Aluminum Silicate Protective Layer for Wavelength Converting Materials
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Solution Overview
Problem
Wavelength converting materials used in light-emitting diodes are susceptible to damage by oxygen and moisture, leading to a decrease in luminescence brightness and lifetime.
Innovation Solution
A wavelength converting material is developed with a protective layer made of aluminum silicate, where silicon atoms are configured in specific bonding states with aluminum oxide groups, providing enhanced resistance to oxygen and moisture, and the luminous core can be modified with quantum dots or phosphor powders coated with organic or inorganic materials for further protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wavelength converting materials are used in light-emitting diodes, then luminescence brightness and color conversion are achieved, but the materials are susceptible to destruction by oxygen and moisture causing decreased luminescence brightness and lifetime
Solution Approach 1:
The patent introduces an aluminum silicate protective layer as an intermediary between the wavelength converting material and the external environment. This protective layer specifically blocks oxygen and moisture from reaching the luminous core, while allowing the material to maintain its luminescence function. The aluminum silicate composition with specific silicon atom configurations (Q4(3Al) and Q4(4Al)) provides effective barrier properties against harmful substances.
Solution Approach 2:
The patent employs a composite structure consisting of a luminous core (quantum dots or phosphors) combined with an aluminum silicate protective layer. This composite material approach integrates the luminescence function of the core material with the protective barrier function of the aluminum silicate layer, creating a material system that simultaneously achieves light conversion and environmental protection.
2Reliability
If a protective layer is added to protect the luminous core, then resistance to oxygen and moisture is improved, but the structural complexity increases
Solution Approach 1:
The patent optimizes the chemical composition parameters of the aluminum silicate protective layer, specifically controlling the ratio of different silicon atom configurations (Q4(0Al), Q4(1Al), Q4(2Al), Q4(3Al), Q4(4Al)). By adjusting these compositional parameters to have a higher proportion of Q4(3Al) and Q4(4Al) configurations, the protective layer achieves superior barrier properties against oxygen and moisture without requiring complex multi-layer structures.
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 protective layer significantly improves the luminescence lifetime and reliability of the wavelength converting material by preventing damage from external substances, maintaining high luminescence intensity and color uniformity over time.
Implementation Method 1
the first protective layer protecting the luminous core from damage by external substances such as oxygen and moisture
Implementation Method 2
quantum dots and phosphors are common wavelength converting materials that can be applied to light-emitting diodes to absorb light from a light-emitting diode chip and emit light of other colors
Data Source
AI summary
A wavelength converting material includes a luminous core and a first protective layer. The first protective layer covers the luminous core, and the first protective layer includes aluminum silicate. The aluminum silicate includes a plurality of silicon atoms, each of the silicon atoms is one of a zeroth configuration Q4(0Al), first configuration Q4(1Al), second configuration Q4(2Al), third configuration Q4(3Al), and fourth configuration Q4(4Al). The silicon atoms of the zeroth configuration do not connect with aluminum oxide group, and the silicon atoms of the first, second, third, and fourth configurations respectively connect with one, two, three, and four aluminum oxide group(s). A total number of the silicon atoms of the third configuration and the fourth configuration is larger than a total number of the silicon atoms of the zeroth configuration, the first configuration, and the second configuration.