Transparent Edging for Phosphor Layer Protection in LED Lighting
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Solution Overview
Problem
Existing optoelectronic lighting devices are susceptible to environmental influences such as humidity and oxygen, which can damage moisture-sensitive and surface-coated phosphors, leading to efficiency issues and surface roughness during the manufacturing process.
Innovation Solution
The optoelectronic lighting device incorporates a transparent edging surrounding a functional layer, which protects it from environmental influences by forming a border that keeps the functional layer inside and allows light to pass through, while the edging is designed to be formed from materials like silicone or glass, and a cover layer can be reflective to enhance light conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the functional layer is exposed to the environment, then the manufacturing process is simpler, but the phosphor is damaged by moisture and oxygen leading to efficiency loss and surface roughness
Solution Approach 1:
The patent applies a transparent encapsulation layer (thin film) over the functional layer containing phosphor. This encapsulation layer acts as a protective barrier that prevents moisture and oxygen from reaching the phosphor, thereby maintaining phosphor stability and preventing efficiency loss and surface roughness, while still allowing the manufacturing process to remain relatively simple.
2Reliability
If the functional layer is completely surrounded by edging, then protection from environmental influences is improved, but light extraction efficiency may be reduced
Solution Approach 1:
The patent implements edging with different transparency properties in different regions. The edging is transparent in areas where light extraction is needed and opaque or reflective in areas where protection is prioritized. This local differentiation allows the system to simultaneously achieve good environmental protection and maintain high light extraction efficiency where required.
Solution Approach 2:
The patent introduces a transparent encapsulation layer as an intermediary between the functional layer and the external environment. This intermediary layer provides protection against moisture and oxygen while maintaining optical transparency, thus allowing light to pass through without significant loss while still providing the needed environmental protection.
3Reliability
If the edging is made opaque for better protection, then environmental protection is improved, but light transmission is reduced
Solution Approach 1:
The edging structure is designed with spatially varying optical properties - transparent portions where light transmission is needed and opaque portions where environmental protection is prioritized. This allows the system to simultaneously achieve both protection and light transmission without compromising either function significantly.
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 design protects the functional layer from environmental damage, maintains efficiency, and prevents mechanical damage during cutting processes, ensuring a compact and efficient lighting device with improved light extraction and reduced aging problems.
Implementation Method 1
a conversion layer for converting light emerging from the emission area into light with at least one other wavelength
Implementation Method 2
the edging is formed of a transparent material
Data Source
AI summary
In an embodiment an optoelectronic lighting device includes a carrier, exactly one light-emitting optoelectronic semiconductor component, wherein the semiconductor component has a light emission area on at least one surface side, and wherein the semiconductor component is arranged on an upper side of the carrier, at least one functional layer arranged above the light emission area and/or adjacent to the light emission area and an edging for the functional layer, wherein the edging surrounds the functional layer when viewed in a circumferential direction, the circumferential direction being parallel to the upper side of the carrier around the functional layer, and wherein the edging is formed of a transparent material.