UV Light Emitting Device Package With Inorganic Paste And Ceramic Body
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Solution Overview
Problem
Conventional light emitting device packages face issues with moisture or air penetration, which reduces optical and electrical properties, and organic matter in paste layers reacts with UV light, causing discoloration and reduced coupling force, while also experiencing suboptimal light distribution due to the geometry of the lens.
Innovation Solution
The use of a light emitting device package with a ceramic package body, an inorganic paste layer, and an anti-reflection coating layer formed of inorganic materials, along with a lens design that includes a surface with at least one inflection point to improve light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional package body with organic paste layer is used, then the device can be manufactured with standard processes, but the organic matter reacts with UV light causing discoloration and reduced coupling force
Solution Approach 1:
The paste layer material is changed from organic composition to inorganic composition (e.g., metal oxide, metal nitride, or metal carbide). This fundamental material parameter change eliminates the chemical reactivity with UV light that causes discoloration and coupling force degradation in organic paste layers.
Solution Approach 2:
The package employs a composite structure where an inorganic paste layer is used in conjunction with the light-emitting device. This composite approach combines the electrical connectivity function of the paste layer with UV resistance, eliminating the harmful chemical reactions while maintaining device performance.
2Illumination intensity
If a conventional lens geometry is used, then the manufacturing is simpler, but the light distribution and view angle are suboptimal
Solution Approach 1:
The lens surface is designed with curved geometries including at least one inflection point, transitioning from simple spherical or aspherical surfaces to more complex curved profiles. This curvature design optimizes light ray paths to achieve superior light distribution and expanded view angles compared to conventional simple lens geometries.
Solution Approach 2:
The lens design incorporates inflection points that introduce additional geometric complexity in multiple dimensions. This multi-dimensional geometric optimization allows for improved control over light propagation in various directions, enhancing both light distribution uniformity and view angle without requiring additional optical components.
3Reliability
If the package body does not have moisture barrier properties, then the manufacturing process is simpler, but moisture and air penetrate and reduce optical and electrical properties
Solution Approach 1:
The package body is constructed using composite ceramic materials that inherently provide moisture and air barrier properties. The ceramic composition creates a hermetic seal that prevents penetration of moisture and air, protecting the light-emitting device from environmental degradation while maintaining electrical and optical performance.
Solution Approach 2:
The ceramic package body creates an inert, hermetic environment that isolates the light-emitting device from external moisture and air. This inert barrier prevents chemical reactions and property degradation, ensuring long-term reliability of both optical and electrical characteristics.
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
Prevents moisture and air from affecting the light emitting device's properties, prevents UV-induced discoloration and coupling force reduction in the inorganic paste layers, and enhances the view angle and distribution of emitted light.
Implementation Method 1
an anti-reflection (AR) coating layer disposed around the light emitting device
Implementation Method 2
the inorganic paste layer does not react with UV, deep UV, or near UV, thereby the inorganic paste layer may not be discolored
Implementation Method 3
a package body including at least one ceramic layer... prevents moisture and air from penetrating the light emitting device package
Implementation Method 4
a lens disposed at an uppermost end of the package body, wherein the lens has a surface with at least one inflection point
Data Source
AI summary
A light emitting device package is disclosed. The light emitting device package includes a package body including at least one ceramic layer, a submount disposed at the package body, a light emitting device disposed on the submount for emitting ultraviolet (UV)-wavelength light, and an anti-reflection (AR) coating layer disposed around the light emitting device, the AR coating layer being formed of an inorganic coating layer.