Lighting Device Phosphor Side Surface Reflective Layer
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Solution Overview
Problem
Current lighting devices with reflective coatings on encapsulants or frame members do not effectively utilize phosphor layers to enhance light emission directionality and prevent unnecessary light excitation, leading to inefficient light distribution and potential color inconsistencies.
Innovation Solution
A lighting device design featuring a light-emitting element with a phosphor layer on its peripheral side surface and a metallic light-reflecting layer on its upper surface, where the light-reflecting layer has a reflectivity of 50% or more, and is sloping or concave to match the surface geometry of the light-emitting element, ensuring uniform light emission and color conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective coating is arranged on an encapsulant or frame member, then light distribution is improved, but phosphor layer utilization for enhancing light emission directionality is insufficient
Solution Approach 1:
The patent applies phosphor layers not only on the upper surface but also on the peripheral side surface of the light-emitting element, transitioning from a single-plane configuration to a multi-dimensional configuration. This enables the phosphor layer to convert light at multiple surfaces, enhancing light emission directionality and utilizing the phosphor layer more effectively for controlled light distribution.
Solution Approach 2:
The patent applies different reflective properties to different regions: a reflective coating is applied to the inner surface of the encapsulant to reflect light upward, while phosphor layers are applied to specific surfaces (upper and peripheral) to convert light locally. This localized functional differentiation optimizes both light distribution and phosphor layer utilization.
2Ease of manufacture
If phosphor layers are applied to convert light, then color conversion is achieved, but unnecessary light excitation occurs leading to color inconsistencies
Solution Approach 1:
The patent applies phosphor layers selectively on specific surfaces (upper surface and peripheral side surface) rather than uniformly across all surfaces. This localized application ensures that light conversion occurs only where intended, preventing unnecessary excitation of phosphor materials in other regions and thereby maintaining color consistency.
Solution Approach 2:
The reflective coating acts as an intermediary element that redirects light in a controlled manner, ensuring that light reaches the phosphor layers in a predictable pattern. This mediation prevents scattered or unintended light excitation of the phosphor, contributing to consistent color output.
3Device complexity
If a simple reflective coating is used, then device complexity is reduced, but light directionality control is insufficient
Solution Approach 1:
The patent enhances light directionality control by applying phosphor layers on multiple surfaces (upper and peripheral side surfaces) of the light-emitting element. This multi-dimensional configuration enables precise control over light emission directions without requiring complex additional optical components, maintaining relative structural simplicity while improving directional control.
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 enhances light directionality and color consistency by uniformly converting light across the peripheral surface of the light-emitting element, reducing unnecessary light excitation and improving the appearance of the emitted light, whether it's ultraviolet, blue, or green.
Implementation Method 1
a phosphor layer directly covering a peripheral side surface of the light-emitting element
Implementation Method 2
a light-reflecting layer that is arranged in contact with an upper surface of the light-emitting element and arranged in contact with an upper surface of the phosphor layer
Data Source
AI summary
In a first aspect of the present inventive subject matter, a lighting device includes a light-emitting element that includes a first electrode and a second electrode on a lower surface of the light-emitting element; a phosphor layer directly covering a peripheral side surface of the light-emitting element; and a light-reflecting layer that is in contact with an upper surface of the light-emitting element and in contact with an upper surface of the phosphor layer directly covering the peripheral side surface of the light-emitting element.