doped polychromatic fluorescent glass and a preparation method and use thereof are provided. The fluorescent glass has a chemical formula shown as the following: aP2O5-bSiO2-cZnO-dCs2CO3-eNaCl-fCuCl, wherein a, b, c, d, e, and f in the formula represent the molar coefficients of compounds, wherein a is 45 to 65, b is 10 to 30, c is 1 to 5, d is 5 to 20, e is 5 to 20, f is 0.1 to 5. The fluorescent can achieve blue, orange and near-infrared photoluminescence under the UV light with higher fluorescent quantum yield.