Phosphor Device Warping Suppression Layer
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Solution Overview
Problem
Existing phosphor devices face issues with non-uniform bonding and reduced fluorescence intensity due to warping and internal stress caused by thermal expansion coefficient differences between the phosphor layer and reflective films, leading to bubble formation and efficiency deterioration.
Innovation Solution
Incorporating a warping suppression layer between the reflective film and the supporting body to mitigate warping and internal stress, ensuring uniform direct bonding and enhancing fluorescence intensity by using a ferroelectric multi-layered film or metal film with a warping suppression layer to manage thermal expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reflective film is directly bonded to a supporting body, then bonding strength is improved, but non-uniform bonding occurs due to thermal expansion coefficient differences causing warping and bubble generation
Solution Approach 1:
A warping suppression layer is introduced as an intermediary component between the reflective film and the supporting body. This intermediate layer has a thermal expansion coefficient that is smaller than that of the reflective film, which suppresses warping during thermal processes and enables uniform bonding across the entire bonding surface, preventing bubble generation while maintaining strong bonding
2Device complexity
If a reflective film is directly bonded to a supporting body, then device complexity is reduced, but internal stress increases leading to reduced fluorescence intensity
Solution Approach 1:
The warping suppression layer acts as a stress-management intermediary that reduces internal stress generated during thermal expansion and contraction. By suppressing warping and providing a stable bonding interface, this intermediate layer protects the phosphor layer from stress-induced degradation, thereby maintaining high fluorescence intensity and conversion efficiency
3Manufacturing precision
If a warping suppression layer is added between the reflective film and supporting body, then bonding uniformity is improved, but device complexity increases
Solution Approach 1:
The warping suppression layer is designed with specific material parameters, particularly a thermal expansion coefficient that is smaller than that of the reflective film. By carefully selecting materials with appropriate thermal expansion coefficients, the layer effectively suppresses warping during thermal processes, enabling uniform bonding without requiring complex bonding procedures or additional processing steps
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 solution effectively suppresses bubble formation and maintains high conversion efficiency, improving the uniformity and intensity of fluorescence emission in phosphor devices.
Implementation Method 1
an excitation light incident onto the phosphor layer is converted to a fluorescence
Implementation Method 2
the fluorescence and excitation light are reflected by the reflective film and emitted from the phosphor layer
Data Source
AI summary
A phosphor device includes a phosphor layer composed of a phosphor glass or phosphor single crystal, a reflective film provided on the phosphor layer, a warping suppression layer provided on the reflective film, and a supporting body bonded to the warping suppression layer by direct bonding. An excitation light incident into the phosphor layer is converted to fluorescence, and the fluorescence and excitation light are reflected by the reflective film and emitted from the phosphor layer.