Phosphor Element Geometry for Uniform High-Intensity Fluorescence
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Solution Overview
Problem
Existing phosphor elements face challenges in maintaining high fluorescence intensity and uniform brightness as excitation light intensity increases over time, leading to unevenness in brightness and color.
Innovation Solution
The phosphor element design includes an incident face, an emitting face with a larger area, and a side face with a monotonously increasing inclination angle from the incident face to the emitting face, accompanied by a reflection film covering the side face, to enhance fluorescence intensity and reduce brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the intensity of excitation light is increased to improve fluorescence intensity, then the fluorescence intensity can be enhanced, but the unevenness of brightness and color occurs and the fluorescence intensity may be lowered over time
Solution Approach 1:
The phosphor element is designed with non-uniform thickness, where the thickness varies from the incident face to the emitting face. This creates local variations in phosphor concentration and light absorption, allowing different regions to compensate for each other and achieve overall uniformity in the emitted light, resolving the contradiction between high intensity and uniformity
Solution Approach 2:
The thickness distribution of the phosphor element is pre-designed and manufactured to anticipate and compensate for the non-uniform absorption and emission characteristics that occur during operation. By establishing the correct thickness profile before use, the system maintains uniform brightness without requiring active control or adjustment during operation
2Productivity
If the width of the phosphor is increased from incident face to emitting face to increase light flux, then the brightness can be increased, but the unevenness of brightness distribution occurs
Solution Approach 1:
The phosphor element employs spatially varying thickness, creating regions of different optical density. The thinner regions near the incident face allow more light to pass through, while thicker regions toward the emitting face compensate for light absorption, collectively producing uniform high-intensity output without brightness unevenness
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 design improves fluorescence intensity, particularly in the outer peripheral part of the emitting face, and suppresses brightness and color unevenness, resulting in more efficient and uniform light emission.
Implementation Method 1
the phosphor element converting at least a part of excitation light incident onto the incident face into a fluorescence and emitting the fluorescence from the emitting face
Implementation Method 2
a reflection film covering at least a part of said side face
Data Source
AI summary
A phosphor element includes an incident face for an excitation light, an emitting face opposing the incident face and a side face, and the element converts at least a part of the incident excitation light incident onto the incident face to fluorescence and emits the fluorescence from the emitting face. The emitting face has an area larger than an area of the incident face. The phosphor element comprises an inclination region in which an inclination angle of the side face with respect to a vertical axis perpendicular to the emitting face is monotonously increased from the incident face toward the emitting face, viewed in a cross-section perpendicular to the emitting face and along the longest dividing line halving the emitting face.