Embedded Lumiphoric LED Chip Layers for Wavelength Conversion
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Solution Overview
Problem
Conventional LED packages face challenges in producing high-quality light with desired emission characteristics while maintaining high light emission efficiency, as they struggle to effectively convert and manage light within the LED chip structures.
Innovation Solution
Incorporating lumiphoric materials within the LED chips, specifically between active LED structures and internal reflective layers or electrical contacts, to convert light wavelengths before it exits, thereby reducing absorption and enhancing emission efficiency and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lumiphoric materials are embedded within LED chips, then color quality and emission efficiency are improved through wavelength conversion, but device complexity increases due to additional material layers and processing steps
Solution Approach 1:
The patent combines the lumiphoric material layer with existing LED chip structures by positioning it between the active LED structure and internal reflective layers or electrical contacts. This integration approach merges wavelength conversion functionality into the existing chip architecture rather than adding separate external components, thereby improving color quality and emission efficiency while minimizing the increase in device complexity.
Solution Approach 2:
The lumiphoric material layer serves multiple functions: it converts light wavelengths to improve color quality, enhances emission efficiency by reducing internal absorption, and can be positioned to work with different LED chip configurations (between active structure and reflective layers, or between active structure and electrical contacts). This multi-functionality allows a single component to address multiple performance requirements.
2Productivity
If lumiphoric materials are positioned between active LED structures and internal reflective layers, then light wavelength conversion occurs before light exits, improving emission efficiency, but manufacturing precision requirements increase
Solution Approach 1:
The lumiphoric material layer is positioned to perform wavelength conversion before light exits the LED chip, specifically between the active LED structure and internal reflective layers. This preliminary action ensures that light is converted to the desired wavelength while still within the chip structure, maximizing emission efficiency before light encounters potential absorption paths.
3Device complexity
If conventional LED packages are used, then device complexity is lower, but light emission efficiency and color quality are insufficient due to inadequate wavelength conversion
Solution Approach 1:
The lumiphoric material acts as an intermediary between the active LED structure and the external environment. It mediates the light conversion process by absorbing light from the active structure and re-emitting it at different wavelengths, thereby improving color quality and emission efficiency without requiring complete redesign of the LED package architecture.
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 embedded lumiphoric materials within the LED chips enable wavelength conversion of light, leading to improved color quality and efficiency by reducing internal absorption, allowing for broader emission spectra and enhanced brightness.
Implementation Method 1
the lumiphoric material layer configured to convert at least a portion of light generated by the active LED structure to a different wavelength
Implementation Method 2
Internally converted light propagating within LED chips may pass back through active LED structures with reduced light absorption
Data Source
AI summary
Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly arrangements of lumiphoric materials within LED chips are disclosed. Lumiphoric materials are incorporated or otherwise embedded within LED chips. Embedded lumiphoric materials are provided so that at least some portions of light generated by active LED structures are subject to wavelength conversion before exiting LED chip surfaces. Lumiphoric materials may form dielectric and/or passivation layers between various chip structures, such as between active LED structures and internal reflective layers and/or electrical contacts. Internally converted light propagating within LED chips may pass back through active LED structures with reduced light absorption.