Concave Reflecting Mirror for Uniform Light Distribution
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Solution Overview
Problem
Existing light-emitting devices face challenges in miniaturization due to the need for a thick transparent substrate between the surface-emitting laser and the phosphor, which affects the uniformity of light intensity distribution and makes it difficult to achieve a compact, bright, and stable color output.
Innovation Solution
A light-emitting device configuration featuring a concave-shaped first reflecting mirror and a phosphor layer positioned between the first reflecting mirror and a second reflecting layer, allowing light to enter the phosphor at a wide radiation angle, thereby improving the uniformity of light intensity distribution without the need for a thick substrate, and utilizing a reflecting layer with a Bragg mirror to optimize light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a thick transparent substrate is provided between the surface-emitting laser and the phosphor, then the light intensity distribution uniformity is improved, but the device size increases and miniaturization becomes difficult
Solution Approach 1:
The patent employs a concave-shaped first reflecting mirror instead of a flat substrate. The curved reflective surface focuses and distributes light more uniformly across the phosphor layer, achieving homogeneous light intensity without requiring a thick transparent substrate. This curvature-based solution resolves the contradiction by maintaining uniformity while reducing overall device volume.
Solution Approach 2:
The patent introduces a reflecting mirror as an intermediary component between the laser and phosphor. This mediator redirects and distributes light effectively, eliminating the need for a thick transparent substrate that would otherwise be required for uniform light distribution. The intermediary enables miniaturization while preserving composition stability.
2Stability of the object's composition
If the phosphor layer is placed far away from the first reflecting mirror, then the light intensity distribution uniformity improves, but the device size increases
Solution Approach 1:
The concave shape of the first reflecting mirror is specifically designed to focus and distribute light uniformly at a shorter distance. The curved geometry concentrates light rays onto the phosphor layer more effectively than a flat surface would, achieving uniform intensity distribution while keeping the phosphor layer close to the mirror for compactness.
Solution Approach 2:
The patent optimizes the curvature radius and depth of the concave reflecting mirror to achieve the desired light distribution uniformity at a reduced distance. By adjusting these geometric parameters, the system achieves effective light-phosphor interaction without requiring the phosphor layer to be positioned far from the mirror, thus maintaining compact device dimensions.
3Stability of the object's composition
If the first reflecting mirror is made concave-shaped, then the light radiation angle increases and uniformity improves, but the manufacturing complexity increases
Solution Approach 1:
The patent integrates the concave-shaped first reflecting mirror directly into the semiconductor substrate structure. By combining the substrate and reflecting mirror into a single integrated component, the manufacturing process is simplified despite the curved geometry. This merging approach eliminates the need for separate mirror fabrication and assembly steps, reducing overall manufacturing complexity while maintaining the optical benefits of the concave shape.
Solution Approach 2:
The first reflecting mirror serves multiple functions: it reflects light, focuses the light distribution, and acts as part of the semiconductor device structure. This multi-functionality reduces the need for additional separate components, simplifying the overall manufacturing process while achieving the desired light radiation characteristics and uniformity.
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
This configuration enables miniaturization while maintaining a bright and stable color output, with improved uniformity of light intensity distribution and effective heat dissipation, allowing for a compact white light-emitting device.
Implementation Method 1
The phosphor layer performs wavelength conversion on light leaking from the vertical resonator
Implementation Method 2
light leaking from the first reflecting mirror is spread by the concave-shaped first reflecting mirror
Implementation Method 3
the light leaking from the first reflecting mirror is obliquely reflected by the first reflecting layer
Data Source
AI summary
A light-emitting device according to an embodiment of the present disclosure includes a laminate. The laminate includes an active layer, a first semiconductor layer, and a second semiconductor layer. The first semiconductor layer and the second semiconductor layer sandwich the active layer in between. The light-emitting device further includes a current confining layer, a concave-shaped first reflecting mirror provided on side of the first semiconductor layer, and a second reflecting mirror provided on side of the second semiconductor layer. The current confining layer has an opening. The first reflecting mirror and the second reflecting mirror sandwich the laminate and the opening in between. The light-emitting device further includes a first reflecting layer and a phosphor layer. The first reflecting layer is disposed at a position opposed to the first reflecting mirror with a predetermined gap in between. The phosphor layer is disposed between the first reflecting mirror and the first reflecting layer, and performs wavelength conversion on light leaking from the first reflecting mirror.