White Sidewall Cell for Light Extraction Efficiency
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Solution Overview
Problem
Current light-emitting devices face inefficiencies in light extraction from the exit surface, limiting the brightness of the light source, despite using luminescent materials like phosphors or quantum dots.
Innovation Solution
A cell for a light-emitting device with a white sidewall, preferably made of white glass or ceramic, is designed to encapsulate a luminescent substance, enhancing light reflection and reducing leakage through the outer surface, thereby increasing the efficiency of light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional cell structure without white sidewall is used, then the device complexity is low, but the light extraction efficiency from the exit surface is insufficient
Solution Approach 1:
The sidewall of the cell is colored white to reflect light back into the internal space, increasing light extraction efficiency. The white color provides high reflectivity to redirect light that would otherwise be lost through the sidewall back toward the luminescent substance and exit surface.
Solution Approach 2:
The cell structure combines different materials with specific properties: the sidewall is made of white reflective material (such as white glass or ceramic coating) while the main walls and bottom may use transparent or light-transmitting materials. This composite approach optimizes both light reflection and transmission functions.
2Illumination intensity
If light is allowed to escape through the outer surface, then the light extraction is simple, but the light leakage reduces the brightness of the light source
Solution Approach 1:
Light that would normally be lost through the sidewall is converted into a beneficial effect by using the white sidewall to reflect this light back into the internal space. The potential energy loss is transformed into useful light that contributes to the overall brightness of the light source.
Solution Approach 2:
The white sidewall creates a feedback mechanism where light that escapes is reflected back toward the luminescent substance and exit surface. This feedback loop ensures that light energy is retained within the system and continuously directed toward the useful output path.
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 significantly enhances the efficiency of light extraction from the exit surface of the light-emitting device by reflecting light back into the cell, reducing leakage and increasing the brightness of the light source.
Implementation Method 1
A cell for a light-emitting device of the present invention includes a first main wall, a second main wall, and a sidewall... A portion of the sidewall located laterally of the internal space is white... The present invention can further increase the efficiency of light extraction from the light exit surface of the light-emitting device
Data Source
AI summary
The present invention can further increase the efficiency of light extraction from the light exit surface of a light-emitting device. A cell (10) for a light-emitting device includes: a first main wall (10a) and a second main wall (10b) which are disposed facing each other with a distance therebetween; and a sidewall (10c). The sidewall (10c) connects the first main wall (10a) and the second main wall (10b). The sidewall (10c) defines, together with the first and second main walls (10a, 10b), an internal space (10A) into which a luminescent substance is to be encapsulated. A portion of the sidewall (10c) located laterally of the internal space (10A) is white.